Commons Collections example source code file (TreeBag.java)

This example Commons Collections source code file (TreeBag.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Collections tags/keywords

comparator, defaultmapbag, object, object, sortedbag, sortedmap, sortedmap, treebag, treebag, treemap, treemap, util

The Commons Collections TreeBag.java source code

/*
 *  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.commons.collections;

import java.util.Collection;
import java.util.Comparator;
import java.util.SortedMap;
import java.util.TreeMap;

/**
 * A {@link Bag} that is backed by a {@link TreeMap}. 
 * Order will be maintained among the unique representative
 * members.
 *
 * @deprecated Moved to bag subpackage and rewritten internally. Due to be removed in v4.0.
 * @since Commons Collections 2.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Chuck Burdick
 */
public class TreeBag extends DefaultMapBag implements SortedBag {

    /**
     * Constructs an empty <code>TreeBag.
     */
    public TreeBag() {
        super(new TreeMap());
    }

    /**
     * Constructs an empty {@link Bag} that maintains order on its unique
     * representative members according to the given {@link Comparator}.
     * 
     * @param comparator  the comparator to use
     */
    public TreeBag(Comparator comparator) {
        super(new TreeMap(comparator));
    }

    /**
     * Constructs a {@link Bag} containing all the members of the given
     * collection.
     * 
     * @param coll  the collection to copy into the bag
     */
    public TreeBag(Collection coll) {
        this();
        addAll(coll);
    }

    public Object first() {
        return ((SortedMap) getMap()).firstKey();
    }

    public Object last() {
        return ((SortedMap) getMap()).lastKey();
    }

    public Comparator comparator() {
        return ((SortedMap) getMap()).comparator();
    }
    
}