libjava/java/nio/CharBufferImpl.java

   1 /* CharBufferImpl.java --
   2    Copyright (C) 2002, 2003 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 java.nio;
  40
  41 /**
  42  * This is a Heap memory implementation
  43  */
  44 final class CharBufferImpl extends CharBuffer
  45 {
  46   private boolean readOnly;
  47
  48   CharBufferImpl (int capacity)
  49   {
  50     this (new char [capacity], 0, capacity, capacity, 0, -1, false);
  51   }
  52
  53   CharBufferImpl (char[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly)
  54   {
  55     super (buffer, offset, capacity, limit, position, mark);
  56     this.readOnly = readOnly;
  57   }
  58
  59   public CharBufferImpl (CharBufferImpl copy)
  60   {
  61     super (copy.capacity (), copy.limit (), copy.position (), 0);
  62     backing_buffer = copy.backing_buffer;
  63     readOnly = copy.isReadOnly ();
  64   }
  65
  66   public boolean isReadOnly ()
  67   {
  68     return readOnly;
  69   }
  70
  71   public CharBuffer slice ()
  72   {
  73     return new CharBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ());
  74   }
  75
  76   public CharBuffer duplicate ()
  77   {
  78     return new CharBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ());
  79   }
  80
  81   public CharBuffer asReadOnlyBuffer ()
  82   {
  83     return new CharBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);
  84   }
  85
  86   public CharBuffer compact ()
  87   {
  88     int copied = 0;
  89
  90     while (remaining () > 0)
  91       {
  92         put (copied, get ());
  93         copied++;
  94       }
  95
  96     position (copied);
  97     return this;
  98   }
  99
 100   public boolean isDirect ()
 101   {
 102     return false;
 103   }
 104
 105   final public CharSequence subSequence (int start, int end)
 106   {
 107     if (start < 0
 108         || start > length ()
 109         || end < start
 110         || end > length ())
 111       throw new IndexOutOfBoundsException ();
 112
 113     return new CharBufferImpl (backing_buffer, array_offset, capacity (), position () + end, position () + start, -1, isReadOnly ());
 114   }
 115
 116   /**
 117    * Relative get method. Reads the next <code>char</code> from the buffer.
 118    */
 119   final public char get ()
 120   {
 121     char result = backing_buffer [position ()];
 122     position (position () + 1);
 123     return result;
 124   }
 125
 126   /**
 127    * Relative put method. Writes <code>value</code> to the next position
 128    * in the buffer.
 129    *
 130    * @exception ReadOnlyBufferException If this buffer is read-only.
 131    */
 132   final public CharBuffer put (char value)
 133   {
 134     if (readOnly)
 135       throw new ReadOnlyBufferException ();
 136
 137     backing_buffer [position ()] = value;
 138     position (position () + 1);
 139     return this;
 140   }
 141
 142   /**
 143    * Absolute get method. Reads the <code>char</code> at position
 144    * <code>index</code>.
 145    *
 146    * @exception IndexOutOfBoundsException If index is negative or not smaller
 147    * than the buffer's limit.
 148    */
 149   final public char get (int index)
 150   {
 151     if (index < 0
 152         || index >= limit ())
 153       throw new IndexOutOfBoundsException ();
 154
 155     return backing_buffer [index];
 156   }
 157
 158   /**
 159    * Absolute put method. Writes <code>value</value> to position
 160    * <code>index</code> in the buffer.
 161    *
 162    * @exception IndexOutOfBoundsException If index is negative or not smaller
 163    * than the buffer's limit.
 164    * @exception ReadOnlyBufferException If this buffer is read-only.
 165    */
 166   final public CharBuffer put (int index, char value)
 167   {
 168     if (index < 0
 169         || index >= limit ())
 170       throw new IndexOutOfBoundsException ();
 171
 172     if (readOnly)
 173       throw new ReadOnlyBufferException ();
 174
 175     backing_buffer [index] = value;
 176     return this;
 177   }
 178
 179   final public ByteOrder order ()
 180   {
 181     return ByteOrder.nativeOrder ();
 182   }
 183 }