001package org.apache.commons.jcs.utils.struct;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.io.Serializable;
023import java.util.Map.Entry;
024
025/**
026 * Entry for the LRUMap.
027 * <p>
028 * @author Aaron Smuts
029 */
030public class LRUMapEntry<K, V>
031    implements Entry<K, V>, Serializable
032{
033    /** Don't change */
034    private static final long serialVersionUID = -8176116317739129331L;
035
036    /** key */
037    private final K key;
038
039    /** value */
040    private V value;
041
042    /**
043     * S
044     * @param key
045     * @param value
046     */
047    public LRUMapEntry(K key, V value)
048    {
049        this.key = key;
050        this.value = value;
051    }
052
053    /**
054     * @return key
055     */
056    @Override
057    public K getKey()
058    {
059        return this.key;
060    }
061
062    /**
063     * @return value
064     */
065    @Override
066    public V getValue()
067    {
068        return this.value;
069    }
070
071    /**
072     * @param valueArg
073     * @return the old value
074     */
075    @Override
076    public V setValue(V valueArg)
077    {
078        V old = this.value;
079        this.value = valueArg;
080        return old;
081    }
082}