1 /* DirectByteBufferImpl.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 import gnu.classpath.Pointer;
43 abstract class DirectByteBufferImpl extends ByteBuffer
46 * The owner is used to keep alive the object that actually owns the
47 * memory. There are three possibilities:
48 * 1) owner == this: We allocated the memory and we should free it,
49 * but *only* in finalize (if we've been sliced
50 * other objects will also have access to the
52 * 2) owner == null: The byte buffer was created thru
53 * JNI.NewDirectByteBuffer. The JNI code is
54 * responsible for freeing the memory.
55 * 3) owner == some other object: The other object allocated the
56 * memory and should free it.
58 private final Object owner;
60 static final class ReadOnly extends DirectByteBufferImpl
62 ReadOnly(Object owner, Pointer address,
63 int capacity, int limit,
66 super(owner, address, capacity, limit, position);
69 public ByteBuffer put(byte value)
71 throw new ReadOnlyBufferException ();
74 public ByteBuffer put(int index, byte value)
76 throw new ReadOnlyBufferException ();
79 public boolean isReadOnly()
85 static final class ReadWrite extends DirectByteBufferImpl
87 ReadWrite(int capacity)
92 ReadWrite(Object owner, Pointer address,
93 int capacity, int limit,
96 super(owner, address, capacity, limit, position);
99 public boolean isReadOnly()
105 DirectByteBufferImpl(int capacity)
107 super(capacity, capacity, 0, -1);
109 this.address = VMDirectByteBuffer.allocate(capacity);
112 DirectByteBufferImpl(Object owner, Pointer address,
113 int capacity, int limit,
116 super(capacity, limit, position, -1);
118 this.address = address;
122 * Allocates a new direct byte buffer.
124 public static ByteBuffer allocate(int capacity)
126 return new DirectByteBufferImpl.ReadWrite(capacity);
129 protected void finalize() throws Throwable
132 VMDirectByteBuffer.free(address);
139 int pos = position();
140 byte result = VMDirectByteBuffer.get(address, pos);
145 public byte get(int index)
149 return VMDirectByteBuffer.get(address, index);
152 public ByteBuffer get(byte[] dst, int offset, int length)
154 checkArraySize(dst.length, offset, length);
155 checkForUnderflow(length);
157 int index = position();
158 VMDirectByteBuffer.get(address, index, dst, offset, length);
159 position(index+length);
164 public ByteBuffer put(byte value)
168 int pos = position();
169 VMDirectByteBuffer.put(address, pos, value);
174 public ByteBuffer put(int index, byte value)
178 VMDirectByteBuffer.put(address, index, value);
182 public ByteBuffer put (byte[] src, int offset, int length)
184 checkArraySize (src.length, offset, length);
185 checkForUnderflow (length);
187 int index = position ();
188 VMDirectByteBuffer.put (address, index, src, offset, length);
189 position (index + length);
194 void shiftDown(int dst_offset, int src_offset, int count)
196 VMDirectByteBuffer.shiftDown(address, dst_offset, src_offset, count);
199 public ByteBuffer compact()
203 int pos = position();
206 int count = remaining();
207 VMDirectByteBuffer.shiftDown(address, 0, pos, count);
219 public ByteBuffer slice()
221 int rem = remaining();
223 return new DirectByteBufferImpl.ReadOnly
224 (owner, VMDirectByteBuffer.adjustAddress(address, position()),
227 return new DirectByteBufferImpl.ReadWrite
228 (owner, VMDirectByteBuffer.adjustAddress(address, position()),
232 private ByteBuffer duplicate(boolean readOnly)
234 int pos = position();
236 int mark = position();
238 DirectByteBufferImpl result;
240 result = new DirectByteBufferImpl.ReadOnly(owner, address, capacity(),
243 result = new DirectByteBufferImpl.ReadWrite(owner, address, capacity(),
248 result.position(mark);
250 result.position(pos);
255 public ByteBuffer duplicate()
257 return duplicate(isReadOnly());
260 public ByteBuffer asReadOnlyBuffer()
262 return duplicate(true);
265 public boolean isDirect()
270 public CharBuffer asCharBuffer()
272 return new CharViewBufferImpl(this, remaining() >> 1);
275 public ShortBuffer asShortBuffer()
277 return new ShortViewBufferImpl(this, remaining() >> 1);
280 public IntBuffer asIntBuffer()
282 return new IntViewBufferImpl(this, remaining() >> 2);
285 public LongBuffer asLongBuffer()
287 return new LongViewBufferImpl(this, remaining() >> 3);
290 public FloatBuffer asFloatBuffer()
292 return new FloatViewBufferImpl(this, remaining() >> 2);
295 public DoubleBuffer asDoubleBuffer()
297 return new DoubleViewBufferImpl(this, remaining() >> 3);
300 public char getChar()
302 return ByteBufferHelper.getChar(this, order());
305 public ByteBuffer putChar(char value)
307 ByteBufferHelper.putChar(this, value, order());
311 public char getChar(int index)
313 return ByteBufferHelper.getChar(this, index, order());
316 public ByteBuffer putChar(int index, char value)
318 ByteBufferHelper.putChar(this, index, value, order());
322 public short getShort()
324 return ByteBufferHelper.getShort(this, order());
327 public ByteBuffer putShort(short value)
329 ByteBufferHelper.putShort(this, value, order());
333 public short getShort(int index)
335 return ByteBufferHelper.getShort(this, index, order());
338 public ByteBuffer putShort(int index, short value)
340 ByteBufferHelper.putShort(this, index, value, order());
346 return ByteBufferHelper.getInt(this, order());
349 public ByteBuffer putInt(int value)
351 ByteBufferHelper.putInt(this, value, order());
355 public int getInt(int index)
357 return ByteBufferHelper.getInt(this, index, order());
360 public ByteBuffer putInt(int index, int value)
362 ByteBufferHelper.putInt(this, index, value, order());
366 public long getLong()
368 return ByteBufferHelper.getLong(this, order());
371 public ByteBuffer putLong(long value)
373 ByteBufferHelper.putLong(this, value, order());
377 public long getLong(int index)
379 return ByteBufferHelper.getLong(this, index, order());
382 public ByteBuffer putLong(int index, long value)
384 ByteBufferHelper.putLong(this, index, value, order());
388 public float getFloat()
390 return ByteBufferHelper.getFloat(this, order());
393 public ByteBuffer putFloat(float value)
395 ByteBufferHelper.putFloat(this, value, order());
399 public float getFloat(int index)
401 return ByteBufferHelper.getFloat(this, index, order());
404 public ByteBuffer putFloat(int index, float value)
406 ByteBufferHelper.putFloat(this, index, value, order());
410 public double getDouble()
412 return ByteBufferHelper.getDouble(this, order());
415 public ByteBuffer putDouble(double value)
417 ByteBufferHelper.putDouble(this, value, order());
421 public double getDouble(int index)
423 return ByteBufferHelper.getDouble(this, index, order());
426 public ByteBuffer putDouble(int index, double value)
428 ByteBufferHelper.putDouble(this, index, value, order());