| /* |
| * 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.Closure; |
| import org.apache.commons.collections.Transformer; |
| |
| /** |
| * Closure implementation that calls a Transformer using the input object |
| * and ignore the result. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:33 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public class TransformerClosure implements Closure, Serializable { |
| |
| /** Serial version UID */ |
| private static final long serialVersionUID = -5194992589193388969L; |
| |
| /** The transformer to wrap */ |
| private final Transformer iTransformer; |
| |
| /** |
| * Factory method that performs validation. |
| * <p> |
| * A null transformer will return the <code>NOPClosure</code>. |
| * |
| * @param transformer the transformer to call, null means nop |
| * @return the <code>transformer</code> closure |
| */ |
| public static Closure getInstance(Transformer transformer) { |
| if (transformer == null) { |
| return NOPClosure.INSTANCE; |
| } |
| return new TransformerClosure(transformer); |
| } |
| |
| /** |
| * Constructor that performs no validation. |
| * Use <code>getInstance</code> if you want that. |
| * |
| * @param transformer the transformer to call, not null |
| */ |
| public TransformerClosure(Transformer transformer) { |
| super(); |
| iTransformer = transformer; |
| } |
| |
| /** |
| * Executes the closure by calling the decorated transformer. |
| * |
| * @param input the input object |
| */ |
| public void execute(Object input) { |
| iTransformer.transform(input); |
| } |
| |
| /** |
| * Gets the transformer. |
| * |
| * @return the transformer |
| * @since Commons Collections 3.1 |
| */ |
| public Transformer getTransformer() { |
| return iTransformer; |
| } |
| |
| } |