1 /* ByteBufferImpl.java --
2 Copyright (C) 2002, 2003, 2004, 2005 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. */
42 * This is a Heap memory implementation
44 final class ByteBufferImpl
extends ByteBuffer
46 private boolean readOnly
;
48 ByteBufferImpl (byte[] buffer
, int offset
, int capacity
, int limit
, int position
, int mark
, boolean readOnly
)
50 super (capacity
, limit
, position
, mark
);
51 this.backing_buffer
= buffer
;
52 this.array_offset
= offset
;
53 this.readOnly
= readOnly
;
56 public CharBuffer
asCharBuffer ()
58 return new CharViewBufferImpl (this, remaining() >> 1);
61 public ShortBuffer
asShortBuffer ()
63 return new ShortViewBufferImpl (this, remaining() >> 1);
66 public IntBuffer
asIntBuffer ()
68 return new IntViewBufferImpl (this, remaining() >> 2);
71 public LongBuffer
asLongBuffer ()
73 return new LongViewBufferImpl (this, remaining() >> 3);
76 public FloatBuffer
asFloatBuffer ()
78 return new FloatViewBufferImpl (this, remaining() >> 2);
81 public DoubleBuffer
asDoubleBuffer ()
83 return new DoubleViewBufferImpl (this, remaining() >> 3);
86 public boolean isReadOnly ()
91 public ByteBuffer
slice ()
93 return new ByteBufferImpl (backing_buffer
, array_offset
+ position (), remaining (), remaining (), 0, -1, isReadOnly ());
96 public ByteBuffer
duplicate ()
98 return new ByteBufferImpl (backing_buffer
, array_offset
, capacity (), limit (), position (), mark
, isReadOnly ());
101 public ByteBuffer
asReadOnlyBuffer ()
103 return new ByteBufferImpl (backing_buffer
, array_offset
, capacity (), limit (), position (), mark
, true);
106 void shiftDown (int dst_offset
, int src_offset
, int count
)
108 System
.arraycopy(backing_buffer
, array_offset
+ src_offset
,
109 backing_buffer
, array_offset
+ dst_offset
,
113 public ByteBuffer
compact ()
117 int pos
= position();
118 int n
= limit() - pos
;
120 shiftDown(0, pos
, n
);
126 public boolean isDirect ()
132 * Reads the <code>byte</code> at this buffer's current position,
133 * and then increments the position.
135 * @exception BufferUnderflowException If there are no remaining
136 * <code>bytes</code> in this buffer.
141 throw new BufferUnderflowException();
143 return backing_buffer
[(pos
++) + array_offset
];
149 public ByteBuffer
get (byte[] dst
, int offset
, int length
)
151 checkArraySize(dst
.length
, offset
, length
);
152 if ( (limit
- pos
) < length
) // check for overflow
153 throw new BufferUnderflowException();
155 System
.arraycopy(backing_buffer
, pos
+ array_offset
,
156 dst
, offset
, length
);
163 * Relative bulk put(), overloads the ByteBuffer impl.
165 public ByteBuffer
put (byte[] src
, int offset
, int length
)
167 if ( (limit
- pos
) < length
) // check for overflow
168 throw new BufferOverflowException();
169 checkArraySize(src
.length
, offset
, length
);
171 System
.arraycopy(src
, offset
, backing_buffer
, pos
+ array_offset
, length
);
178 * Relative put method. Writes <code>value</code> to the next position
181 * @exception BufferOverflowException If there is no remaining
182 * space in this buffer.
183 * @exception ReadOnlyBufferException If this buffer is read-only.
185 public ByteBuffer
put (byte value
)
188 throw new ReadOnlyBufferException();
190 throw new BufferOverflowException();
192 backing_buffer
[(pos
++) + array_offset
] = value
;
197 * Absolute get method. Reads the <code>byte</code> at position
198 * <code>index</code>.
200 * @exception IndexOutOfBoundsException If index is negative or not smaller
201 * than the buffer's limit.
203 public byte get (int index
)
207 return backing_buffer
[index
+ array_offset
];
211 * Absolute put method. Writes <code>value</code> to position
212 * <code>index</code> in the buffer.
214 * @exception IndexOutOfBoundsException If index is negative or not smaller
215 * than the buffer's limit.
216 * @exception ReadOnlyBufferException If this buffer is read-only.
218 public ByteBuffer
put (int index
, byte value
)
223 backing_buffer
[index
+ array_offset
] = value
;
227 public char getChar ()
229 return ByteBufferHelper
.getChar(this, order());
232 public ByteBuffer
putChar (char value
)
235 throw new ReadOnlyBufferException ();
236 if ( (limit
-pos
) < 2)
237 throw new BufferOverflowException();
239 if (endian
== ByteOrder
.LITTLE_ENDIAN
)
241 backing_buffer
[(pos
++) + array_offset
] = (byte)(value
&0xFF);
242 backing_buffer
[(pos
++) + array_offset
] = (byte)(value
>>8);
246 backing_buffer
[(pos
++) + array_offset
] = (byte)(value
>>8);
247 backing_buffer
[(pos
++) + array_offset
] = (byte)(value
&0xFF);
252 public char getChar (int index
)
254 return ByteBufferHelper
.getChar(this, index
, order());
257 public ByteBuffer
putChar (int index
, char value
)
259 ByteBufferHelper
.putChar(this, index
, value
, order());
263 public short getShort ()
265 return ByteBufferHelper
.getShort(this, order());
268 public ByteBuffer
putShort (short value
)
270 ByteBufferHelper
.putShort(this, value
, order());
274 public short getShort (int index
)
276 return ByteBufferHelper
.getShort(this, index
, order());
279 public ByteBuffer
putShort (int index
, short value
)
281 ByteBufferHelper
.putShort(this, index
, value
, order());
287 return ByteBufferHelper
.getInt(this, order());
290 public ByteBuffer
putInt (int value
)
292 ByteBufferHelper
.putInt(this, value
, order());
296 public int getInt (int index
)
298 return ByteBufferHelper
.getInt(this, index
, order());
301 public ByteBuffer
putInt (int index
, int value
)
303 ByteBufferHelper
.putInt(this, index
, value
, order());
307 public long getLong ()
309 return ByteBufferHelper
.getLong(this, order());
312 public ByteBuffer
putLong (long value
)
314 ByteBufferHelper
.putLong (this, value
, order());
318 public long getLong (int index
)
320 return ByteBufferHelper
.getLong (this, index
, order());
323 public ByteBuffer
putLong (int index
, long value
)
325 ByteBufferHelper
.putLong (this, index
, value
, order());
329 public float getFloat ()
331 return ByteBufferHelper
.getFloat (this, order());
334 public ByteBuffer
putFloat (float value
)
336 ByteBufferHelper
.putFloat (this, value
, order());
340 public float getFloat (int index
)
342 return ByteBufferHelper
.getFloat (this, index
, order());
345 public ByteBuffer
putFloat (int index
, float value
)
347 ByteBufferHelper
.putFloat (this, index
, value
, order());
351 public double getDouble ()
353 return ByteBufferHelper
.getDouble (this, order());
356 public ByteBuffer
putDouble (double value
)
358 ByteBufferHelper
.putDouble (this, value
, order());
362 public double getDouble (int index
)
364 return ByteBufferHelper
.getDouble (this, index
, order());
367 public ByteBuffer
putDouble (int index
, double value
)
369 ByteBufferHelper
.putDouble (this, index
, value
, order());