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Java > Open Source Codes > JFlex > StdOutWriter


1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
2  * JFlex 1.4.1 *
3  * Copyright (C) 1998-2004 Gerwin Klein <lsf@jflex.de> *
4  * All rights reserved. *
5  * *
6  * This program is free software; you can redistribute it and/or modify *
7  * it under the terms of the GNU General Public License. See the file *
8  * COPYRIGHT for more information. *
9  * *
10  * This program is distributed in the hope that it will be useful, *
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13  * GNU General Public License for more details. *
14  * *
15  * You should have received a copy of the GNU General Public License along *
16  * with this program; if not, write to the Free Software Foundation, Inc., *
17  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
18  * *
19  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
20
21 package JFlex;
22
23
24 import java.io.*;
25 import java.awt.TextArea JavaDoc;
26
27
28 /**
29  * Convenience class for JFlex stdout, redirects output to a TextArea
30  * if in GUI mode.
31  *
32  * @author Gerwin Klein
33  * @version JFlex 1.4.1, $Revision: 2.4 $, $Date: 2004/11/06 23:03:30 $
34  */
35 public final class StdOutWriter extends PrintWriter {
36   
37   /** text area to write to if in gui mode, gui mode = (text != null) */
38   private TextArea JavaDoc text;
39
40   /**
41    * approximation of the current column in the text area
42    * for auto wrapping at <code>wrap</code> characters
43    **/
44   private int col;
45  
46   /** auto wrap lines in gui mode at this value */
47   private final static int wrap = 78;
48
49   /** A StdOutWriter, attached to System.out, no gui mode */
50   public StdOutWriter() {
51     super(System.out,true);
52   }
53   
54   /** A StdOutWrite, attached to the specified output stream, no gui mode */
55   public StdOutWriter(OutputStream out) {
56     super(out,true);
57   }
58
59   /**
60    * Set the TextArea to write text to. Will continue
61    * to write to System.out if text is <code>null</code>.
62    *
63    * @param text the TextArea to write to
64    */
65   public void setGUIMode(TextArea JavaDoc text) {
66     this.text = text;
67   }
68
69   /** Write a single character. */
70   public void write(int c) {
71     if (text != null) {
72       text.append(String.valueOf((char) c));
73       if (++col > wrap) println();
74     }
75     else
76       super.write(c);
77   }
78
79   /** Write a portion of an array of characters. */
80   public void write(char buf[], int off, int len) {
81     if (text != null) {
82       text.append(new String JavaDoc(buf,off,len));
83       if ((col+=len) > wrap) println();
84     }
85     else
86       super.write(buf, off, len);
87   }
88   
89   /** Write a portion of a string. */
90   public void write(String JavaDoc s, int off, int len) {
91     if (text != null) {
92       text.append(s.substring(off,off+len));
93       if ((col+=len) > wrap) println();
94     }
95     else {
96       super.write(s,off,len);
97       flush();
98     }
99   }
100
101   /**
102    * Begin a new line. Which actual character/s is/are written
103    * depends on the runtime platform.
104    */
105   public void println() {
106     if (text != null) {
107       text.append(Out.NL);
108       col = 0;
109     }
110     else
111       super.println();
112   }
113 }
114
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