LRUMap.java

/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.util;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author Brian Wing Shun Chan
 */
public class LRUMap<K, V> extends LinkedHashMap<K, V> {

	public LRUMap(int capacity) {
		super(capacity * 3 / 2, 0.75F, true);

		_capacity = capacity;
	}

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

	private final int _capacity;

}