KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > wsif > base > WSIFObjectInputStream


1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 2002 The Apache Software Foundation. All rights
6  * reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
19  *
20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Apache Software Foundation (http://www.apache.org/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "WSIF" and "Apache Software Foundation" must
28  * not be used to endorse or promote products derived from this
29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
31  *
32  * 5. Products derived from this software may not be called "Apache",
33  * nor may "Apache" appear in their name, without prior written
34  * permission of the Apache Software Foundation.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  * ====================================================================
49  *
50  * This software consists of voluntary contributions made by many
51  * individuals on behalf of the Apache Software Foundation and was
52  * originally based on software copyright (c) 2001, 2002, International
53  * Business Machines, Inc., http://www.apache.org. For more
54  * information on the Apache Software Foundation, please see
55  * <http://www.apache.org/>.
56  */
57
58 package org.apache.wsif.base;
59
60 import java.io.*;
61
62 /**
63  * Class <code>FObjectInputStream</code> overloads the class <code>ObjectInputStream</code>
64  * to solve the bug reported under BugID
65  * <a HREF="http://developer.java.sun.com/developer/bugParade/bugs/4171142.html">4171142</a> .
66  * <br>
67  * If an object contains primitiv data types and you try to serialize/deserialize
68  * it than you will get an ClassNotFoundException for the primitiv data type.
69  * Reason for this exception is that the ObjectInputStream try to resolve the
70  * data type from java.lang.&lt;primitiv&gt; which does not work.
71  * <br>
72  * The solution for the problem is to override the method resolveClass and to
73  * bypass the resolution for primitiv data types.
74  *
75  * @author <a HREF="mailto:adietzsch@de.ibm.com?subject=FObjectInputStream">Alexander Dietzsch</a>
76  */
77 class WSIFObjectInputStream extends ObjectInputStream {
78   /**
79    * Create an ObjectInputStream that reads from the specified InputStream.
80    * The stream header containing the magic number and version number
81    * are read from the stream and verified. This method will block
82    * until the corresponding ObjectOutputStream has written and flushed the
83    * header.
84    *
85    * @param in the underlying <code>InputStream</code> from which to read
86    * @exception StreamCorruptedException The version or magic number are
87    * incorrect.
88    * @exception IOException An exception occurred in the underlying stream.
89    */
90   WSIFObjectInputStream (InputStream in)
91     throws IOException, StreamCorruptedException {
92
93     super(in);
94   }
95   /**
96    * Load the local class equivalent of the specified stream class description.
97    *
98    * Subclasses may implement this method to allow classes to be
99    * fetched from an alternate source.
100    *
101    * The corresponding method in ObjectOutputStream is
102    * annotateClass. This method will be invoked only once for each
103    * unique class in the stream. This method can be implemented by
104    * subclasses to use an alternate loading mechanism but must
105    * return a Class object. Once returned, the serialVersionUID of the
106    * class is compared to the serialVersionUID of the serialized class.
107    * If there is a mismatch, the deserialization fails and an exception
108    * is raised. <p>
109    *
110    * By default the class name is resolved relative to the class
111    * that called readObject. <p>
112    *
113    * @param v an instance of class ObjectStreamClass
114    * @return a Class object corresponding to <code>v</code>
115    * @exception IOException Any of the usual Input/Output exceptions.
116    * @exception ClassNotFoundException If class of
117    * a serialized object cannot be found.
118    */
119   protected Class JavaDoc resolveClass(ObjectStreamClass v)
120     throws IOException, ClassNotFoundException JavaDoc {
121
122     try {
123       // return super.resolveClass(v);
124 return Class.forName(v.getName(), true, Thread.currentThread().getContextClassLoader());
125     } catch (ClassNotFoundException JavaDoc xcpt) {
126      String JavaDoc className = v.getName() ;
127       if (className.equals("boolean")) { return boolean.class; }
128       if (className.equals("char")) { return char.class; }
129       if (className.equals("byte")) { return byte.class; }
130       if (className.equals("short")) { return short.class; }
131       if (className.equals("int")) { return int.class; }
132       if (className.equals("long")) { return long.class; }
133       if (className.equals("float")) { return float.class; }
134       if (className.equals("double")) { return double.class; }
135
136       throw xcpt;
137     }
138   }
139 }
140
Popular Tags