Calculator display changes

calculatorpp-core/src/main/java/org/solovyev/android/calculator/Calculator.java

@@ -1,9 +1,25 @@
 package org.solovyev.android.calculator;
 
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+import org.solovyev.common.msg.MessageRegistry;
+
 /**
  * User: Solovyev_S
  * Date: 20.09.12
  * Time: 16:38
  */
 public interface Calculator extends CalculatorEventContainer {
+
+    @NotNull
+    CalculatorEventDataId createFirstEventDataId();
+
+    void evaluate(@NotNull JsclOperation operation,
+                  @NotNull String expression);
+
+    @NotNull
+    CalculatorEventDataId evaluate(@NotNull JsclOperation operation,
+                                   @NotNull String expression,
+                                   @Nullable MessageRegistry mr);
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorDisplay.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ * or visit http://se.solovyev.org
+ */
+
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * User: serso
+ * Date: 12/17/11
+ * Time: 9:45 PM
+ */
+public interface CalculatorDisplay extends CalculatorEventListener {
+
+    void setView(@Nullable CalculatorDisplayView view);
+
+    @NotNull
+    CalculatorDisplayViewState getViewState();
+
+    void setViewState(@NotNull CalculatorDisplayViewState viewState);
+
+    @NotNull
+    CalculatorEventData getLastEventData();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorDisplayImpl.java

@@ -0,0 +1,147 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import static org.solovyev.android.calculator.CalculatorEventType.*;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 8:24 PM
+ */
+public class CalculatorDisplayImpl implements CalculatorDisplay {
+
+    @NotNull
+    private CalculatorEventData lastCalculatorEventData = CalculatorEventDataImpl.newInstance(CalculatorLocatorImpl.getInstance().getCalculator().createFirstEventDataId());
+
+    @Nullable
+    private CalculatorDisplayView view;
+
+    @NotNull
+    private final Object viewLock = new Object();
+
+    @NotNull
+    private CalculatorDisplayViewState lastViewState = CalculatorDisplayViewStateImpl.newDefaultInstance();
+
+    @Override
+    public void setView(@Nullable CalculatorDisplayView view) {
+        synchronized (viewLock) {
+            this.view = view;
+
+            if (view != null) {
+                this.view.setState(lastViewState);
+            }
+        }
+    }
+
+    @NotNull
+    @Override
+    public CalculatorDisplayViewState getViewState() {
+        return this.lastViewState;
+    }
+
+    @Override
+    public void setViewState(@NotNull CalculatorDisplayViewState viewState) {
+        synchronized (viewLock) {
+            this.lastViewState = viewState;
+            if (this.view != null) {
+                this.view.setState(viewState);
+            }
+        }
+    }
+
+/*    @Override
+    @Nullable
+    public CharSequence getText() {
+        synchronized (viewLock) {
+            return view != null ? view.getText() : null;
+        }
+    }
+
+    @Override
+    public void setText(@Nullable CharSequence text) {
+        synchronized (viewLock) {
+            if (view != null) {
+                view.setText(text);
+            }
+        }
+    }
+
+    @Override
+    public int getSelection() {
+        synchronized (viewLock) {
+            return view != null ? view.getSelection() : 0;
+        }
+    }
+
+    @Override
+    public void setSelection(int selection) {
+        synchronized (viewLock) {
+            if (view != null) {
+                view.setSelection(selection);
+            }
+        }
+    }*/
+
+    @Override
+    @NotNull
+    public CalculatorEventData getLastEventData() {
+        return lastCalculatorEventData;
+    }
+
+    @Override
+    public void onCalculatorEvent(@NotNull CalculatorEventData calculatorEventData,
+                                  @NotNull CalculatorEventType calculatorEventType,
+                                  @Nullable Object data) {
+        if (calculatorEventType.isOfType(calculation_result, calculation_failed, calculation_cancelled)) {
+
+            if (calculatorEventData.isAfter(lastCalculatorEventData)) {
+                lastCalculatorEventData = calculatorEventData;
+            }
+
+            switch (calculatorEventType) {
+                case calculation_result:
+                    processCalculationResult((CalculatorEvaluationEventData)calculatorEventData, (CalculatorOutput) data);
+                    break;
+                case calculation_cancelled:
+                    processCalculationCancelled((CalculatorEvaluationEventData)calculatorEventData);
+                    break;
+                case calculation_failed:
+                    processCalculationFailed((CalculatorEvaluationEventData)calculatorEventData, (CalculatorFailure) data);
+                    break;
+            }
+
+        }
+    }
+
+    private void processCalculationFailed(@NotNull CalculatorEvaluationEventData calculatorEventData, @NotNull CalculatorFailure data) {
+
+        final CalculatorEvalException calculatorEvalException = data.getCalculationEvalException();
+
+        final String errorMessage;
+        if (calculatorEvalException != null) {
+            errorMessage = CalculatorMessages.getBundle().getString(CalculatorMessages.syntax_error);
+        } else {
+            final CalculatorParseException calculationParseException = data.getCalculationParseException();
+            if (calculationParseException != null) {
+                errorMessage = calculationParseException.getLocalizedMessage();
+            } else {
+                errorMessage = CalculatorMessages.getBundle().getString(CalculatorMessages.syntax_error);
+            }
+        }
+
+        this.setViewState(CalculatorDisplayViewStateImpl.newErrorState(calculatorEventData.getOperation(), errorMessage));
+    }
+
+    private void processCalculationCancelled(@NotNull CalculatorEvaluationEventData calculatorEventData) {
+        final String errorMessage = CalculatorMessages.getBundle().getString(CalculatorMessages.syntax_error);
+
+        this.setViewState(CalculatorDisplayViewStateImpl.newErrorState(calculatorEventData.getOperation(), errorMessage));
+    }
+
+    private void processCalculationResult(@NotNull CalculatorEvaluationEventData calculatorEventData, @NotNull CalculatorOutput data) {
+        final String stringResult = data.getStringResult();
+        this.setViewState(CalculatorDisplayViewStateImpl.newValidState(calculatorEventData.getOperation(), data.getResult(), stringResult, 0));
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorDisplayView.java

@@ -0,0 +1,16 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 8:25 PM
+ */
+public interface CalculatorDisplayView {
+
+    void setState(@NotNull CalculatorDisplayViewState state);
+
+    @NotNull
+    CalculatorDisplayViewState getState();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorDisplayViewState.java

@@ -0,0 +1,33 @@
+package org.solovyev.android.calculator;
+
+import jscl.math.Generic;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 9:50 PM
+ */
+public interface CalculatorDisplayViewState {
+
+    @NotNull
+    String getText();
+
+    int getSelection();
+
+    @Nullable
+    Generic getResult();
+
+    boolean isValid();
+
+    @Nullable
+    String getErrorMessage();
+
+    @NotNull
+    JsclOperation getOperation();
+
+    @Nullable
+    String getStringResult();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorDisplayViewStateImpl.java

@@ -0,0 +1,104 @@
+package org.solovyev.android.calculator;
+
+import jscl.math.Generic;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+import org.solovyev.common.text.StringUtils;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 9:50 PM
+ */
+public class CalculatorDisplayViewStateImpl implements CalculatorDisplayViewState {
+
+    @NotNull
+    private JsclOperation operation = JsclOperation.numeric;
+
+    @Nullable
+    private Generic result;
+
+    @Nullable
+    private String stringResult = "";
+
+    private boolean valid = true;
+
+    @Nullable
+    private String errorMessage;
+
+    private int selection = 0;
+
+    private CalculatorDisplayViewStateImpl() {
+    }
+
+    @NotNull
+    public static CalculatorDisplayViewState newDefaultInstance() {
+        return new CalculatorDisplayViewStateImpl();
+    }
+
+    @NotNull
+    public static CalculatorDisplayViewState newErrorState(@NotNull JsclOperation operation,
+                                                           @NotNull String errorMessage) {
+        final CalculatorDisplayViewStateImpl calculatorDisplayState = new CalculatorDisplayViewStateImpl();
+        calculatorDisplayState.valid = false;
+        calculatorDisplayState.errorMessage = errorMessage;
+        calculatorDisplayState.operation = operation;
+        return calculatorDisplayState;
+    }
+
+    @NotNull
+    public static CalculatorDisplayViewState newValidState(@NotNull JsclOperation operation,
+                                                           @Nullable Generic result,
+                                                           @NotNull String stringResult,
+                                                           int selection) {
+        final CalculatorDisplayViewStateImpl calculatorDisplayState = new CalculatorDisplayViewStateImpl();
+        calculatorDisplayState.valid = true;
+        calculatorDisplayState.result = result;
+        calculatorDisplayState.stringResult = stringResult;
+        calculatorDisplayState.operation = operation;
+        calculatorDisplayState.selection = selection;
+
+        return calculatorDisplayState;
+    }
+
+    @NotNull
+    @Override
+    public String getText() {
+        return StringUtils.getNotEmpty(isValid() ? stringResult : errorMessage, "");
+    }
+
+    @Override
+    public int getSelection() {
+        return selection;
+    }
+
+    @Nullable
+    @Override
+    public Generic getResult() {
+        return this.result;
+    }
+
+    @Override
+    public boolean isValid() {
+        return this.valid;
+    }
+
+    @Nullable
+    @Override
+    public String getErrorMessage() {
+        return this.errorMessage;
+    }
+
+    @Override
+    @Nullable
+    public String getStringResult() {
+        return stringResult;
+    }
+
+    @NotNull
+    @Override
+    public JsclOperation getOperation() {
+        return this.operation;
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEvaluationEventData.java

@@ -0,0 +1,18 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 10:00 PM
+ */
+public interface CalculatorEvaluationEventData extends CalculatorEventData{
+
+    @NotNull
+    JsclOperation getOperation();
+
+    @NotNull
+    String getExpression();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEvaluationEventDataImpl.java

@@ -0,0 +1,58 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 10:01 PM
+ */
+public class CalculatorEvaluationEventDataImpl implements CalculatorEvaluationEventData {
+
+    @NotNull
+    private final CalculatorEventData calculatorEventData;
+
+    @NotNull
+    private final JsclOperation operation;
+
+    @NotNull
+    private final String expression;
+
+    public CalculatorEvaluationEventDataImpl(@NotNull CalculatorEventData calculatorEventData,
+                                             @NotNull JsclOperation operation,
+                                             @NotNull String expression) {
+        this.calculatorEventData = calculatorEventData;
+        this.operation = operation;
+        this.expression = expression;
+    }
+
+    @NotNull
+    @Override
+    public JsclOperation getOperation() {
+        return this.operation;
+    }
+
+    @NotNull
+    @Override
+    public String getExpression() {
+        return this.expression;
+    }
+
+    @Override
+    public long getEventId() {
+        return calculatorEventData.getEventId();
+    }
+
+    @Override
+    @Nullable
+    public Long getCalculationId() {
+        return calculatorEventData.getCalculationId();
+    }
+
+    @Override
+    public boolean isAfter(@NotNull CalculatorEventDataId calculatorEventDataId) {
+        return calculatorEventData.isAfter(calculatorEventDataId);
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEventData.java

@@ -1,11 +1,10 @@
 package org.solovyev.android.calculator;
 
-import org.jetbrains.annotations.Nullable;
-
 /**
  * User: Solovyev_S
  * Date: 20.09.12
  * Time: 16:51
  */
 public interface CalculatorEventData extends CalculatorEventDataId {
+
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEventDataId.java

@@ -1,5 +1,6 @@
 package org.solovyev.android.calculator;
 
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 /**
@@ -14,4 +15,6 @@ public interface CalculatorEventDataId {
 
     @Nullable
     Long getCalculationId();
+
+    boolean isAfter(@NotNull CalculatorEventDataId calculatorEventDataId);
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEventDataIdImpl.java

@@ -8,7 +8,7 @@ import org.jetbrains.annotations.Nullable;
  * Date: 20.09.12
  * Time: 18:18
  */
-public class CalculatorEventDataIdImpl implements CalculatorEventDataId {
+class CalculatorEventDataIdImpl implements CalculatorEventDataId {
 
     private final long eventId;
 
@@ -22,7 +22,7 @@ public class CalculatorEventDataIdImpl implements CalculatorEventDataId {
     }
 
     @NotNull
-    public static CalculatorEventDataId newInstance(long id,
+    static CalculatorEventDataId newInstance(long id,
                                                     @Nullable Long calculationId) {
         return new CalculatorEventDataIdImpl(id, calculationId);
     }
@@ -38,6 +38,11 @@ public class CalculatorEventDataIdImpl implements CalculatorEventDataId {
         return this.calculationId;
     }
 
+    @Override
+    public boolean isAfter(@NotNull CalculatorEventDataId calculatorEventDataId) {
+        return this.eventId > calculatorEventDataId.getEventId();
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEventDataImpl.java

@@ -13,10 +13,15 @@ class CalculatorEventDataImpl implements CalculatorEventData {
     @NotNull
     private CalculatorEventDataId calculatorEventDataId;
 
-    CalculatorEventDataImpl(@NotNull CalculatorEventDataId calculatorEventDataId) {
+    private CalculatorEventDataImpl(@NotNull CalculatorEventDataId calculatorEventDataId) {
         this.calculatorEventDataId = calculatorEventDataId;
     }
 
+    @NotNull
+    public static CalculatorEventData newInstance(@NotNull CalculatorEventDataId calculatorEventDataId) {
+        return new CalculatorEventDataImpl(calculatorEventDataId);
+    }
+
     @Override
     public long getEventId() {
         return calculatorEventDataId.getEventId();
@@ -28,6 +33,11 @@ class CalculatorEventDataImpl implements CalculatorEventData {
         return calculatorEventDataId.getCalculationId();
     }
 
+    @Override
+    public boolean isAfter(@NotNull CalculatorEventDataId calculatorEventDataId) {
+        return this.calculatorEventDataId.isAfter(calculatorEventDataId);
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEventType.java

@@ -1,9 +1,43 @@
 package org.solovyev.android.calculator;
 
+import org.jetbrains.annotations.NotNull;
+
 /**
  * User: Solovyev_S
  * Date: 20.09.12
  * Time: 16:40
  */
 public enum CalculatorEventType {
+
+    /*
+    **********************************************************************
+    *
+    * org.solovyev.android.calculator.CalculatorEvaluationEventData
+    *
+    **********************************************************************
+    */
+
+    // @NotNull org.solovyev.android.calculator.CalculatorInput
+    calculation_started,
+
+    // @NotNull org.solovyev.android.calculator.CalculatorOutput
+    calculation_result,
+
+    calculation_cancelled,
+
+    calculation_finished,
+
+    // @NotNull org.solovyev.android.calculator.CalculatorFailure
+    calculation_failed;
+
+    public boolean isOfType(@NotNull CalculatorEventType... types) {
+        for (CalculatorEventType type : types) {
+            if ( this == type ) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorFailure.java

@@ -0,0 +1,21 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 7:33 PM
+ */
+public interface CalculatorFailure {
+
+    @NotNull
+    Exception getException();
+
+    @Nullable
+    CalculatorParseException getCalculationParseException();
+
+    @Nullable
+    CalculatorEvalException getCalculationEvalException();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorFailureImpl.java

@@ -0,0 +1,34 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 7:34 PM
+ */
+public class CalculatorFailureImpl implements CalculatorFailure {
+
+    @NotNull
+    private Exception exception;
+
+    public CalculatorFailureImpl(@NotNull Exception exception) {
+        this.exception = exception;
+    }
+
+    @NotNull
+    @Override
+    public Exception getException() {
+        return this.exception;
+    }
+
+    @Override
+    public CalculatorParseException getCalculationParseException() {
+        return exception instanceof CalculatorParseException ? (CalculatorParseException)exception : null;
+    }
+
+    @Override
+    public CalculatorEvalException getCalculationEvalException() {
+        return exception instanceof CalculatorEvalException ? (CalculatorEvalException)exception : null;
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorImpl.java

@@ -9,9 +9,11 @@ import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.text.TextProcessor;
 import org.solovyev.common.msg.MessageRegistry;
+import org.solovyev.common.msg.MessageType;
 
 import java.util.List;
-import java.util.concurrent.*;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 import java.util.concurrent.atomic.AtomicLong;
 
 /**
@@ -21,14 +23,13 @@ import java.util.concurrent.atomic.AtomicLong;
  */
 public class CalculatorImpl implements Calculator {
 
+    private static final long FIRST_ID = 0;
+
     @NotNull
     private final CalculatorEventContainer calculatorEventContainer = new ListCalculatorEventContainer();
 
     @NotNull
-    private static final Calculator instance = new CalculatorImpl();
+    private final AtomicLong counter = new AtomicLong(FIRST_ID);
-
-    @NotNull
-    private final AtomicLong counter = new AtomicLong(0);
 
     @NotNull
     private final Object lock = new Object();
@@ -39,12 +40,7 @@ public class CalculatorImpl implements Calculator {
     @NotNull
     private final Executor threadPoolExecutor = Executors.newFixedThreadPool(10);
 
-    private CalculatorImpl() {
+    public CalculatorImpl() {
-    }
-
-    @NotNull
-    public static Calculator getInstance() {
-        return instance;
     }
 
     @NotNull
@@ -53,6 +49,12 @@ public class CalculatorImpl implements Calculator {
         return CalculatorEventDataIdImpl.newInstance(eventId, eventId);
     }
 
+    @NotNull
+    private CalculatorEventDataId nextEventDataId(@NotNull Long calculationId) {
+        long eventId = counter.incrementAndGet();
+        return CalculatorEventDataIdImpl.newInstance(eventId, calculationId);
+    }
+
     /*
     **********************************************************************
     *
@@ -61,12 +63,21 @@ public class CalculatorImpl implements Calculator {
     **********************************************************************
     */
 
+    @NotNull
+    @Override
+    public CalculatorEventDataId createFirstEventDataId() {
+        return CalculatorEventDataIdImpl.newInstance(FIRST_ID, FIRST_ID);
+    }
+
+    @Override
     public void evaluate(@NotNull JsclOperation operation,
                          @NotNull String expression) {
         evaluate(operation, expression, null);
     }
 
-    public void evaluate(@NotNull final JsclOperation operation,
+    @Override
+    @NotNull
+    public CalculatorEventDataId evaluate(@NotNull final JsclOperation operation,
                                           @NotNull final String expression,
                                           @Nullable final MessageRegistry mr) {
 
@@ -75,67 +86,97 @@ public class CalculatorImpl implements Calculator {
         threadPoolExecutor.execute(new Runnable() {
             @Override
             public void run() {
-                CalculatorImpl.this.evaluate(eventDataId, operation, expression, mr);
+                CalculatorImpl.this.evaluate(eventDataId.getCalculationId(), operation, expression, mr);
             }
         });
+
+        return eventDataId;
     }
 
-    private void evaluate(@NotNull CalculatorEventDataId eventDataId,
+    private void evaluate(@NotNull Long calculationId,
                           @NotNull JsclOperation operation,
                           @NotNull String expression,
                           @Nullable MessageRegistry mr) {
         synchronized (lock) {
+
             PreparedExpression preparedExpression = null;
 
+            fireCalculatorEvent(newCalculationEventData(operation, expression, calculationId), CalculatorEventType.calculation_started, new CalculatorInputImpl(expression, operation));
+
             try {
                 preparedExpression = preprocessor.process(expression);
 
                 final String jsclExpression = preparedExpression.toString();
+
                 try {
 
-                    final Generic genericResult = operation.evaluateGeneric(jsclExpression);
+                    final Generic result = operation.evaluateGeneric(jsclExpression);
 
                     // NOTE: toString() method must be called here as ArithmeticOperationException may occur in it (just to avoid later check!)
-                    genericResult.toString();
+                    result.toString();
+
+                    final CalculatorOutputImpl data = new CalculatorOutputImpl(operation.getFromProcessor().process(result), operation, result);
+                    fireCalculatorEvent(newCalculationEventData(operation, expression, calculationId), CalculatorEventType.calculation_result, data);
 
-                    //return new Result(operation.getFromProcessor().process(genericResult), operation, genericResult);
                 } catch (AbstractJsclArithmeticException e) {
-                    handleException(eventDataId, operation, expression, mr, preparedExpression, null, new CalculatorEvalException(e, e, jsclExpression));
+                    handleException(calculationId, operation, expression, mr, new CalculatorEvalException(e, e, jsclExpression));
                 }
 
             } catch (ArithmeticException e) {
-                //final AndroidMessage androidMessage = new AndroidMessage(R.string.msg_1, MessageType.error, CalculatorApplication.getInstance(), e.getMessage());
+                handleException(calculationId, operation, expression, mr, preparedExpression, new CalculatorParseException(expression, new CalculatorMessage(CalculatorMessages.msg_001, MessageType.error, e.getMessage())));
-                handleException(operation, expression, mr, preparedExpression, new CalculatorParseException(jsclExpression, androidMessage));
             } catch (StackOverflowError e) {
-                //final AndroidMessage androidMessage = new AndroidMessage(R.string.msg_2, MessageType.error, CalculatorApplication.getInstance());
+                handleException(calculationId, operation, expression, mr, preparedExpression, new CalculatorParseException(expression, new CalculatorMessage(CalculatorMessages.msg_002, MessageType.error)));
-                handleException(eventDataId, operation, expression, mr, preparedExpression, new CalculatorParseException(e), null);
             } catch (jscl.text.ParseException e) {
-                //System.out.println(e.getMessage());
+                handleException(calculationId, operation, expression, mr, preparedExpression, new CalculatorParseException(e));
-                handleException(eventDataId, operation, expression, mr, preparedExpression, new CalculatorParseException(e), null);
             } catch (ParseInterruptedException e) {
+
                 // do nothing - we ourselves interrupt the calculations
+                fireCalculatorEvent(newCalculationEventData(operation, expression, calculationId), CalculatorEventType.calculation_cancelled, null);
+
             } catch (CalculatorParseException e) {
-                handleException(eventDataId, operation, expression, mr, preparedExpression, e, null);
+                handleException(calculationId, operation, expression, mr, preparedExpression, e);
+            } finally {
+                fireCalculatorEvent(newCalculationEventData(operation, expression, calculationId), CalculatorEventType.calculation_finished, null);
             }
         }
     }
 
-    private void handleException(@NotNull CalculatorEventDataId eventDataId,
+    @NotNull
+    private CalculatorEventData newCalculationEventData(@NotNull JsclOperation operation,
+                                                        @NotNull String expression,
+                                                        @NotNull Long calculationId) {
+        return new CalculatorEvaluationEventDataImpl(CalculatorEventDataImpl.newInstance(nextEventDataId(calculationId)), operation, expression);
+    }
+
+    private void handleException(@NotNull Long calculationId,
                                  @NotNull JsclOperation operation,
                                  @NotNull String expression,
                                  @Nullable MessageRegistry mr,
                                  @Nullable PreparedExpression preparedExpression,
-                                 @Nullable CalculatorParseException parseException,
+                                 @NotNull CalculatorParseException parseException) {
-                                 @Nullable CalculatorEvalException evalException) {
+
-        if (operation == JsclOperation.numeric && (preparedExpression != null && preparedExpression.isExistsUndefinedVar() || (evalException != null && evalException.getCause() instanceof NumeralBaseException))) {
+        if (operation == JsclOperation.numeric
-            evaluate(eventDataId, JsclOperation.simplify, expression, mr);
+                && preparedExpression != null
+                && preparedExpression.isExistsUndefinedVar()) {
+
+            evaluate(calculationId, JsclOperation.simplify, expression, mr);
+
         }
 
-        if (parseException != null) {
+        fireCalculatorEvent(newCalculationEventData(operation, expression, calculationId), CalculatorEventType.calculation_failed, new CalculatorFailureImpl(parseException));
-            throw parseException;
-        } else {
-            throw evalException;
     }
+
+    private void handleException(@NotNull Long calculationId,
+                                 @NotNull JsclOperation operation,
+                                 @NotNull String expression,
+                                 @Nullable MessageRegistry mr,
+                                 @NotNull CalculatorEvalException evalException) {
+
+        if (operation == JsclOperation.numeric && evalException.getCause() instanceof NumeralBaseException) {
+            evaluate(calculationId, JsclOperation.simplify, expression, mr);
+        }
+
+        fireCalculatorEvent(newCalculationEventData(operation, expression, calculationId), CalculatorEventType.calculation_failed, new CalculatorFailureImpl(evalException));
     }
 
     /*

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorInput.java

@@ -0,0 +1,18 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 7:25 PM
+ */
+public interface CalculatorInput {
+
+    @NotNull
+    String getExpression();
+
+    @NotNull
+    JsclOperation getOperation();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorInputImpl.java

@@ -0,0 +1,35 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 7:26 PM
+ */
+public class CalculatorInputImpl implements CalculatorInput {
+
+    @NotNull
+    private String expression;
+
+    @NotNull
+    private JsclOperation operation;
+
+    public CalculatorInputImpl(@NotNull String expression, @NotNull JsclOperation operation) {
+        this.expression = expression;
+        this.operation = operation;
+    }
+
+    @Override
+    @NotNull
+    public String getExpression() {
+        return expression;
+    }
+
+    @Override
+    @NotNull
+    public JsclOperation getOperation() {
+        return operation;
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java

@@ -12,5 +12,11 @@ public interface CalculatorLocator {
     @NotNull
     JCalculatorEngine getCalculatorEngine();
 
+    @NotNull
+    Calculator getCalculator();
+
+    @NotNull
+    CalculatorDisplay getCalculatorDisplay();
+
     void setCalculatorEngine(@NotNull JCalculatorEngine calculatorEngine);
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocatorImpl.java

@@ -12,6 +12,12 @@ public class CalculatorLocatorImpl implements CalculatorLocator {
     @NotNull
     private JCalculatorEngine calculatorEngine;
 
+    @NotNull
+    private CalculatorDisplay calculatorDisplay = new CalculatorDisplayImpl();
+
+    @NotNull
+    private Calculator calculator = new CalculatorImpl();
+
     @NotNull
     private static final CalculatorLocator instance = new CalculatorLocatorImpl();
 
@@ -29,8 +35,20 @@ public class CalculatorLocatorImpl implements CalculatorLocator {
         return calculatorEngine;
     }
 
+    @NotNull
+    @Override
+    public Calculator getCalculator() {
+        return this.calculator;
+    }
+
     @Override
     public void setCalculatorEngine(@NotNull JCalculatorEngine calculatorEngine) {
         this.calculatorEngine = calculatorEngine;
     }
+
+    @Override
+    @NotNull
+    public CalculatorDisplay getCalculatorDisplay() {
+        return calculatorDisplay;
+    }
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorMessage.java

@@ -0,0 +1,31 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.common.msg.AbstractMessage;
+import org.solovyev.common.msg.MessageType;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.ResourceBundle;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 8:06 PM
+ */
+public class CalculatorMessage extends AbstractMessage {
+
+    protected CalculatorMessage(@NotNull String messageCode, @NotNull MessageType messageType, @org.jetbrains.annotations.Nullable Object... parameters) {
+        super(messageCode, messageType, parameters);
+    }
+
+    protected CalculatorMessage(@NotNull String messageCode, @NotNull MessageType messageType, @NotNull List<?> parameters) {
+        super(messageCode, messageType, parameters);
+    }
+
+    @Override
+    protected String getMessagePattern(@NotNull Locale locale) {
+        final ResourceBundle rb = CalculatorMessages.getBundle(locale);
+        return rb.getString(getMessageCode());
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorMessages.java

@@ -0,0 +1,69 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.ResourceBundle;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 8:10 PM
+ */
+public final class CalculatorMessages {
+
+    @NotNull
+    private static final Map<Locale, ResourceBundle> bundlesByLocale = new HashMap<Locale, ResourceBundle>();
+
+    private CalculatorMessages() {
+        throw new AssertionError();
+    }
+
+    @NotNull
+    public static ResourceBundle getBundle() {
+        return getBundle(Locale.getDefault());
+    }
+
+    @NotNull
+    public static ResourceBundle getBundle(@NotNull Locale locale) {
+        synchronized (bundlesByLocale) {
+            ResourceBundle result = bundlesByLocale.get(locale);
+            if (result == null) {
+                result = ResourceBundle.getBundle("org/solovyev/android/calculator/messages", locale);
+                bundlesByLocale.put(locale, result);
+            }
+
+            return result;
+        }
+    }
+
+    /* Arithmetic error occurred: {0} */
+    @NotNull
+    public static final String msg_001 = "msg_1";
+
+    /* Too complex expression*/
+    @NotNull
+    public static final String msg_002 = "msg_2";
+
+    /* Too long execution time - check the expression*/
+    @NotNull
+    public static final String msg_003 = "msg_3";
+
+    /* Evaluation was cancelled*/
+    @NotNull
+    public static final String msg_004 = "msg_4";
+
+    /* No parameters are specified for function: {0}*/
+    @NotNull
+    public static final String msg_005 = "msg_5";
+
+    /* Infinite loop is detected in expression*/
+    @NotNull
+    public static final String msg_006 = "msg_6";
+
+    /* Error */
+    @NotNull
+    public static final String syntax_error = "syntax_error";
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorOutput.java

@@ -0,0 +1,22 @@
+package org.solovyev.android.calculator;
+
+import jscl.math.Generic;
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+/**
+ * User: serso
+ * Date: 9/20/12
+ * Time: 7:29 PM
+ */
+public interface CalculatorOutput {
+
+    @NotNull
+    String getStringResult();
+
+    @NotNull
+    JsclOperation getOperation();
+
+    @NotNull
+    Generic getResult();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorOutputImpl.java

@@ -0,0 +1,46 @@
+package org.solovyev.android.calculator;
+
+import jscl.math.Generic;
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+/**
+* User: serso
+* Date: 9/20/12
+* Time: 7:28 PM
+*/
+public class CalculatorOutputImpl implements CalculatorOutput {
+
+    @NotNull
+    private Generic result;
+
+    @NotNull
+    private String stringResult;
+
+    @NotNull
+    private JsclOperation operation;
+
+    public CalculatorOutputImpl(@NotNull String stringResult, @NotNull JsclOperation operation, @NotNull Generic result) {
+        this.stringResult = stringResult;
+        this.operation = operation;
+        this.result = result;
+    }
+
+    @Override
+    @NotNull
+    public String getStringResult() {
+        return stringResult;
+    }
+
+    @Override
+    @NotNull
+    public JsclOperation getOperation() {
+        return operation;
+    }
+
+    @Override
+    @NotNull
+    public Generic getResult() {
+        return result;
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/JCalculatorDisplay.java

@@ -1,40 +0,0 @@
-/*
- * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
- * For more information, please, contact se.solovyev@gmail.com
- * or visit http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator;
-
-import jscl.math.Generic;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-import org.solovyev.android.calculator.Editor;
-import org.solovyev.android.calculator.jscl.JsclOperation;
-
-/**
- * User: serso
- * Date: 12/17/11
- * Time: 9:45 PM
- */
-public interface JCalculatorDisplay extends Editor{
-
-	boolean isValid();
-
-	void setValid(boolean valid);
-
-	@Nullable
-	String getErrorMessage();
-
-	void setErrorMessage(@Nullable String errorMessage);
-
-	void setJsclOperation(@NotNull JsclOperation jsclOperation);
-
-	@NotNull
-	JsclOperation getJsclOperation();
-
-	void setGenericResult(@Nullable Generic genericResult);
-
-	@Nullable
-	Generic getGenericResult();
-}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/history/CalculatorDisplayHistoryState.java

@@ -11,8 +11,11 @@ import org.jetbrains.annotations.Nullable;
 import org.simpleframework.xml.Element;
 import org.simpleframework.xml.Root;
 import org.simpleframework.xml.Transient;
-import org.solovyev.android.calculator.JCalculatorDisplay;
+import org.solovyev.android.calculator.CalculatorDisplay;
+import org.solovyev.android.calculator.CalculatorDisplayViewState;
+import org.solovyev.android.calculator.CalculatorDisplayViewStateImpl;
 import org.solovyev.android.calculator.jscl.JsclOperation;
+import org.solovyev.common.text.StringUtils;
 
 /**
  * User: serso
@@ -47,24 +50,27 @@ public class CalculatorDisplayHistoryState implements Cloneable {
 	}
 
 	@NotNull
-	public static CalculatorDisplayHistoryState newInstance(@NotNull JCalculatorDisplay display) {
+	public static CalculatorDisplayHistoryState newInstance(@NotNull CalculatorDisplay display) {
 		final CalculatorDisplayHistoryState result = new CalculatorDisplayHistoryState();
 
-		result.editorState = EditorHistoryState.newInstance(display);
+		result.editorState = EditorHistoryState.newInstance(display.getViewState());
-		result.valid = display.isValid();
+
-		result.jsclOperation = display.getJsclOperation();
+        final CalculatorDisplayViewState displayViewState = display.getViewState();
-		result.genericResult = display.getGenericResult();
+
-		result.errorMessage = display.getErrorMessage();
+		result.valid = displayViewState.isValid();
+		result.jsclOperation = displayViewState.getOperation();
+		result.genericResult = displayViewState.getResult();
+		result.errorMessage = displayViewState.getErrorMessage();
 
 		return result;
 	}
 
-	public void setValuesFromHistory(@NotNull JCalculatorDisplay display) {
+	public void setValuesFromHistory(@NotNull CalculatorDisplay display) {
-		this.getEditorState().setValuesFromHistory(display);
+        if ( this.isValid() ) {
-		display.setValid(this.isValid());
+            display.setViewState(CalculatorDisplayViewStateImpl.newValidState(this.getJsclOperation(), this.getGenericResult(), StringUtils.getNotEmpty(this.getEditorState().getText(), ""), this.getEditorState().getCursorPosition()));
-		display.setErrorMessage(this.getErrorMessage());
+        } else {
-		display.setJsclOperation(this.getJsclOperation());
+            display.setViewState(CalculatorDisplayViewStateImpl.newErrorState(this.getJsclOperation(), StringUtils.getNotEmpty(this.getErrorMessage(), "")));
-		display.setGenericResult(this.getGenericResult());
+        }
 	}
 
 

calculatorpp-core/src/main/java/org/solovyev/android/calculator/history/CalculatorHistoryState.java

@@ -8,8 +8,8 @@ package org.solovyev.android.calculator.history;
 import org.jetbrains.annotations.NotNull;
 import org.simpleframework.xml.Element;
 import org.simpleframework.xml.Root;
+import org.solovyev.android.calculator.CalculatorDisplay;
 import org.solovyev.android.calculator.Editor;
-import org.solovyev.android.calculator.JCalculatorDisplay;
 
 /**
  * User: serso
@@ -38,7 +38,7 @@ public class CalculatorHistoryState extends AbstractHistoryState {
 		this.displayState = displayState;
 	}
 
-	public static CalculatorHistoryState newInstance(@NotNull Editor editor, @NotNull JCalculatorDisplay display) {
+	public static CalculatorHistoryState newInstance(@NotNull Editor editor, @NotNull CalculatorDisplay display) {
 		final EditorHistoryState editorHistoryState = EditorHistoryState.newInstance(editor);
 		final CalculatorDisplayHistoryState displayHistoryState = CalculatorDisplayHistoryState.newInstance(display);
 		return new CalculatorHistoryState(editorHistoryState, displayHistoryState);
@@ -94,7 +94,7 @@ public class CalculatorHistoryState extends AbstractHistoryState {
 		return result;
 	}
 
-	public void setValuesFromHistory(@NotNull Editor editor, @NotNull JCalculatorDisplay display) {
+	public void setValuesFromHistory(@NotNull Editor editor, @NotNull CalculatorDisplay display) {
 		this.getEditorState().setValuesFromHistory(editor);
 		this.getDisplayState().setValuesFromHistory(display);
 	}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/history/EditorHistoryState.java

@@ -9,6 +9,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.simpleframework.xml.Element;
 import org.simpleframework.xml.Root;
+import org.solovyev.android.calculator.CalculatorDisplayViewState;
 import org.solovyev.android.calculator.Editor;
 
 @Root
@@ -35,6 +36,16 @@ public class EditorHistoryState implements Cloneable{
 		return result;
 	}
 
+    @NotNull
+    public static EditorHistoryState newInstance(@NotNull CalculatorDisplayViewState viewState) {
+        final EditorHistoryState result = new EditorHistoryState();
+
+        result.text = viewState.getText();
+        result.cursorPosition = viewState.getSelection();
+
+        return result;
+    }
+
 	public void setValuesFromHistory(@NotNull Editor editor) {
 		editor.setText(this.getText());
 		editor.setSelection(this.getCursorPosition());

calculatorpp-core/src/main/resources/org/solovyev/android/calculator/messages.properties

@@ -0,0 +1,8 @@
+msg_1=Arithmetic error occurred: {0}
+msg_2=Too complex expression
+msg_3=Too long execution time - check the expression
+msg_4=Evaluation was cancelled
+msg_5=No parameters are specified for function: {0}
+msg_6=Infinite loop is detected in expression
+
+syntax_error=Error

calculatorpp/res/layout/calc_display.xml

@@ -6,7 +6,7 @@
   ~ or visit http://se.solovyev.org
   -->
 
-<org.solovyev.android.calculator.CalculatorDisplay
+<org.solovyev.android.calculator.AndroidCalculatorDisplayView
 		xmlns:a="http://schemas.android.com/apk/res/android"
 		a:id="@+id/calculatorDisplay"
 		style="@style/display_style"

calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorDisplayView.java

@@ -15,11 +15,9 @@ import jscl.math.Generic;
 import jscl.math.function.Constant;
 import jscl.math.function.IConstant;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.model.CalculatorEngine;
 import org.solovyev.android.calculator.text.TextProcessor;
-import org.solovyev.android.calculator.ToJsclTextProcessor;
 import org.solovyev.android.calculator.view.NumeralBaseConverterDialog;
 import org.solovyev.android.calculator.view.TextHighlighter;
 import org.solovyev.android.calculator.view.UnitConverterViewBuilder;
@@ -37,9 +35,9 @@ import java.util.Set;
  * Date: 9/17/11
  * Time: 10:58 PM
  */
-public class CalculatorDisplay extends AutoResizeTextView implements JCalculatorDisplay {
+public class AndroidCalculatorDisplayView extends AutoResizeTextView implements CalculatorDisplayView {
 
-    private static enum ConversionMenuItem implements AMenuItem<CalculatorDisplay> {
+    private static enum ConversionMenuItem implements AMenuItem<CalculatorDisplayView> {
         convert_to_bin(NumeralBase.bin),
         convert_to_dec(NumeralBase.dec),
         convert_to_hex(NumeralBase.hex);
@@ -72,12 +70,15 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
         }
 
         @Override
-        public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+        public void onClick(@NotNull CalculatorDisplayView data, @NotNull Context context) {
             final NumeralBase fromNumeralBase = CalculatorEngine.instance.getEngine().getNumeralBase();
 
+            final Generic lastResult = CalculatorLocatorImpl.getInstance().getCalculatorDisplay().getViewState().getResult();
+
+            if (lastResult != null) {
                 String to;
                 try {
-                to = convert(data.getGenericResult());
+                    to = convert(lastResult);
 
                     // add prefix
                     if (fromNumeralBase != toNumeralBase) {
@@ -88,7 +89,8 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
                 }
 
                 data.setText(to);
-            data.redraw();
+                //data.redraw();
+            }
         }
 
         @NotNull
@@ -112,18 +114,18 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
         }
     }
 
-    public static enum MenuItem implements LabeledMenuItem<CalculatorDisplay> {
+    public static enum MenuItem implements LabeledMenuItem<CalculatorDisplayView> {
 
         copy(R.string.c_copy) {
             @Override
-            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+            public void onClick(@NotNull CalculatorDisplayView data, @NotNull Context context) {
                 CalculatorModel.copyResult(context, data);
             }
         },
 
         convert_to_bin(R.string.convert_to_bin) {
             @Override
-            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+            public void onClick(@NotNull CalculatorDisplayView data, @NotNull Context context) {
                 ConversionMenuItem.convert_to_bin.onClick(data, context);
             }
 
@@ -135,7 +137,7 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
 
         convert_to_dec(R.string.convert_to_dec) {
             @Override
-            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+            public void onClick(@NotNull CalculatorDisplayView data, @NotNull Context context) {
                 ConversionMenuItem.convert_to_dec.onClick(data, context);
             }
 
@@ -147,7 +149,7 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
 
         convert_to_hex(R.string.convert_to_hex) {
             @Override
-            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+            public void onClick(@NotNull CalculatorDisplayView data, @NotNull Context context) {
                 ConversionMenuItem.convert_to_hex.onClick(data, context);
             }
 
@@ -159,8 +161,11 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
 
         convert(R.string.c_convert) {
             @Override
-            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+            public void onClick(@NotNull CalculatorDisplayView data, @NotNull Context context) {
-                new NumeralBaseConverterDialog(data.getGenericResult().toString()).show(context);
+                final Generic result = data.getState().getResult();
+                if (result != null) {
+                    new NumeralBaseConverterDialog(result.toString()).show(context);
+                }
             }
 
             @Override
@@ -171,8 +176,8 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
 
         plot(R.string.c_plot) {
             @Override
-            public void onClick(@NotNull CalculatorDisplay data, @NotNull Context context) {
+            public void onClick(@NotNull CalculatorDisplayView data, @NotNull Context context) {
-                final Generic generic = data.getGenericResult();
+                final Generic generic = data.getState().getResult();
                 assert generic != null;
 
                 final Constant constant = CollectionsUtils.getFirstCollectionElement(getNotSystemConstants(generic));
@@ -214,9 +219,9 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
             this.captionId = captionId;
         }
 
-		public final boolean isItemVisible(@NotNull CalculatorDisplay display) {
+        public final boolean isItemVisible(@NotNull CalculatorDisplayViewState displayViewState) {
             //noinspection ConstantConditions
-			return display.isValid() && display.getGenericResult() != null && isItemVisibleFor(display.getGenericResult(), display.getJsclOperation());
+            return displayViewState.isValid() && displayViewState.getResult() != null && isItemVisibleFor(displayViewState.getResult(), displayViewState.getOperation());
         }
 
         protected boolean isItemVisibleFor(@NotNull Generic generic, @NotNull JsclOperation operation) {
@@ -230,75 +235,50 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
         }
     }
 
-	private boolean valid = true;
-
-	@Nullable
-	private String errorMessage;
-
     @NotNull
-	private JsclOperation jsclOperation = JsclOperation.numeric;
+    private CalculatorDisplayViewState state = CalculatorDisplayViewStateImpl.newDefaultInstance();
 
     @NotNull
     private final static TextProcessor<TextHighlighter.Result, String> textHighlighter = new TextHighlighter(Color.WHITE, false, CalculatorEngine.instance.getEngine());
 
-	@Nullable
+    public AndroidCalculatorDisplayView(Context context) {
-	private Generic genericResult;
-
-	public CalculatorDisplay(Context context) {
         super(context);
     }
 
-	public CalculatorDisplay(Context context, AttributeSet attrs) {
+    public AndroidCalculatorDisplayView(Context context, AttributeSet attrs) {
         super(context, attrs);
     }
 
-	public CalculatorDisplay(Context context, AttributeSet attrs, int defStyle) {
+    public AndroidCalculatorDisplayView(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
     }
 
-	@Override
     public boolean isValid() {
-		return valid;
+        return this.state.isValid();
     }
 
+
     @Override
-	public void setValid(boolean valid) {
+    public void setState(@NotNull CalculatorDisplayViewState state) {
-		this.valid = valid;
+        this.state = state;
-		if (valid) {
+        if ( state.isValid() ) {
-			errorMessage = null;
             setTextColor(getResources().getColor(R.color.default_text_color));
+            setText(state.getStringResult());
         } else {
             setTextColor(getResources().getColor(R.color.display_error_text_color));
+            setText(state.getErrorMessage());
         }
     }
 
-	@Override
-	@Nullable
-	public String getErrorMessage() {
-		return errorMessage;
-	}
-
-	@Override
-	public void setErrorMessage(@Nullable String errorMessage) {
-		this.errorMessage = errorMessage;
-	}
-
-	@Override
-	public void setJsclOperation(@NotNull JsclOperation jsclOperation) {
-		this.jsclOperation = jsclOperation;
-	}
-
-	@Override
     @NotNull
-	public JsclOperation getJsclOperation() {
+    @Override
-		return jsclOperation;
+    public CalculatorDisplayViewState getState() {
+        return this.state;
     }
 
     @Override
     public void setText(CharSequence text, BufferType type) {
         super.setText(text, type);
-
-		setValid(true);
     }
 
     public synchronized void redraw() {
@@ -324,17 +304,6 @@ public class CalculatorDisplay extends AutoResizeTextView implements JCalculator
         resizeText();
     }
 
-	@Override
-	public void setGenericResult(@Nullable Generic genericResult) {
-		this.genericResult = genericResult;
-	}
-
-	@Override
-	@Nullable
-	public Generic getGenericResult() {
-		return genericResult;
-	}
-
     @Override
     public int getSelection() {
         return this.getSelectionStart();

calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorModel.java

@@ -53,7 +53,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 	private CalculatorEditor editor;
 
 	@NotNull
-	private CalculatorDisplay display;
+	private AndroidCalculatorDisplayView display;
 
 	@NotNull
 	private CalculatorEngine calculatorEngine;
@@ -66,7 +66,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 		this.editor.init(preferences);
 		preferences.registerOnSharedPreferenceChangeListener(editor);
 
-		this.display = (CalculatorDisplay) activity.findViewById(R.id.calculatorDisplay);
+		this.display = (AndroidCalculatorDisplayView) activity.findViewById(R.id.calculatorDisplay);
 		this.display.setOnClickListener(new CalculatorDisplayOnClickListener(activity));
 
 		final CalculatorHistoryState lastState = AndroidCalculatorHistoryImpl.instance.getLastHistoryState();
@@ -97,8 +97,9 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 		copyResult(context, display);
 	}
 
-	public static void copyResult(@NotNull Context context, @NotNull final CalculatorDisplay display) {
+	public static void copyResult(@NotNull Context context, @NotNull final CalculatorDisplayView display) {
-		if (display.isValid()) {
+        final CalculatorDisplayViewState displayViewState = display.getState();
+		if (displayViewState.isValid()) {
 			final CharSequence text = display.getText();
 			if (!StringUtils.isEmpty(text)) {
 				final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Activity.CLIPBOARD_SERVICE);
@@ -228,16 +229,16 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 		if (!StringUtils.isEmpty(expression)) {
 			try {
 				Log.d(CalculatorModel.class.getName(), "Trying to evaluate '" + operation + "': " + expression /*+ StringUtils.fromStackTrace(Thread.currentThread().getStackTrace())*/);
-				final CalculatorEngine.Result result = calculatorEngine.evaluate(operation, expression);
+				final CalculatorOutput result = calculatorEngine.evaluate(operation, expression);
 
 				// todo serso: second condition might replaced with expression.equals(this.editor.getText().toString()) ONLY if expression will be formatted with text highlighter
 				if (currentRunner == pendingOperation.getObject() && this.editor.getText().length() > 0) {
-					display.setText(result.getResult());
+					display.setText(result.getStringResult());
 				} else {
 					display.setText("");
 				}
-				display.setJsclOperation(result.getUserOperation());
+				display.setJsclOperation(result.getOperation());
-				display.setGenericResult(result.getGenericResult());
+				display.setGenericResult(result.getResult());
 			} catch (CalculatorParseException e) {
 				handleEvaluationException(expression, display, operation, e);
 			} catch (CalculatorEvalException e) {
@@ -255,7 +256,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 	}
 
 	private void handleEvaluationException(@NotNull String expression,
-										   @NotNull CalculatorDisplay localDisplay,
+										   @NotNull AndroidCalculatorDisplayView localDisplay,
 										   @NotNull JsclOperation operation,
 										   @NotNull Message e) {
 		Log.d(CalculatorModel.class.getName(), "Evaluation failed for : " + expression + ". Error message: " + e);
@@ -367,7 +368,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 	}
 
 	@NotNull
-	public CalculatorDisplay getDisplay() {
+	public AndroidCalculatorDisplayView getDisplay() {
 		return display;
 	}
 
@@ -382,13 +383,15 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 
 		@Override
 		public void onClick(View v) {
-            if (v instanceof CalculatorDisplay) {
+            if (v instanceof CalculatorDisplayView) {
-                final CalculatorDisplay cd = (CalculatorDisplay) v;
+                final CalculatorDisplay cd = CalculatorLocatorImpl.getInstance().getCalculatorDisplay();
 
-                if (cd.isValid()) {
+                final CalculatorDisplayViewState displayViewState = cd.getViewState();
-                    final List<CalculatorDisplay.MenuItem> filteredMenuItems = new ArrayList<CalculatorDisplay.MenuItem>(CalculatorDisplay.MenuItem.values().length);
+
-                    for (CalculatorDisplay.MenuItem menuItem : CalculatorDisplay.MenuItem.values()) {
+                if (displayViewState.isValid()) {
-                        if (menuItem.isItemVisible(cd)) {
+                    final List<AndroidCalculatorDisplayView.MenuItem> filteredMenuItems = new ArrayList<AndroidCalculatorDisplayView.MenuItem>(AndroidCalculatorDisplayView.MenuItem.values().length);
+                    for (AndroidCalculatorDisplayView.MenuItem menuItem : AndroidCalculatorDisplayView.MenuItem.values()) {
+                        if (menuItem.isItemVisible(displayViewState)) {
                             filteredMenuItems.add(menuItem);
                         }
                     }
@@ -398,7 +401,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
                     }
 
                 } else {
-                    final String errorMessage = cd.getErrorMessage();
+                    final String errorMessage = displayViewState.getErrorMessage();
                     if (errorMessage != null) {
                         showEvaluationError(activity, errorMessage);
                     }

calculatorpp/src/main/java/org/solovyev/android/calculator/model/CalculatorEngine.java

@@ -142,45 +142,12 @@ public enum CalculatorEngine implements JCalculatorEngine {
 		this.multiplicationSign = multiplicationSign;
 	}
 
-	public static class Result {
+    public CalculatorOutput evaluate(@NotNull JsclOperation operation,
-
-		@NotNull
-		private Generic genericResult;
-
-		@NotNull
-		private String result;
-
-		@NotNull
-		private JsclOperation userOperation;
-
-		public Result(@NotNull String result, @NotNull JsclOperation userOperation, @NotNull Generic genericResult) {
-			this.result = result;
-			this.userOperation = userOperation;
-			this.genericResult = genericResult;
-		}
-
-		@NotNull
-		public String getResult() {
-			return result;
-		}
-
-		@NotNull
-		public JsclOperation getUserOperation() {
-			return userOperation;
-		}
-
-		@NotNull
-		public Generic getGenericResult() {
-			return genericResult;
-		}
-	}
-
-	public Result evaluate(@NotNull JsclOperation operation,
 						   @NotNull String expression) throws CalculatorParseException, CalculatorEvalException {
 		return evaluate(operation, expression, null);
 	}
 
-	public Result evaluate(@NotNull final JsclOperation operation,
+	public CalculatorOutput evaluate(@NotNull final JsclOperation operation,
 						   @NotNull String expression,
 						   @Nullable MessageRegistry mr) throws CalculatorParseException, CalculatorEvalException {
 		synchronized (lock) {
@@ -294,7 +261,7 @@ public enum CalculatorEngine implements JCalculatorEngine {
 
 			final Generic genericResult = calculationResult.getObject();
 
-			return new Result(operation.getFromProcessor().process(genericResult), operation, genericResult);
+			return new CalculatorOutputImpl(operation.getFromProcessor().process(genericResult), operation, genericResult);
 		}
 	}
 

calculatorpp/src/test/java/org/solovyev/android/calculator/history/HistoryUtilsTest.java

@@ -11,8 +11,8 @@ import junit.framework.Assert;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.junit.Test;
+import org.solovyev.android.calculator.CalculatorDisplay;
 import org.solovyev.android.calculator.Editor;
-import org.solovyev.android.calculator.JCalculatorDisplay;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.common.equals.CollectionEqualizer;
 import org.solovyev.common.equals.EqualsTool;
@@ -125,7 +125,7 @@ public class HistoryUtilsTest {
 
 		HistoryHelper<CalculatorHistoryState> history = new SimpleHistoryHelper<CalculatorHistoryState>();
 
-		JCalculatorDisplay calculatorDisplay = new TestCalculatorDisplay();
+		CalculatorDisplay calculatorDisplay = new TestCalculatorDisplay();
 		calculatorDisplay.setErrorMessage("error_msg1");
 		calculatorDisplay.setText("Error");
 		calculatorDisplay.setSelection(1);
@@ -215,7 +215,7 @@ public class HistoryUtilsTest {
 	}
 
 
-	private static class TestCalculatorDisplay implements JCalculatorDisplay {
+	private static class TestCalculatorDisplay implements CalculatorDisplay {
 
 		@NotNull
 		private final TestEditor testEditor = new TestEditor();

calculatorpp/src/test/java/org/solovyev/android/calculator/model/CalculatorEngineTest.java

@@ -54,13 +54,13 @@ public class CalculatorEngineTest {
 
 			}
 
-			Assert.assertEquals("0.017", cm.evaluate(JsclOperation.numeric, "1°").getResult());
+			Assert.assertEquals("0.017", cm.evaluate(JsclOperation.numeric, "1°").getStringResult());
-			Assert.assertEquals("0.349", cm.evaluate(JsclOperation.numeric, "20.0°").getResult());
+			Assert.assertEquals("0.349", cm.evaluate(JsclOperation.numeric, "20.0°").getStringResult());
-			Assert.assertEquals("0.5", cm.evaluate(JsclOperation.numeric, "sin(30°)").getResult());
+			Assert.assertEquals("0.5", cm.evaluate(JsclOperation.numeric, "sin(30°)").getStringResult());
-			Assert.assertEquals("0.524", cm.evaluate(JsclOperation.numeric, "asin(sin(30°))").getResult());
+			Assert.assertEquals("0.524", cm.evaluate(JsclOperation.numeric, "asin(sin(30°))").getStringResult());
-			Assert.assertEquals("∂(cos(t), t, t, 1°)", cm.evaluate(JsclOperation.numeric, "∂(cos(t),t,t,1°)").getResult());
+			Assert.assertEquals("∂(cos(t), t, t, 1°)", cm.evaluate(JsclOperation.numeric, "∂(cos(t),t,t,1°)").getStringResult());
 
-			Assert.assertEquals("∂(cos(t), t, t, 1°)", cm.evaluate(JsclOperation.simplify, "∂(cos(t),t,t,1°)").getResult());
+			Assert.assertEquals("∂(cos(t), t, t, 1°)", cm.evaluate(JsclOperation.simplify, "∂(cos(t),t,t,1°)").getStringResult());
 		} finally {
 			cm.getEngine().setAngleUnits(defaultAngleUnit);
 		}
@@ -113,120 +113,120 @@ public class CalculatorEngineTest {
 	public void testEvaluate() throws Exception {
 		final CalculatorEngine cm = CalculatorEngine.instance;
 
-		Assert.assertEquals("cos(t)+10%", cm.evaluate(JsclOperation.simplify, "cos(t)+10%").getResult());
+		Assert.assertEquals("cos(t)+10%", cm.evaluate(JsclOperation.simplify, "cos(t)+10%").getStringResult());
 
 		final Generic expression = cm.getEngine().simplifyGeneric("cos(t)+10%");
 		expression.substitute(new Constant("t"), Expression.valueOf(100d));
 
-		Assert.assertEquals("it", cm.evaluate(JsclOperation.simplify, "it").getResult());
+		Assert.assertEquals("it", cm.evaluate(JsclOperation.simplify, "it").getStringResult());
-		Assert.assertEquals("10%", cm.evaluate(JsclOperation.simplify, "10%").getResult());
+		Assert.assertEquals("10%", cm.evaluate(JsclOperation.simplify, "10%").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(0, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(0, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(1, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(1, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(  1,   1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(  1,   1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.simplify, "eq(  1,   1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.simplify, "eq(  1,   1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "lg(10)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "lg(10)").getStringResult());
-		Assert.assertEquals("4", cm.evaluate(JsclOperation.numeric, "2+2").getResult());
+		Assert.assertEquals("4", cm.evaluate(JsclOperation.numeric, "2+2").getStringResult());
 		final AngleUnit defaultAngleUnit = cm.getEngine().getAngleUnits();
 		try {
 			cm.getEngine().setAngleUnits(AngleUnit.rad);
-			Assert.assertEquals("-0.757", cm.evaluate(JsclOperation.numeric, "sin(4)").getResult());
+			Assert.assertEquals("-0.757", cm.evaluate(JsclOperation.numeric, "sin(4)").getStringResult());
-			Assert.assertEquals("0.524", cm.evaluate(JsclOperation.numeric, "asin(0.5)").getResult());
+			Assert.assertEquals("0.524", cm.evaluate(JsclOperation.numeric, "asin(0.5)").getStringResult());
-			Assert.assertEquals("-0.396", cm.evaluate(JsclOperation.numeric, "sin(4)asin(0.5)").getResult());
+			Assert.assertEquals("-0.396", cm.evaluate(JsclOperation.numeric, "sin(4)asin(0.5)").getStringResult());
-			Assert.assertEquals("-0.56", cm.evaluate(JsclOperation.numeric, "sin(4)asin(0.5)√(2)").getResult());
+			Assert.assertEquals("-0.56", cm.evaluate(JsclOperation.numeric, "sin(4)asin(0.5)√(2)").getStringResult());
-			Assert.assertEquals("-0.56", cm.evaluate(JsclOperation.numeric, "sin(4)asin(0.5)√(2)").getResult());
+			Assert.assertEquals("-0.56", cm.evaluate(JsclOperation.numeric, "sin(4)asin(0.5)√(2)").getStringResult());
 		} finally {
 			cm.getEngine().setAngleUnits(defaultAngleUnit);
 		}
-		Assert.assertEquals("7.389", cm.evaluate(JsclOperation.numeric, "e^2").getResult());
+		Assert.assertEquals("7.389", cm.evaluate(JsclOperation.numeric, "e^2").getStringResult());
-		Assert.assertEquals("7.389", cm.evaluate(JsclOperation.numeric, "exp(1)^2").getResult());
+		Assert.assertEquals("7.389", cm.evaluate(JsclOperation.numeric, "exp(1)^2").getStringResult());
-		Assert.assertEquals("7.389", cm.evaluate(JsclOperation.numeric, "exp(2)").getResult());
+		Assert.assertEquals("7.389", cm.evaluate(JsclOperation.numeric, "exp(2)").getStringResult());
-		Assert.assertEquals("2+i", cm.evaluate(JsclOperation.numeric, "2*1+√(-1)").getResult());
+		Assert.assertEquals("2+i", cm.evaluate(JsclOperation.numeric, "2*1+√(-1)").getStringResult());
 		try {
 			cm.getEngine().setAngleUnits(AngleUnit.rad);
-			Assert.assertEquals("0.921+Πi", cm.evaluate(JsclOperation.numeric, "ln(5cosh(38π√(2cos(2))))").getResult());
+			Assert.assertEquals("0.921+Πi", cm.evaluate(JsclOperation.numeric, "ln(5cosh(38π√(2cos(2))))").getStringResult());
-			Assert.assertEquals("-3.41+3.41i", cm.evaluate(JsclOperation.numeric, "(5tan(2i)+2i)/(1-i)").getResult());
+			Assert.assertEquals("-3.41+3.41i", cm.evaluate(JsclOperation.numeric, "(5tan(2i)+2i)/(1-i)").getStringResult());
 		} finally {
 			cm.getEngine().setAngleUnits(defaultAngleUnit);
 		}
-		Assert.assertEquals("7.389i", cm.evaluate(JsclOperation.numeric, "iexp(2)").getResult());
+		Assert.assertEquals("7.389i", cm.evaluate(JsclOperation.numeric, "iexp(2)").getStringResult());
-		Assert.assertEquals("2+7.389i", cm.evaluate(JsclOperation.numeric, "2+iexp(2)").getResult());
+		Assert.assertEquals("2+7.389i", cm.evaluate(JsclOperation.numeric, "2+iexp(2)").getStringResult());
-		Assert.assertEquals("2+7.389i", cm.evaluate(JsclOperation.numeric, "2+√(-1)exp(2)").getResult());
+		Assert.assertEquals("2+7.389i", cm.evaluate(JsclOperation.numeric, "2+√(-1)exp(2)").getStringResult());
-		Assert.assertEquals("2-2.5i", cm.evaluate(JsclOperation.numeric, "2-2.5i").getResult());
+		Assert.assertEquals("2-2.5i", cm.evaluate(JsclOperation.numeric, "2-2.5i").getStringResult());
-		Assert.assertEquals("-2-2.5i", cm.evaluate(JsclOperation.numeric, "-2-2.5i").getResult());
+		Assert.assertEquals("-2-2.5i", cm.evaluate(JsclOperation.numeric, "-2-2.5i").getStringResult());
-		Assert.assertEquals("-2+2.5i", cm.evaluate(JsclOperation.numeric, "-2+2.5i").getResult());
+		Assert.assertEquals("-2+2.5i", cm.evaluate(JsclOperation.numeric, "-2+2.5i").getStringResult());
-		Assert.assertEquals("-2+2.1i", cm.evaluate(JsclOperation.numeric, "-2+2.1i").getResult());
+		Assert.assertEquals("-2+2.1i", cm.evaluate(JsclOperation.numeric, "-2+2.1i").getStringResult());
-		Assert.assertEquals("-0.1-0.2i", cm.evaluate(JsclOperation.numeric, "(1-i)/(2+6i)").getResult());
+		Assert.assertEquals("-0.1-0.2i", cm.evaluate(JsclOperation.numeric, "(1-i)/(2+6i)").getStringResult());
 		
-		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "4!").getResult());
+		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "4!").getStringResult());
-		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "(2+2)!").getResult());
+		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "(2+2)!").getStringResult());
-		junit.framework.Assert.assertEquals("120", cm.evaluate(JsclOperation.numeric, "(2+2+1)!").getResult());
+		junit.framework.Assert.assertEquals("120", cm.evaluate(JsclOperation.numeric, "(2+2+1)!").getStringResult());
-		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "(2.0+2.0)!").getResult());
+		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "(2.0+2.0)!").getStringResult());
-		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "4.0!").getResult());
+		junit.framework.Assert.assertEquals("24", cm.evaluate(JsclOperation.numeric, "4.0!").getStringResult());
-		junit.framework.Assert.assertEquals("720", cm.evaluate(JsclOperation.numeric, "(3!)!").getResult());
+		junit.framework.Assert.assertEquals("720", cm.evaluate(JsclOperation.numeric, "(3!)!").getStringResult());
 		junit.framework.Assert.assertEquals("36", Expression.valueOf("3!^2").numeric().toString());
 		junit.framework.Assert.assertEquals("3", Expression.valueOf("cubic(27)").numeric().toString());
 		try {
-			junit.framework.Assert.assertEquals("√(-1)!", cm.evaluate(JsclOperation.numeric, "i!").getResult());
+			junit.framework.Assert.assertEquals("√(-1)!", cm.evaluate(JsclOperation.numeric, "i!").getStringResult());
 			fail();
 		} catch (CalculatorParseException e) {
 		}
 
-		junit.framework.Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "(π/π)!").getResult());
+		junit.framework.Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "(π/π)!").getStringResult());
 
 		try {
-			junit.framework.Assert.assertEquals("i", cm.evaluate(JsclOperation.numeric, "(-1)i!").getResult());
+			junit.framework.Assert.assertEquals("i", cm.evaluate(JsclOperation.numeric, "(-1)i!").getStringResult());
 			fail();
 		} catch (CalculatorParseException e) {
 
 		}
-		junit.framework.Assert.assertEquals("24i", cm.evaluate(JsclOperation.numeric, "4!i").getResult());
+		junit.framework.Assert.assertEquals("24i", cm.evaluate(JsclOperation.numeric, "4!i").getStringResult());
 
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("si", 5d));
 
 		try {
 			cm.getEngine().setAngleUnits(AngleUnit.rad);
-			Assert.assertEquals("0.451", cm.evaluate(JsclOperation.numeric, "acos(0.8999999999999811)").getResult());
+			Assert.assertEquals("0.451", cm.evaluate(JsclOperation.numeric, "acos(0.8999999999999811)").getStringResult());
-			Assert.assertEquals("-0.959", cm.evaluate(JsclOperation.numeric, "sin(5)").getResult());
+			Assert.assertEquals("-0.959", cm.evaluate(JsclOperation.numeric, "sin(5)").getStringResult());
-			Assert.assertEquals("-4.795", cm.evaluate(JsclOperation.numeric, "sin(5)si").getResult());
+			Assert.assertEquals("-4.795", cm.evaluate(JsclOperation.numeric, "sin(5)si").getStringResult());
-			Assert.assertEquals("-23.973", cm.evaluate(JsclOperation.numeric, "sisin(5)si").getResult());
+			Assert.assertEquals("-23.973", cm.evaluate(JsclOperation.numeric, "sisin(5)si").getStringResult());
-			Assert.assertEquals("-23.973", cm.evaluate(JsclOperation.numeric, "si*sin(5)si").getResult());
+			Assert.assertEquals("-23.973", cm.evaluate(JsclOperation.numeric, "si*sin(5)si").getStringResult());
-			Assert.assertEquals("-3.309", cm.evaluate(JsclOperation.numeric, "sisin(5si)si").getResult());
+			Assert.assertEquals("-3.309", cm.evaluate(JsclOperation.numeric, "sisin(5si)si").getStringResult());
 		} finally {
 			cm.getEngine().setAngleUnits(defaultAngleUnit);
 		}
 
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("s", 1d));
-		Assert.assertEquals("5", cm.evaluate(JsclOperation.numeric, "si").getResult());
+		Assert.assertEquals("5", cm.evaluate(JsclOperation.numeric, "si").getStringResult());
 
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("k", 3.5d));
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("k1", 4d));
-		Assert.assertEquals("4", cm.evaluate(JsclOperation.numeric, "k11").getResult());
+		Assert.assertEquals("4", cm.evaluate(JsclOperation.numeric, "k11").getStringResult());
 
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("t", (String) null));
-		Assert.assertEquals("11t", cm.evaluate(JsclOperation.numeric, "t11").getResult());
+		Assert.assertEquals("11t", cm.evaluate(JsclOperation.numeric, "t11").getStringResult());
-		Assert.assertEquals("11et", cm.evaluate(JsclOperation.numeric, "t11e").getResult());
+		Assert.assertEquals("11et", cm.evaluate(JsclOperation.numeric, "t11e").getStringResult());
-		Assert.assertEquals("∞", cm.evaluate(JsclOperation.numeric, "∞").getResult());
+		Assert.assertEquals("∞", cm.evaluate(JsclOperation.numeric, "∞").getStringResult());
-		Assert.assertEquals("∞", cm.evaluate(JsclOperation.numeric, "Infinity").getResult());
+		Assert.assertEquals("∞", cm.evaluate(JsclOperation.numeric, "Infinity").getStringResult());
-		Assert.assertEquals("11∞t", cm.evaluate(JsclOperation.numeric, "t11∞").getResult());
+		Assert.assertEquals("11∞t", cm.evaluate(JsclOperation.numeric, "t11∞").getStringResult());
-		Assert.assertEquals("-t+t^3", cm.evaluate(JsclOperation.numeric, "t(t-1)(t+1)").getResult());
+		Assert.assertEquals("-t+t^3", cm.evaluate(JsclOperation.numeric, "t(t-1)(t+1)").getStringResult());
 
-		Assert.assertEquals("100", cm.evaluate(JsclOperation.numeric, "0.1E3").getResult());
+		Assert.assertEquals("100", cm.evaluate(JsclOperation.numeric, "0.1E3").getStringResult());
-		Assert.assertEquals("3.957", cm.evaluate(JsclOperation.numeric, "ln(8)lg(8)+ln(8)").getResult());
+		Assert.assertEquals("3.957", cm.evaluate(JsclOperation.numeric, "ln(8)lg(8)+ln(8)").getStringResult());
 
-		Assert.assertEquals("0.933", cm.evaluate(JsclOperation.numeric, "0x:E/0x:F").getResult());
+		Assert.assertEquals("0.933", cm.evaluate(JsclOperation.numeric, "0x:E/0x:F").getStringResult());
 
 		try {
 		 	cm.getEngine().setNumeralBase(NumeralBase.hex);
-			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.numeric, "0x:E/0x:F").getResult());
+			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.numeric, "0x:E/0x:F").getStringResult());
-			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.simplify, "0x:E/0x:F").getResult());
+			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.simplify, "0x:E/0x:F").getStringResult());
-			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.numeric, "E/F").getResult());
+			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.numeric, "E/F").getStringResult());
-			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.simplify, "E/F").getResult());
+			Assert.assertEquals("E/F", cm.evaluate(JsclOperation.simplify, "E/F").getStringResult());
 		} finally {
 			cm.getEngine().setNumeralBase(NumeralBase.dec);
 		}
 
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "((((((0))))))").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "((((((0))))))").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))").getStringResult());
 
 
 		/*	Assert.assertEquals("0.524", cm.evaluate(JsclOperation.numeric, "30°").getResult());
@@ -249,11 +249,11 @@ public class CalculatorEngineTest {
 		}*/
 
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("t", (String) null));
-		Assert.assertEquals("2t", cm.evaluate(JsclOperation.simplify, "∂(t^2,t)").getResult());
+		Assert.assertEquals("2t", cm.evaluate(JsclOperation.simplify, "∂(t^2,t)").getStringResult());
-		Assert.assertEquals("2t", cm.evaluate(JsclOperation.numeric, "∂(t^2,t)").getResult());
+		Assert.assertEquals("2t", cm.evaluate(JsclOperation.numeric, "∂(t^2,t)").getStringResult());
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("t", "2"));
-		Assert.assertEquals("2t", cm.evaluate(JsclOperation.simplify, "∂(t^2,t)").getResult());
+		Assert.assertEquals("2t", cm.evaluate(JsclOperation.simplify, "∂(t^2,t)").getStringResult());
-		Assert.assertEquals("4", cm.evaluate(JsclOperation.numeric, "∂(t^2,t)").getResult());
+		Assert.assertEquals("4", cm.evaluate(JsclOperation.numeric, "∂(t^2,t)").getStringResult());
 
 		Assert.assertEquals("-x+x*ln(x)", cm.getEngine().simplify("∫(ln(x), x)"));
 		Assert.assertEquals("-(x-x*ln(x))/(ln(2)+ln(5))", cm.getEngine().simplify("∫(log(10, x), x)"));
@@ -267,7 +267,7 @@ public class CalculatorEngineTest {
 	public void testFormatting() throws Exception {
 		final CalculatorEngine ce = CalculatorEngine.instance;
 
-		Assert.assertEquals("12 345", ce.evaluate(JsclOperation.simplify, "12345").getResult());
+		Assert.assertEquals("12 345", ce.evaluate(JsclOperation.simplify, "12345").getStringResult());
 
 	}
 
@@ -275,7 +275,7 @@ public class CalculatorEngineTest {
 	public void testI() throws CalculatorParseException, CalculatorEvalException {
 		final CalculatorEngine cm = CalculatorEngine.instance;
 
-		Assert.assertEquals("-i", cm.evaluate(JsclOperation.numeric, "i^3").getResult());
+		Assert.assertEquals("-i", cm.evaluate(JsclOperation.numeric, "i^3").getStringResult());
 		for (int i = 0; i < 1000; i++) {
 		 	double real = (Math.random()-0.5) * 1000;
 		 	double imag = (Math.random()-0.5) * 1000;
@@ -289,7 +289,7 @@ public class CalculatorEngineTest {
 			sb.append(imag);
 			sb.append("^").append(exp);
 			try {
-				cm.evaluate(JsclOperation.numeric, sb.toString()).getResult();
+				cm.evaluate(JsclOperation.numeric, sb.toString()).getStringResult();
 			} catch (Throwable e) {
 				fail(sb.toString());
 			}
@@ -304,7 +304,7 @@ public class CalculatorEngineTest {
 			Assert.fail();
 		} catch (CalculatorParseException e) {
 		}
-		Assert.assertEquals("0.34+1.382i", cm.evaluate(JsclOperation.numeric, "ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(100)))))))))))))))").getResult());
+		Assert.assertEquals("0.34+1.382i", cm.evaluate(JsclOperation.numeric, "ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(ln(100)))))))))))))))").getStringResult());
 		try {
 			cm.evaluate(JsclOperation.numeric, "cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos())))))))))))))))))))))))))))))))))))");
 			Assert.fail();
@@ -314,13 +314,13 @@ public class CalculatorEngineTest {
 		final AngleUnit defaultAngleUnit = cm.getEngine().getAngleUnits();
 		try {
 			cm.getEngine().setAngleUnits(AngleUnit.rad);
-			Assert.assertEquals("0.739", cm.evaluate(JsclOperation.numeric, "cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(1))))))))))))))))))))))))))))))))))))").getResult());
+			Assert.assertEquals("0.739", cm.evaluate(JsclOperation.numeric, "cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(cos(1))))))))))))))))))))))))))))))))))))").getStringResult());
 		} finally {
 			cm.getEngine().setAngleUnits(defaultAngleUnit);
 		}
 
 		CalculatorEngine.instance.getVarsRegistry().add(new Var.Builder("si", 5d));
-		Assert.assertEquals("5", cm.evaluate(JsclOperation.numeric, "si").getResult());
+		Assert.assertEquals("5", cm.evaluate(JsclOperation.numeric, "si").getStringResult());
 
 		try {
 			cm.evaluate(JsclOperation.numeric, "sin");
@@ -339,11 +339,11 @@ public class CalculatorEngineTest {
 			decimalGroupSymbols.setGroupingSeparator('\'');
 			cm.setDecimalGroupSymbols(decimalGroupSymbols);
 			cm.setPrecision(2);
-			Assert.assertEquals("12'345'678.9", cm.evaluate(JsclOperation.numeric, "1.23456789E7").getResult());
+			Assert.assertEquals("12'345'678.9", cm.evaluate(JsclOperation.numeric, "1.23456789E7").getStringResult());
 			cm.setPrecision(10);
-			Assert.assertEquals("12'345'678.9", cm.evaluate(JsclOperation.numeric, "1.23456789E7").getResult());
+			Assert.assertEquals("12'345'678.9", cm.evaluate(JsclOperation.numeric, "1.23456789E7").getStringResult());
-			Assert.assertEquals("123'456'789", cm.evaluate(JsclOperation.numeric, "1.234567890E8").getResult());
+			Assert.assertEquals("123'456'789", cm.evaluate(JsclOperation.numeric, "1.234567890E8").getStringResult());
-			Assert.assertEquals("1'234'567'890.1", cm.evaluate(JsclOperation.numeric, "1.2345678901E9").getResult());
+			Assert.assertEquals("1'234'567'890.1", cm.evaluate(JsclOperation.numeric, "1.2345678901E9").getStringResult());
 		} finally {
 			cm.setPrecision(3);
 			DecimalFormatSymbols decimalGroupSymbols = new DecimalFormatSymbols(Locale.getDefault());
@@ -357,36 +357,36 @@ public class CalculatorEngineTest {
 	public void testComparisonFunction() throws Exception {
 		final CalculatorEngine cm = CalculatorEngine.instance;
 
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(0, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(0, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(1, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(1, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(1, 1.0)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "eq(1, 1.0)").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(1, 1.000000000000001)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(1, 1.000000000000001)").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(1, 0)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "eq(1, 0)").getStringResult());
 
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "lt(0, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "lt(0, 1)").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "lt(1, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "lt(1, 1)").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "lt(1, 0)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "lt(1, 0)").getStringResult());
 
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "gt(0, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "gt(0, 1)").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "gt(1, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "gt(1, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "gt(1, 0)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "gt(1, 0)").getStringResult());
 
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ne(0, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ne(0, 1)").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ne(1, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ne(1, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ne(1, 0)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ne(1, 0)").getStringResult());
 
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "le(0, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "le(0, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "le(1, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "le(1, 1)").getStringResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "le(1, 0)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "le(1, 0)").getStringResult());
 
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ge(0, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ge(0, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ge(1, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ge(1, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ge(1, 0)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ge(1, 0)").getStringResult());
 
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ap(0, 1)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ap(0, 1)").getStringResult());
-		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ap(1, 1)").getResult());
+		Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ap(1, 1)").getStringResult());
 		//Assert.assertEquals("1", cm.evaluate(JsclOperation.numeric, "ap(1, 1.000000000000001)").getResult());
-		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ap(1, 0)").getResult());
+		Assert.assertEquals("0", cm.evaluate(JsclOperation.numeric, "ap(1, 0)").getStringResult());
 
 	}
 
@@ -395,17 +395,17 @@ public class CalculatorEngineTest {
 	public void testNumeralSystems() throws Exception {
 		final CalculatorEngine cm = CalculatorEngine.instance;
 
-		Assert.assertEquals("11 259 375", cm.evaluate(JsclOperation.numeric, "0x:ABCDEF").getResult());
+		Assert.assertEquals("11 259 375", cm.evaluate(JsclOperation.numeric, "0x:ABCDEF").getStringResult());
-		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "0x:ABCDEF*e").getResult());
+		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "0x:ABCDEF*e").getStringResult());
-		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "e*0x:ABCDEF").getResult());
+		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "e*0x:ABCDEF").getStringResult());
-		Assert.assertEquals("e", cm.evaluate(JsclOperation.numeric, "e*0x:ABCDEF/0x:ABCDEF").getResult());
+		Assert.assertEquals("e", cm.evaluate(JsclOperation.numeric, "e*0x:ABCDEF/0x:ABCDEF").getStringResult());
-		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "0x:ABCDEF*e*0x:ABCDEF/0x:ABCDEF").getResult());
+		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "0x:ABCDEF*e*0x:ABCDEF/0x:ABCDEF").getStringResult());
-		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "c+0x:ABCDEF*e*0x:ABCDEF/0x:ABCDEF-c+0x:C-0x:C").getResult());
+		Assert.assertEquals("30 606 154.462", cm.evaluate(JsclOperation.numeric, "c+0x:ABCDEF*e*0x:ABCDEF/0x:ABCDEF-c+0x:C-0x:C").getStringResult());
-		Assert.assertEquals("1 446 257 064 651.832", cm.evaluate(JsclOperation.numeric, "28*28 * sin(28) - 0b:1101 + √(28) + exp ( 28) ").getResult());
+		Assert.assertEquals("1 446 257 064 651.832", cm.evaluate(JsclOperation.numeric, "28*28 * sin(28) - 0b:1101 + √(28) + exp ( 28) ").getStringResult());
-		Assert.assertEquals("13", cm.evaluate(JsclOperation.numeric, "0b:1101").getResult());
+		Assert.assertEquals("13", cm.evaluate(JsclOperation.numeric, "0b:1101").getStringResult());
 
 		try {
-			cm.evaluate(JsclOperation.numeric, "0b:π").getResult();
+			cm.evaluate(JsclOperation.numeric, "0b:π").getStringResult();
 			Assert.fail();
 		} catch (CalculatorParseException e) {
 			// ok
@@ -414,12 +414,12 @@ public class CalculatorEngineTest {
 		final NumeralBase defaultNumeralBase = cm.getEngine().getNumeralBase();
 		try{
 			cm.getEngine().setNumeralBase(NumeralBase.bin);
-			Assert.assertEquals("101", cm.evaluate(JsclOperation.numeric, "10+11").getResult());
+			Assert.assertEquals("101", cm.evaluate(JsclOperation.numeric, "10+11").getStringResult());
-			Assert.assertEquals("10/11", cm.evaluate(JsclOperation.numeric, "10/11").getResult());
+			Assert.assertEquals("10/11", cm.evaluate(JsclOperation.numeric, "10/11").getStringResult());
 
 			cm.getEngine().setNumeralBase(NumeralBase.hex);
-			Assert.assertEquals("63 7B", cm.evaluate(JsclOperation.numeric, "56CE+CAD").getResult());
+			Assert.assertEquals("63 7B", cm.evaluate(JsclOperation.numeric, "56CE+CAD").getStringResult());
-			Assert.assertEquals("E", cm.evaluate(JsclOperation.numeric, "E").getResult());
+			Assert.assertEquals("E", cm.evaluate(JsclOperation.numeric, "E").getStringResult());
 		} finally {
 			cm.setNumeralBase(defaultNumeralBase);
 		}
@@ -434,12 +434,12 @@ public class CalculatorEngineTest {
 
 		// logarithm
 		Assert.assertEquals("ln(x)/ln(base)", ((CustomFunction) cm.getFunctionsRegistry().get("log")).getContent());
-		Assert.assertEquals("∞", cm.evaluate(JsclOperation.numeric, "log(1, 10)").getResult());
+		Assert.assertEquals("∞", cm.evaluate(JsclOperation.numeric, "log(1, 10)").getStringResult());
-		Assert.assertEquals("3.322", cm.evaluate(JsclOperation.numeric, "log(2, 10)").getResult());
+		Assert.assertEquals("3.322", cm.evaluate(JsclOperation.numeric, "log(2, 10)").getStringResult());
-		Assert.assertEquals("1.431", cm.evaluate(JsclOperation.numeric, "log(5, 10)").getResult());
+		Assert.assertEquals("1.431", cm.evaluate(JsclOperation.numeric, "log(5, 10)").getStringResult());
-		Assert.assertEquals("0.96", cm.evaluate(JsclOperation.numeric, "log(11, 10)").getResult());
+		Assert.assertEquals("0.96", cm.evaluate(JsclOperation.numeric, "log(11, 10)").getStringResult());
-		Assert.assertEquals("1/(bln(a))", cm.evaluate(JsclOperation.simplify, "∂(log(a, b), b)").getResult());
+		Assert.assertEquals("1/(bln(a))", cm.evaluate(JsclOperation.simplify, "∂(log(a, b), b)").getStringResult());
-		Assert.assertEquals("-ln(b)/(aln(a)^2)", cm.evaluate(JsclOperation.simplify, "∂(log(a, b), a)").getResult());
+		Assert.assertEquals("-ln(b)/(aln(a)^2)", cm.evaluate(JsclOperation.simplify, "∂(log(a, b), a)").getStringResult());
 
 	}
 }

calculatorpp/src/test/java/org/solovyev/android/calculator/model/NumeralBaseTest.java

@@ -100,11 +100,11 @@ public class NumeralBaseTest {
 		final String bin = "0b:" + line[2].toUpperCase();
 
 		final String decExpression = converter.convert(dec);
-		final String decResult = CalculatorEngine.instance.evaluate(JsclOperation.numeric, decExpression).getResult();
+		final String decResult = CalculatorEngine.instance.evaluate(JsclOperation.numeric, decExpression).getStringResult();
 		final String hexExpression = converter.convert(hex);
-		final String hexResult = CalculatorEngine.instance.evaluate(JsclOperation.numeric, hexExpression).getResult();
+		final String hexResult = CalculatorEngine.instance.evaluate(JsclOperation.numeric, hexExpression).getStringResult();
 		final String binExpression = converter.convert(bin);
-		final String binResult = CalculatorEngine.instance.evaluate(JsclOperation.numeric, binExpression).getResult();
+		final String binResult = CalculatorEngine.instance.evaluate(JsclOperation.numeric, binExpression).getStringResult();
 
 		Assert.assertEquals("dec-hex: " + decExpression + " : " + hexExpression, decResult, hexResult);
 		Assert.assertEquals("dec-bin: " + decExpression + " : " + binExpression, decResult, binResult);