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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 DirectFloatBufferU
19
20 extends FloatBuffer 
21
22
23
24 implements DirectBuffer
25 {
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29 protected static final Unsafe unsafe = Bits.unsafe();
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32 protected static final boolean unaligned = Bits.unaligned();
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39 protected Object viewedBuffer = null;
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43 public Object viewedBuffer() {
44 return viewedBuffer;
45 }
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82 public Cleaner cleaner() { return null; }
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144 DirectFloatBufferU(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
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158
159
160 }
161
162 public FloatBuffer 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 << 2);
168 assert (off >= 0);
169 return new DirectFloatBufferU (this, -1, 0, rem, rem, off);
170 }
171
172 public FloatBuffer duplicate() {
173 return new DirectFloatBufferU (this,
174 this.markValue(),
175 this.position(),
176 this.limit(),
177 this.capacity(),
178 0);
179 }
180
181 public FloatBuffer asReadOnlyBuffer() {
182
183 return new DirectFloatBufferRU (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 << 2);
202 }
203
204 public float get() {
205 return ((unsafe.getFloat(ix(nextGetIndex()))));
206 }
207
208 public float get(int i) {
209 return ((unsafe.getFloat(ix(checkIndex(i)))));
210 }
211
212 public FloatBuffer get(float[] dst, int offset, int length) {
213
214 if ((length << 2) > 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.copyToIntArray(ix(pos), dst,
225 offset << 2,
226 length << 2);
227 else
228 Bits.copyToByteArray(ix(pos), dst,
229 offset << 2,
230 length << 2);
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 FloatBuffer put(float x) {
244
245 unsafe.putFloat(ix(nextPutIndex()), ((x)));
246 return this;
247
248
249
250 }
251
252 public FloatBuffer put(int i, float x) {
253
254 unsafe.putFloat(ix(checkIndex(i)), ((x)));
255 return this;
256
257
258
259 }
260
261 public FloatBuffer put(FloatBuffer src) {
262
263 if (src instanceof DirectFloatBufferU ) {
264 if (src == this)
265 throw new IllegalArgumentException ();
266 DirectFloatBufferU sb = (DirectFloatBufferU )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 << 2);
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 FloatBuffer put(float[] src, int offset, int length) {
303
304 if ((length << 2) > 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.copyFromIntArray(src, offset << 2,
315 ix(pos), length << 2);
316 else
317 Bits.copyFromByteArray(src, offset << 2,
318 ix(pos), length << 2);
319 position(pos + length);
320 } else {
321 super.put(src, offset, length);
322 }
323 return this;
324
325
326
327 }
328
329 public FloatBuffer 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 << 2);
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 }
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397 public ByteOrder order() {
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403 return ((ByteOrder.nativeOrder() != ByteOrder.BIG_ENDIAN)
404 ? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN);
405
406 }
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433 }
434 |
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