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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" 
13   * BASIS, 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  package org.apache.jetspeed.components.portletregistry;
18  
19  import java.lang.reflect.InvocationHandler;
20  import java.lang.reflect.InvocationTargetException;
21  import java.lang.reflect.Method;
22  import java.lang.reflect.Proxy;
23  
24  import org.apache.jetspeed.om.common.portlet.MutablePortletApplication;
25  
26  public class MutablePortletApplicationProxy implements InvocationHandler, PortletApplicationProxy
27  {
28      private MutablePortletApplication app = null;
29      private static PortletRegistry registry;
30      private String name;
31      
32      public MutablePortletApplicationProxy(MutablePortletApplication app)
33      {
34          this.app = app;
35          this.name = app.getName();
36      }
37  
38      public static void setRegistry(PortletRegistry r)
39      {
40          registry = r;
41      }
42      
43      public static MutablePortletApplication createProxy(
44              MutablePortletApplication app)
45      {
46          Class[] proxyInterfaces = new Class[]
47          { MutablePortletApplication.class, PortletApplicationProxy.class};
48          MutablePortletApplication proxy = (MutablePortletApplication) Proxy
49                  .newProxyInstance(MutablePortletApplication.class
50                          .getClassLoader(), proxyInterfaces,
51                          new MutablePortletApplicationProxy(app));
52          return proxy;
53      }
54  
55      protected void invalidate()
56      {
57          this.app = null;
58      }
59      
60      public void setRealApplication(MutablePortletApplication app)
61      {
62          this.app = app;
63      }
64      
65      public MutablePortletApplication getRealApplication()
66      {
67          return app;
68      }
69      
70      public Object invoke(Object proxy, Method m, Object[] args)
71              throws Throwable
72      {
73          try 
74          {
75              if (m.getName().equals("getRealApplication"))
76              {
77                  return getRealApplication();
78              }
79              else if (m.getName().equals("setRealApplication"))
80              {
81                  setRealApplication((MutablePortletApplication)args[0]);
82                  return null;
83              }
84              else
85              {
86                  if (app == null)
87                  {
88                      app = registry.getPortletApplication(name);
89                  }
90                  return m.invoke(app, args);
91              }
92          } 
93          catch (InvocationTargetException e) 
94          {
95              throw e.getTargetException();
96          }
97      }
98  
99  }