libjava/java/nio/ShortBufferImpl.java

   1 /* ShortBufferImpl.java --
   2    Copyright (C) 2002, 2003, 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 java.nio;
  40
  41 /**
  42  * This is a Heap memory implementation
  43  */
  44 final class ShortBufferImpl extends ShortBuffer
  45 {
  46   private boolean readOnly;
  47
  48   ShortBufferImpl (int capacity)
  49   {
  50     this (new short [capacity], 0, capacity, capacity, 0, -1, false);
  51   }
  52
  53   ShortBufferImpl (short[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly)
  54   {
  55     super (capacity, limit, position, mark);
  56     this.backing_buffer = buffer;
  57     this.array_offset = offset;
  58     this.readOnly = readOnly;
  59   }
  60
  61   public boolean isReadOnly ()
  62   {
  63     return readOnly;
  64   }
  65
  66   public ShortBuffer slice ()
  67   {
  68     return new ShortBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ());
  69   }
  70
  71   public ShortBuffer duplicate ()
  72   {
  73     return new ShortBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ());
  74   }
  75
  76   public ShortBuffer asReadOnlyBuffer ()
  77   {
  78     return new ShortBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);
  79   }
  80
  81   public ShortBuffer compact ()
  82   {
  83     int copied = 0;
  84
  85     while (remaining () > 0)
  86       {
  87         put (copied, get ());
  88         copied++;
  89       }
  90
  91     position (copied);
  92     return this;
  93   }
  94
  95   public boolean isDirect ()
  96   {
  97     return false;
  98   }
  99
 100   /**
 101    * Reads the <code>short</code> at this buffer's current position,
 102    * and then increments the position.
 103    *
 104    * @exception BufferUnderflowException If there are no remaining
 105    * <code>short</code>s in this buffer.
 106    */
 107   public short get ()
 108   {
 109     checkForUnderflow();
 110
 111     short result = backing_buffer [position ()];
 112     position (position () + 1);
 113     return result;
 114   }
 115
 116   /**
 117    * Relative put method. Writes <code>value</code> to the next position
 118    * in the buffer.
 119    *
 120    * @exception BufferOverflowException If there no remaining
 121    * space in this buffer.
 122    * @exception ReadOnlyBufferException If this buffer is read-only.
 123    */
 124   public ShortBuffer put (short value)
 125   {
 126     checkIfReadOnly();
 127     checkForOverflow();
 128
 129     backing_buffer [position ()] = value;
 130     position (position () + 1);
 131     return this;
 132   }
 133
 134   /**
 135    * Absolute get method. Reads the <code>short</code> at position
 136    * <code>index</code>.
 137    *
 138    * @exception IndexOutOfBoundsException If index is negative or not smaller
 139    * than the buffer's limit.
 140    */
 141   public short get (int index)
 142   {
 143     checkIndex(index);
 144
 145     return backing_buffer [index];
 146   }
 147
 148   /**
 149    * Absolute put method. Writes <code>value</value> to position
 150    * <code>index</code> in the buffer.
 151    *
 152    * @exception IndexOutOfBoundsException If index is negative or not smaller
 153    * than the buffer's limit.
 154    * @exception ReadOnlyBufferException If this buffer is read-only.
 155    */
 156   public ShortBuffer put (int index, short value)
 157   {
 158     checkIfReadOnly();
 159     checkIndex(index);
 160
 161     backing_buffer [index] = value;
 162     return this;
 163   }
 164
 165   public ByteOrder order ()
 166   {
 167     return ByteOrder.nativeOrder ();
 168   }
 169 }