LRULinkedHashMap.java

/**
*    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;
    }
}