Source for javax.swing.text.Segment

   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., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 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 implements Cloneable, CharacterIterator
  43: {
  44:   private boolean partialReturn;
  45:   private int current;
  46:   
  47:   public char[] array;
  48:   public int count;
  49:   public int offset;
  50: 
  51:   public Segment()
  52:   {
  53:     // Nothing to do here.
  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: }