History refactor

app/src/main/java/org/solovyev/android/Check.java

@@ -22,6 +22,8 @@
 
 package org.solovyev.android;
 
+import android.os.Looper;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.Collection;
@@ -48,9 +50,15 @@ public final class Check {
     }
 
     public static void isMainThread() {
-        /*if (!junit && Looper.getMainLooper() != Looper.myLooper()) {
+        if (!junit && Looper.getMainLooper() != Looper.myLooper()) {
             throw new AssertionException("Should be called on the main thread");
-        }*/
+        }
+    }
+
+    public static void isNotMainThread() {
+        if (!junit && Looper.getMainLooper() == Looper.myLooper()) {
+            throw new AssertionException("Should not be called on the main thread");
+        }
     }
 
     public static void isNotNull(@Nullable Object o) {

app/src/main/java/org/solovyev/android/calculator/AndroidCalculator.java

@@ -27,7 +27,7 @@ import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 import jscl.NumeralBase;
 import jscl.math.Generic;
-import org.solovyev.android.calculator.history.HistoryState;
+import org.solovyev.android.calculator.history.OldHistoryState;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.common.history.HistoryAction;
 import org.solovyev.common.msg.Message;
@@ -156,12 +156,12 @@ public class AndroidCalculator implements Calculator, CalculatorEventListener, S
 
     @Override
     @Nonnull
-    public HistoryState getCurrentHistoryState() {
+    public OldHistoryState getCurrentHistoryState() {
         return calculator.getCurrentHistoryState();
     }
 
     @Override
-    public void setCurrentHistoryState(@Nonnull HistoryState editorHistoryState) {
+    public void setCurrentHistoryState(@Nonnull OldHistoryState editorHistoryState) {
         calculator.setCurrentHistoryState(editorHistoryState);
     }
 

app/src/main/java/org/solovyev/android/calculator/BaseUi.java

@@ -40,7 +40,7 @@ import org.solovyev.android.views.dragbutton.DragButton;
 import org.solovyev.android.views.dragbutton.DragDirection;
 import org.solovyev.android.views.dragbutton.DragListener;
 import org.solovyev.android.views.dragbutton.SimpleDragListener;
-import org.solovyev.android.calculator.history.HistoryState;
+import org.solovyev.android.calculator.history.OldHistoryState;
 import org.solovyev.android.calculator.history.HistoryDragProcessor;
 import org.solovyev.android.calculator.view.AngleUnitsButton;
 import org.solovyev.android.calculator.view.LongClickEraser;
@@ -165,7 +165,7 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
         final ViewsCache views = ViewsCache.forView(root);
         setOnDragListeners(views, activity);
 
-        HistoryDragProcessor<HistoryState> historyDragProcessor = new HistoryDragProcessor<>(getCalculator());
+        HistoryDragProcessor<OldHistoryState> historyDragProcessor = new HistoryDragProcessor<>(getCalculator());
         final DragListener historyDragListener = newDragListener(historyDragProcessor, activity);
         final DragButton historyButton = getButton(views, R.id.cpp_button_history);
         if (historyButton != null) {

app/src/main/java/org/solovyev/android/calculator/Calculator.java

@@ -24,7 +24,7 @@ package org.solovyev.android.calculator;
 
 import jscl.NumeralBase;
 import jscl.math.Generic;
-import org.solovyev.android.calculator.history.HistoryState;
+import org.solovyev.android.calculator.history.OldHistoryState;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.common.history.HistoryControl;
 
@@ -36,7 +36,7 @@ import javax.annotation.Nullable;
  * Date: 20.09.12
  * Time: 16:38
  */
-public interface Calculator extends CalculatorEventContainer, HistoryControl<HistoryState> {
+public interface Calculator extends CalculatorEventContainer, HistoryControl<OldHistoryState> {
 
     void init();
 

app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java

@@ -30,7 +30,7 @@ import org.acra.ACRA;
 import org.acra.ACRAConfiguration;
 import org.acra.sender.HttpSender;
 import org.solovyev.android.Android;
-import org.solovyev.android.calculator.history.AndroidCalculatorHistory;
+import org.solovyev.android.calculator.history.CalculatorHistory;
 import org.solovyev.android.calculator.language.Language;
 import org.solovyev.android.calculator.language.Languages;
 import org.solovyev.android.calculator.model.AndroidCalculatorEngine;
@@ -74,7 +74,7 @@ public class CalculatorApplication extends android.app.Application implements Sh
                 new AndroidCalculatorEngine(this),
                 new AndroidCalculatorClipboard(this),
                 new AndroidCalculatorNotifier(this),
-                new AndroidCalculatorHistory(this, calculator),
+                new CalculatorHistory(),
                 new AndroidCalculatorLogger(),
                 new AndroidCalculatorPreferenceService(this),
                 new CalculatorKeyboard(),
@@ -93,14 +93,7 @@ public class CalculatorApplication extends android.app.Application implements Sh
         App.getInitializer().execute(new Runnable() {
             @Override
             public void run() {
-                try {
+                warmUpEngine();
-                    // warm-up engine
-                    CalculatorMathEngine mathEngine = Locator.getInstance().getEngine().getMathEngine();
-                    mathEngine.evaluate("1+1");
-                    mathEngine.evaluate("1*1");
-                } catch (Throwable e) {
-                    Log.e(App.TAG, e.getMessage(), e);
-                }
             }
         });
 
@@ -113,6 +106,17 @@ public class CalculatorApplication extends android.app.Application implements Sh
         }, 100);
     }
 
+    private void warmUpEngine() {
+        try {
+            // warm-up engine
+            CalculatorMathEngine mathEngine = Locator.getInstance().getEngine().getMathEngine();
+            mathEngine.evaluate("1+1");
+            mathEngine.evaluate("1*1");
+        } catch (Throwable e) {
+            Log.e(App.TAG, e.getMessage(), e);
+        }
+    }
+
     private void onPreCreate(@Nonnull SharedPreferences preferences, @Nonnull Languages languages) {
         // first we need to setup crash handler and memory leak analyzer
         if (!BuildConfig.DEBUG) {

app/src/main/java/org/solovyev/android/calculator/CalculatorImpl.java

@@ -33,7 +33,7 @@ import jscl.math.function.IConstant;
 import jscl.math.operator.Operator;
 import jscl.text.ParseInterruptedException;
 import org.solovyev.android.calculator.history.CalculatorHistory;
-import org.solovyev.android.calculator.history.HistoryState;
+import org.solovyev.android.calculator.history.OldHistoryState;
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.model.Var;
 import org.solovyev.android.calculator.text.TextProcessor;
@@ -560,7 +560,7 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
     public void doHistoryAction(@Nonnull HistoryAction historyAction) {
         final CalculatorHistory history = Locator.getInstance().getHistory();
         if (history.isActionAvailable(historyAction)) {
-            final HistoryState newState = history.doAction(historyAction, getCurrentHistoryState());
+            final OldHistoryState newState = history.doAction(historyAction, getCurrentHistoryState());
             if (newState != null) {
                 setCurrentHistoryState(newState);
             }
@@ -569,12 +569,12 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
 
     @Nonnull
     @Override
-    public HistoryState getCurrentHistoryState() {
+    public OldHistoryState getCurrentHistoryState() {
-        return HistoryState.create(getEditor(), getDisplay());
+        return OldHistoryState.create(getEditor(), getDisplay());
     }
 
     @Override
-    public void setCurrentHistoryState(@Nonnull HistoryState editorHistoryState) {
+    public void setCurrentHistoryState(@Nonnull OldHistoryState editorHistoryState) {
         editorHistoryState.setValuesFromHistory(getEditor(), getDisplay());
     }
 

app/src/main/java/org/solovyev/android/calculator/Editor.java

@@ -23,7 +23,7 @@
 package org.solovyev.android.calculator;
 
 import org.solovyev.android.Check;
-import org.solovyev.android.calculator.history.EditorHistoryState;
+import org.solovyev.android.calculator.history.OldEditorHistoryState;
 import org.solovyev.android.calculator.text.TextProcessor;
 import org.solovyev.android.calculator.text.TextProcessorEditorResult;
 import org.solovyev.common.text.Strings;
@@ -104,7 +104,7 @@ public class Editor {
     }
 
     @Nonnull
-    public EditorState setState(@Nonnull EditorHistoryState state) {
+    public EditorState setState(@Nonnull OldEditorHistoryState state) {
         Check.isMainThread();
         return setText(Strings.getNotEmpty(state.getText(), ""), state.getCursorPosition());
     }

app/src/main/java/org/solovyev/android/calculator/Preferences.java

@@ -108,8 +108,6 @@ public final class Preferences {
         applyDefaultPreference(preferences, Gui.language);
 
         applyDefaultPreference(preferences, Graph.plotImag);
-        applyDefaultPreference(preferences, History.showIntermediateCalculations);
-        applyDefaultPreference(preferences, History.showDatetime);
         applyDefaultPreference(preferences, Calculations.calculateOnFly);
         applyDefaultPreference(preferences, Calculations.preferredAngleUnits);
         applyDefaultPreference(preferences, Calculations.preferredNumeralBase);

app/src/main/java/org/solovyev/android/calculator/history/AndroidCalculatorHistory.java

@@ -1,175 +0,0 @@
-/*
- * Copyright 2013 serso aka se.solovyev
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * Contact details
- *
- * Email: se.solovyev@gmail.com
- * Site:  http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator.history;
-
-import android.app.Application;
-import android.content.Context;
-import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
-
-import org.solovyev.android.calculator.Calculator;
-import org.solovyev.android.calculator.CalculatorEventData;
-import org.solovyev.android.calculator.CalculatorEventType;
-import org.solovyev.common.history.HistoryAction;
-
-import java.util.List;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
-/**
- * User: serso
- * Date: 10/9/11
- * Time: 6:35 PM
- */
-public class AndroidCalculatorHistory implements CalculatorHistory {
-
-    @Nonnull
-    private final CalculatorHistoryImpl calculatorHistory;
-
-    @Nonnull
-    private final Context context;
-
-    public AndroidCalculatorHistory(@Nonnull Application application, @Nonnull Calculator calculator) {
-        this.context = application;
-        calculatorHistory = new CalculatorHistoryImpl(calculator);
-    }
-
-    @Override
-    public void load() {
-        final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
-        if (preferences != null) {
-            final String value = preferences.getString("org.solovyev.android.calculator.CalculatorModel_history", null);
-            if (value != null) {
-                calculatorHistory.fromXml(value);
-            }
-        }
-    }
-
-    public void save() {
-        final SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context);
-        final SharedPreferences.Editor editor = settings.edit();
-
-        editor.putString("org.solovyev.android.calculator.CalculatorModel_history", calculatorHistory.toXml());
-
-        editor.apply();
-    }
-
-    public void clearSavedHistory() {
-        calculatorHistory.clearSavedHistory();
-        save();
-    }
-
-    public void removeSavedHistory(@Nonnull HistoryState historyState) {
-        historyState.setSaved(false);
-        calculatorHistory.removeSavedHistory(historyState);
-        save();
-    }
-
-    @Override
-    public boolean isEmpty() {
-        return calculatorHistory.isEmpty();
-    }
-
-    @Override
-    public HistoryState getLastHistoryState() {
-        return calculatorHistory.getLastHistoryState();
-    }
-
-    @Override
-    public boolean isUndoAvailable() {
-        return calculatorHistory.isUndoAvailable();
-    }
-
-    @Override
-    public HistoryState undo(@Nullable HistoryState currentState) {
-        return calculatorHistory.undo(currentState);
-    }
-
-    @Override
-    public boolean isRedoAvailable() {
-        return calculatorHistory.isRedoAvailable();
-    }
-
-    @Override
-    public HistoryState redo(@Nullable HistoryState currentState) {
-        return calculatorHistory.redo(currentState);
-    }
-
-    @Override
-    public boolean isActionAvailable(@Nonnull HistoryAction historyAction) {
-        return calculatorHistory.isActionAvailable(historyAction);
-    }
-
-    @Override
-    public HistoryState doAction(@Nonnull HistoryAction historyAction, @Nullable HistoryState currentState) {
-        return calculatorHistory.doAction(historyAction, currentState);
-    }
-
-    @Override
-    public void addState(@Nullable HistoryState currentState) {
-        calculatorHistory.addState(currentState);
-    }
-
-    @Nonnull
-    @Override
-    public List<HistoryState> getStates() {
-        return calculatorHistory.getStates();
-    }
-
-    @Nonnull
-    @Override
-    public List<HistoryState> getStates(boolean includeIntermediateStates) {
-        return calculatorHistory.getStates(includeIntermediateStates);
-    }
-
-    @Override
-    public void clear() {
-        calculatorHistory.clear();
-    }
-
-    @Nonnull
-    public List<HistoryState> getSavedHistory() {
-        return calculatorHistory.getSavedHistory();
-    }
-
-    @Nonnull
-    public HistoryState addSavedState(@Nonnull HistoryState historyState) {
-        return calculatorHistory.addSavedState(historyState);
-    }
-
-    @Override
-    public void fromXml(@Nonnull String xml) {
-        calculatorHistory.fromXml(xml);
-    }
-
-    @Override
-    public String toXml() {
-        return calculatorHistory.toXml();
-    }
-
-    @Override
-    public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
-        calculatorHistory.onCalculatorEvent(calculatorEventData, calculatorEventType, data);
-    }
-}

app/src/main/java/org/solovyev/android/calculator/history/BaseHistoryFragment.java

@@ -61,9 +61,9 @@ import static org.solovyev.android.calculator.CalculatorEventType.clear_history_
 
 public abstract class BaseHistoryFragment extends ListFragment implements CalculatorEventListener {
 
-    public static final Comparator<HistoryState> COMPARATOR = new Comparator<HistoryState>() {
+    public static final Comparator<OldHistoryState> COMPARATOR = new Comparator<OldHistoryState>() {
         @Override
-        public int compare(HistoryState state1, HistoryState state2) {
+        public int compare(OldHistoryState state1, OldHistoryState state2) {
             if (state1.isSaved() == state2.isSaved()) {
                 long l = state2.getTime() - state1.getTime();
                 return l > 0l ? 1 : (l < 0l ? -1 : 0);
@@ -103,15 +103,15 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
         ui = new FragmentUi(fragmentType.getDefaultLayoutId(), fragmentType.getDefaultTitleResId(), false);
     }
 
-    public static boolean isAlreadySaved(@Nonnull HistoryState historyState) {
+    public static boolean isAlreadySaved(@Nonnull OldHistoryState historyState) {
         Check.isTrue(!historyState.isSaved());
 
         boolean result = false;
         try {
             historyState.setSaved(true);
-            if (Collections.contains(historyState, Locator.getInstance().getHistory().getSavedHistory(), new Equalizer<HistoryState>() {
+            if (Collections.contains(historyState, Locator.getInstance().getHistory().getSavedOldHistory(), new Equalizer<OldHistoryState>() {
                 @Override
-                public boolean areEqual(@Nullable HistoryState first, @Nullable HistoryState second) {
+                public boolean areEqual(@Nullable OldHistoryState first, @Nullable OldHistoryState second) {
                     return first != null && second != null &&
                             first.getTime() == second.getTime() &&
                             first.getDisplayState().equals(second.getDisplayState()) &&
@@ -127,7 +127,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
     }
 
     @Nonnull
-    public static String getHistoryText(@Nonnull HistoryState state) {
+    public static String getHistoryText(@Nonnull OldHistoryState state) {
         final StringBuilder result = new StringBuilder();
         result.append(state.getEditorState().getText());
         result.append(getIdentitySign(state.getDisplayState().getJsclOperation()));
@@ -143,7 +143,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
         return jsclOperation == JsclOperation.simplify ? "≡" : "=";
     }
 
-    public void useState(@Nonnull final HistoryState state) {
+    public void useState(@Nonnull final OldHistoryState state) {
         App.getEditor().setState(state.getEditorState());
         final FragmentActivity activity = getActivity();
         if (!(activity instanceof CalculatorActivity)) {
@@ -180,7 +180,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
 
         ui.onViewCreated(this, root);
 
-        adapter = new HistoryArrayAdapter(this.getActivity(), getItemLayoutId(), org.solovyev.android.calculator.R.id.history_item, new ArrayList<HistoryState>(), showDatetime);
+        adapter = new HistoryArrayAdapter(this.getActivity(), getItemLayoutId(), org.solovyev.android.calculator.R.id.history_item, new ArrayList<OldHistoryState>(), showDatetime);
         setListAdapter(adapter);
 
         final ListView lv = getListView();
@@ -200,7 +200,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
                                     final View view,
                                     final int position,
                                     final long id) {
-                useState((HistoryState) parent.getItemAtPosition(position));
+                useState((OldHistoryState) parent.getItemAtPosition(position));
             }
         });
 
@@ -221,7 +221,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
         super.onCreateContextMenu(menu, v, menuInfo);
         final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
-        final HistoryState state = (HistoryState) getListView().getItemAtPosition(info.position);
+        final OldHistoryState state = (OldHistoryState) getListView().getItemAtPosition(info.position);
 
         if (state.isSaved()) {
             menu.add(NONE, R.string.c_use, NONE, R.string.c_use);
@@ -247,7 +247,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
     public boolean onContextItemSelected(MenuItem item) {
         final Context context = getActivity();
         final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
-        final HistoryState state = (HistoryState) getListView().getItemAtPosition(info.position);
+        final OldHistoryState state = (OldHistoryState) getListView().getItemAtPosition(info.position);
 
         switch (item.getItemId()) {
             case R.string.c_use:
@@ -296,7 +296,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
         return super.onContextItemSelected(item);
     }
 
-    private void createEditHistoryDialog(@Nonnull final HistoryState state, @Nonnull final Context context, final boolean save) {
+    private void createEditHistoryDialog(@Nonnull final OldHistoryState state, @Nonnull final Context context, final boolean save) {
         final LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         final View editView = layoutInflater.inflate(R.layout.history_edit, null);
         final TextView historyExpression = (TextView) editView.findViewById(R.id.history_edit_expression);
@@ -313,7 +313,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         if (save) {
-                            final HistoryState savedHistoryItem = Locator.getInstance().getHistory().addSavedState(state);
+                            final OldHistoryState savedHistoryItem = Locator.getInstance().getHistory().addSavedState(state);
                             savedHistoryItem.setComment(comment.getText().toString());
                             Locator.getInstance().getHistory().save();
                             // we don't need to add element to the adapter as adapter of another activity must be updated and not this
@@ -331,7 +331,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
         builder.create().show();
     }
 
-    private boolean shouldHaveCopyResult(@Nonnull HistoryState state) {
+    private boolean shouldHaveCopyResult(@Nonnull OldHistoryState state) {
         return !state.getDisplayState().isValid() || !Strings.isEmpty(state.getDisplayState().getEditorState().getText());
     }
 
@@ -365,13 +365,13 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
     protected abstract int getItemLayoutId();
 
     private void updateAdapter() {
-        final List<HistoryState> historyList = getHistoryList();
+        final List<OldHistoryState> historyList = getHistoryList();
 
-        final ArrayAdapter<HistoryState> adapter = getAdapter();
+        final ArrayAdapter<OldHistoryState> adapter = getAdapter();
         try {
             adapter.setNotifyOnChange(false);
             adapter.clear();
-            for (HistoryState historyState : historyList) {
+            for (OldHistoryState historyState : historyList) {
                 adapter.add(historyState);
             }
         } finally {
@@ -382,15 +382,15 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
     }
 
     @Nonnull
-    private List<HistoryState> getHistoryList() {
+    private List<OldHistoryState> getHistoryList() {
-        final List<HistoryState> historyStates = getHistoryItems();
+        final List<OldHistoryState> historyStates = getHistoryItems();
 
         java.util.Collections.sort(historyStates, COMPARATOR);
 
-        final FilterRulesChain<HistoryState> filterRulesChain = new FilterRulesChain<>();
+        final FilterRulesChain<OldHistoryState> filterRulesChain = new FilterRulesChain<>();
-        filterRulesChain.addFilterRule(new JPredicate<HistoryState>() {
+        filterRulesChain.addFilterRule(new JPredicate<OldHistoryState>() {
             @Override
-            public boolean apply(HistoryState object) {
+            public boolean apply(OldHistoryState object) {
                 return object == null || Strings.isEmpty(object.getEditorState().getText());
             }
         });
@@ -401,7 +401,7 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
     }
 
     @Nonnull
-    protected abstract List<HistoryState> getHistoryItems();
+    protected abstract List<OldHistoryState> getHistoryItems();
 
     protected abstract void clearHistory();
 

app/src/main/java/org/solovyev/android/calculator/history/CalculatorHistory.java

@@ -22,42 +22,204 @@
 
 package org.solovyev.android.calculator.history;
 
-import org.solovyev.android.calculator.CalculatorEventListener;
+import android.content.SharedPreferences;
+import android.text.TextUtils;
+import com.squareup.otto.Subscribe;
+import org.solovyev.android.Check;
+import org.solovyev.android.calculator.*;
+import org.solovyev.common.history.HistoryAction;
 import org.solovyev.common.history.HistoryHelper;
-
+import org.solovyev.common.history.SimpleHistoryHelper;
-import java.util.List;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
 
-/**
+public class CalculatorHistory {
- * User: Solovyev_S
- * Date: 20.09.12
- * Time: 16:11
- */
-public interface CalculatorHistory extends HistoryHelper<HistoryState>, CalculatorEventListener {
 
-    void load();
+    private final AtomicInteger counter = new AtomicInteger(0);
-
-    void save();
-
-    void fromXml(@Nonnull String xml);
-
-    String toXml();
-
-    void clearSavedHistory();
-
-    void removeSavedHistory(@Nonnull HistoryState historyState);
 
     @Nonnull
-    List<HistoryState> getSavedHistory();
+    private final HistoryHelper<OldHistoryState> history = SimpleHistoryHelper.newInstance();
 
     @Nonnull
-    HistoryState addSavedState(@Nonnull HistoryState historyState);
+    private final OldHistory savedOldHistory = new OldHistory();
+
+    @Nullable
+    private EditorState lastEditorState;
+
+    public CalculatorHistory() {
+        App.getBus().register(this);
+        App.getInitializer().execute(new Runnable() {
+            @Override
+            public void run() {
+                init();
+            }
+        });
+    }
+
+    private void init() {
+        Check.isNotMainThread();
+        migrateOldHistory();
+    }
+
+    private void migrateOldHistory() {
+        final SharedPreferences preferences = App.getPreferences();
+        final String xml = preferences.getString("org.solovyev.android.calculator.CalculatorModel_history", null);
+        if (TextUtils.isEmpty(xml)) {
+            return;
+        }
+        final OldHistory history = OldHistory.fromXml(xml);
+        if (history == null) {
+            // strange, history seems to be broken. Avoid clearing the preference
+            return;
+        }
+        for (OldHistoryState state : history.getItems()) {
+            state.setSaved(true);
+            state.setId(counter.incrementAndGet());
+            savedOldHistory.add(state);
+        }
+    }
+
+    public boolean isEmpty() {
+        Check.isMainThread();
+        return history.isEmpty();
+    }
+
+    public boolean isActionAvailable(@Nonnull HistoryAction action) {
+        Check.isMainThread();
+        return history.isActionAvailable(action);
+    }
+
+    public OldHistoryState doAction(@Nonnull HistoryAction action, @Nullable OldHistoryState state) {
+        Check.isMainThread();
+        return history.doAction(action, state);
+    }
+
+    public void addState(@Nullable OldHistoryState currentState) {
+        Check.isMainThread();
+        history.addState(currentState);
+        Locator.getInstance().getCalculator().fireCalculatorEvent(CalculatorEventType.history_state_added, currentState);
+    }
 
     @Nonnull
-    List<HistoryState> getStates();
+    public List<OldHistoryState> getStates() {
+        Check.isMainThread();
+        return history.getStates();
+    }
 
     @Nonnull
-    List<HistoryState> getStates(boolean includeIntermediateStates);
+    public List<OldHistoryState> getStates(boolean includeIntermediateStates) {
+        Check.isMainThread();
+            if (includeIntermediateStates) {
+                return getStates();
+            } else {
+                final List<OldHistoryState> states = getStates();
 
+                final List<OldHistoryState> result = new LinkedList<>();
+
+                OldHistoryState laterState = null;
+                for (OldHistoryState state : org.solovyev.common.collections.Collections.reversed(states)) {
+                    if (laterState != null) {
+                        final String laterEditorText = laterState.getEditorState().getText();
+                        final String editorText = state.getEditorState().getText();
+                        if (laterEditorText != null && editorText != null && isIntermediate(laterEditorText, editorText)) {
+                            // intermediate result => skip from add
+                        } else {
+                            result.add(0, state);
+                        }
+                    } else {
+                        result.add(0, state);
+                    }
+
+                    laterState = state;
+                }
+
+                return result;
+            }
+        }
+
+    private boolean isIntermediate(@Nonnull String laterEditorText,
+                                   @Nonnull String editorText) {
+        if (Math.abs(laterEditorText.length() - editorText.length()) <= 1) {
+            if (laterEditorText.length() > editorText.length()) {
+                return laterEditorText.startsWith(editorText);
+            } else {
+                return editorText.startsWith(laterEditorText);
+            }
+        }
+
+        return false;
+    }
+
+    public void clear() {
+        Check.isMainThread();
+        history.clear();
+    }
+
+    @Nonnull
+    public List<OldHistoryState> getSavedOldHistory() {
+        return Collections.unmodifiableList(savedOldHistory.getItems());
+    }
+
+    @Nonnull
+    public OldHistoryState addSavedState(@Nonnull OldHistoryState state) {
+        if (state.isSaved()) {
+            return state;
+        } else {
+            final OldHistoryState savedState = state.clone();
+
+            savedState.setId(counter.incrementAndGet());
+            savedState.setSaved(true);
+
+            savedOldHistory.add(savedState);
+
+            return savedState;
+        }
+    }
+
+    public void load() {
+    }
+
+    public void save() {
+        final SharedPreferences settings = App.getPreferences();
+        final SharedPreferences.Editor editor = settings.edit();
+        editor.putString("org.solovyev.android.calculator.CalculatorModel_history", toXml());
+        editor.apply();
+    }
+
+    public String toXml() {
+        return savedOldHistory.toXml();
+    }
+
+    public void clearSavedHistory() {
+        savedOldHistory.clear();
+        save();
+    }
+
+    public void removeSavedHistory(@Nonnull OldHistoryState historyState) {
+        historyState.setSaved(false);
+        this.savedOldHistory.remove(historyState);
+        save();
+    }
+
+    @Subscribe
+    public void onEditorChanged(@Nonnull Editor.ChangedEvent e) {
+        lastEditorState = e.newState;
+    }
+
+    @Subscribe
+    public void onDisplayChanged(@Nonnull Display.ChangedEvent e) {
+        if (lastEditorState == null) {
+            return;
+        }
+        if (lastEditorState.sequence != e.newState.getSequence()) {
+            return;
+        }
+        addState(OldHistoryState.create(lastEditorState, e.newState));
+        lastEditorState = null;
+    }
 }

app/src/main/java/org/solovyev/android/calculator/history/CalculatorHistoryImpl.java

@@ -1,279 +0,0 @@
-/*
- * Copyright 2013 serso aka se.solovyev
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * Contact details
- *
- * Email: se.solovyev@gmail.com
- * Site:  http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator.history;
-
-import com.squareup.otto.Subscribe;
-import org.solovyev.android.calculator.*;
-import org.solovyev.common.history.HistoryAction;
-import org.solovyev.common.history.HistoryHelper;
-import org.solovyev.common.history.SimpleHistoryHelper;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-import java.util.Collections;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.concurrent.atomic.AtomicInteger;
-
-import static org.solovyev.android.calculator.CalculatorEventType.manual_calculation_requested;
-
-public class CalculatorHistoryImpl implements CalculatorHistory {
-
-    private final AtomicInteger counter = new AtomicInteger(0);
-
-    @Nonnull
-    private final HistoryHelper<HistoryState> history = SimpleHistoryHelper.newInstance();
-
-    @Nonnull
-    private final History savedHistory = new History();
-
-    @Nonnull
-    private final CalculatorEventHolder lastEventData = new CalculatorEventHolder(CalculatorUtils.createFirstEventDataId());
-
-    @Nullable
-    private EditorState lastEditorState;
-
-    public CalculatorHistoryImpl(@Nonnull Calculator calculator) {
-        calculator.addCalculatorEventListener(this);
-        App.getBus().register(this);
-    }
-
-    @Override
-    public boolean isEmpty() {
-        synchronized (history) {
-            return this.history.isEmpty();
-        }
-    }
-
-    @Override
-    public HistoryState getLastHistoryState() {
-        synchronized (history) {
-            return this.history.getLastHistoryState();
-        }
-    }
-
-    @Override
-    public boolean isUndoAvailable() {
-        synchronized (history) {
-            return history.isUndoAvailable();
-        }
-    }
-
-    @Override
-    public HistoryState undo(@Nullable HistoryState currentState) {
-        synchronized (history) {
-            return history.undo(currentState);
-        }
-    }
-
-    @Override
-    public boolean isRedoAvailable() {
-        return history.isRedoAvailable();
-    }
-
-    @Override
-    public HistoryState redo(@Nullable HistoryState currentState) {
-        synchronized (history) {
-            return history.redo(currentState);
-        }
-    }
-
-    @Override
-    public boolean isActionAvailable(@Nonnull HistoryAction historyAction) {
-        synchronized (history) {
-            return history.isActionAvailable(historyAction);
-        }
-    }
-
-    @Override
-    public HistoryState doAction(@Nonnull HistoryAction historyAction, @Nullable HistoryState currentState) {
-        synchronized (history) {
-            return history.doAction(historyAction, currentState);
-        }
-    }
-
-    @Override
-    public void addState(@Nullable HistoryState currentState) {
-        synchronized (history) {
-            history.addState(currentState);
-            Locator.getInstance().getCalculator().fireCalculatorEvent(CalculatorEventType.history_state_added, currentState);
-        }
-    }
-
-    @Nonnull
-    @Override
-    public List<HistoryState> getStates() {
-        synchronized (history) {
-            return history.getStates();
-        }
-    }
-
-    @Nonnull
-    @Override
-    public List<HistoryState> getStates(boolean includeIntermediateStates) {
-        synchronized (history) {
-            if (includeIntermediateStates) {
-                return getStates();
-            } else {
-                final List<HistoryState> states = getStates();
-
-                final List<HistoryState> result = new LinkedList<HistoryState>();
-
-                HistoryState laterState = null;
-                for (HistoryState state : org.solovyev.common.collections.Collections.reversed(states)) {
-                    if (laterState != null) {
-                        final String laterEditorText = laterState.getEditorState().getText();
-                        final String editorText = state.getEditorState().getText();
-                        if (laterEditorText != null && editorText != null && isIntermediate(laterEditorText, editorText)) {
-                            // intermediate result => skip from add
-                        } else {
-                            result.add(0, state);
-                        }
-                    } else {
-                        result.add(0, state);
-                    }
-
-                    laterState = state;
-                }
-
-                return result;
-            }
-        }
-    }
-
-    private boolean isIntermediate(@Nonnull String laterEditorText,
-                                   @Nonnull String editorText) {
-        if (Math.abs(laterEditorText.length() - editorText.length()) <= 1) {
-            if (laterEditorText.length() > editorText.length()) {
-                return laterEditorText.startsWith(editorText);
-            } else {
-                return editorText.startsWith(laterEditorText);
-            }
-        }
-
-        return false;
-    }
-
-    @Override
-    public void clear() {
-        synchronized (history) {
-            this.history.clear();
-        }
-    }
-
-    @Override
-    @Nonnull
-    public List<HistoryState> getSavedHistory() {
-        return Collections.unmodifiableList(savedHistory.getItems());
-    }
-
-    @Override
-    @Nonnull
-    public HistoryState addSavedState(@Nonnull HistoryState historyState) {
-        if (historyState.isSaved()) {
-            return historyState;
-        } else {
-            final HistoryState savedState = historyState.clone();
-
-            savedState.setId(counter.incrementAndGet());
-            savedState.setSaved(true);
-
-            savedHistory.add(savedState);
-
-            return savedState;
-        }
-    }
-
-    @Override
-    public void load() {
-        // todo serso: create saved/loader class
-    }
-
-    @Override
-    public void save() {
-        // todo serso: create saved/loader class
-    }
-
-    @Override
-    public void fromXml(@Nonnull String xml) {
-        clearSavedHistory();
-
-        final History history = History.fromXml(xml);
-        if (history == null) {
-            return;
-        }
-        for (HistoryState historyState : history.getItems()) {
-            historyState.setSaved(true);
-            historyState.setId(counter.incrementAndGet());
-            savedHistory.add(historyState);
-        }
-    }
-
-    @Override
-    public String toXml() {
-        return savedHistory.toXml();
-    }
-
-    @Override
-    public void clearSavedHistory() {
-        savedHistory.clear();
-    }
-
-    @Override
-    public void removeSavedHistory(@Nonnull HistoryState historyState) {
-        this.savedHistory.remove(historyState);
-    }
-
-    @Subscribe
-    public void onEditorChanged(@Nonnull Editor.ChangedEvent e) {
-        lastEditorState = e.newState;
-    }
-
-    @Subscribe
-    public void onDisplayChanged(@Nonnull Display.ChangedEvent e) {
-        if (lastEditorState == null) {
-            return;
-        }
-        if (lastEditorState.sequence != e.newState.getSequence()) {
-            return;
-        }
-        addState(HistoryState.create(lastEditorState, e.newState));
-        lastEditorState = null;
-    }
-
-    @Override
-    public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData,
-                                  @Nonnull CalculatorEventType calculatorEventType,
-                                  @Nullable Object data) {
-        if (calculatorEventType.isOfType(manual_calculation_requested)) {
-            final CalculatorEventHolder.Result result = lastEventData.apply(calculatorEventData);
-            if (result.isNewAfter() && result.isNewSameOrAfterSequence()) {
-                switch (calculatorEventType) {
-                    case manual_calculation_requested:
-                        lastEditorState = (EditorState) data;
-                        break;
-                }
-            }
-        }
-    }
-}

app/src/main/java/org/solovyev/android/calculator/history/HistoryArrayAdapter.java

@@ -47,12 +47,12 @@ import static org.solovyev.android.calculator.history.BaseHistoryFragment.isAlre
  * Date: 12/18/11
  * Time: 7:39 PM
  */
-public class HistoryArrayAdapter extends ArrayAdapter<HistoryState> {
+public class HistoryArrayAdapter extends ArrayAdapter<OldHistoryState> {
 
     private static final int DATETIME_FORMAT = DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_MONTH | DateUtils.FORMAT_ABBREV_TIME;
     private boolean showDatetime;
 
-    HistoryArrayAdapter(Context context, int resource, int textViewResourceId, @Nonnull List<HistoryState> historyList, boolean showDatetime) {
+    HistoryArrayAdapter(Context context, int resource, int textViewResourceId, @Nonnull List<OldHistoryState> historyList, boolean showDatetime) {
         super(context, resource, textViewResourceId, historyList);
         this.showDatetime = showDatetime;
     }
@@ -61,7 +61,7 @@ public class HistoryArrayAdapter extends ArrayAdapter<HistoryState> {
     public View getView(int position, View convertView, ViewGroup parent) {
         final ViewGroup result = (ViewGroup) super.getView(position, convertView, parent);
 
-        final HistoryState state = getItem(position);
+        final OldHistoryState state = getItem(position);
 
         final TextView time = (TextView) result.findViewById(R.id.history_time);
         if (showDatetime) {

app/src/main/java/org/solovyev/android/calculator/history/HistoryFragment.java

@@ -22,19 +22,14 @@
 
 package org.solovyev.android.calculator.history;
 
-import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
-
 import org.solovyev.android.calculator.CalculatorFragmentType;
 import org.solovyev.android.calculator.Locator;
-import org.solovyev.android.calculator.Preferences;
 import org.solovyev.android.calculator.R;
 
+import javax.annotation.Nonnull;
 import java.util.ArrayList;
 import java.util.List;
 
-import javax.annotation.Nonnull;
-
 public class HistoryFragment extends BaseHistoryFragment {
 
     public HistoryFragment() {
@@ -48,11 +43,8 @@ public class HistoryFragment extends BaseHistoryFragment {
 
     @Nonnull
     @Override
-    protected List<HistoryState> getHistoryItems() {
+    protected List<OldHistoryState> getHistoryItems() {
-        final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
+        return new ArrayList<>(Locator.getInstance().getHistory().getStates(false));
-        final boolean showIntermediateCalculations = Preferences.History.showIntermediateCalculations.getPreference(preferences);
-        final List<HistoryState> historyStates = Locator.getInstance().getHistory().getStates(showIntermediateCalculations);
-        return new ArrayList<HistoryState>(historyStates);
     }
 
     @Override

app/src/main/java/org/solovyev/android/calculator/history/HistoryItemMenuData.java

@@ -34,23 +34,23 @@ import javax.annotation.Nonnull;
 public class HistoryItemMenuData {
 
     @Nonnull
-    private final ArrayAdapter<HistoryState> adapter;
+    private final ArrayAdapter<OldHistoryState> adapter;
 
     @Nonnull
-    private final HistoryState historyState;
+    private final OldHistoryState historyState;
 
-    public HistoryItemMenuData(@Nonnull HistoryState historyState, ArrayAdapter<HistoryState> adapter) {
+    public HistoryItemMenuData(@Nonnull OldHistoryState historyState, ArrayAdapter<OldHistoryState> adapter) {
         this.historyState = historyState;
         this.adapter = adapter;
     }
 
     @Nonnull
-    public HistoryState getHistoryState() {
+    public OldHistoryState getHistoryState() {
         return historyState;
     }
 
     @Nonnull
-    public ArrayAdapter<HistoryState> getAdapter() {
+    public ArrayAdapter<OldHistoryState> getAdapter() {
         return adapter;
     }
 }

app/src/main/java/org/solovyev/android/calculator/history/HistoryUtils.java

@@ -1,32 +0,0 @@
-/*
- * Copyright 2013 serso aka se.solovyev
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * Contact details
- *
- * Email: se.solovyev@gmail.com
- * Site:  http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator.history;
-
-final class HistoryUtils {
-
-    // not intended for instantiation
-    private HistoryUtils() {
-        throw new AssertionError();
-    }
-
-}

app/src/main/java/org/solovyev/android/calculator/history/OldDisplayHistoryState.java

@@ -35,8 +35,8 @@ import org.solovyev.common.text.Strings;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-@Root
+@Root(name = "DisplayHistoryState")
-public class DisplayHistoryState implements Cloneable {
+public class OldDisplayHistoryState implements Cloneable {
 
     @Transient
     private boolean valid = true;
@@ -47,7 +47,7 @@ public class DisplayHistoryState implements Cloneable {
 
     @Element
     @Nonnull
-    private EditorHistoryState editorState;
+    private OldEditorHistoryState editorState;
 
     @Element
     @Nonnull
@@ -57,15 +57,15 @@ public class DisplayHistoryState implements Cloneable {
     @Nullable
     private Generic genericResult;
 
-    private DisplayHistoryState() {
+    private OldDisplayHistoryState() {
         // for xml
     }
 
     @Nonnull
-    public static DisplayHistoryState newInstance(@Nonnull DisplayState viewState) {
+    public static OldDisplayHistoryState newInstance(@Nonnull DisplayState viewState) {
-        final DisplayHistoryState result = new DisplayHistoryState();
+        final OldDisplayHistoryState result = new OldDisplayHistoryState();
 
-        result.editorState = EditorHistoryState.create(viewState);
+        result.editorState = OldEditorHistoryState.create(viewState);
 
         result.valid = viewState.isValid();
         result.jsclOperation = viewState.getOperation();
@@ -89,7 +89,7 @@ public class DisplayHistoryState implements Cloneable {
     }
 
     @Nonnull
-    public EditorHistoryState getEditorState() {
+    public OldEditorHistoryState getEditorState() {
         return editorState;
     }
 
@@ -114,7 +114,7 @@ public class DisplayHistoryState implements Cloneable {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
 
-        DisplayHistoryState that = (DisplayHistoryState) o;
+        OldDisplayHistoryState that = (OldDisplayHistoryState) o;
 
         if (!editorState.equals(that.editorState)) return false;
         if (jsclOperation != that.jsclOperation) return false;
@@ -140,9 +140,9 @@ public class DisplayHistoryState implements Cloneable {
     }
 
     @Override
-    protected DisplayHistoryState clone() {
+    protected OldDisplayHistoryState clone() {
         try {
-            final DisplayHistoryState clone = (DisplayHistoryState) super.clone();
+            final OldDisplayHistoryState clone = (OldDisplayHistoryState) super.clone();
 
             clone.editorState = this.editorState.clone();
 

app/src/main/java/org/solovyev/android/calculator/history/OldEditorHistoryState.java

@@ -32,8 +32,8 @@ import org.solovyev.common.text.Strings;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-@Root
+@Root(name = "EditorHistoryState")
-public class EditorHistoryState implements Cloneable {
+public class OldEditorHistoryState implements Cloneable {
 
     @Element
     private int cursorPosition;
@@ -42,13 +42,13 @@ public class EditorHistoryState implements Cloneable {
     @Nullable
     private String text = "";
 
-    private EditorHistoryState() {
+    private OldEditorHistoryState() {
         // for xml
     }
 
     @Nonnull
-    public static EditorHistoryState create(@Nonnull EditorState state) {
+    public static OldEditorHistoryState create(@Nonnull EditorState state) {
-        final EditorHistoryState result = new EditorHistoryState();
+        final OldEditorHistoryState result = new OldEditorHistoryState();
 
         result.text = state.getTextString();
         result.cursorPosition = state.selection;
@@ -57,8 +57,8 @@ public class EditorHistoryState implements Cloneable {
     }
 
     @Nonnull
-    public static EditorHistoryState create(@Nonnull DisplayState viewState) {
+    public static OldEditorHistoryState create(@Nonnull DisplayState viewState) {
-        final EditorHistoryState result = new EditorHistoryState();
+        final OldEditorHistoryState result = new OldEditorHistoryState();
 
         result.text = viewState.getText();
         result.cursorPosition = viewState.getSelection();
@@ -83,9 +83,9 @@ public class EditorHistoryState implements Cloneable {
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof EditorHistoryState)) return false;
+        if (!(o instanceof OldEditorHistoryState)) return false;
 
-        EditorHistoryState that = (EditorHistoryState) o;
+        OldEditorHistoryState that = (OldEditorHistoryState) o;
 
         if (cursorPosition != that.cursorPosition) return false;
         if (text != null ? !text.equals(that.text) : that.text != null) return false;
@@ -109,9 +109,9 @@ public class EditorHistoryState implements Cloneable {
     }
 
     @Override
-    protected EditorHistoryState clone() {
+    protected OldEditorHistoryState clone() {
         try {
-            return (EditorHistoryState) super.clone();
+            return (OldEditorHistoryState) super.clone();
         } catch (CloneNotSupportedException e) {
             throw new UnsupportedOperationException(e);
         }

app/src/main/java/org/solovyev/android/calculator/history/OldHistory.java

@@ -34,24 +34,24 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
-@Root
+@Root(name = "History")
-public class History {
+public class OldHistory {
 
     @Nonnull
-    @ElementList(type = HistoryState.class, name = "historyItems")
+    @ElementList(type = OldHistoryState.class, name = "historyItems")
-    private List<HistoryState> items = new ArrayList<HistoryState>();
+    private List<OldHistoryState> items = new ArrayList<OldHistoryState>();
 
-    public History() {
+    public OldHistory() {
     }
 
     @Nullable
-    public static History fromXml(@Nullable String xml) {
+    public static OldHistory fromXml(@Nullable String xml) {
         if (xml == null) {
             return null;
         }
         final Serializer serializer = new Persister();
         try {
-            return serializer.read(History.class, xml);
+            return serializer.read(OldHistory.class, xml);
         } catch (Exception e) {
             return null;
         }
@@ -70,15 +70,15 @@ public class History {
     }
 
     @Nonnull
-    public List<HistoryState> getItems() {
+    public List<OldHistoryState> getItems() {
         return items;
     }
 
-    public void add(@Nonnull HistoryState state) {
+    public void add(@Nonnull OldHistoryState state) {
         items.add(state);
     }
 
-    public void addAll(@Nonnull Collection<HistoryState> states) {
+    public void addAll(@Nonnull Collection<OldHistoryState> states) {
         items.addAll(states);
     }
 
@@ -86,7 +86,7 @@ public class History {
         items.clear();
     }
 
-    public void remove(@Nonnull HistoryState state) {
+    public void remove(@Nonnull OldHistoryState state) {
         items.remove(state);
     }
 }

app/src/main/java/org/solovyev/android/calculator/history/OldHistoryState.java

@@ -31,46 +31,46 @@ import org.solovyev.android.calculator.EditorState;
 
 import javax.annotation.Nonnull;
 
-@Root
+@Root(name = "HistoryState")
-public class HistoryState extends BaseHistoryState {
+public class OldHistoryState extends BaseHistoryState {
 
     @Element
     @Nonnull
-    private EditorHistoryState editorState;
+    private OldEditorHistoryState editorState;
 
     @Element
     @Nonnull
-    private DisplayHistoryState displayState;
+    private OldDisplayHistoryState displayState;
 
-    private HistoryState() {
+    private OldHistoryState() {
         // for xml
     }
 
-    private HistoryState(@Nonnull EditorHistoryState editorState,
+    private OldHistoryState(@Nonnull OldEditorHistoryState editorState,
-                         @Nonnull DisplayHistoryState displayState) {
+                            @Nonnull OldDisplayHistoryState displayState) {
         this.editorState = editorState;
         this.displayState = displayState;
     }
 
     @Nonnull
-    public static HistoryState create(@Nonnull Editor editor,
+    public static OldHistoryState create(@Nonnull Editor editor,
                                       @Nonnull Display display) {
         return create(editor.getState(), display.getState());
     }
 
     @Nonnull
-    public static HistoryState create(@Nonnull EditorState editorState,
+    public static OldHistoryState create(@Nonnull EditorState editorState,
                                       @Nonnull DisplayState displayState) {
-        return new HistoryState(EditorHistoryState.create(editorState), DisplayHistoryState.newInstance(displayState));
+        return new OldHistoryState(OldEditorHistoryState.create(editorState), OldDisplayHistoryState.newInstance(displayState));
     }
 
     @Nonnull
-    public EditorHistoryState getEditorState() {
+    public OldEditorHistoryState getEditorState() {
         return editorState;
     }
 
     @Nonnull
-    public DisplayHistoryState getDisplayState() {
+    public OldDisplayHistoryState getDisplayState() {
         return displayState;
     }
 
@@ -87,7 +87,7 @@ public class HistoryState extends BaseHistoryState {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
 
-        HistoryState that = (HistoryState) o;
+        OldHistoryState that = (OldHistoryState) o;
 
         if (this.isSaved() != that.isSaved()) return false;
         if (this.getId() != that.getId()) return false;
@@ -112,8 +112,8 @@ public class HistoryState extends BaseHistoryState {
     }
 
     @Override
-    protected HistoryState clone() {
+    protected OldHistoryState clone() {
-        final HistoryState that = (HistoryState) super.clone();
+        final OldHistoryState that = (OldHistoryState) super.clone();
 
         that.editorState = this.editorState.clone();
         that.displayState = this.displayState.clone();

app/src/main/java/org/solovyev/android/calculator/history/SavedHistoryFragment.java

@@ -44,8 +44,8 @@ public class SavedHistoryFragment extends BaseHistoryFragment {
 
     @Nonnull
     @Override
-    protected List<HistoryState> getHistoryItems() {
+    protected List<OldHistoryState> getHistoryItems() {
-        return new ArrayList<HistoryState>(Locator.getInstance().getHistory().getSavedHistory());
+        return new ArrayList<OldHistoryState>(Locator.getInstance().getHistory().getSavedOldHistory());
     }
 
     @Override

app/src/main/res/values/styles.xml

@@ -294,6 +294,7 @@
     <style name="CppListView">
         <item name="android:id">@android:id/list</item>
         <item name="android:dividerHeight">1px</item>
+        <item name="android:divider">@drawable/divider</item>
         <item name="android:cacheColorHint">@android:color/transparent</item>
         <item name="android:layout_height">match_parent</item>
         <item name="android:layout_width">match_parent</item>

app/src/test/java/org/solovyev/android/calculator/history/CalculatorHistoryTest.java

@@ -25,21 +25,19 @@ package org.solovyev.android.calculator.history;
 import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;
+import org.solovyev.android.calculator.CalculatorTestUtils;
 import org.solovyev.android.calculator.DisplayState;
 import org.solovyev.android.calculator.EditorState;
-import org.solovyev.android.calculator.CalculatorTestUtils;
-import org.solovyev.android.calculator.Locator;
-
-import java.util.List;
 
 import javax.annotation.Nonnull;
+import java.util.List;
 
 /**
  * User: Solovyev_S
  * Date: 10.10.12
  * Time: 15:07
  */
-public class CalculatorHistoryImplTest {
+public class CalculatorHistoryTest {
 
     @BeforeClass
     public static void setUp() throws Exception {
@@ -48,7 +46,7 @@ public class CalculatorHistoryImplTest {
 
     @Test
     public void testGetStates() throws Exception {
-        CalculatorHistory calculatorHistory = new CalculatorHistoryImpl(Locator.getInstance().getCalculator());
+        CalculatorHistory calculatorHistory = new CalculatorHistory();
 
         addState(calculatorHistory, "1");
         addState(calculatorHistory, "12");
@@ -64,13 +62,13 @@ public class CalculatorHistoryImplTest {
         addState(calculatorHistory, "2354");
         addState(calculatorHistory, "23547");
 
-        final List<HistoryState> states = calculatorHistory.getStates(false);
+        final List<OldHistoryState> states = calculatorHistory.getStates(false);
         Assert.assertEquals(2, states.size());
         Assert.assertEquals("23547", states.get(1).getEditorState().getText());
         Assert.assertEquals("123+3", states.get(0).getEditorState().getText());
     }
 
     private void addState(@Nonnull CalculatorHistory calculatorHistory, @Nonnull String text) {
-        calculatorHistory.addState(HistoryState.create(EditorState.create(text, 3), DisplayState.empty()));
+        calculatorHistory.addState(OldHistoryState.create(EditorState.create(text, 3), DisplayState.empty()));
     }
 }

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

@@ -135,13 +135,13 @@ public class HistoryUtilsTest {
     public void testToXml() throws Exception {
         final Date date = new Date(100000000);
 
-        HistoryHelper<HistoryState> history = SimpleHistoryHelper.newInstance();
+        HistoryHelper<OldHistoryState> history = SimpleHistoryHelper.newInstance();
 
         DisplayState calculatorDisplay = DisplayState.createError(JsclOperation.simplify, "Error", EditorState.NO_SEQUENCE);
 
         EditorState calculatorEditor = EditorState.create("1+1", 3);
 
-        HistoryState state = HistoryState.create(calculatorEditor, calculatorDisplay);
+        OldHistoryState state = OldHistoryState.create(calculatorEditor, calculatorDisplay);
         state.setTime(date.getTime());
         history.addState(state);
 
@@ -156,7 +156,7 @@ public class HistoryUtilsTest {
 
         calculatorEditor = EditorState.create("5/6", 2);
 
-        state = HistoryState.create(calculatorEditor, calculatorDisplay);
+        state = OldHistoryState.create(calculatorEditor, calculatorDisplay);
         state.setSaved(true);
         state.setTime(date.getTime());
         history.addState(state);
@@ -165,7 +165,7 @@ public class HistoryUtilsTest {
 
         calculatorEditor = EditorState.create("", 1);
 
-        state = HistoryState.create(calculatorEditor, calculatorDisplay);
+        state = OldHistoryState.create(calculatorEditor, calculatorDisplay);
         state.setSaved(true);
         state.setTime(date.getTime());
         history.addState(state);
@@ -174,7 +174,7 @@ public class HistoryUtilsTest {
 
         calculatorEditor = EditorState.create("4+5/35sin(41)+dfdsfsdfs", 0);
 
-        state = HistoryState.create(calculatorEditor, calculatorDisplay);
+        state = OldHistoryState.create(calculatorEditor, calculatorDisplay);
         state.setSaved(true);
         state.setTime(date.getTime());
         history.addState(state);
@@ -182,28 +182,28 @@ public class HistoryUtilsTest {
         String xml = createHistory(history).toXml();
         assertEquals(toXml2, xml);
 
-        final HistoryHelper<HistoryState> historyFromXml = SimpleHistoryHelper.newInstance();
+        final HistoryHelper<OldHistoryState> historyFromXml = SimpleHistoryHelper.newInstance();
-        final History actual = History.fromXml(xml);
+        final OldHistory actual = OldHistory.fromXml(xml);
-        for (HistoryState historyState : actual.getItems()) {
+        for (OldHistoryState historyState : actual.getItems()) {
             historyFromXml.addState(historyState);
         }
 
         assertEquals(history.getStates().size(), historyFromXml.getStates().size());
 
-        for (HistoryState historyState : history.getStates()) {
+        for (OldHistoryState historyState : history.getStates()) {
             historyState.setId(0);
             historyState.setSaved(true);
         }
-        for (HistoryState historyState : historyFromXml.getStates()) {
+        for (OldHistoryState historyState : historyFromXml.getStates()) {
             historyState.setId(0);
             historyState.setSaved(true);
         }
-        Assert.assertTrue(Objects.areEqual(history.getStates(), historyFromXml.getStates(), new CollectionEqualizer<HistoryState>(null)));
+        Assert.assertTrue(Objects.areEqual(history.getStates(), historyFromXml.getStates(), new CollectionEqualizer<OldHistoryState>(null)));
     }
 
     @Nonnull
-    private History createHistory(HistoryHelper<HistoryState> history) {
+    private OldHistory createHistory(HistoryHelper<OldHistoryState> history) {
-        final History result = new History();
+        final OldHistory result = new OldHistory();
         result.addAll(history.getStates());
         return result;
     }