org.apache.commons.collections15.functors.NOPTransformer.java Source code

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Here is the source code for org.apache.commons.collections15.functors.NOPTransformer.java

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// GenericsNote: Converted.
/*
 *  Copyright 2001-2004 The Apache Software Foundation
 *
 *  Licensed 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.collections15.functors;

import org.apache.commons.collections15.Transformer;

import java.io.Serializable;

/**
 * Transformer implementation that does nothing.
 *
 * @author Matt Hall, John Watkinson, Stephen Colebourne
 * @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:24 $
 * @since Commons Collections 3.0
 */
public class NOPTransformer<I> implements Transformer<I, I>, Serializable {

    /**
     * Serial version UID
     */
    static final long serialVersionUID = 2133891748318574490L;

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

    /**
     * Factory returning the singleton instance.
     *
     * @return the singleton instance
     * @since Commons Collections 3.1
     */
    public static <T> Transformer<T, T> getInstance() {
        return INSTANCE;
    }

    /**
     * Constructor
     */
    private NOPTransformer() {
        super();
    }

    /**
     * Transforms the input to result by doing nothing.
     *
     * @param input the input object to transform
     * @return the transformed result which is the input
     */
    public I transform(I input) {
        return input;
    }

}