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1   package org.apache.turbine.util.pool;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.io.IOException;
23  import java.io.InputStream;
24  import java.io.ObjectInputStream;
25  import java.io.ObjectStreamClass;
26  
27  /***
28   * A deserialization stream for a specific class loader context.
29   *
30   * @author <a href="mailto:ilkka.priha@simsoft.fi">Ilkka Priha</a>
31   * @version $Id: ObjectInputStreamForContext.java 534527 2007-05-02 16:10:59Z tv $
32   */
33  public class ObjectInputStreamForContext extends ObjectInputStream
34  {
35      /***
36       * The class loader of the context.
37       */
38      private ClassLoader classLoader;
39  
40      /***
41       * Contructs a new object stream for a context.
42       *
43       * @param in the serialized input stream.
44       * @param loader the class loader of the context.
45       * @throws IOException on errors.
46       */
47      public ObjectInputStreamForContext(InputStream in,
48                                         ClassLoader loader)
49              throws IOException
50      {
51          super(in);
52          classLoader = loader;
53      }
54  
55      protected Class resolveClass(ObjectStreamClass v)
56              throws IOException,
57              ClassNotFoundException
58      {
59          return classLoader == null ?
60                  super.resolveClass(v) : classLoader.loadClass(v.getName());
61      }
62  }