|
1
7
8
10 package java.nio;
11
12 import sun.misc.Cleaner;
13 import sun.misc.Unsafe;
14 import sun.nio.ch.DirectBuffer;
15 import sun.nio.ch.FileChannelImpl;
16
17
18 class DirectDoubleBufferS
19
20 extends DoubleBuffer 
21
22
23
24 implements DirectBuffer
25 {
26
27
28
29 protected static final Unsafe unsafe = Bits.unsafe();
31
32 protected static final boolean unaligned = Bits.unaligned();
34
35
39 protected Object viewedBuffer = null;
42
43 public Object viewedBuffer() {
44 return viewedBuffer;
45 }
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82 public Cleaner cleaner() { return null; }
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144 DirectDoubleBufferS(DirectBuffer db, int mark, int pos, int lim, int cap,
148 int off)
149 {
150
151 super(mark, pos, lim, cap);
152 address = db.address() + off;
153 viewedBuffer = db;
154
155
156
157
158
159
160 }
161
162 public DoubleBuffer slice() {
163 int pos = this.position();
164 int lim = this.limit();
165 assert (pos <= lim);
166 int rem = (pos <= lim ? lim - pos : 0);
167 int off = (pos << 3);
168 assert (off >= 0);
169 return new DirectDoubleBufferS (this, -1, 0, rem, rem, off);
170 }
171
172 public DoubleBuffer duplicate() {
173 return new DirectDoubleBufferS (this,
174 this.markValue(),
175 this.position(),
176 this.limit(),
177 this.capacity(),
178 0);
179 }
180
181 public DoubleBuffer asReadOnlyBuffer() {
182
183 return new DirectDoubleBufferRS (this,
184 this.markValue(),
185 this.position(),
186 this.limit(),
187 this.capacity(),
188 0);
189
190
191
192 }
193
194
195
196 public long address() {
197 return address;
198 }
199
200 private long ix(int i) {
201 return address + (i << 3);
202 }
203
204 public double get() {
205 return Double.longBitsToDouble(Bits.swap(unsafe.getLong(ix(nextGetIndex()))));
206 }
207
208 public double get(int i) {
209 return Double.longBitsToDouble(Bits.swap(unsafe.getLong(ix(checkIndex(i)))));
210 }
211
212 public DoubleBuffer get(double[] dst, int offset, int length) {
213
214 if ((length << 3) > Bits.JNI_COPY_TO_ARRAY_THRESHOLD) {
215 checkBounds(offset, length, dst.length);
216 int pos = position();
217 int lim = limit();
218 assert (pos <= lim);
219 int rem = (pos <= lim ? lim - pos : 0);
220 if (length > rem)
221 throw new BufferUnderflowException ();
222
223 if (order() != ByteOrder.nativeOrder())
224 Bits.copyToLongArray(ix(pos), dst,
225 offset << 3,
226 length << 3);
227 else
228 Bits.copyToByteArray(ix(pos), dst,
229 offset << 3,
230 length << 3);
231 position(pos + length);
232 } else {
233 super.get(dst, offset, length);
234 }
235 return this;
236
237
238
239 }
240
241
242
243 public DoubleBuffer put(double x) {
244
245 unsafe.putLong(ix(nextPutIndex()), Bits.swap(Double.doubleToRawLongBits(x)));
246 return this;
247
248
249
250 }
251
252 public DoubleBuffer put(int i, double x) {
253
254 unsafe.putLong(ix(checkIndex(i)), Bits.swap(Double.doubleToRawLongBits(x)));
255 return this;
256
257
258
259 }
260
261 public DoubleBuffer put(DoubleBuffer src) {
262
263 if (src instanceof DirectDoubleBufferS ) {
264 if (src == this)
265 throw new IllegalArgumentException ();
266 DirectDoubleBufferS sb = (DirectDoubleBufferS )src;
267
268 int spos = sb.position();
269 int slim = sb.limit();
270 assert (spos <= slim);
271 int srem = (spos <= slim ? slim - spos : 0);
272
273 int pos = position();
274 int lim = limit();
275 assert (pos <= lim);
276 int rem = (pos <= lim ? lim - pos : 0);
277
278 if (srem > rem)
279 throw new BufferOverflowException ();
280 unsafe.copyMemory(sb.ix(spos), ix(pos), srem << 3);
281 sb.position(spos + srem);
282 position(pos + srem);
283 } else if (!src.isDirect()) {
284
285 int spos = src.position();
286 int slim = src.limit();
287 assert (spos <= slim);
288 int srem = (spos <= slim ? slim - spos : 0);
289
290 put(src.hb, src.offset + spos, srem);
291 src.position(spos + srem);
292
293 } else {
294 super.put(src);
295 }
296 return this;
297
298
299
300 }
301
302 public DoubleBuffer put(double[] src, int offset, int length) {
303
304 if ((length << 3) > Bits.JNI_COPY_FROM_ARRAY_THRESHOLD) {
305 checkBounds(offset, length, src.length);
306 int pos = position();
307 int lim = limit();
308 assert (pos <= lim);
309 int rem = (pos <= lim ? lim - pos : 0);
310 if (length > rem)
311 throw new BufferOverflowException ();
312
313 if (order() != ByteOrder.nativeOrder())
314 Bits.copyFromLongArray(src, offset << 3,
315 ix(pos), length << 3);
316 else
317 Bits.copyFromByteArray(src, offset << 3,
318 ix(pos), length << 3);
319 position(pos + length);
320 } else {
321 super.put(src, offset, length);
322 }
323 return this;
324
325
326
327 }
328
329 public DoubleBuffer compact() {
330
331 int pos = position();
332 int lim = limit();
333 assert (pos <= lim);
334 int rem = (pos <= lim ? lim - pos : 0);
335
336 unsafe.copyMemory(ix(pos), ix(0), rem << 3);
337 position(rem);
338 limit(capacity());
339 return this;
340
341
342
343 }
344
345 public boolean isDirect() {
346 return true;
347 }
348
349 public boolean isReadOnly() {
350 return false;
351 }
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397 public ByteOrder order() {
398
399 return ((ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN)
400 ? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN);
401
402
403
404
405
406 }
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433 }
434 |
Popular Tags |
Java API By Example, From Geeks To Geeks.