libjava/classpath/java/nio/ShortBufferImpl.java

   1 /* ShortBufferImpl.java --
   2    Copyright (C) 2002, 2003, 2004, 2005  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
  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     checkIfReadOnly();
  84     mark = -1;
  85     int p = position();
  86     int n = limit() - p;
  87     if (n > 0)
  88       {
  89         System.arraycopy(backing_buffer, array_offset + p,
  90                          backing_buffer, array_offset, n);
  91       }
  92     position(n);
  93     limit(capacity());
  94     return this;
  95   }
  96
  97   public boolean isDirect ()
  98   {
  99     return false;
 100   }
 101
 102   /**
 103    * Reads the <code>short</code> at this buffer's current position,
 104    * and then increments the position.
 105    *
 106    * @exception BufferUnderflowException If there are no remaining
 107    * <code>short</code>s in this buffer.
 108    */
 109   public short get ()
 110   {
 111     checkForUnderflow();
 112
 113     short result = backing_buffer [position ()];
 114     position (position () + 1);
 115     return result;
 116   }
 117
 118   /**
 119    * Relative put method. Writes <code>value</code> to the next position
 120    * in the buffer.
 121    *
 122    * @exception BufferOverflowException If there no remaining
 123    * space in this buffer.
 124    * @exception ReadOnlyBufferException If this buffer is read-only.
 125    */
 126   public ShortBuffer put (short value)
 127   {
 128     checkIfReadOnly();
 129     checkForOverflow();
 130
 131     backing_buffer [position ()] = value;
 132     position (position () + 1);
 133     return this;
 134   }
 135
 136   /**
 137    * Absolute get method. Reads the <code>short</code> at position
 138    * <code>index</code>.
 139    *
 140    * @exception IndexOutOfBoundsException If index is negative or not smaller
 141    * than the buffer's limit.
 142    */
 143   public short get (int index)
 144   {
 145     checkIndex(index);
 146
 147     return backing_buffer [index];
 148   }
 149
 150   /**
 151    * Absolute put method. Writes <code>value</code> to position
 152    * <code>index</code> in the buffer.
 153    *
 154    * @exception IndexOutOfBoundsException If index is negative or not smaller
 155    * than the buffer's limit.
 156    * @exception ReadOnlyBufferException If this buffer is read-only.
 157    */
 158   public ShortBuffer put (int index, short value)
 159   {
 160     checkIfReadOnly();
 161     checkIndex(index);
 162
 163     backing_buffer [index] = value;
 164     return this;
 165   }
 166
 167   public ByteOrder order ()
 168   {
 169     return ByteOrder.nativeOrder ();
 170   }
 171 }