org.apache.commons.collections.functors.CloneTransformer Maven / Gradle / Ivy
/*
* 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.
*
* Clone is performed using 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() {
super();
}
/**
* 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();
}
}