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Java > Open Source Codes > org > apache > avalon > cornerstone > blocks > masterstore > ClassLoaderObjectInputStream


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation
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
12  * implied.
13  *
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 package org.apache.avalon.cornerstone.blocks.masterstore;
19
20 import java.io.IOException JavaDoc;
21 import java.io.InputStream JavaDoc;
22 import java.io.ObjectInputStream JavaDoc;
23 import java.io.ObjectStreamClass JavaDoc;
24 import java.io.StreamCorruptedException JavaDoc;
25
26 /**
27  * A special ObjectInputStream to handle highly transient classes hosted
28  * by Avalon components that are juggling many classloaders.
29  *
30  * @author <a HREF="mailto:paul_hammant@yahoo.com">Paul Hammant</a>
31  * @version $Revision: 1.1 $ $Date: 2004/03/15 15:42:05 $
32  */
33 public class ClassLoaderObjectInputStream
34     extends ObjectInputStream JavaDoc
35 {
36     private ClassLoader JavaDoc m_classLoader;
37
38     public ClassLoaderObjectInputStream( final ClassLoader JavaDoc classLoader,
39                                          final InputStream JavaDoc inputStream )
40         throws IOException JavaDoc, StreamCorruptedException JavaDoc
41     {
42         super( inputStream );
43         m_classLoader = classLoader;
44     }
45
46     protected Class JavaDoc resolveClass( final ObjectStreamClass JavaDoc objectStreamClass )
47         throws IOException JavaDoc, ClassNotFoundException JavaDoc
48     {
49         final Class JavaDoc clazz =
50             Class.forName( objectStreamClass.getName(), false, m_classLoader );
51
52         if( null != clazz )
53         {
54             return clazz; // the classloader knows of the class
55 }
56         else
57         {
58             // classloader knows not of class, let the super classloader do it
59 return super.resolveClass( objectStreamClass );
60         }
61     }
62 }
63
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