001/*
002 * (C) Copyright 2006-2009 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.platform.ui.web.cache;
023
024import java.util.LinkedHashMap;
025import java.util.Map;
026
027/**
028 * Inner class to manage LRU cache clean up.
029 *
030 * @author tiry
031 */
032public class LRUCachingMap<K, V> extends LinkedHashMap<K, V> {
033
034    private static final long serialVersionUID = 1L;
035
036    private final int maxCachedItems;
037
038    public LRUCachingMap(int maxCachedItems) {
039        super(maxCachedItems, 1.0f, true);
040        this.maxCachedItems = maxCachedItems;
041    }
042
043    @Override
044    protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
045        return size() > maxCachedItems;
046    }
047
048}