001/* 002 * (C) Copyright 2006-2009 Nuxeo SAS (http://nuxeo.com/) and contributors. 003 * 004 * All rights reserved. This program and the accompanying materials 005 * are made available under the terms of the GNU Lesser General Public License 006 * (LGPL) version 2.1 which accompanies this distribution, and is available at 007 * http://www.gnu.org/licenses/lgpl.html 008 * 009 * This library is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * Contributors: 015 * Nuxeo - initial API and implementation 016 * 017 * $Id$ 018 */ 019 020package org.nuxeo.ecm.platform.ui.web.cache; 021 022import java.util.LinkedHashMap; 023import java.util.Map; 024 025/** 026 * Inner class to manage LRU cache clean up. 027 * 028 * @author tiry 029 */ 030public class LRUCachingMap<K, V> extends LinkedHashMap<K, V> { 031 032 private static final long serialVersionUID = 1L; 033 034 private final int maxCachedItems; 035 036 public LRUCachingMap(int maxCachedItems) { 037 super(maxCachedItems, 1.0f, true); 038 this.maxCachedItems = maxCachedItems; 039 } 040 041 @Override 042 protected boolean removeEldestEntry(Map.Entry<K, V> eldest) { 043 return size() > maxCachedItems; 044 } 045 046}