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Commons Collections example source code file (CloneTransformer.java)

This example Commons Collections source code file (CloneTransformer.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

clonetransformer, clonetransformer, instance, instance, io, object, object, serializable, transformer, transformer

The Commons Collections CloneTransformer.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.functors;

import java.io.Serializable;

import org.apache.commons.collections.Transformer;

 * Transformer implementation that returns a clone of the input object.
 * <p>
 * Clone is performed using <code>PrototypeFactory.getInstance(input).create().
 * @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 CloneTransformer implements Transformer, Serializable {

    /** Serial version UID */
    private static final long serialVersionUID = -8188742709499652567L;

    /** Singleton predicate instance */
    public static final Transformer INSTANCE = new CloneTransformer();

     * Factory returning the singleton instance.
     * @return the singleton instance
     * @since Commons Collections 3.1
    public static Transformer getInstance() {
        return INSTANCE;

     * Constructor
    private CloneTransformer() {

     * Transforms the input to result by cloning it.
     * @param input  the input object to transform
     * @return the transformed result
    public Object transform(Object input) {
        if (input == null) {
            return null;
        return PrototypeFactory.getInstance(input).create();


Other Commons Collections examples (source code examples)

Here is a short list of links related to this Commons Collections CloneTransformer.java source code file:

my book on functional programming


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