libjava/java/nio/ShortViewBufferImpl.java

   1 /* ShortViewBufferImpl.java --
   2    Copyright (C) 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 class ShortViewBufferImpl extends ShortBuffer
  42 {
  43   /** Position in bb (i.e. a byte offset) where this buffer starts. */
  44   private int offset;
  45   private ByteBuffer bb;
  46   private boolean readOnly;
  47   private ByteOrder endian;
  48
  49   public ShortViewBufferImpl (ByteBuffer bb, int offset, int capacity,
  50                               int limit, int position, int mark,
  51                               boolean readOnly, ByteOrder endian)
  52   {
  53     super (limit >> 1, limit >> 1, position >> 1, mark >> 1);
  54     this.bb = bb;
  55     this.offset = offset;
  56     this.readOnly = readOnly;
  57     this.endian = endian;
  58   }
  59
  60   public short get ()
  61   {
  62     int p = position();
  63     short result = ByteBufferHelper.getShort(bb, (p << 1) + offset, endian);
  64     position(p + 1);
  65     return result;
  66   }
  67
  68   public short get (int index)
  69   {
  70     return ByteBufferHelper.getShort(bb, (index << 1) + offset, endian);
  71   }
  72
  73   public ShortBuffer put (short value)
  74   {
  75     int p = position();
  76     ByteBufferHelper.putShort(bb, (p << 1) + offset, value, endian);
  77     position(p + 1);
  78     return this;
  79   }
  80
  81   public ShortBuffer put (int index, short value)
  82   {
  83     ByteBufferHelper.putShort(bb, (index << 1) + offset, value, endian);
  84     return this;
  85   }
  86
  87   public ShortBuffer compact ()
  88   {
  89     if (position () > 0)
  90       {
  91         int count = limit () - position ();
  92         bb.shiftDown(offset, offset + 2 * position(), 2 * count);
  93         position (count);
  94         limit (capacity ());
  95       }
  96     return this;
  97   }
  98
  99   public ShortBuffer slice ()
 100   {
 101     // Create a sliced copy of this object that shares its content.
 102     return new ShortViewBufferImpl (bb, (position () >> 1) + offset,
 103                                     remaining(), remaining(), 0, -1,
 104                                     readOnly, endian);
 105   }
 106
 107   ShortBuffer duplicate (boolean readOnly)
 108   {
 109     int pos = position();
 110     reset();
 111     int mark = position();
 112     position(pos);
 113     return new ShortViewBufferImpl (bb, offset, capacity(), limit(),
 114                                     pos, mark, readOnly, endian);
 115   }
 116
 117   public ShortBuffer duplicate ()
 118   {
 119     return duplicate(readOnly);
 120   }
 121
 122   public ShortBuffer asReadOnlyBuffer ()
 123   {
 124     return duplicate(true);
 125   }
 126
 127   public boolean isReadOnly ()
 128   {
 129     return readOnly;
 130   }
 131
 132   public boolean isDirect ()
 133   {
 134     return bb.isDirect ();
 135   }
 136
 137   public ByteOrder order ()
 138   {
 139     return endian;
 140   }
 141 }