ObjectInputStreamForContext


1   package org.apache.turbine.util.pool;
2   
3   /*
4    * Copyright 2001-2004 The Apache Software Foundation.
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License")
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  import java.io.IOException  ;
20  import java.io.InputStream  ;
21  import java.io.ObjectInputStream  ;
22  import java.io.ObjectStreamClass  ;
23  
24  /**
25   * A deserialization stream for a specific class loader context.
26   *
27   * @author <a HREF="mailto:ilkka.priha@simsoft.fi">Ilkka Priha</a>
28   * @version $Id: ObjectInputStreamForContext.java,v 1.3.2.2 2004/05/20 03:25:50 seade Exp $
29   */
30  public class ObjectInputStreamForContext extends ObjectInputStream  
31  {
32      /**
33       * The class loader of the context.
34       */
35      private ClassLoader   classLoader;
36  
37      /**
38       * Contructs a new object stream for a context.
39       *
40       * @param in the serialized input stream.
41       * @param loader the class loader of the context.
42       * @throws IOException on errors.
43       */
44      public ObjectInputStreamForContext(InputStream   in,
45                                         ClassLoader   loader)
46              throws IOException  
47      {
48          super(in);
49          classLoader = loader;
50      }
51  
52      protected Class   resolveClass(ObjectStreamClass   v)
53              throws IOException  ,
54              ClassNotFoundException  
55      {
56          return classLoader == null ?
57                  super.resolveClass(v) : classLoader.loadClass(v.getName());
58      }
59  }
60
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