Constant evaluation support

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/MapState.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/MapState.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/MapState.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/MapState.java
new file mode 100644
index 0000000000000000000000000000000000000000..9dc46c358b62cb5fe29f927686f81a9efff8a3fa
--- /dev/null
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/object/MapState.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2013, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
+ * 
+ * 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.
+ */
+package com.google.dart.engine.internal.object;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * The unique instance of the class {@code ListState} represents the state of an object representing
+ * a map.
+ */
+public class MapState extends InstanceState {
+  /**
+   * The entries in the map.
+   */
+  private HashMap<DartObjectImpl, DartObjectImpl> entries;
+
+  /**
+   * Initialize a newly created state to represent a map with the given entries.
+   * 
+   * @param entries the entries in the map
+   */
+  public MapState(HashMap<DartObjectImpl, DartObjectImpl> entries) {
+    this.entries = entries;
+  }
+
+  @Override
+  public StringState convertToString() {
+    return StringState.UNKNOWN_VALUE;
+  }
+
+  @Override
+  public boolean equals(Object object) {
+    if (!(object instanceof MapState)) {
+      return false;
+    }
+    HashMap<DartObjectImpl, DartObjectImpl> otherElements = ((MapState) object).entries;
+    int count = entries.size();
+    if (otherElements.size() != count) {
+      return false;
+    } else if (count == 0) {
+      return true;
+    }
+    for (Map.Entry<DartObjectImpl, DartObjectImpl> entry : entries.entrySet()) {
+      DartObjectImpl key = entry.getKey();
+      DartObjectImpl value = entry.getValue();
+      DartObjectImpl otherValue = otherElements.get(key);
+      if (!value.equals(otherValue)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @Override
+  public BoolState equalEqual(InstanceState rightOperand) throws EvaluationException {
+    assertBoolNumStringOrNull(rightOperand);
+    if (rightOperand instanceof DynamicState) {
+      return BoolState.UNKNOWN_VALUE;
+    }
+    return BoolState.from(equals(rightOperand));
+  }
+
+  @Override
+  public String getTypeName() {
+    return "Map"; //$NON-NLS-0$
+  }
+
+  @Override
+  public int hashCode() {
+    int value = 0;
+    for (DartObjectImpl key : entries.keySet()) {
+      value = (value << 3) ^ key.hashCode();
+    }
+    return value;
+  }
+}