ClassFactoryClassLoader


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
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 implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.hivemind.service.impl;
16  
17  import java.util.ArrayList  ;
18  import java.util.List  ;
19  
20  /**
21   * ClassLoader used to properly instantiate newly created classes.
22   * 
23   * @author Howard Lewis Ship / Essl Christian
24   * @see org.apache.hivemind.service.impl.CtClassSource
25   */
26  class ClassFactoryClassLoader extends ClassLoader  
27  {
28      private List   _loaders = new ArrayList  ();
29  
30      public ClassFactoryClassLoader(ClassLoader   parent)
31      {
32          super(parent);
33      }
34  
35      /**
36       * Adds a delegate class loader to the list of delegate class loaders.
37       */
38      public synchronized void addDelegateLoader(ClassLoader   loader)
39      {
40          _loaders.add(loader);
41      }
42  
43      /**
44       * Searches each of the delegate class loaders for the given class.
45       */
46      protected synchronized Class   findClass(String   name) throws ClassNotFoundException  
47      {
48          int count = _loaders.size();
49          for (int i = 0; i < count; i++)
50          {
51              ClassLoader   l = (ClassLoader  ) _loaders.get(i);
52  
53              try
54              {
55                  return l.loadClass(name);
56              }
57              catch (ClassNotFoundException   ex)
58              {
59                  //
60              }
61          }
62  
63          throw new ClassNotFoundException  (name);
64      }}
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