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1   /**********************************************************************
2    * JavaBeansXmlAdapter.java
3    * created on 10.03.2005 by netseeker
4    * $Source: /cvsroot/ejoe/EJOE/src/de/netseeker/ejoe/adapter/JavaBeansXmlAdapter.java,v $
5    * $Date: 2007/05/27 22:13:09 $
6    * $Revision: 1.17 $
7    *
8    * ====================================================================
9    *
10   *  Copyright 2005-2006 netseeker aka Michael Manske
11   *
12   *  Licensed under the Apache License, Version 2.0 (the "License");
13   *  you may not use this file except in compliance with the License.
14   *  You may obtain a copy of the License at
15   *
16   *      http://www.apache.org/licenses/LICENSE-2.0
17   *
18   *  Unless required by applicable law or agreed to in writing, software
19   *  distributed under the License is distributed on an "AS IS" BASIS,
20   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
21   *  See the License for the specific language governing permissions and
22   *  limitations under the License.
23   * ====================================================================
24   *
25   * This file is part of the ejoe framework.
26   * For more information on the author, please see
27   * <http://www.manskes.de/>.
28   *
29   *********************************************************************/
30  package de.netseeker.ejoe.adapter;
31  
32  import java.beans.ExceptionListener;
33  import java.beans.XMLDecoder;
34  import java.beans.XMLEncoder;
35  import java.io.InputStream;
36  import java.io.OutputStream;
37  import java.math.BigDecimal;
38  import java.math.BigInteger;
39  import java.util.logging.Level;
40  import java.util.logging.Logger;
41  
42  /***
43   * Simple SerializeAdapter implementation using the XmlEncoder/XmlDecoder classes of the Java Beans API
44   * 
45   * @author netseeker
46   */
47  public class JavaBeansXmlAdapter extends BaseAdapter implements ExceptionListener
48  {
49      private static final long   serialVersionUID = 1L;
50  
51      private static final Logger logger           = Logger.getLogger( JavaBeansXmlAdapter.class.getName() );
52  
53      /*
54       * (non-Javadoc)
55       * 
56       * @see de.netseeker.ejoe.adapter.SerializeAdapter#read(java.io.InputStream)
57       */
58      public Object read( InputStream in ) throws Exception
59      {
60          XMLDecoder decoder = new XMLDecoder( in );
61          decoder.setExceptionListener( this );
62          Object result = null;
63          try
64          {
65              // System.out.println("Read started!!! [" +
66              // Thread.currentThread().getName() + "]");
67              result = decoder.readObject();
68              // System.out.println("Read finished!!! [" +
69              // Thread.currentThread().getName() + "]");
70          }
71          finally
72          {
73              if ( decoder != null ) decoder.close();
74          }
75  
76          return result;
77      }
78  
79      /*
80       * (non-Javadoc)
81       * 
82       * @see de.netseeker.ejoe.adapter.SerializeAdapter#write(java.lang.Object, java.io.OutputStream)
83       */
84      public void write( Object obj, OutputStream out ) throws Exception
85      {
86          XMLEncoder encoder = new XMLEncoder( out );
87          encoder.setExceptionListener( this );
88          
89          try
90          {
91              // see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4426674
92              encoder.setPersistenceDelegate( BigInteger.class, encoder.getPersistenceDelegate( Integer.class ) );
93              encoder.setPersistenceDelegate( BigDecimal.class, encoder.getPersistenceDelegate( Integer.class ) );
94  
95              encoder.writeObject( obj );
96          }
97          finally
98          {
99              encoder.close();
100         }
101     }
102 
103     /*
104      * (non-Javadoc)
105      * 
106      * @see java.beans.ExceptionListener#exceptionThrown(java.lang.Exception)
107      */
108     public void exceptionThrown( Exception e )
109     {
110         logger.log( Level.WARNING, e.getMessage(), e );
111     }
112 
113     /* (non-Javadoc)
114      * @see de.netseeker.ejoe.adapter.BaseAdapter#requiresCustomEOFHandling()
115      */
116     public boolean requiresCustomEOFHandling()
117     {
118         return false;
119     }
120 
121     /* (non-Javadoc)
122      * @see de.netseeker.ejoe.adapter.BaseAdapter#isSelfBuffered()
123      */
124     public boolean isSelfBuffered()
125     {
126         return true;
127     }
128 
129     /*
130      * (non-Javadoc)
131      * 
132      * @see de.netseeker.ejoe.adapter.BaseAdapter#getContentType()
133      */
134     public String getContentType()
135     {
136         return "text/xml";
137     }
138 }