libjava/javax/swing/text/GapContent.java

   1 /* GapContent.java --
   2    Copyright (C) 2002, 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package javax.swing.text;
  40
  41 import java.io.Serializable;
  42
  43 // too lazy to make a real gapcontent.
  44 // lets just use a stringbuffer instead.
  45 import javax.swing.undo.UndoableEdit;
  46
  47 public class GapContent
  48   implements AbstractDocument.Content, Serializable
  49 {
  50   private static final long serialVersionUID = 8374645204155842629L;
  51
  52   StringBuffer buf = new StringBuffer();
  53
  54   public GapContent()
  55   {
  56     this(10);
  57   }
  58
  59   public GapContent(int size)
  60   {
  61     buf.append("\n");
  62   }
  63
  64   public Position createPosition(final int offset) throws BadLocationException
  65   {
  66     return new Position()
  67       {
  68         int off = offset;
  69
  70         public int getOffset()
  71         {
  72           return off;
  73         }
  74       };
  75   }
  76
  77   public int length()
  78   {
  79     return buf.length();
  80   }
  81
  82   public UndoableEdit insertString(int where, String str)
  83     throws BadLocationException
  84   {
  85     buf.insert(where, str);
  86     return null;
  87   }
  88
  89   public UndoableEdit remove(int where, int nitems)
  90     throws BadLocationException
  91   {
  92     buf.delete(where, where + nitems);
  93     return null;
  94   }
  95
  96   public String getString(int where, int len) throws BadLocationException
  97   {
  98     return buf.substring(where, where+len);
  99   }
 100
 101   public void getChars(int where, int len, Segment txt)
 102     throws BadLocationException
 103   {
 104     txt.array = new char[len];
 105
 106     System.arraycopy(buf.toString().toCharArray(), where, txt.array, 0, len);
 107
 108     txt.count = len;
 109     txt.offset = 0;
 110   }
 111 }