| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.proxy2.invoker; |
| |
| import java.io.Serializable; |
| import java.lang.reflect.Method; |
| |
| import org.apache.commons.proxy2.Invoker; |
| import org.apache.commons.proxy2.ProxyUtils; |
| |
| /** |
| * An {@link Invoker} implementation which merely returns null for all method invocations. This class is useful for |
| * scenarios where the "null object" design pattern is needed. |
| * |
| * @since 1.0 |
| */ |
| public class NullInvoker implements Invoker, Serializable |
| { |
| /** Serialization version */ |
| private static final long serialVersionUID = 1L; |
| |
| /** |
| * Statically available instance. |
| */ |
| public static final NullInvoker INSTANCE = new NullInvoker(); |
| |
| //****************************************************************************************************************** |
| // Invoker Implementation |
| //****************************************************************************************************************** |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable |
| { |
| final Class<?> returnType = method.getReturnType(); |
| return ProxyUtils.nullValue(returnType); |
| } |
| } |