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();
237 int mark = position();
239 DirectByteBufferImpl result;
241 result = new DirectByteBufferImpl.ReadOnly(owner, address, capacity(),
244 result = new DirectByteBufferImpl.ReadWrite(owner, address, capacity(),
249 result.position(mark);
251 result.position(pos);
256 public ByteBuffer duplicate()
258 return duplicate(isReadOnly());
261 public ByteBuffer asReadOnlyBuffer()
263 return duplicate(true);
266 public boolean isDirect()
271 public CharBuffer asCharBuffer()
273 return new CharViewBufferImpl(this, remaining() >> 1);
276 public ShortBuffer asShortBuffer()
278 return new ShortViewBufferImpl(this, remaining() >> 1);
281 public IntBuffer asIntBuffer()
283 return new IntViewBufferImpl(this, remaining() >> 2);
286 public LongBuffer asLongBuffer()
288 return new LongViewBufferImpl(this, remaining() >> 3);
291 public FloatBuffer asFloatBuffer()
293 return new FloatViewBufferImpl(this, remaining() >> 2);
296 public DoubleBuffer asDoubleBuffer()
298 return new DoubleViewBufferImpl(this, remaining() >> 3);
301 public char getChar()
303 return ByteBufferHelper.getChar(this, order());
306 public ByteBuffer putChar(char value)
308 ByteBufferHelper.putChar(this, value, order());
312 public char getChar(int index)
314 return ByteBufferHelper.getChar(this, index, order());
317 public ByteBuffer putChar(int index, char value)
319 ByteBufferHelper.putChar(this, index, value, order());
323 public short getShort()
325 return ByteBufferHelper.getShort(this, order());
328 public ByteBuffer putShort(short value)
330 ByteBufferHelper.putShort(this, value, order());
334 public short getShort(int index)
336 return ByteBufferHelper.getShort(this, index, order());
339 public ByteBuffer putShort(int index, short value)
341 ByteBufferHelper.putShort(this, index, value, order());
347 return ByteBufferHelper.getInt(this, order());
350 public ByteBuffer putInt(int value)
352 ByteBufferHelper.putInt(this, value, order());
356 public int getInt(int index)
358 return ByteBufferHelper.getInt(this, index, order());
361 public ByteBuffer putInt(int index, int value)
363 ByteBufferHelper.putInt(this, index, value, order());
367 public long getLong()
369 return ByteBufferHelper.getLong(this, order());
372 public ByteBuffer putLong(long value)
374 ByteBufferHelper.putLong(this, value, order());
378 public long getLong(int index)
380 return ByteBufferHelper.getLong(this, index, order());
383 public ByteBuffer putLong(int index, long value)
385 ByteBufferHelper.putLong(this, index, value, order());
389 public float getFloat()
391 return ByteBufferHelper.getFloat(this, order());
394 public ByteBuffer putFloat(float value)
396 ByteBufferHelper.putFloat(this, value, order());
400 public float getFloat(int index)
402 return ByteBufferHelper.getFloat(this, index, order());
405 public ByteBuffer putFloat(int index, float value)
407 ByteBufferHelper.putFloat(this, index, value, order());
411 public double getDouble()
413 return ByteBufferHelper.getDouble(this, order());
416 public ByteBuffer putDouble(double value)
418 ByteBufferHelper.putDouble(this, value, order());
422 public double getDouble(int index)
424 return ByteBufferHelper.getDouble(this, index, order());
427 public ByteBuffer putDouble(int index, double value)
429 ByteBufferHelper.putDouble(this, index, value, order());