SizeLimitedMap.java

/*******************************************************************************
 * Copyright 2015 Klaus Pfeiffer <klaus@allpiper.com>
 *
 * 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 com.jfastnet.util;

import java.util.TreeMap;

/** @author Klaus Pfeiffer - klaus@allpiper.com */
public class SizeLimitedMap<K, V> extends TreeMap<K, V> {

	private int maximumSize;

	public SizeLimitedMap(int maximumSize) {
		this.maximumSize = maximumSize;
	}

	@Override
	public V put(K key, V value) {
		V put = super.put(key, value);
		checkSize();
		return put;
	}

	private void checkSize() {
		if (size() > maximumSize) {
			pollFirstEntry();
		}
	}
}