1 /***
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that the following conditions are
4 * met :
5 *
6 * . Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 *
9 * . Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * . The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $Id: ObjectOutput.java,v 1.7 2005/09/10 11:26:47 mat007 Exp $
29 */
30
31 package jtge.engine.io;
32
33 import java.io.IOException;
34 import java.io.ObjectOutputStream;
35 import java.io.OutputStream;
36 import jtge.engine.command.ICommand;
37
38 /***
39 * Implements an output implementation based on object serialization.
40 *
41 * @see <a href="http://java.sun.com/j2se/1.4.2/docs/guide/serialization/spec/output.html">Object Serialization
42 * Specification, Section 3, Object AbstractOutput Classes</a>
43 * @author Mathieu Champlon
44 * @version $Revision: 1.7 $ $Date: 2005/09/10 11:26:47 $
45 */
46 public class ObjectOutput implements IOutputImp
47 {
48 private final OutputStream stream;
49 private ObjectOutputStream output;
50 private boolean isClosed;
51
52 /***
53 * Create an output.
54 *
55 * @param stream the stream to read data from
56 */
57 public ObjectOutput( final OutputStream stream )
58 {
59 if( stream == null )
60 throw new IllegalArgumentException( "argument 'stream' is null" );
61 this.stream = stream;
62 isClosed = false;
63 }
64
65 /***
66 * {@inheritDoc}
67 */
68 public final void write( final ICommand command )
69 {
70 try
71 {
72 if( output == null )
73 output = new ObjectOutputStream( stream );
74 if( command != null )
75 output.writeObject( command );
76 }
77 catch( Exception e )
78 {
79 throw new InputOutputException( e );
80 }
81 }
82
83 /***
84 * {@inheritDoc}
85 */
86 public final void close()
87 {
88 try
89 {
90 isClosed = true;
91 if( output != null )
92 output.close();
93 stream.close();
94 }
95 catch( IOException e )
96 {
97 throw new InputOutputException( e );
98 }
99 }
100
101 /***
102 * {@inheritDoc}
103 */
104 public final boolean isClosed()
105 {
106 return isClosed;
107 }
108 }