Plotter

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

@@ -1,22 +1,55 @@
-package org.solovyev.android.calculator;
-
-import org.jetbrains.annotations.NotNull;
-
-/**
- * User: serso
- * Date: 9/22/12
- * Time: 7:13 PM
- */
-public final class CalculatorUtils {
-
-    static final long FIRST_ID = 0;
-
-    private CalculatorUtils() {
-        throw new AssertionError();
-    }
-
-    @NotNull
-    public static CalculatorEventData createFirstEventDataId() {
-        return CalculatorEventDataImpl.newInstance(FIRST_ID, FIRST_ID);
-    }
-}
+package org.solovyev.android.calculator;
+
+import jscl.math.Generic;
+import jscl.math.function.Constant;
+import jscl.math.function.IConstant;
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.jscl.JsclOperation;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 7:13 PM
+ */
+public final class CalculatorUtils {
+
+    static final long FIRST_ID = 0;
+
+    private CalculatorUtils() {
+        throw new AssertionError();
+    }
+
+    @NotNull
+    public static CalculatorEventData createFirstEventDataId() {
+        return CalculatorEventDataImpl.newInstance(FIRST_ID, FIRST_ID);
+    }
+
+    @NotNull
+    public static Set<Constant> getNotSystemConstants(@NotNull Generic expression) {
+        final Set<Constant> notSystemConstants = new HashSet<Constant>();
+
+        for (Constant constant : expression.getConstants()) {
+            IConstant var = CalculatorLocatorImpl.getInstance().getEngine().getVarsRegistry().get(constant.getName());
+            if (var != null && !var.isSystem() && !var.isDefined()) {
+                notSystemConstants.add(constant);
+            }
+        }
+
+        return notSystemConstants;
+    }
+
+    public static boolean isPlotPossible(@NotNull Generic expression, @NotNull JsclOperation operation) {
+        boolean result = false;
+
+        if (operation == JsclOperation.simplify) {
+            if (getNotSystemConstants(expression).size() == 1) {
+                result = true;
+            }
+        }
+
+        return result;
+    }
+}