/usr/include/xercesc/util/RefHashTableOf.c is in libxerces-c2-dev 2.8.0+deb1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 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 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 | /*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: RefHashTableOf.c 568078 2007-08-21 11:43:25Z amassari $
*/
// ---------------------------------------------------------------------------
// Include
// ---------------------------------------------------------------------------
#if defined(XERCES_TMPLSINC)
#include <xercesc/util/RefHashTableOf.hpp>
#endif
#include <xercesc/util/Janitor.hpp>
#include <xercesc/util/NullPointerException.hpp>
#include <assert.h>
#include <new>
XERCES_CPP_NAMESPACE_BEGIN
// ---------------------------------------------------------------------------
// RefHashTableOf: Constructors and Destructor
// ---------------------------------------------------------------------------
template <class TVal>
RefHashTableOf<TVal>::RefHashTableOf( const unsigned int modulus
, const bool adoptElems
, MemoryManager* const manager)
: fMemoryManager(manager)
, fAdoptedElems(adoptElems)
, fBucketList(0)
, fHashModulus(modulus)
, fInitialModulus(modulus)
, fCount(0)
, fHash(0)
{
initialize(modulus);
// create default hasher
fHash = new (fMemoryManager) HashXMLCh();
}
template <class TVal>
RefHashTableOf<TVal>::RefHashTableOf( const unsigned int modulus
, const bool adoptElems
, HashBase* hashBase
, MemoryManager* const manager)
: fMemoryManager(manager)
, fAdoptedElems(adoptElems)
, fBucketList(0)
, fHashModulus(modulus)
, fInitialModulus(modulus)
, fCount(0)
, fHash(0)
{
initialize(modulus);
// set hasher
fHash = hashBase;
}
template <class TVal>
RefHashTableOf<TVal>::RefHashTableOf(const unsigned int modulus
, MemoryManager* const manager)
: fMemoryManager(manager)
, fAdoptedElems(true)
, fBucketList(0)
, fHashModulus(modulus)
, fInitialModulus(modulus)
, fCount(0)
, fHash(0)
{
initialize(modulus);
// create default hasher
fHash = new (fMemoryManager) HashXMLCh();
}
template <class TVal> void RefHashTableOf<TVal>::initialize(const unsigned int modulus)
{
if (modulus == 0)
ThrowXMLwithMemMgr(IllegalArgumentException, XMLExcepts::HshTbl_ZeroModulus, fMemoryManager);
// Allocate the bucket list and zero them
fBucketList = (RefHashTableBucketElem<TVal>**) fMemoryManager->allocate
(
fHashModulus * sizeof(RefHashTableBucketElem<TVal>*)
); //new RefHashTableBucketElem<TVal>*[fHashModulus];
for (unsigned int index = 0; index < fHashModulus; index++)
fBucketList[index] = 0;
}
template <class TVal> RefHashTableOf<TVal>::~RefHashTableOf()
{
cleanup();
}
// ---------------------------------------------------------------------------
// RefHashTableOf: Element management
// ---------------------------------------------------------------------------
template <class TVal> bool RefHashTableOf<TVal>::isEmpty() const
{
return fCount==0;
}
template <class TVal> bool RefHashTableOf<TVal>::
containsKey(const void* const key) const
{
unsigned int hashVal;
const RefHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal);
return (findIt != 0);
}
template <class TVal> void RefHashTableOf<TVal>::
removeKey(const void* const key)
{
// Hash the key
unsigned int hashVal = fHash->getHashVal(key, fHashModulus, fMemoryManager);
assert(hashVal < fHashModulus);
//
// Search the given bucket for this key. Keep up with the previous
// element so we can patch around it.
//
RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
RefHashTableBucketElem<TVal>* lastElem = 0;
while (curElem)
{
if (fHash->equals(key, curElem->fKey))
{
if (!lastElem)
{
// It was the first in the bucket
fBucketList[hashVal] = curElem->fNext;
}
else
{
// Patch around the current element
lastElem->fNext = curElem->fNext;
}
// If we adopted the data, then delete it too
// (Note: the userdata hash table instance has data type of void *.
// This will generate compiler warnings here on some platforms, but they
// can be ignored since fAdoptedElements is false.
if (fAdoptedElems)
delete curElem->fData;
// Then delete the current element and move forward
// delete curElem;
// destructor doesn't do anything...
// curElem->~RefHashTableBucketElem();
fMemoryManager->deallocate(curElem);
fCount--;
return;
}
// Move both pointers upwards
lastElem = curElem;
curElem = curElem->fNext;
}
// We never found that key
ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, fMemoryManager);
}
template <class TVal> void RefHashTableOf<TVal>::removeAll()
{
if(isEmpty())
return;
// Clean up the buckets first
for (unsigned int buckInd = 0; buckInd < fHashModulus; buckInd++)
{
// Get the bucket list head for this entry
RefHashTableBucketElem<TVal>* curElem = fBucketList[buckInd];
RefHashTableBucketElem<TVal>* nextElem;
while (curElem)
{
// Save the next element before we hose this one
nextElem = curElem->fNext;
// If we adopted the data, then delete it too
// (Note: the userdata hash table instance has data type of void *.
// This will generate compiler warnings here on some platforms, but they
// can be ignored since fAdoptedElements is false.
if (fAdoptedElems)
delete curElem->fData;
// Then delete the current element and move forward
// delete curElem;
// destructor doesn't do anything...
// curElem->~RefHashTableBucketElem();
fMemoryManager->deallocate(curElem);
curElem = nextElem;
}
// Clean out this entry
fBucketList[buckInd] = 0;
}
fCount = 0;
}
// This method returns the data associated with a key. The key entry is deleted. The caller
// now owns the returned data (case of hashtable adopting the data).
// This function is called by transferElement so that the undeleted data can be transferred
// to a new key which will own that data.
template <class TVal> TVal* RefHashTableOf<TVal>::
orphanKey(const void* const key)
{
// Hash the key
TVal* retVal = 0;
unsigned int hashVal = fHash->getHashVal(key, fHashModulus, fMemoryManager);
assert(hashVal < fHashModulus);
//
// Search the given bucket for this key. Keep up with the previous
// element so we can patch around it.
//
RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
RefHashTableBucketElem<TVal>* lastElem = 0;
while (curElem)
{
if (fHash->equals(key, curElem->fKey))
{
if (!lastElem)
{
// It was the first in the bucket
fBucketList[hashVal] = curElem->fNext;
}
else
{
// Patch around the current element
lastElem->fNext = curElem->fNext;
}
retVal = curElem->fData;
// Delete the current element
// delete curElem;
// destructor doesn't do anything...
// curElem->~RefHashTableBucketElem();
fMemoryManager->deallocate(curElem);
break;
}
// Move both pointers upwards
lastElem = curElem;
curElem = curElem->fNext;
}
// We never found that key
if (!retVal)
ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::HshTbl_NoSuchKeyExists, fMemoryManager);
return retVal;
}
//
// cleanup():
// similar to destructor
// called to cleanup the memory, in case destructor cannot be called
//
template <class TVal> void RefHashTableOf<TVal>::cleanup()
{
removeAll();
// Then delete the bucket list & hasher
fMemoryManager->deallocate(fBucketList); //delete [] fBucketList;
fBucketList = 0;
delete fHash;
}
//
// reinitialize():
// similar to constructor
// called to re-construct the fElemList from scratch again
//
template <class TVal> void RefHashTableOf<TVal>::reinitialize(HashBase* hashBase)
{
if (fBucketList || fHash)
cleanup();
fHashModulus = fInitialModulus;
initialize(fHashModulus);
if (hashBase)
fHash = hashBase;
else
fHash = new (fMemoryManager) HashXMLCh(); // create default hasher
}
// this function transfer the data from key1 to key2
// this is equivalent to calling
// 1. get(key1) to retrieve the data,
// 2. removeKey(key1),
// 3. and then put(key2, data)
// except that the data is not deleted in "removeKey" even it is adopted so that it
// can be transferred to key2.
// whatever key2 has originally will be purged (if adopted)
template <class TVal> void RefHashTableOf<TVal>::transferElement(const void* const key1, void* key2)
{
put(key2, orphanKey(key1));
}
// ---------------------------------------------------------------------------
// RefHashTableOf: Getters
// ---------------------------------------------------------------------------
template <class TVal> TVal* RefHashTableOf<TVal>::get(const void* const key)
{
unsigned int hashVal;
RefHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal);
if (!findIt)
return 0;
return findIt->fData;
}
template <class TVal> const TVal* RefHashTableOf<TVal>::
get(const void* const key) const
{
unsigned int hashVal;
const RefHashTableBucketElem<TVal>* findIt = findBucketElem(key, hashVal);
if (!findIt)
return 0;
return findIt->fData;
}
template <class TVal>
MemoryManager* RefHashTableOf<TVal>::getMemoryManager() const
{
return fMemoryManager;
}
template <class TVal>
unsigned int RefHashTableOf<TVal>::getHashModulus() const
{
return fHashModulus;
}
template <class TVal>
unsigned int RefHashTableOf<TVal>::getCount() const
{
return fCount;
}
// ---------------------------------------------------------------------------
// RefHashTableOf: Getters
// ---------------------------------------------------------------------------
template <class TVal>
void RefHashTableOf<TVal>::setAdoptElements(const bool aValue)
{
fAdoptedElems = aValue;
}
// ---------------------------------------------------------------------------
// RefHashTableOf: Putters
// ---------------------------------------------------------------------------
template <class TVal> void RefHashTableOf<TVal>::put(void* key, TVal* const valueToAdopt)
{
// Apply 0.75 load factor to find threshold.
unsigned int threshold = fHashModulus * 3 / 4;
// If we've grown too big, expand the table and rehash.
if (fCount >= threshold)
rehash();
// First see if the key exists already
unsigned int hashVal;
RefHashTableBucketElem<TVal>* newBucket = findBucketElem(key, hashVal);
//
// If so,then update its value. If not, then we need to add it to
// the right bucket
//
if (newBucket)
{
if (fAdoptedElems)
delete newBucket->fData;
newBucket->fData = valueToAdopt;
newBucket->fKey = key;
}
else
{
//newBucket = new (fMemoryManager) RefHashTableBucketElem<TVal>(key, valueToAdopt, fBucketList[hashVal]);
newBucket =
new (fMemoryManager->allocate(sizeof(RefHashTableBucketElem<TVal>)))
RefHashTableBucketElem<TVal>(key, valueToAdopt, fBucketList[hashVal]);
fBucketList[hashVal] = newBucket;
fCount++;
}
}
// ---------------------------------------------------------------------------
// RefHashTableOf: Private methods
// ---------------------------------------------------------------------------
template <class TVal> void RefHashTableOf<TVal>::rehash()
{
const unsigned int newMod = fHashModulus * 2;
RefHashTableBucketElem<TVal>** newBucketList =
(RefHashTableBucketElem<TVal>**) fMemoryManager->allocate
(
newMod * sizeof(RefHashTableBucketElem<TVal>*)
);//new RefHashTableBucketElem<TVal>*[newMod];
// Make sure the new bucket list is destroyed if an
// exception is thrown.
ArrayJanitor<RefHashTableBucketElem<TVal>*> guard(newBucketList, fMemoryManager);
memset(newBucketList, 0, newMod * sizeof(newBucketList[0]));
// Rehash all existing entries.
for (unsigned int index = 0; index < fHashModulus; index++)
{
// Get the bucket list head for this entry
RefHashTableBucketElem<TVal>* curElem = fBucketList[index];
while (curElem)
{
// Save the next element before we detach this one
RefHashTableBucketElem<TVal>* const nextElem = curElem->fNext;
const unsigned int hashVal = fHash->getHashVal(curElem->fKey, newMod, fMemoryManager);
assert(hashVal < newMod);
RefHashTableBucketElem<TVal>* const newHeadElem = newBucketList[hashVal];
// Insert at the start of this bucket's list.
curElem->fNext = newHeadElem;
newBucketList[hashVal] = curElem;
curElem = nextElem;
}
}
RefHashTableBucketElem<TVal>** const oldBucketList = fBucketList;
// Everything is OK at this point, so update the
// member variables.
fBucketList = guard.release();
fHashModulus = newMod;
// Delete the old bucket list.
fMemoryManager->deallocate(oldBucketList);//delete[] oldBucketList;
}
template <class TVal> RefHashTableBucketElem<TVal>* RefHashTableOf<TVal>::
findBucketElem(const void* const key, unsigned int& hashVal)
{
// Hash the key
hashVal = fHash->getHashVal(key, fHashModulus, fMemoryManager);
assert(hashVal < fHashModulus);
// Search that bucket for the key
RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
while (curElem)
{
if (fHash->equals(key, curElem->fKey))
return curElem;
curElem = curElem->fNext;
}
return 0;
}
template <class TVal> const RefHashTableBucketElem<TVal>* RefHashTableOf<TVal>::
findBucketElem(const void* const key, unsigned int& hashVal) const
{
// Hash the key
hashVal = fHash->getHashVal(key, fHashModulus, fMemoryManager);
assert(hashVal < fHashModulus);
// Search that bucket for the key
const RefHashTableBucketElem<TVal>* curElem = fBucketList[hashVal];
while (curElem)
{
if (fHash->equals(key, curElem->fKey))
return curElem;
curElem = curElem->fNext;
}
return 0;
}
// ---------------------------------------------------------------------------
// RefHashTableOfEnumerator: Constructors and Destructor
// ---------------------------------------------------------------------------
template <class TVal> RefHashTableOfEnumerator<TVal>::
RefHashTableOfEnumerator(RefHashTableOf<TVal>* const toEnum
, const bool adopt
, MemoryManager* const manager)
: fAdopted(adopt), fCurElem(0), fCurHash((unsigned int)-1), fToEnum(toEnum)
, fMemoryManager(manager)
{
if (!toEnum)
ThrowXMLwithMemMgr(NullPointerException, XMLExcepts::CPtr_PointerIsZero, fMemoryManager);
//
// Find the next available bucket element in the hash table. If it
// comes back zero, that just means the table is empty.
//
// Note that the -1 in the current hash tells it to start from the
// beginning.
//
findNext();
}
template <class TVal> RefHashTableOfEnumerator<TVal>::~RefHashTableOfEnumerator()
{
if (fAdopted)
delete fToEnum;
}
template <class TVal> RefHashTableOfEnumerator<TVal>::
RefHashTableOfEnumerator(const RefHashTableOfEnumerator<TVal>& toCopy) :
XMLEnumerator<TVal>(toCopy)
, XMemory(toCopy)
, fAdopted(toCopy.fAdopted)
, fCurElem(toCopy.fCurElem)
, fCurHash(toCopy.fCurHash)
, fToEnum(toCopy.fToEnum)
, fMemoryManager(toCopy.fMemoryManager)
{
}
// ---------------------------------------------------------------------------
// RefHashTableOfEnumerator: Enum interface
// ---------------------------------------------------------------------------
template <class TVal> bool RefHashTableOfEnumerator<TVal>::hasMoreElements() const
{
//
// If our current has is at the max and there are no more elements
// in the current bucket, then no more elements.
//
if (!fCurElem && (fCurHash == fToEnum->fHashModulus))
return false;
return true;
}
template <class TVal> TVal& RefHashTableOfEnumerator<TVal>::nextElement()
{
// Make sure we have an element to return
if (!hasMoreElements())
ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::Enum_NoMoreElements, fMemoryManager);
//
// Save the current element, then move up to the next one for the
// next time around.
//
RefHashTableBucketElem<TVal>* saveElem = fCurElem;
findNext();
return *saveElem->fData;
}
template <class TVal> void* RefHashTableOfEnumerator<TVal>::nextElementKey()
{
// Make sure we have an element to return
if (!hasMoreElements())
ThrowXMLwithMemMgr(NoSuchElementException, XMLExcepts::Enum_NoMoreElements, fMemoryManager);
//
// Save the current element, then move up to the next one for the
// next time around.
//
RefHashTableBucketElem<TVal>* saveElem = fCurElem;
findNext();
return saveElem->fKey;
}
template <class TVal> void RefHashTableOfEnumerator<TVal>::Reset()
{
fCurHash = (unsigned int)-1;
fCurElem = 0;
findNext();
}
// ---------------------------------------------------------------------------
// RefHashTableOfEnumerator: Private helper methods
// ---------------------------------------------------------------------------
template <class TVal> void RefHashTableOfEnumerator<TVal>::findNext()
{
//
// If there is a current element, move to its next element. If this
// hits the end of the bucket, the next block will handle the rest.
//
if (fCurElem)
fCurElem = fCurElem->fNext;
//
// If the current element is null, then we have to move up to the
// next hash value. If that is the hash modulus, then we cannot
// go further.
//
if (!fCurElem)
{
fCurHash++;
if (fCurHash == fToEnum->fHashModulus)
return;
// Else find the next non-empty bucket
while (fToEnum->fBucketList[fCurHash]==0)
{
// Bump to the next hash value. If we max out return
fCurHash++;
if (fCurHash == fToEnum->fHashModulus)
return;
}
fCurElem = fToEnum->fBucketList[fCurHash];
}
}
XERCES_CPP_NAMESPACE_END
|