/*
* JBoss, Home of Professional Open Source
* Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
package org.hibernate.search.util.impl;
import java.io.Serializable;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Copied from Hibernate Core's org.hibernate.util.LRUMap
* A simple LRU cache that implements the <code>Map</code> interface. Instances
* are not thread-safe and should be synchronized externally, for instance by
* using {@link java.util.Collections#synchronizedMap}.
*
* @author Manuel Dominguez Sarmiento
*/
public class LRUMap extends LinkedHashMap implements Serializable {
private static final long serialVersionUID = -2613234214057068628L;
private final int maxEntries;
public LRUMap(int maxEntries) {
super( maxEntries, .75f, true );
this.maxEntries = maxEntries;
}
protected boolean removeEldestEntry(Map.Entry eldest) {
return ( size() > maxEntries );
}
}