| /* |
| * 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.FunctorException; |
| import org.apache.commons.collections.Transformer; |
| |
| /** |
| * Transformer implementation that always throws an exception. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:33 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public final class ExceptionTransformer implements Transformer, Serializable { |
| |
| /** Serial version UID */ |
| private static final long serialVersionUID = 7179106032121985545L; |
| |
| |
| /** Singleton predicate instance */ |
| public static final Transformer INSTANCE = new ExceptionTransformer(); |
| |
| /** |
| * Factory returning the singleton instance. |
| * |
| * @return the singleton instance |
| * @since Commons Collections 3.1 |
| */ |
| public static Transformer getInstance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Restricted constructor. |
| */ |
| private ExceptionTransformer() { |
| super(); |
| } |
| |
| /** |
| * Transforms the input to result by cloning it. |
| * |
| * @param input the input object to transform |
| * @return never |
| * @throws FunctorException always |
| */ |
| public Object transform(Object input) { |
| throw new FunctorException("ExceptionTransformer invoked"); |
| } |
| |
| } |