1 /* DoubleViewBufferImpl.java --
2 Copyright (C) 2003 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., 59 Temple Place, Suite 330, 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 DoubleViewBufferImpl
extends DoubleBuffer
43 private boolean readOnly
;
45 private ByteBuffer bb
;
46 private ByteOrder endian
;
48 public DoubleViewBufferImpl (ByteBuffer bb
, boolean readOnly
)
50 super (bb
.remaining () >> 3, bb
.remaining () >> 3, bb
.position (), 0);
52 this.readOnly
= readOnly
;
53 // FIXME: What if this is called from DoubleByteBufferImpl and ByteBuffer has changed its endianess ?
54 this.endian
= bb
.order ();
57 public DoubleViewBufferImpl (ByteBuffer bb
, int offset
, int capacity
,
58 int limit
, int position
, int mark
,
61 super (limit
>> 3, limit
>> 3, position
>> 3, mark
>> 3);
64 this.readOnly
= readOnly
;
65 // FIXME: What if this is called from DoubleViewBufferImpl and ByteBuffer has changed its endianess ?
66 this.endian
= bb
.order ();
71 double result
= bb
.getDouble ((position () << 3) + offset
);
72 position (position () + 1);
76 public double get (int index
)
78 return bb
.getDouble ((index
<< 3) + offset
);
81 public DoubleBuffer
put (double value
)
83 bb
.putDouble ((position () << 3) + offset
, value
);
84 position (position () + 1);
88 public DoubleBuffer
put (int index
, double value
)
90 bb
.putDouble ((index
<< 3) + offset
, value
);
94 public DoubleBuffer
compact ()
98 // Copy all data from position() to limit() to the beginning of the
99 // buffer, set position to end of data and limit to capacity
100 // XXX: This can surely be optimized, for direct and non-direct buffers
102 int count
= limit () - position ();
104 for (int i
= 0; i
< count
; i
++)
106 bb
.putDouble ((i
>> 3) + offset
,
107 bb
.getDouble (((i
+ position ()) >> 3) + offset
));
117 public DoubleBuffer
duplicate ()
119 // Create a copy of this object that shares its content
120 // FIXME: mark is not correct
121 return new DoubleViewBufferImpl (bb
, offset
, capacity (), limit (),
122 position (), -1, isReadOnly ());
125 public DoubleBuffer
slice ()
127 // Create a sliced copy of this object that shares its content.
128 return new DoubleViewBufferImpl (bb
, (position () >> 3) + offset
,
129 remaining (), remaining (), 0, -1,
133 public DoubleBuffer
asReadOnlyBuffer ()
135 // Create a copy of this object that shares its content and is read-only
136 return new DoubleViewBufferImpl (bb
, (position () >> 3) + offset
,
137 remaining (), remaining (), 0, -1, true);
140 public boolean isReadOnly ()
145 public boolean isDirect ()
147 return bb
.isDirect ();
150 public ByteOrder
order ()
152 return ByteOrder
.LITTLE_ENDIAN
;