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Java > Open Source Codes > proguard > gui > TextAreaOutputStream


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.gui;
22
23 import java.io.*;
24
25 import javax.swing.*;
26
27
28 /**
29  * This <code>PrintStream</code> appends its output to a given text area.
30  *
31  * @author Eric Lafortune
32  */
33 class TextAreaOutputStream extends FilterOutputStream implements Runnable JavaDoc
34 {
35     private JTextArea textArea;
36
37
38     public TextAreaOutputStream(JTextArea textArea)
39     {
40         super(new ByteArrayOutputStream());
41
42         this.textArea = textArea;
43     }
44
45
46     // Implementation for FilterOutputStream.
47
48     public void flush() throws IOException
49     {
50         super.flush();
51
52         // Append the accumulated buffer contents to the text area.
53 SwingUtil.invokeAndWait(this);
54     }
55
56
57     // Implementation for Runnable.
58
59     public synchronized void run()
60     {
61         ByteArrayOutputStream out = (ByteArrayOutputStream)super.out;
62
63         // Has any new text been written?
64 String JavaDoc text = out.toString();
65         if (text.length() > 0)
66         {
67             // Append the accumulated text to the text area.
68 textArea.append(text);
69
70             // Clear the buffer.
71 out.reset();
72         }
73     }
74 }
75
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