1 files changed, 98 insertions, 0 deletions
diff --git a/guava/src/com/google/common/collect/WellBehavedMap.java b/guava/src/com/google/common/collect/WellBehavedMap.java
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+++ b/guava/src/com/google/common/collect/WellBehavedMap.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2011 The Guava Authors
+ *
+ * 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.
+ */
+
+package com.google.common.collect;
+
+import com.google.common.annotations.GwtCompatible;
+
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Workaround for
+ * <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6312706">
+ * EnumMap bug</a>. If you want to pass an {@code EnumMap}, with the
+ * intention of using its {@code entrySet()} method, you should
+ * wrap the {@code EnumMap} in this class instead.
+ *
+ * <p>This class is not thread-safe even if the underlying map is.
+ *
+ * @author Dimitris Andreou
+ */
+@GwtCompatible
+final class WellBehavedMap<K, V> extends ForwardingMap<K, V> {
+  private final Map<K, V> delegate;
+  private Set<Entry<K, V>> entrySet;
+
+  private WellBehavedMap(Map<K, V> delegate) {
+    this.delegate = delegate;
+  }
+
+  /**
+   * Wraps the given map into a {@code WellBehavedEntriesMap}, which
+   * intercepts its {@code entrySet()} method by taking the
+   * {@code Set<K> keySet()} and transforming it to
+   * {@code Set<Entry<K, V>>}. All other invocations are delegated as-is.
+   */
+  static <K, V> WellBehavedMap<K, V> wrap(Map<K, V> delegate) {
+    return new WellBehavedMap<K, V>(delegate);
+  }
+
+  @Override protected Map<K, V> delegate() {
+    return delegate;
+  }
+
+  @Override public Set<Entry<K, V>> entrySet() {
+    Set<Entry<K, V>> es = entrySet;
+    if (es != null) {
+      return es;
+    }
+    return entrySet = new EntrySet();
+  }
+
+  private final class EntrySet extends Maps.EntrySet<K, V> {
+    @Override
+    Map<K, V> map() {
+      return WellBehavedMap.this;
+    }
+
+    @Override
+    public Iterator<Entry<K, V>> iterator() {
+      return new TransformedIterator<K, Entry<K, V>>(keySet().iterator()) {
+        @Override
+        Entry<K, V> transform(final K key) {
+          return new AbstractMapEntry<K, V>() {
+            @Override
+            public K getKey() {
+              return key;
+            }
+
+            @Override
+            public V getValue() {
+              return get(key);
+            }
+
+            @Override
+            public V setValue(V value) {
+              return put(key, value);
+            }
+          };
+        }
+      };
+    }
+  }
+}