1 /* DoubleViewBufferImpl.java --
2 Copyright (C) 2003, 2004 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
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)
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.
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
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
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. */
41 final class DoubleViewBufferImpl extends DoubleBuffer
43 /** Position in bb (i.e. a byte offset) where this buffer starts. */
44 private final int offset;
45 private final ByteBuffer bb;
46 private final boolean readOnly;
47 private final ByteOrder endian;
49 DoubleViewBufferImpl (ByteBuffer bb, int capacity)
51 super (capacity, capacity, 0, -1, bb.isDirect() ?
52 VMDirectByteBuffer.adjustAddress(bb.address, bb.position()) : null, null, 0);
54 this.offset = bb.position();
55 this.readOnly = bb.isReadOnly();
56 this.endian = bb.order();
59 public DoubleViewBufferImpl (ByteBuffer bb, int offset, int capacity,
60 int limit, int position, int mark,
61 boolean readOnly, ByteOrder endian)
63 super (capacity, limit, position, mark, bb.isDirect() ?
64 VMDirectByteBuffer.adjustAddress(bb.address, bb.position()) : null, null, 0);
67 this.readOnly = readOnly;
72 * Reads the <code>double</code> at this buffer's current position,
73 * and then increments the position.
75 * @exception BufferUnderflowException If there are no remaining
76 * <code>double</code>s in this buffer.
81 double result = ByteBufferHelper.getDouble(bb, (p << 3) + offset, endian);
87 * Absolute get method. Reads the <code>double</code> at position
90 * @exception IndexOutOfBoundsException If index is negative or not smaller
91 * than the buffer's limit.
93 public double get (int index)
95 return ByteBufferHelper.getDouble(bb, (index << 3) + offset, endian);
98 public DoubleBuffer put (double value)
101 ByteBufferHelper.putDouble(bb, (p << 3) + offset, value, endian);
106 public DoubleBuffer put (int index, double value)
108 ByteBufferHelper.putDouble(bb, (index << 3) + offset, value, endian);
112 public DoubleBuffer compact ()
116 int count = limit () - position ();
117 bb.shiftDown(offset, offset + 8 * position(), 8 * count);
129 public DoubleBuffer slice ()
131 return new DoubleViewBufferImpl (bb, (position () << 3) + offset,
132 remaining(), remaining(), 0, -1,
136 DoubleBuffer duplicate (boolean readOnly)
138 int pos = position();
140 int mark = position();
142 return new DoubleViewBufferImpl (bb, offset, capacity(), limit(),
143 pos, mark, readOnly, endian);
146 public DoubleBuffer duplicate ()
148 return duplicate(readOnly);
151 public DoubleBuffer asReadOnlyBuffer ()
153 return duplicate(true);
156 public boolean isReadOnly ()
161 public boolean isDirect ()
163 return bb.isDirect ();
166 public ByteOrder order ()