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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.proxy.invoker;
19  
20  import org.apache.commons.proxy.Invoker;
21  import org.apache.commons.proxy.exception.InvokerException;
22  import org.apache.xmlrpc.XmlRpcException;
23  import org.apache.xmlrpc.XmlRpcHandler;
24  
25  import java.lang.reflect.Method;
26  import java.util.Vector;
27  
28  /**
29   * Uses <a href="http://ws.apache.org/xmlrpc/">Apache XML-RPC</a> to invoke methods on an XML-RPC service.
30   *
31   * <p>
32   * <b>Dependencies</b>:
33   * <ul>
34   *   <li>Apache XML-RPC version 2.0 or greater</li>
35   * </ul>
36   * </p>
37   * @author James Carman
38   * @since 1.0
39   */
40  public class XmlRpcInvoker implements Invoker
41  {
42      private final XmlRpcHandler handler;
43      private final String handlerName;
44  
45      public XmlRpcInvoker( XmlRpcHandler handler, String handlerName )
46      {
47          this.handler = handler;
48          this.handlerName = handlerName;
49      }
50  
51      public Object invoke( Object proxy, Method method, Object[] args ) throws Throwable
52      {
53          final Object returnValue = handler.execute( handlerName + "." + method.getName(), toArgumentVector( args ) );
54          if( returnValue instanceof XmlRpcException )
55          {
56              throw new InvokerException( "Unable to execute XML-RPC call.", ( XmlRpcException )returnValue );
57  
58          }
59          return returnValue;
60      }
61  
62      private Vector toArgumentVector( Object[] args )
63      {
64          final Vector v = new Vector();
65          for( int i = 0; i < args.length; i++ )
66          {
67              Object arg = args[i];
68              v.addElement( arg );
69          }
70          return v;
71      }
72  }