| /* |
| * 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; |
| |
| /** |
| * Transformer implementation that calls a Closure using the input object |
| * and then returns the input. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:33 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public class ClosureTransformer implements Transformer, Serializable { |
| |
| /** Serial version UID */ |
| private static final long serialVersionUID = 478466901448617286L; |
| |
| /** The closure to wrap */ |
| private final Closure iClosure; |
| |
| /** |
| * Factory method that performs validation. |
| * |
| * @param closure the closure to call, not null |
| * @return the <code>closure</code> transformer |
| * @throws IllegalArgumentException if the closure is null |
| */ |
| public static Transformer getInstance(Closure closure) { |
| if (closure == null) { |
| throw new IllegalArgumentException("Closure must not be null"); |
| } |
| return new ClosureTransformer(closure); |
| } |
| |
| /** |
| * Constructor that performs no validation. |
| * Use <code>getInstance</code> if you want that. |
| * |
| * @param closure the closure to call, not null |
| */ |
| public ClosureTransformer(Closure closure) { |
| super(); |
| iClosure = closure; |
| } |
| |
| /** |
| * Transforms the input to result by executing a closure. |
| * |
| * @param input the input object to transform |
| * @return the transformed result |
| */ |
| public Object transform(Object input) { |
| iClosure.execute(input); |
| return input; |
| } |
| |
| /** |
| * Gets the closure. |
| * |
| * @return the closure |
| * @since Commons Collections 3.1 |
| */ |
| public Closure getClosure() { |
| return iClosure; |
| } |
| |
| } |