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Commons Collections example source code file (TransformedSortedBag.java)

This example Commons Collections source code file (TransformedSortedBag.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, object, object, sortedbag, sortedbag, transformedbag, transformedsortedbag, transformedsortedbag, transformer, transformer, util

The Commons Collections TransformedSortedBag.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.bag;

import java.util.Comparator;

import org.apache.commons.collections.SortedBag;
import org.apache.commons.collections.Transformer;

/**
 * Decorates another <code>SortedBag to transform objects that are added.
 * <p>
 * The add methods are affected by this class.
 * Thus objects must be removed or searched for using their transformed form.
 * For example, if the transformation converts Strings to Integers, you must
 * use the Integer form to remove objects.
 * <p>
 * This class is Serializable from Commons Collections 3.1.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Stephen Colebourne
 */
public class TransformedSortedBag
        extends TransformedBag implements SortedBag {

    /** Serialization version */
    private static final long serialVersionUID = -251737742649401930L;

    /**
     * Factory method to create a transforming sorted bag.
     * <p>
     * If there are any elements already in the bag being decorated, they
     * are NOT transformed.
     * 
     * @param bag  the bag to decorate, must not be null
     * @param transformer  the transformer to use for conversion, must not be null
     * @return a new transformed SortedBag
     * @throws IllegalArgumentException if bag or transformer is null
     */
    public static SortedBag decorate(SortedBag bag, Transformer transformer) {
        return new TransformedSortedBag(bag, transformer);
    }
    
    //-----------------------------------------------------------------------
    /**
     * Constructor that wraps (not copies).
     * <p>
     * If there are any elements already in the bag being decorated, they
     * are NOT transformed.
     * 
     * @param bag  the bag to decorate, must not be null
     * @param transformer  the transformer to use for conversion, must not be null
     * @throws IllegalArgumentException if bag or transformer is null
     */
    protected TransformedSortedBag(SortedBag bag, Transformer transformer) {
        super(bag, transformer);
    }

    /**
     * Gets the decorated bag.
     * 
     * @return the decorated bag
     */
    protected SortedBag getSortedBag() {
        return (SortedBag) collection;
    }

    //-----------------------------------------------------------------------
    public Object first() {
        return getSortedBag().first();
    }

    public Object last() {
        return getSortedBag().last();
    }

    public Comparator comparator() {
        return getSortedBag().comparator();
    }

}

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