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/*
 * 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
 * 
 * EnumMap bug. 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.
 *
 * 

This class is not thread-safe even if the underlying map is. * * @author Dimitris Andreou */ @GwtCompatible final class WellBehavedMap extends ForwardingMap { private final Map delegate; private Set> entrySet; private WellBehavedMap(Map delegate) { this.delegate = delegate; } /** * Wraps the given map into a {@code WellBehavedEntriesMap}, which * intercepts its {@code entrySet()} method by taking the * {@code Set keySet()} and transforming it to * {@code Set>}. All other invocations are delegated as-is. */ static WellBehavedMap wrap(Map delegate) { return new WellBehavedMap(delegate); } @Override protected Map delegate() { return delegate; } @Override public Set> entrySet() { Set> es = entrySet; if (es != null) { return es; } return entrySet = new EntrySet(); } private final class EntrySet extends Maps.EntrySet { @Override Map map() { return WellBehavedMap.this; } @Override public Iterator> iterator() { return new TransformedIterator>(keySet().iterator()) { @Override Entry transform(final K key) { return new AbstractMapEntry() { @Override public K getKey() { return key; } @Override public V getValue() { return get(key); } @Override public V setValue(V value) { return put(key, value); } }; } }; } } }





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