content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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.apache.solr.util;
  
  import java.util.*;
  
  /**
   * A TreeSet that ensures it never grows beyond a max size.  
   * <code>last()</code> is removed if the <code>size()</code> 
   * get's bigger then <code>getMaxSize()</code>
   */
  public class BoundedTreeSet<E> extends TreeSet<E> {
    private int maxSize = Integer.MAX_VALUE;
    public BoundedTreeSet(int maxSize) {
      super();
      this.setMaxSize(maxSize);
    }
    public BoundedTreeSet(int maxSize, Collection<? extends E> c) {
      super(c);
      this.setMaxSize(maxSize);
    }
    public BoundedTreeSet(int maxSize, Comparator<? super E> c) {
      super(c);
      this.setMaxSize(maxSize);
    }
    public BoundedTreeSet(int maxSize, SortedSet<E> s) {
      super(s);
      this.setMaxSize(maxSize);
    }
    public int getMaxSize() {
      return maxSize;
    }
    public void setMaxSize(int max) {
      maxSize = max;
      adjust();
    }
    private void adjust() {
      while (maxSize < size()) {
        remove(last());
      }
    }
    @Override
    public boolean add(E item) {
      boolean out = super.add(item);
      adjust();
      return out;
    }
    @Override
    public boolean addAll(Collection<? extends E> c) {
      boolean out = super.addAll(c);
      adjust();
      return out;
    }
  }
  