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/*
* Copyright 2009 Google Inc.
*
* 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.gwt.core.client.impl;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* A class associating a (String, Object) map with arbitrary source objects
* (except for Strings). This implementation is used in Development Mode.
*/
public class WeakMapping {
/*
* This implementation is used in Development Mode only. It uses a HashMap to
* associate the (key, value) maps with source object instances. The object
* instances are wrapped in IdentityWeakReference objects in order to both
* allow the underlying objects to be garbage-collected and to apply
* IdentityHashMap semantics so that distinct objects that happen to compare
* as equals() still get to have distinct maps associated with them.
*/
/**
* A WeakReference implementing equals() and hashCode(). The hash code of the
* reference is permanently set to the identity hash code of the referent at
* construction time.
*/
static class IdentityWeakReference extends WeakReference