PassThroughInvocationHandler


1   /* 
2    * Copyright 2003-2004 The Apache Software Foundation
3    * Licensed  under the  Apache License,  Version 2.0  (the "License");
4    * you may not use  this file  except in  compliance with the License.
5    * You may obtain a copy of the License at 
6    * 
7    *   http://www.apache.org/licenses/LICENSE-2.0
8    * 
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed  under the  License is distributed on an "AS IS" BASIS,
11   * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
12   * implied.
13   * 
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.avalon.fortress.impl.factory;
19  
20  import java.lang.reflect.InvocationHandler  ;
21  import java.lang.reflect.InvocationTargetException  ;
22  import java.lang.reflect.Method  ;
23  
24  /**
25   * InvocationHandler that just passes on all methods to target object.
26   *
27   * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
28   */
29  final class PassThroughInvocationHandler
30      implements InvocationHandler  
31  {
32      /**
33       * The target object delegated to.
34       */
35      private final Object   m_object;
36  
37      /**
38       * Create an Invocation handler for specified object.
39       *
40       * @param object the object to delegate to
41       */
42      public PassThroughInvocationHandler( final Object   object )
43      {
44          if ( null == object )
45          {
46              throw new NullPointerException  ( "object" );
47          }
48  
49          m_object = object;
50      }
51  
52      /**
53       * Invoke the appropriate method on underlying object.
54       *
55       * @param proxy the proxy object
56       * @param meth the method
57       * @param args the arguments
58       * @return the return value of object
59       * @exception Throwable method throws an exception
60       */
61      public Object   invoke( final Object   proxy,
62                            final Method   meth,
63                            final Object  [] args )
64          throws Throwable  
65      {
66          try
67          {
68              return meth.invoke( m_object, args );
69          }
70          catch ( final InvocationTargetException   ite )
71          {
72              throw ite.getTargetException();
73          }
74      }
75  
76      /**
77       * Retrieve the underlying object delegated to.
78       *
79       * @return the object delegated to
80       */
81      Object   getObject()
82      {
83          return m_object;
84      }
85  }
86
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