- /*
- * 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.collections.functors;
-
- import java.io.Serializable;
-
- import org.apache.commons.collections.Transformer;
-
- /**
- * Transformer implementation that does nothing.
- *
- * @since Commons Collections 3.0
- * @version $Revision: 1.6 $ $Date: 2004/05/16 11:36:31 $
- *
- * @author Stephen Colebourne
- */
- public class NOPTransformer implements Transformer, 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 Transformer 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 Object transform(Object input) {
- return input;
- }
-
- }