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/*
* Copyright (C) 2007 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.common.collect;
import java.io.Serializable;
import java.util.Map;
/**
* A map entry which forwards all its method calls to another map entry.
* Subclasses should override one or more methods to modify the behavior of the
* backing map entry as desired per the decorator pattern.
*
* Unlike most {@code Forwarding} classes, this class does not implement
* {@link Serializable}, since it usually decorates a map entry that shouldn't
* be serialized.
*
* @see ForwardingObject
* @author Mike Bostock
*/
public abstract class ForwardingMapEntry
extends NonSerializableForwardingObject implements Map.Entry {
/**
* Constructs a forwarding map entry that forwards to the provided delegate.
*/
protected ForwardingMapEntry(Map.Entry delegate) {
super(delegate);
}
@SuppressWarnings("unchecked")
@Override protected Map.Entry delegate() {
return (Map.Entry) super.delegate();
}
public K getKey() {
return delegate().getKey();
}
public V getValue() {
return delegate().getValue();
}
public V setValue(V value) {
return delegate().setValue(value);
}
@Override public boolean equals(Object obj) {
return delegate().equals(obj);
}
@Override public int hashCode() {
return delegate().hashCode();
}
}