libjava/javax/swing/text/Segment.java

   1 /* Segment.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 package javax.swing.text;
  39
  40 import java.text.CharacterIterator;
  41
  42 public class Segment
  43   implements Cloneable, CharacterIterator
  44 {
  45   private boolean partialReturn;
  46   private int current;
  47
  48   public char[] array;
  49   public int count;
  50   public int offset;
  51
  52   public Segment()
  53   {
  54   }
  55
  56   public Segment(char[] array, int offset, int count)
  57   {
  58     this.array = array;
  59     this.offset = offset;
  60     this.count = count;
  61   }
  62
  63   public Object clone()
  64   {
  65     try
  66       {
  67         return super.clone();
  68       }
  69     catch (CloneNotSupportedException e)
  70       {
  71         return null;
  72       }
  73   }
  74
  75   public char current()
  76   {
  77     if (count == 0
  78         || current >= getEndIndex())
  79       return DONE;
  80
  81     return array[current];
  82   }
  83
  84   public char first()
  85   {
  86     if (count == 0)
  87       return DONE;
  88
  89     current = getBeginIndex();
  90     return array[current];
  91   }
  92
  93   public int getBeginIndex()
  94   {
  95     return offset;
  96   }
  97
  98   public int getEndIndex()
  99   {
 100     return offset + count;
 101   }
 102
 103   public int getIndex()
 104   {
 105     return current;
 106   }
 107
 108   public char last()
 109   {
 110     if (count == 0)
 111       return DONE;
 112
 113     current = getEndIndex() - 1;
 114     return array[current];
 115   }
 116
 117   public char next()
 118   {
 119     if (count == 0)
 120       return DONE;
 121
 122     if ((current + 1) >= getEndIndex())
 123       {
 124         current = getEndIndex();
 125         return DONE;
 126       }
 127
 128     current++;
 129     return array[current];
 130   }
 131
 132   public char previous()
 133   {
 134     if (count == 0
 135         || current == getBeginIndex())
 136       return DONE;
 137
 138     current--;
 139     return array[current];
 140   }
 141
 142   public char setIndex(int position)
 143   {
 144     if (position < getBeginIndex()
 145         || position > getEndIndex())
 146       throw new IllegalArgumentException();
 147
 148     current = position;
 149
 150     if (position == getEndIndex())
 151       return DONE;
 152
 153     return array[current];
 154   }
 155
 156   public String toString()
 157   {
 158     return new String(array, offset, count);
 159   }
 160
 161   /**
 162    * @since 1.4
 163    */
 164   public void setPartialReturn(boolean p)
 165   {
 166     partialReturn = p;
 167   }
 168
 169   /**
 170    * @since 1.4
 171    */
 172   public boolean isPartialReturn()
 173   {
 174     return partialReturn;
 175   }
 176 }