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annotate src/org/eclipse/jetty/io/AbstractBuffer.java @ 1046:a8c92b0a08ed
add JBuffer
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Mon, 07 Nov 2016 22:39:39 -0700 |
| parents | dd71a59fcf72 |
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| rev | line source |
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1 // |
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2 // ======================================================================== |
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
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4 // ------------------------------------------------------------------------ |
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5 // All rights reserved. This program and the accompanying materials |
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6 // are made available under the terms of the Eclipse Public License v1.0 |
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7 // and Apache License v2.0 which accompanies this distribution. |
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8 // |
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9 // The Eclipse Public License is available at |
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10 // http://www.eclipse.org/legal/epl-v10.html |
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11 // |
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12 // The Apache License v2.0 is available at |
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13 // http://www.opensource.org/licenses/apache2.0.php |
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14 // |
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15 // You may elect to redistribute this code under either of these licenses. |
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16 // ======================================================================== |
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17 // |
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18 |
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19 package org.eclipse.jetty.io; |
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20 |
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21 import java.io.IOException; |
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22 import java.io.InputStream; |
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23 import java.io.OutputStream; |
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24 import java.nio.charset.Charset; |
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25 |
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26 import org.eclipse.jetty.util.TypeUtil; |
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27 import org.slf4j.Logger; |
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28 import org.slf4j.LoggerFactory; |
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29 |
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30 /** |
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31 * |
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32 * |
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33 */ |
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34 public abstract class AbstractBuffer implements Buffer |
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35 { |
| 1005 | 36 private static final Logger LOG = LoggerFactory.getLogger(AbstractBuffer.class); |
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37 |
| 1005 | 38 private final static boolean __boundsChecking = Boolean.getBoolean("org.eclipse.jetty.io.AbstractBuffer.boundsChecking"); |
| 39 | |
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40 protected final static String __READONLY = "READONLY"; |
| 1005 | 41 |
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42 int _access; |
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43 |
| 1005 | 44 protected int _get; |
| 45 protected int _put; | |
| 46 protected int _hash; | |
| 47 protected int _hashGet; | |
| 48 protected int _hashPut; | |
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49 |
| 1005 | 50 /** |
| 51 * Constructor for BufferView | |
| 52 * | |
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53 * @param access 1==READONLY, 2==READWRITE |
| 1005 | 54 */ |
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55 protected AbstractBuffer(int access) |
| 1005 | 56 { |
| 57 _access = access; | |
| 58 } | |
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59 |
| 1046 | 60 public final byte[] asArray() |
| 1005 | 61 { |
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62 byte[] bytes = new byte[remaining()]; |
| 1005 | 63 byte[] array = array(); |
| 64 if (array != null) | |
| 65 System.arraycopy(array, getIndex(), bytes, 0, bytes.length); | |
| 66 else | |
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67 peek(getIndex(), bytes, 0, remaining()); |
| 1005 | 68 return bytes; |
| 69 } | |
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70 |
| 1005 | 71 public Buffer buffer() |
| 72 { | |
| 73 return this; | |
| 74 } | |
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75 |
| 1005 | 76 public void clear() |
| 77 { | |
| 78 setGetIndex(0); | |
| 79 setPutIndex(0); | |
| 80 } | |
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81 |
| 1005 | 82 public void compact() |
| 83 { | |
| 84 if (isReadOnly()) throw new IllegalStateException(__READONLY); | |
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85 int s = getIndex(); |
| 1005 | 86 if (s > 0) |
| 87 { | |
| 88 byte array[] = array(); | |
| 89 int length = putIndex() - s; | |
| 90 if (length > 0) | |
| 91 { | |
| 92 if (array != null) | |
| 93 System.arraycopy(array(), s, array(), 0, length); | |
| 94 else | |
| 95 poke(0, peek(s, length)); | |
| 96 } | |
| 97 setGetIndex(getIndex() - s); | |
| 98 setPutIndex(putIndex() - s); | |
| 99 } | |
| 100 } | |
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101 |
| 1005 | 102 @Override |
| 103 public boolean equals(Object obj) | |
| 104 { | |
| 105 if (obj==this) | |
| 106 return true; | |
| 107 | |
| 108 // reject non buffers; | |
| 109 if (obj == null || !(obj instanceof Buffer)) return false; | |
| 110 Buffer b = (Buffer) obj; | |
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111 |
| 1005 | 112 // reject different lengths |
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113 if (b.remaining() != remaining()) return false; |
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114 |
| 1005 | 115 // reject AbstractBuffer with different hash value |
| 116 if (_hash != 0 && obj instanceof AbstractBuffer) | |
| 117 { | |
| 118 AbstractBuffer ab = (AbstractBuffer) obj; | |
| 119 if (ab._hash != 0 && _hash != ab._hash) return false; | |
| 120 } | |
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121 |
| 1005 | 122 // Nothing for it but to do the hard grind. |
| 123 int get=getIndex(); | |
| 124 int bi=b.putIndex(); | |
| 125 for (int i = putIndex(); i-->get;) | |
| 126 { | |
| 127 byte b1 = peek(i); | |
| 128 byte b2 = b.peek(--bi); | |
| 129 if (b1 != b2) return false; | |
| 130 } | |
| 131 return true; | |
| 132 } | |
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133 |
| 1005 | 134 public byte get() |
| 135 { | |
| 136 return peek(_get++); | |
| 137 } | |
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138 |
| 1005 | 139 public int get(byte[] b, int offset, int length) |
| 140 { | |
| 141 int gi = getIndex(); | |
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142 int l=remaining(); |
| 1005 | 143 if (l==0) |
| 144 return -1; | |
| 145 | |
| 146 if (length>l) | |
| 147 length=l; | |
| 148 | |
| 149 length = peek(gi, b, offset, length); | |
| 150 if (length>0) | |
| 151 setGetIndex(gi + length); | |
| 152 return length; | |
| 153 } | |
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154 |
| 1005 | 155 public Buffer get(int length) |
| 156 { | |
| 157 int gi = getIndex(); | |
| 158 Buffer view = peek(gi, length); | |
| 159 setGetIndex(gi + length); | |
| 160 return view; | |
| 161 } | |
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162 |
| 1005 | 163 public final int getIndex() |
| 164 { | |
| 165 return _get; | |
| 166 } | |
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167 |
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168 public boolean hasRemaining() |
| 1005 | 169 { |
| 170 return _put > _get; | |
| 171 } | |
| 172 | |
| 173 @Override | |
| 174 public int hashCode() | |
| 175 { | |
| 176 if (_hash == 0 || _hashGet!=_get || _hashPut!=_put) | |
| 177 { | |
| 178 int get=getIndex(); | |
| 179 byte[] array = array(); | |
| 180 if (array==null) | |
| 181 { | |
| 182 for (int i = putIndex(); i-- >get;) | |
| 183 { | |
| 184 byte b = peek(i); | |
| 185 if ('a' <= b && b <= 'z') | |
| 186 b = (byte) (b - 'a' + 'A'); | |
| 187 _hash = 31 * _hash + b; | |
| 188 } | |
| 189 } | |
| 190 else | |
| 191 { | |
| 192 for (int i = putIndex(); i-- >get;) | |
| 193 { | |
| 194 byte b = array[i]; | |
| 195 if ('a' <= b && b <= 'z') | |
| 196 b = (byte) (b - 'a' + 'A'); | |
| 197 _hash = 31 * _hash + b; | |
| 198 } | |
| 199 } | |
| 200 if (_hash == 0) | |
| 201 _hash = -1; | |
| 202 _hashGet=_get; | |
| 203 _hashPut=_put; | |
| 204 | |
| 205 } | |
| 206 return _hash; | |
| 207 } | |
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208 |
| 1005 | 209 public boolean isReadOnly() |
| 210 { | |
| 211 return _access <= READONLY; | |
| 212 } | |
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213 |
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214 public int remaining() |
| 1005 | 215 { |
| 216 return _put - _get; | |
| 217 } | |
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218 |
| 1005 | 219 public byte peek() |
| 220 { | |
| 221 return peek(_get); | |
| 222 } | |
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223 |
| 1032 | 224 private Buffer peek(int index, int length) |
| 1005 | 225 { |
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226 Buffer view = duplicate(); |
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227 view.setPutIndex(index + length); |
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228 view.setGetIndex(index); |
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229 return view; |
| 1005 | 230 } |
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231 |
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232 @Override |
| 1005 | 233 public int poke(int index, Buffer src) |
| 234 { | |
| 235 _hash=0; | |
| 236 | |
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237 int length=src.remaining(); |
| 1005 | 238 if (index + length > capacity()) |
| 239 { | |
| 240 length=capacity()-index; | |
| 241 /* | |
| 242 if (length<0) | |
| 243 throw new IllegalArgumentException("index>capacity(): " + index + ">" + capacity()); | |
| 244 */ | |
| 245 } | |
| 246 | |
| 247 byte[] src_array = src.array(); | |
| 248 byte[] dst_array = array(); | |
| 249 if (src_array != null && dst_array != null) | |
| 250 System.arraycopy(src_array, src.getIndex(), dst_array, index, length); | |
| 251 else if (src_array != null) | |
| 252 { | |
| 253 int s=src.getIndex(); | |
| 254 for (int i=0;i<length;i++) | |
| 255 poke(index++,src_array[s++]); | |
| 256 } | |
| 257 else if (dst_array != null) | |
| 258 { | |
| 259 int s=src.getIndex(); | |
| 260 for (int i=0;i<length;i++) | |
| 261 dst_array[index++]=src.peek(s++); | |
| 262 } | |
| 263 else | |
| 264 { | |
| 265 int s=src.getIndex(); | |
| 266 for (int i=0;i<length;i++) | |
| 267 poke(index++,src.peek(s++)); | |
| 268 } | |
| 269 | |
| 270 return length; | |
| 271 } | |
| 272 | |
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273 |
| 1005 | 274 public int poke(int index, byte[] b, int offset, int length) |
| 275 { | |
| 276 _hash=0; | |
| 277 if (index + length > capacity()) | |
| 278 { | |
| 279 length=capacity()-index; | |
| 280 /* if (length<0) | |
| 281 throw new IllegalArgumentException("index>capacity(): " + index + ">" + capacity()); | |
| 282 */ | |
| 283 } | |
| 284 | |
| 285 byte[] dst_array = array(); | |
| 286 if (dst_array != null) | |
| 287 System.arraycopy(b, offset, dst_array, index, length); | |
| 288 else | |
| 289 { | |
| 290 int s=offset; | |
| 291 for (int i=0;i<length;i++) | |
| 292 poke(index++,b[s++]); | |
| 293 } | |
| 294 return length; | |
| 295 } | |
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296 |
| 1005 | 297 public int put(Buffer src) |
| 298 { | |
| 299 int pi = putIndex(); | |
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300 int l = poke(pi, src); |
| 1005 | 301 setPutIndex(pi + l); |
| 302 return l; | |
| 303 } | |
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304 |
| 1005 | 305 public void put(byte b) |
| 306 { | |
| 307 int pi = putIndex(); | |
| 308 poke(pi, b); | |
| 309 setPutIndex(pi + 1); | |
| 310 } | |
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311 |
| 1005 | 312 public int put(byte[] b, int offset, int length) |
| 313 { | |
| 314 int pi = putIndex(); | |
| 315 int l = poke(pi, b, offset, length); | |
| 316 setPutIndex(pi + l); | |
| 317 return l; | |
| 318 } | |
| 319 | |
| 320 public int put(byte[] b) | |
| 321 { | |
| 322 int pi = putIndex(); | |
| 323 int l = poke(pi, b, 0, b.length); | |
| 324 setPutIndex(pi + l); | |
| 325 return l; | |
| 326 } | |
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327 |
| 1005 | 328 public final int putIndex() |
| 329 { | |
| 330 return _put; | |
| 331 } | |
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332 |
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333 public final void rewind() |
| 1005 | 334 { |
| 335 setGetIndex(0); | |
| 336 } | |
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337 |
| 1005 | 338 public void setGetIndex(int getIndex) |
| 339 { | |
| 340 _get = getIndex; | |
| 341 _hash=0; | |
| 342 } | |
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343 |
| 1005 | 344 public void setPutIndex(int putIndex) |
| 345 { | |
| 346 _put = putIndex; | |
| 347 _hash=0; | |
| 348 } | |
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349 |
| 1005 | 350 public int skip(int n) |
| 351 { | |
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352 if (remaining() < n) n = remaining(); |
| 1005 | 353 setGetIndex(getIndex() + n); |
| 354 return n; | |
| 355 } | |
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356 |
| 1005 | 357 public Buffer slice() |
| 358 { | |
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359 return peek(getIndex(), remaining()); |
| 1005 | 360 } |
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361 |
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362 public final Buffer sliceFrom(int index) { |
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363 return peek(index, getIndex()-index-1); |
| 1005 | 364 } |
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365 |
| 1005 | 366 public int space() |
| 367 { | |
| 368 return capacity() - _put; | |
| 369 } | |
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370 |
| 1005 | 371 public String toDetailString() |
| 372 { | |
| 373 StringBuilder buf = new StringBuilder(); | |
| 374 buf.append("["); | |
| 375 buf.append(super.hashCode()); | |
| 376 buf.append(","); | |
| 377 buf.append(this.buffer().hashCode()); | |
| 378 buf.append(",g="); | |
| 379 buf.append(getIndex()); | |
| 380 buf.append(",p="); | |
| 381 buf.append(putIndex()); | |
| 382 buf.append(",c="); | |
| 383 buf.append(capacity()); | |
| 384 buf.append("]={"); | |
| 385 int count = 0; | |
| 386 for (int i = getIndex(); i < putIndex(); i++) | |
| 387 { | |
| 388 byte b = peek(i); | |
| 389 TypeUtil.toHex(b,buf); | |
| 390 if (count++ == 50) | |
| 391 { | |
| 392 if (putIndex() - i > 20) | |
| 393 { | |
| 394 buf.append(" ... "); | |
| 395 i = putIndex() - 20; | |
| 396 } | |
| 397 } | |
| 398 } | |
| 399 buf.append('}'); | |
| 400 return buf.toString(); | |
| 401 } | |
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402 |
| 1005 | 403 @Override |
| 404 public String toString() | |
| 405 { | |
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406 return toString("ISO-8859-1"); |
| 1005 | 407 } |
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408 |
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409 @Override |
| 1032 | 410 public final String toString(int index, int length) { |
| 411 return peek(index,length).toString(); | |
| 412 } | |
| 413 | |
| 414 @Override | |
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415 public final String toString(String charset) |
| 1005 | 416 { |
| 417 try | |
| 418 { | |
| 419 byte[] bytes=array(); | |
| 420 if (bytes!=null) | |
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421 return new String(bytes,getIndex(),remaining(),charset); |
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422 return new String(asArray(), 0, remaining(),charset); |
| 1005 | 423 |
| 424 } | |
| 425 catch(Exception e) | |
| 426 { | |
| 427 LOG.warn("",e); | |
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428 return new String(asArray(), 0, remaining()); |
| 1005 | 429 } |
| 430 } | |
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431 |
| 1005 | 432 /* ------------------------------------------------------------ */ |
| 433 public String toDebugString() | |
| 434 { | |
| 435 return getClass()+"@"+super.hashCode(); | |
| 436 } | |
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437 |
| 1005 | 438 /* ------------------------------------------------------------ */ |
| 439 public int readFrom(InputStream in,int max) throws IOException | |
| 440 { | |
| 441 byte[] array = array(); | |
| 442 int s=space(); | |
| 443 if (s>max) | |
| 444 s=max; | |
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445 |
| 1005 | 446 if (array!=null) |
| 447 { | |
| 448 int l=in.read(array,_put,s); | |
| 449 if (l>0) | |
| 450 _put+=l; | |
| 451 return l; | |
| 452 } | |
| 453 else | |
| 454 { | |
| 455 byte[] buf=new byte[s>1024?1024:s]; | |
| 456 int total=0; | |
| 457 while (s>0) | |
| 458 { | |
| 459 int l=in.read(buf,0,buf.length); | |
| 460 if (l<0) | |
| 461 return total>0?total:-1; | |
| 462 int p=put(buf,0,l); | |
| 463 assert l==p; | |
| 464 s-=l; | |
| 465 } | |
| 466 return total; | |
| 467 } | |
| 468 } | |
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469 |
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470 public final Buffer duplicate() { |
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471 return new View(this); |
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472 } |
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473 } |