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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search licenses this
 * file to you 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.elasticsearch.util;

import java.util.Collection;
import java.util.Comparator;
import java.util.TreeSet;

/**
 * @author kimchy (Shay Banon)
 */
public class BoundedTreeSet extends TreeSet {

    private final int size;

    public BoundedTreeSet(int size) {
        this.size = size;
    }

    public BoundedTreeSet(Comparator comparator, int size) {
        super(comparator);
        this.size = size;
    }

    @Override public boolean add(E e) {
        boolean result = super.add(e);
        rebound();
        return result;
    }

    @Override public boolean addAll(Collection c) {
        boolean result = super.addAll(c);
        rebound();
        return result;
    }

    private void rebound() {
        while (size() > size) {
            remove(last());
        }
    }
}