1 /* CharViewBufferImpl.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 class CharViewBufferImpl
extends CharBuffer
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 CharViewBufferImpl (ByteBuffer bb
, int capacity
)
51 super (capacity
, capacity
, 0, -1, bb
.isDirect() ?
52 VMDirectByteBuffer
.adjustAddress(bb
.address
, bb
.position()) : null,
55 this.offset
= bb
.position();
56 this.readOnly
= bb
.isReadOnly();
57 this.endian
= bb
.order();
60 public CharViewBufferImpl (ByteBuffer bb
, int offset
, int capacity
,
61 int limit
, int position
, int mark
,
62 boolean readOnly
, ByteOrder endian
)
64 super (capacity
, limit
, position
, mark
, bb
.isDirect() ?
65 VMDirectByteBuffer
.adjustAddress(bb
.address
, offset
) : null,
69 this.readOnly
= readOnly
;
74 * Reads the <code>char</code> at this buffer's current position,
75 * and then increments the position.
77 * @exception BufferUnderflowException If there are no remaining
78 * <code>char</code>s in this buffer.
83 char result
= ByteBufferHelper
.getChar(bb
, (p
<< 1) + offset
, endian
);
89 * Absolute get method. Reads the <code>char</code> at position
92 * @param index Position to read the <code>char</code> from.
94 * @exception IndexOutOfBoundsException If index is negative or not smaller
95 * than the buffer's limit.
97 public char get (int index
)
99 return ByteBufferHelper
.getChar(bb
, (index
<< 1) + offset
, endian
);
102 public CharBuffer
put (char value
)
105 ByteBufferHelper
.putChar(bb
, (p
<< 1) + offset
, value
, endian
);
110 public CharBuffer
put (int index
, char value
)
112 ByteBufferHelper
.putChar(bb
, (index
<< 1) + offset
, value
, endian
);
116 public CharBuffer
compact ()
120 int count
= limit () - position ();
121 bb
.shiftDown(offset
, offset
+ 2 * position(), 2 * count
);
133 public CharBuffer
slice ()
135 // Create a sliced copy of this object that shares its content.
136 return new CharViewBufferImpl (bb
, (position () << 1) + offset
,
137 remaining (), remaining (), 0, -1,
138 isReadOnly (), endian
);
141 CharBuffer
duplicate (boolean readOnly
)
143 int pos
= position();
145 int mark
= position();
147 return new CharViewBufferImpl (bb
, offset
, capacity(), limit(),
148 pos
, mark
, readOnly
, endian
);
151 public CharBuffer
duplicate ()
153 return duplicate(readOnly
);
156 public CharBuffer
asReadOnlyBuffer ()
158 return duplicate(true);
161 public CharSequence
subSequence (int start
, int end
)
166 throw new IndexOutOfBoundsException ();
168 return new CharViewBufferImpl (bb
, array_offset
, capacity (),
169 position () + end
, position () + start
,
170 -1, isReadOnly (), endian
);
173 public boolean isReadOnly ()
178 public boolean isDirect ()
180 return bb
.isDirect ();
183 public ByteOrder
order ()