package org.apache.maven.index.cli;

 /*

  * 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.

  */

 import java.lang.reflect.InvocationHandler;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 /**

  * An {@link java.lang.reflect.InvocationHandler} that can be extended with methods from the proxied interface. While

  * invocation it will look for a method within itself that matches the signature of the invoked proxy method. If found

  * the method will be invoked and result returned, otherwise an {@link UnsupportedOperationException} will be thrown.

  * 

  * @author Alin Dreghiciu

  */

 public class PartialImplementation

     implements InvocationHandler

 {

     public Object invoke( final Object proxy, final Method method, final Object[] args )

         throws Throwable

     {

         try

         {

             final Method localMethod = getClass().getMethod( method.getName(), method.getParameterTypes() );

             return localMethod.invoke( this, args );

         }

         catch ( NoSuchMethodException e )

         {

             throw new UnsupportedOperationException( "Method " + method.getName() + "() is not supported" );

         }

         catch ( IllegalAccessException e )

         {

             throw new UnsupportedOperationException( "Method " + method.getName() + "() is not supported" );

         }

         catch ( InvocationTargetException e )

         {

             throw e.getCause();

         }

     }

 }