libjava/ChangeLog:
[official-gcc.git] / libjava / classpath / java / nio / ShortViewBufferImpl.java
blob3c7c774780296c0ad0b92f10a6b6a5ad6ae102cc
1 /* ShortViewBufferImpl.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)
9 any later version.
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
19 02110-1301 USA.
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.
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. */
39 package java.nio;
41 final class ShortViewBufferImpl extends ShortBuffer
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 ShortViewBufferImpl (ByteBuffer bb, int capacity)
51 super (capacity, capacity, 0, -1, bb.isDirect() ?
52 VMDirectByteBuffer.adjustAddress(bb.address, bb.position()):null, null, 0);
53 this.bb = bb;
54 this.offset = bb.position();
55 this.readOnly = bb.isReadOnly();
56 this.endian = bb.order();
59 public ShortViewBufferImpl (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, offset):null, null, 0);
65 this.bb = bb;
66 this.offset = offset;
67 this.readOnly = readOnly;
68 this.endian = endian;
71 /**
72 * Reads the <code>short</code> at this buffer's current position,
73 * and then increments the position.
75 * @exception BufferUnderflowException If there are no remaining
76 * <code>short</code>s in this buffer.
78 public short get ()
80 int p = position();
81 short result = ByteBufferHelper.getShort(bb, (p << 1) + offset, endian);
82 position(p + 1);
83 return result;
86 /**
87 * Absolute get method. Reads the <code>short</code> at position
88 * <code>index</code>.
90 * @exception IndexOutOfBoundsException If index is negative or not smaller
91 * than the buffer's limit.
93 public short get (int index)
95 return ByteBufferHelper.getShort(bb, (index << 1) + offset, endian);
98 public ShortBuffer put (short value)
100 int p = position();
101 ByteBufferHelper.putShort(bb, (p << 1) + offset, value, endian);
102 position(p + 1);
103 return this;
106 public ShortBuffer put (int index, short value)
108 ByteBufferHelper.putShort(bb, (index << 1) + offset, value, endian);
109 return this;
112 public ShortBuffer compact ()
114 if (position () > 0)
116 int count = limit () - position ();
117 bb.shiftDown(offset, offset + 2 * position(), 2 * count);
118 position (count);
119 limit (capacity ());
121 else
123 position(limit());
124 limit(capacity());
126 return this;
129 public ShortBuffer slice ()
131 // Create a sliced copy of this object that shares its content.
132 return new ShortViewBufferImpl (bb, (position () << 1) + offset,
133 remaining(), remaining(), 0, -1,
134 readOnly, endian);
137 ShortBuffer duplicate (boolean readOnly)
139 int pos = position();
140 reset();
141 int mark = position();
142 position(pos);
143 return new ShortViewBufferImpl (bb, offset, capacity(), limit(),
144 pos, mark, readOnly, endian);
147 public ShortBuffer duplicate ()
149 return duplicate(readOnly);
152 public ShortBuffer asReadOnlyBuffer ()
154 return duplicate(true);
157 public boolean isReadOnly ()
159 return readOnly;
162 public boolean isDirect ()
164 return bb.isDirect ();
167 public ByteOrder order ()
169 return endian;