libjava/java/nio/DoubleViewBufferImpl.java

   1 /* DoubleViewBufferImpl.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 DoubleViewBufferImpl extends DoubleBuffer
  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 DoubleViewBufferImpl (ByteBuffer bb, int offset, int capacity,
  50                                int limit, int position, int mark,
  51                                boolean readOnly, ByteOrder endian)
  52   {
  53     super (limit >> 3, limit >> 3, position >> 3, mark >> 3);
  54     this.bb = bb;
  55     this.offset = offset;
  56     this.readOnly = readOnly;
  57     this.endian = endian;
  58   }
  59
  60   public double get ()
  61   {
  62     int p = position();
  63     double result = ByteBufferHelper.getDouble(bb, (p << 3) + offset, endian);
  64     position(p + 1);
  65     return result;
  66   }
  67
  68   public double get (int index)
  69   {
  70     return ByteBufferHelper.getDouble(bb, (index << 3) + offset, endian);
  71   }
  72
  73   public DoubleBuffer put (double value)
  74   {
  75     int p = position();
  76     ByteBufferHelper.putDouble(bb, (p << 3) + offset, value, endian);
  77     position(p + 1);
  78     return this;
  79   }
  80
  81   public DoubleBuffer put (int index, double value)
  82   {
  83     ByteBufferHelper.putDouble(bb, (index << 3) + offset, value, endian);
  84     return this;
  85   }
  86
  87   public DoubleBuffer compact ()
  88   {
  89     if (position () > 0)
  90       {
  91         int count = limit () - position ();
  92         bb.shiftDown(offset, offset + 8 * position(), 8 * count);
  93         position (count);
  94         limit (capacity ());
  95       }
  96     return this;
  97   }
  98
  99   public DoubleBuffer slice ()
 100   {
 101     return new DoubleViewBufferImpl (bb, (position () >> 3) + offset,
 102                                      remaining(), remaining(), 0, -1,
 103                                      readOnly, endian);
 104   }
 105
 106   DoubleBuffer duplicate (boolean readOnly)
 107   {
 108     int pos = position();
 109     reset();
 110     int mark = position();
 111     position(pos);
 112     return new DoubleViewBufferImpl (bb, offset, capacity(), limit(),
 113                                      pos, mark, readOnly, endian);
 114   }
 115
 116   public DoubleBuffer duplicate ()
 117   {
 118     return duplicate(readOnly);
 119   }
 120
 121   public DoubleBuffer asReadOnlyBuffer ()
 122   {
 123     return duplicate(true);
 124   }
 125
 126   public boolean isReadOnly ()
 127   {
 128     return readOnly;
 129   }
 130
 131   public boolean isDirect ()
 132   {
 133     return bb.isDirect ();
 134   }
 135
 136   public ByteOrder order ()
 137   {
 138     return endian;
 139   }
 140 }