1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.maven.index.cli;
20
21 import java.lang.reflect.InvocationHandler;
22 import java.lang.reflect.InvocationTargetException;
23 import java.lang.reflect.Method;
24
25 /**
26 * An {@link java.lang.reflect.InvocationHandler} that can be extended with methods from the proxied interface. While
27 * invocation it will look for a method within itself that matches the signature of the invoked proxy method. If found
28 * the method will be invoked and result returned, otherwise an {@link UnsupportedOperationException} will be thrown.
29 *
30 * @author Alin Dreghiciu
31 */
32 public class PartialImplementation implements InvocationHandler {
33
34 public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
35 try {
36 final Method localMethod = getClass().getMethod(method.getName(), method.getParameterTypes());
37 return localMethod.invoke(this, args);
38 } catch (NoSuchMethodException | IllegalAccessException e) {
39 throw new UnsupportedOperationException("Method " + method.getName() + "() is not supported");
40 } catch (InvocationTargetException e) {
41 throw e.getCause();
42 }
43 }
44 }