LRULinkedHashMap.java

/*
 * Copyright (c) 2013 Big Switch Networks, Inc.
 *
 * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/legal/epl-v10.html
 *
 * 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.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *    Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior University 
 *
 *    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 org.openflow.util;

import java.util.LinkedHashMap;

public class LRULinkedHashMap<K, V> extends LinkedHashMap<K, V> {
    private static final long serialVersionUID = -2964986094089626647L;
    protected int maximumCapacity;

    public LRULinkedHashMap(int initialCapacity, int maximumCapacity) {
        super(initialCapacity, 0.75f, true);
        this.maximumCapacity = maximumCapacity;
    }

    public LRULinkedHashMap(int maximumCapacity) {
        super(16, 0.75f, true);
        this.maximumCapacity = maximumCapacity;
    }

    @Override
    protected boolean removeEldestEntry(java.util.Map.Entry<K, V> eldest) {
        if (this.size() > maximumCapacity)
            return true;
        return false;
    }
}