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  * Copyright (C) 2007 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.
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 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
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A concurrent map which forwards all its method calls to another concurrent map. Subclasses should override one or more methods to modify the behavior of the backing map as desired per the decorator pattern.

Charles Fry
2.0 (imported from Google Collections Library)
public abstract class ForwardingConcurrentMap<K, V> extends ForwardingMap<K, V>
    implements ConcurrentMap<K, V> {

Constructor for use by subclasses.
  protected ForwardingConcurrentMap() {}
  @Override protected abstract ConcurrentMap<K, V> delegate();
  public V putIfAbsent(K key, V value) {
    return delegate().putIfAbsent(keyvalue);
  public boolean remove(Object keyObject value) {
    return delegate().remove(keyvalue);
  public V replace(K key, V value) {
    return delegate().replace(keyvalue);
  public boolean replace(K key, V oldValue, V newValue) {
    return delegate().replace(keyoldValuenewValue);
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