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Java > Open Source Codes > org > ungoverned > oscar > util > ObjectInputStreamX


1 /*
2  * Oscar - An implementation of the OSGi framework.
3  * Copyright (c) 2004, Richard S. Hall
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * * Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  * * Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in
14  * the documentation and/or other materials provided with the
15  * distribution.
16  * * Neither the name of the ungoverned.org nor the names of its
17  * contributors may be used to endorse or promote products derived
18  * from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  *
32  * Contact: Richard S. Hall (heavy@ungoverned.org)
33  * Contributor(s):
34  *
35 **/
36 package org.ungoverned.oscar.util;
37
38 import java.io.*;
39
40 /**
41  * The ObjectInputStreamX class is a simple extension to the ObjectInputStream
42  * class. The purpose of ObjectInputStreamX is to allow objects to be deserialized
43  * when their classes are not in the CLASSPATH (e.g., in a JAR file).
44  */
45 public class ObjectInputStreamX extends ObjectInputStream
46 {
47     private ClassLoader JavaDoc m_loader = null;
48
49     /**
50      * Construct an ObjectInputStreamX for the specified InputStream and the specified
51      * ClassLoader.
52      * @param in the input stream to read.
53      * @param loader the class loader used to resolve classes.
54      */
55     public ObjectInputStreamX(InputStream in, ClassLoader JavaDoc loader)
56         throws IOException, StreamCorruptedException
57     {
58         super(in);
59         this.m_loader = loader;
60     }
61
62     /**
63      * By overloading this method, the ObjectInputStreamX can resolve a class
64      * from the class loader that was passed into it at construction time.
65      */
66     protected Class JavaDoc resolveClass(ObjectStreamClass v)
67         throws IOException, ClassNotFoundException JavaDoc
68     {
69         Class JavaDoc clazz = m_loader.loadClass(v.getName());
70         return clazz;
71     }
72 }
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