1 /* 2 ****************************************************************************** 3 * Copyright (C) 1996-2010, International Business Machines Corporation and 4 * others. All Rights Reserved. 5 ****************************************************************************** 6 */ 7 8 /** 9 * \file 10 * \brief C++ API: RuleBasedCollator class provides the simple implementation of Collator. 11 */ 12 13 /** 14 * File tblcoll.h 15 * 16 * Created by: Helena Shih 17 * 18 * Modification History: 19 * 20 * Date Name Description 21 * 2/5/97 aliu Added streamIn and streamOut methods. Added 22 * constructor which reads RuleBasedCollator object from 23 * a binary file. Added writeToFile method which streams 24 * RuleBasedCollator out to a binary file. The streamIn 25 * and streamOut methods use istream and ostream objects 26 * in binary mode. 27 * 2/12/97 aliu Modified to use TableCollationData sub-object to 28 * hold invariant data. 29 * 2/13/97 aliu Moved several methods into this class from Collation. 30 * Added a private RuleBasedCollator(Locale&) constructor, 31 * to be used by Collator::createDefault(). General 32 * clean up. 33 * 2/20/97 helena Added clone, operator==, operator!=, operator=, and copy 34 * constructor and getDynamicClassID. 35 * 3/5/97 aliu Modified constructFromFile() to add parameter 36 * specifying whether or not binary loading is to be 37 * attempted. This is required for dynamic rule loading. 38 * 05/07/97 helena Added memory allocation error detection. 39 * 6/17/97 helena Added IDENTICAL strength for compare, changed getRules to 40 * use MergeCollation::getPattern. 41 * 6/20/97 helena Java class name change. 42 * 8/18/97 helena Added internal API documentation. 43 * 09/03/97 helena Added createCollationKeyValues(). 44 * 02/10/98 damiba Added compare with "length" parameter 45 * 08/05/98 erm Synched with 1.2 version of RuleBasedCollator.java 46 * 04/23/99 stephen Removed EDecompositionMode, merged with 47 * Normalizer::EMode 48 * 06/14/99 stephen Removed kResourceBundleSuffix 49 * 11/02/99 helena Collator performance enhancements. Eliminates the 50 * UnicodeString construction and special case for NO_OP. 51 * 11/23/99 srl More performance enhancements. Updates to NormalizerIterator 52 * internal state management. 53 * 12/15/99 aliu Update to support Thai collation. Move NormalizerIterator 54 * to implementation file. 55 * 01/29/01 synwee Modified into a C++ wrapper which calls C API 56 * (ucol.h) 57 */ 58 59 #ifndef TBLCOLL_H 60 #define TBLCOLL_H 61 62 #include "unicode/utypes.h" 63 64 65 #if !UCONFIG_NO_COLLATION 66 67 #include "unicode/coll.h" 68 #include "unicode/ucol.h" 69 #include "unicode/sortkey.h" 70 #include "unicode/normlzr.h" 71 72 U_NAMESPACE_BEGIN 73 74 /** 75 * @stable ICU 2.0 76 */ 77 class StringSearch; 78 /** 79 * @stable ICU 2.0 80 */ 81 class CollationElementIterator; 82 83 /** 84 * The RuleBasedCollator class provides the simple implementation of 85 * Collator, using data-driven tables. The user can create a customized 86 * table-based collation. 87 * <P> 88 * <em>Important: </em>The ICU collation service has been reimplemented 89 * in order to achieve better performance and UCA compliance. 90 * For details, see the 91 * <a href="http://source.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm"> 92 * collation design document</a>. 93 * <p> 94 * RuleBasedCollator is a thin C++ wrapper over the C implementation. 95 * <p> 96 * For more information about the collation service see 97 * <a href="http://icu-project.org/userguide/Collate_Intro.html">the users guide</a>. 98 * <p> 99 * Collation service provides correct sorting orders for most locales supported in ICU. 100 * If specific data for a locale is not available, the orders eventually falls back 101 * to the <a href="http://www.unicode.org/unicode/reports/tr10/">UCA sort order</a>. 102 * <p> 103 * Sort ordering may be customized by providing your own set of rules. For more on 104 * this subject see the <a href="http://icu-project.org/userguide/Collate_Customization.html"> 105 * Collation customization</a> section of the users guide. 106 * <p> 107 * Note, RuleBasedCollator is not to be subclassed. 108 * @see Collator 109 * @version 2.0 11/15/2001 110 */ 111 class U_I18N_API RuleBasedCollator : public Collator 112 { 113 public: 114 115 // constructor ------------------------------------------------------------- 116 117 /** 118 * RuleBasedCollator constructor. This takes the table rules and builds a 119 * collation table out of them. Please see RuleBasedCollator class 120 * description for more details on the collation rule syntax. 121 * @param rules the collation rules to build the collation table from. 122 * @param status reporting a success or an error. 123 * @see Locale 124 * @stable ICU 2.0 125 */ 126 RuleBasedCollator(const UnicodeString& rules, UErrorCode& status); 127 128 /** 129 * RuleBasedCollator constructor. This takes the table rules and builds a 130 * collation table out of them. Please see RuleBasedCollator class 131 * description for more details on the collation rule syntax. 132 * @param rules the collation rules to build the collation table from. 133 * @param collationStrength default strength for comparison 134 * @param status reporting a success or an error. 135 * @see Locale 136 * @stable ICU 2.0 137 */ 138 RuleBasedCollator(const UnicodeString& rules, 139 ECollationStrength collationStrength, 140 UErrorCode& status); 141 142 /** 143 * RuleBasedCollator constructor. This takes the table rules and builds a 144 * collation table out of them. Please see RuleBasedCollator class 145 * description for more details on the collation rule syntax. 146 * @param rules the collation rules to build the collation table from. 147 * @param decompositionMode the normalisation mode 148 * @param status reporting a success or an error. 149 * @see Locale 150 * @stable ICU 2.0 151 */ 152 RuleBasedCollator(const UnicodeString& rules, 153 UColAttributeValue decompositionMode, 154 UErrorCode& status); 155 156 /** 157 * RuleBasedCollator constructor. This takes the table rules and builds a 158 * collation table out of them. Please see RuleBasedCollator class 159 * description for more details on the collation rule syntax. 160 * @param rules the collation rules to build the collation table from. 161 * @param collationStrength default strength for comparison 162 * @param decompositionMode the normalisation mode 163 * @param status reporting a success or an error. 164 * @see Locale 165 * @stable ICU 2.0 166 */ 167 RuleBasedCollator(const UnicodeString& rules, 168 ECollationStrength collationStrength, 169 UColAttributeValue decompositionMode, 170 UErrorCode& status); 171 172 /** 173 * Copy constructor. 174 * @param other the RuleBasedCollator object to be copied 175 * @see Locale 176 * @stable ICU 2.0 177 */ 178 RuleBasedCollator(const RuleBasedCollator& other); 179 180 181 /** Opens a collator from a collator binary image created using 182 * cloneBinary. Binary image used in instantiation of the 183 * collator remains owned by the user and should stay around for 184 * the lifetime of the collator. The API also takes a base collator 185 * which usualy should be UCA. 186 * @param bin binary image owned by the user and required through the 187 * lifetime of the collator 188 * @param length size of the image. If negative, the API will try to 189 * figure out the length of the image 190 * @param base fallback collator, usually UCA. Base is required to be 191 * present through the lifetime of the collator. Currently 192 * it cannot be NULL. 193 * @param status for catching errors 194 * @return newly created collator 195 * @see cloneBinary 196 * @stable ICU 3.4 197 */ 198 RuleBasedCollator(const uint8_t *bin, int32_t length, 199 const RuleBasedCollator *base, 200 UErrorCode &status); 201 // destructor -------------------------------------------------------------- 202 203 /** 204 * Destructor. 205 * @stable ICU 2.0 206 */ 207 virtual ~RuleBasedCollator(); 208 209 // public methods ---------------------------------------------------------- 210 211 /** 212 * Assignment operator. 213 * @param other other RuleBasedCollator object to compare with. 214 * @stable ICU 2.0 215 */ 216 RuleBasedCollator& operator=(const RuleBasedCollator& other); 217 218 /** 219 * Returns true if argument is the same as this object. 220 * @param other Collator object to be compared. 221 * @return true if arguments is the same as this object. 222 * @stable ICU 2.0 223 */ 224 virtual UBool operator==(const Collator& other) const; 225 226 /** 227 * Returns true if argument is not the same as this object. 228 * @param other Collator object to be compared 229 * @return returns true if argument is not the same as this object. 230 * @stable ICU 2.0 231 */ 232 virtual UBool operator!=(const Collator& other) const; 233 234 /** 235 * Makes a deep copy of the object. 236 * The caller owns the returned object. 237 * @return the cloned object. 238 * @stable ICU 2.0 239 */ 240 virtual Collator* clone(void) const; 241 242 /** 243 * Creates a collation element iterator for the source string. The caller of 244 * this method is responsible for the memory management of the return 245 * pointer. 246 * @param source the string over which the CollationElementIterator will 247 * iterate. 248 * @return the collation element iterator of the source string using this as 249 * the based Collator. 250 * @stable ICU 2.2 251 */ 252 virtual CollationElementIterator* createCollationElementIterator( 253 const UnicodeString& source) const; 254 255 /** 256 * Creates a collation element iterator for the source. The caller of this 257 * method is responsible for the memory management of the returned pointer. 258 * @param source the CharacterIterator which produces the characters over 259 * which the CollationElementItgerator will iterate. 260 * @return the collation element iterator of the source using this as the 261 * based Collator. 262 * @stable ICU 2.2 263 */ 264 virtual CollationElementIterator* createCollationElementIterator( 265 const CharacterIterator& source) const; 266 267 /** 268 * Compares a range of character data stored in two different strings based 269 * on the collation rules. Returns information about whether a string is 270 * less than, greater than or equal to another string in a language. 271 * This can be overriden in a subclass. 272 * @param source the source string. 273 * @param target the target string to be compared with the source string. 274 * @return the comparison result. GREATER if the source string is greater 275 * than the target string, LESS if the source is less than the 276 * target. Otherwise, returns EQUAL. 277 * @deprecated ICU 2.6 Use overload with UErrorCode& 278 */ 279 virtual EComparisonResult compare(const UnicodeString& source, 280 const UnicodeString& target) const; 281 282 283 /** 284 * The comparison function compares the character data stored in two 285 * different strings. Returns information about whether a string is less 286 * than, greater than or equal to another string. 287 * @param source the source string to be compared with. 288 * @param target the string that is to be compared with the source string. 289 * @param status possible error code 290 * @return Returns an enum value. UCOL_GREATER if source is greater 291 * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less 292 * than target 293 * @stable ICU 2.6 294 **/ 295 virtual UCollationResult compare(const UnicodeString& source, 296 const UnicodeString& target, 297 UErrorCode &status) const; 298 299 /** 300 * Compares a range of character data stored in two different strings based 301 * on the collation rules up to the specified length. Returns information 302 * about whether a string is less than, greater than or equal to another 303 * string in a language. This can be overriden in a subclass. 304 * @param source the source string. 305 * @param target the target string to be compared with the source string. 306 * @param length compares up to the specified length 307 * @return the comparison result. GREATER if the source string is greater 308 * than the target string, LESS if the source is less than the 309 * target. Otherwise, returns EQUAL. 310 * @deprecated ICU 2.6 Use overload with UErrorCode& 311 */ 312 virtual EComparisonResult compare(const UnicodeString& source, 313 const UnicodeString& target, 314 int32_t length) const; 315 316 /** 317 * Does the same thing as compare but limits the comparison to a specified 318 * length 319 * @param source the source string to be compared with. 320 * @param target the string that is to be compared with the source string. 321 * @param length the length the comparison is limited to 322 * @param status possible error code 323 * @return Returns an enum value. UCOL_GREATER if source (up to the specified 324 * length) is greater than target; UCOL_EQUAL if source (up to specified 325 * length) is equal to target; UCOL_LESS if source (up to the specified 326 * length) is less than target. 327 * @stable ICU 2.6 328 */ 329 virtual UCollationResult compare(const UnicodeString& source, 330 const UnicodeString& target, 331 int32_t length, 332 UErrorCode &status) const; 333 334 /** 335 * The comparison function compares the character data stored in two 336 * different string arrays. Returns information about whether a string array 337 * is less than, greater than or equal to another string array. 338 * <p>Example of use: 339 * <pre> 340 * . UChar ABC[] = {0x41, 0x42, 0x43, 0}; // = "ABC" 341 * . UChar abc[] = {0x61, 0x62, 0x63, 0}; // = "abc" 342 * . UErrorCode status = U_ZERO_ERROR; 343 * . Collator *myCollation = 344 * . Collator::createInstance(Locale::US, status); 345 * . if (U_FAILURE(status)) return; 346 * . myCollation->setStrength(Collator::PRIMARY); 347 * . // result would be Collator::EQUAL ("abc" == "ABC") 348 * . // (no primary difference between "abc" and "ABC") 349 * . Collator::EComparisonResult result = 350 * . myCollation->compare(abc, 3, ABC, 3); 351 * . myCollation->setStrength(Collator::TERTIARY); 352 * . // result would be Collator::LESS ("abc" <<< "ABC") 353 * . // (with tertiary difference between "abc" and "ABC") 354 * . result = myCollation->compare(abc, 3, ABC, 3); 355 * </pre> 356 * @param source the source string array to be compared with. 357 * @param sourceLength the length of the source string array. If this value 358 * is equal to -1, the string array is null-terminated. 359 * @param target the string that is to be compared with the source string. 360 * @param targetLength the length of the target string array. If this value 361 * is equal to -1, the string array is null-terminated. 362 * @return Returns a byte value. GREATER if source is greater than target; 363 * EQUAL if source is equal to target; LESS if source is less than 364 * target 365 * @deprecated ICU 2.6 Use overload with UErrorCode& 366 */ 367 virtual EComparisonResult compare(const UChar* source, int32_t sourceLength, 368 const UChar* target, int32_t targetLength) 369 const; 370 371 /** 372 * The comparison function compares the character data stored in two 373 * different string arrays. Returns information about whether a string array 374 * is less than, greater than or equal to another string array. 375 * @param source the source string array to be compared with. 376 * @param sourceLength the length of the source string array. If this value 377 * is equal to -1, the string array is null-terminated. 378 * @param target the string that is to be compared with the source string. 379 * @param targetLength the length of the target string array. If this value 380 * is equal to -1, the string array is null-terminated. 381 * @param status possible error code 382 * @return Returns an enum value. UCOL_GREATER if source is greater 383 * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less 384 * than target 385 * @stable ICU 2.6 386 */ 387 virtual UCollationResult compare(const UChar* source, int32_t sourceLength, 388 const UChar* target, int32_t targetLength, 389 UErrorCode &status) const; 390 391 /** 392 * Compares two strings using the Collator. 393 * Returns whether the first one compares less than/equal to/greater than 394 * the second one. 395 * This version takes UCharIterator input. 396 * @param sIter the first ("source") string iterator 397 * @param tIter the second ("target") string iterator 398 * @param status ICU status 399 * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER 400 * @stable ICU 4.2 401 */ 402 virtual UCollationResult compare(UCharIterator &sIter, 403 UCharIterator &tIter, 404 UErrorCode &status) const; 405 406 /** 407 * Transforms a specified region of the string into a series of characters 408 * that can be compared with CollationKey.compare. Use a CollationKey when 409 * you need to do repeated comparisions on the same string. For a single 410 * comparison the compare method will be faster. 411 * @param source the source string. 412 * @param key the transformed key of the source string. 413 * @param status the error code status. 414 * @return the transformed key. 415 * @see CollationKey 416 * @deprecated ICU 2.8 Use getSortKey(...) instead 417 */ 418 virtual CollationKey& getCollationKey(const UnicodeString& source, 419 CollationKey& key, 420 UErrorCode& status) const; 421 422 /** 423 * Transforms a specified region of the string into a series of characters 424 * that can be compared with CollationKey.compare. Use a CollationKey when 425 * you need to do repeated comparisions on the same string. For a single 426 * comparison the compare method will be faster. 427 * @param source the source string. 428 * @param sourceLength the length of the source string. 429 * @param key the transformed key of the source string. 430 * @param status the error code status. 431 * @return the transformed key. 432 * @see CollationKey 433 * @deprecated ICU 2.8 Use getSortKey(...) instead 434 */ 435 virtual CollationKey& getCollationKey(const UChar *source, 436 int32_t sourceLength, 437 CollationKey& key, 438 UErrorCode& status) const; 439 440 /** 441 * Generates the hash code for the rule-based collation object. 442 * @return the hash code. 443 * @stable ICU 2.0 444 */ 445 virtual int32_t hashCode(void) const; 446 447 /** 448 * Gets the locale of the Collator 449 * @param type can be either requested, valid or actual locale. For more 450 * information see the definition of ULocDataLocaleType in 451 * uloc.h 452 * @param status the error code status. 453 * @return locale where the collation data lives. If the collator 454 * was instantiated from rules, locale is empty. 455 * @deprecated ICU 2.8 likely to change in ICU 3.0, based on feedback 456 */ 457 virtual const Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const; 458 459 /** 460 * Gets the table-based rules for the collation object. 461 * @return returns the collation rules that the table collation object was 462 * created from. 463 * @stable ICU 2.0 464 */ 465 const UnicodeString& getRules(void) const; 466 467 /** 468 * Gets the version information for a Collator. 469 * @param info the version # information, the result will be filled in 470 * @stable ICU 2.0 471 */ 472 virtual void getVersion(UVersionInfo info) const; 473 474 /** 475 * Return the maximum length of any expansion sequences that end with the 476 * specified comparison order. 477 * @param order a collation order returned by previous or next. 478 * @return maximum size of the expansion sequences ending with the collation 479 * element or 1 if collation element does not occur at the end of 480 * any expansion sequence 481 * @see CollationElementIterator#getMaxExpansion 482 * @stable ICU 2.0 483 */ 484 int32_t getMaxExpansion(int32_t order) const; 485 486 /** 487 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This 488 * method is to implement a simple version of RTTI, since not all C++ 489 * compilers support genuine RTTI. Polymorphic operator==() and clone() 490 * methods call this method. 491 * @return The class ID for this object. All objects of a given class have 492 * the same class ID. Objects of other classes have different class 493 * IDs. 494 * @stable ICU 2.0 495 */ 496 virtual UClassID getDynamicClassID(void) const; 497 498 /** 499 * Returns the class ID for this class. This is useful only for comparing to 500 * a return value from getDynamicClassID(). For example: 501 * <pre> 502 * Base* polymorphic_pointer = createPolymorphicObject(); 503 * if (polymorphic_pointer->getDynamicClassID() == 504 * Derived::getStaticClassID()) ... 505 * </pre> 506 * @return The class ID for all objects of this class. 507 * @stable ICU 2.0 508 */ 509 static UClassID U_EXPORT2 getStaticClassID(void); 510 511 /** 512 * Returns the binary format of the class's rules. The format is that of 513 * .col files. 514 * @param length Returns the length of the data, in bytes 515 * @param status the error code status. 516 * @return memory, owned by the caller, of size 'length' bytes. 517 * @stable ICU 2.2 518 */ 519 uint8_t *cloneRuleData(int32_t &length, UErrorCode &status); 520 521 522 /** Creates a binary image of a collator. This binary image can be stored and 523 * later used to instantiate a collator using ucol_openBinary. 524 * This API supports preflighting. 525 * @param buffer a fill-in buffer to receive the binary image 526 * @param capacity capacity of the destination buffer 527 * @param status for catching errors 528 * @return size of the image 529 * @see ucol_openBinary 530 * @stable ICU 3.4 531 */ 532 int32_t cloneBinary(uint8_t *buffer, int32_t capacity, UErrorCode &status); 533 534 /** 535 * Returns current rules. Delta defines whether full rules are returned or 536 * just the tailoring. 537 * @param delta one of UCOL_TAILORING_ONLY, UCOL_FULL_RULES. 538 * @param buffer UnicodeString to store the result rules 539 * @stable ICU 2.2 540 */ 541 void getRules(UColRuleOption delta, UnicodeString &buffer); 542 543 /** 544 * Universal attribute setter 545 * @param attr attribute type 546 * @param value attribute value 547 * @param status to indicate whether the operation went on smoothly or there were errors 548 * @stable ICU 2.2 549 */ 550 virtual void setAttribute(UColAttribute attr, UColAttributeValue value, 551 UErrorCode &status); 552 553 /** 554 * Universal attribute getter. 555 * @param attr attribute type 556 * @param status to indicate whether the operation went on smoothly or there were errors 557 * @return attribute value 558 * @stable ICU 2.2 559 */ 560 virtual UColAttributeValue getAttribute(UColAttribute attr, 561 UErrorCode &status); 562 563 /** 564 * Sets the variable top to a collation element value of a string supplied. 565 * @param varTop one or more (if contraction) UChars to which the variable top should be set 566 * @param len length of variable top string. If -1 it is considered to be zero terminated. 567 * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br> 568 * U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such a contraction<br> 569 * U_PRIMARY_TOO_LONG_ERROR if the primary for the variable top has more than two bytes 570 * @return a 32 bit value containing the value of the variable top in upper 16 bits. Lower 16 bits are undefined 571 * @stable ICU 2.0 572 */ 573 virtual uint32_t setVariableTop(const UChar *varTop, int32_t len, UErrorCode &status); 574 575 /** 576 * Sets the variable top to a collation element value of a string supplied. 577 * @param varTop an UnicodeString size 1 or more (if contraction) of UChars to which the variable top should be set 578 * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br> 579 * U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such a contraction<br> 580 * U_PRIMARY_TOO_LONG_ERROR if the primary for the variable top has more than two bytes 581 * @return a 32 bit value containing the value of the variable top in upper 16 bits. Lower 16 bits are undefined 582 * @stable ICU 2.0 583 */ 584 virtual uint32_t setVariableTop(const UnicodeString varTop, UErrorCode &status); 585 586 /** 587 * Sets the variable top to a collation element value supplied. Variable top is set to the upper 16 bits. 588 * Lower 16 bits are ignored. 589 * @param varTop CE value, as returned by setVariableTop or ucol)getVariableTop 590 * @param status error code (not changed by function) 591 * @stable ICU 2.0 592 */ 593 virtual void setVariableTop(const uint32_t varTop, UErrorCode &status); 594 595 /** 596 * Gets the variable top value of a Collator. 597 * Lower 16 bits are undefined and should be ignored. 598 * @param status error code (not changed by function). If error code is set, the return value is undefined. 599 * @stable ICU 2.0 600 */ 601 virtual uint32_t getVariableTop(UErrorCode &status) const; 602 603 /** 604 * Get an UnicodeSet that contains all the characters and sequences tailored in 605 * this collator. 606 * @param status error code of the operation 607 * @return a pointer to a UnicodeSet object containing all the 608 * code points and sequences that may sort differently than 609 * in the UCA. The object must be disposed of by using delete 610 * @stable ICU 2.4 611 */ 612 virtual UnicodeSet *getTailoredSet(UErrorCode &status) const; 613 614 /** 615 * Thread safe cloning operation. 616 * @return pointer to the new clone, user should remove it. 617 * @stable ICU 2.2 618 */ 619 virtual Collator* safeClone(void); 620 621 /** 622 * Get the sort key as an array of bytes from an UnicodeString. 623 * @param source string to be processed. 624 * @param result buffer to store result in. If NULL, number of bytes needed 625 * will be returned. 626 * @param resultLength length of the result buffer. If if not enough the 627 * buffer will be filled to capacity. 628 * @return Number of bytes needed for storing the sort key 629 * @stable ICU 2.0 630 */ 631 virtual int32_t getSortKey(const UnicodeString& source, uint8_t *result, 632 int32_t resultLength) const; 633 634 /** 635 * Get the sort key as an array of bytes from an UChar buffer. 636 * @param source string to be processed. 637 * @param sourceLength length of string to be processed. If -1, the string 638 * is 0 terminated and length will be decided by the function. 639 * @param result buffer to store result in. If NULL, number of bytes needed 640 * will be returned. 641 * @param resultLength length of the result buffer. If if not enough the 642 * buffer will be filled to capacity. 643 * @return Number of bytes needed for storing the sort key 644 * @stable ICU 2.2 645 */ 646 virtual int32_t getSortKey(const UChar *source, int32_t sourceLength, 647 uint8_t *result, int32_t resultLength) const; 648 649 /** 650 * Determines the minimum strength that will be use in comparison or 651 * transformation. 652 * <p>E.g. with strength == SECONDARY, the tertiary difference is ignored 653 * <p>E.g. with strength == PRIMARY, the secondary and tertiary difference 654 * are ignored. 655 * @return the current comparison level. 656 * @see RuleBasedCollator#setStrength 657 * @deprecated ICU 2.6 Use getAttribute(UCOL_STRENGTH...) instead 658 */ 659 virtual ECollationStrength getStrength(void) const; 660 661 /** 662 * Sets the minimum strength to be used in comparison or transformation. 663 * @see RuleBasedCollator#getStrength 664 * @param newStrength the new comparison level. 665 * @deprecated ICU 2.6 Use setAttribute(UCOL_STRENGTH...) instead 666 */ 667 virtual void setStrength(ECollationStrength newStrength); 668 669 /** 670 * Get the current reordering of scripts (if one has been set). 671 * @param dest The array to fill with the script ordering. 672 * @param destCapacity The length of dest. If it is 0, then dest may be NULL and the function will only return the length of the result without writing any of the result string (pre-flighting). 673 * @param pErrorCode Must be a valid pointer to an error code value, which must not indicate a failure before the function call. 674 * @return The length of the array of the script ordering. 675 * @see ucol_getReorderCodes 676 * @internal 677 */ 678 virtual int32_t getReorderCodes(int32_t* dest, 679 int32_t destCapacity, 680 UErrorCode& status) const; 681 682 /** 683 * Set the ordering of scripts for this collator. 684 * @param reorderCodes An array of script codes in the new order. 685 * @param reorderCodesLength The length of reorderCodes. 686 * @see ucol_setReorderCodes 687 * @internal 688 */ 689 virtual void setReorderCodes(const int32_t* reorderCodes, 690 int32_t reorderCodesLength, 691 UErrorCode& status); 692 693 694 private: 695 696 // private static constants ----------------------------------------------- 697 698 enum { 699 /* need look up in .commit() */ 700 CHARINDEX = 0x70000000, 701 /* Expand index follows */ 702 EXPANDCHARINDEX = 0x7E000000, 703 /* contract indexes follows */ 704 CONTRACTCHARINDEX = 0x7F000000, 705 /* unmapped character values */ 706 UNMAPPED = 0xFFFFFFFF, 707 /* primary strength increment */ 708 PRIMARYORDERINCREMENT = 0x00010000, 709 /* secondary strength increment */ 710 SECONDARYORDERINCREMENT = 0x00000100, 711 /* tertiary strength increment */ 712 TERTIARYORDERINCREMENT = 0x00000001, 713 /* mask off anything but primary order */ 714 PRIMARYORDERMASK = 0xffff0000, 715 /* mask off anything but secondary order */ 716 SECONDARYORDERMASK = 0x0000ff00, 717 /* mask off anything but tertiary order */ 718 TERTIARYORDERMASK = 0x000000ff, 719 /* mask off ignorable char order */ 720 IGNORABLEMASK = 0x0000ffff, 721 /* use only the primary difference */ 722 PRIMARYDIFFERENCEONLY = 0xffff0000, 723 /* use only the primary and secondary difference */ 724 SECONDARYDIFFERENCEONLY = 0xffffff00, 725 /* primary order shift */ 726 PRIMARYORDERSHIFT = 16, 727 /* secondary order shift */ 728 SECONDARYORDERSHIFT = 8, 729 /* starting value for collation elements */ 730 COLELEMENTSTART = 0x02020202, 731 /* testing mask for primary low element */ 732 PRIMARYLOWZEROMASK = 0x00FF0000, 733 /* reseting value for secondaries and tertiaries */ 734 RESETSECONDARYTERTIARY = 0x00000202, 735 /* reseting value for tertiaries */ 736 RESETTERTIARY = 0x00000002, 737 738 PRIMIGNORABLE = 0x0202 739 }; 740 741 // private data members --------------------------------------------------- 742 743 UBool dataIsOwned; 744 745 UBool isWriteThroughAlias; 746 747 /** 748 * c struct for collation. All initialisation for it has to be done through 749 * setUCollator(). 750 */ 751 UCollator *ucollator; 752 753 /** 754 * Rule UnicodeString 755 */ 756 UnicodeString urulestring; 757 758 // friend classes -------------------------------------------------------- 759 760 /** 761 * Used to iterate over collation elements in a character source. 762 */ 763 friend class CollationElementIterator; 764 765 /** 766 * Collator ONLY needs access to RuleBasedCollator(const Locale&, 767 * UErrorCode&) 768 */ 769 friend class Collator; 770 771 /** 772 * Searching over collation elements in a character source 773 */ 774 friend class StringSearch; 775 776 // private constructors -------------------------------------------------- 777 778 /** 779 * Default constructor 780 */ 781 RuleBasedCollator(); 782 783 /** 784 * RuleBasedCollator constructor. This constructor takes a locale. The 785 * only caller of this class should be Collator::createInstance(). If 786 * createInstance() happens to know that the requested locale's collation is 787 * implemented as a RuleBasedCollator, it can then call this constructor. 788 * OTHERWISE IT SHOULDN'T, since this constructor ALWAYS RETURNS A VALID 789 * COLLATION TABLE. It does this by falling back to defaults. 790 * @param desiredLocale locale used 791 * @param status error code status 792 */ 793 RuleBasedCollator(const Locale& desiredLocale, UErrorCode& status); 794 795 /** 796 * common constructor implementation 797 * 798 * @param rules the collation rules to build the collation table from. 799 * @param collationStrength default strength for comparison 800 * @param decompositionMode the normalisation mode 801 * @param status reporting a success or an error. 802 */ 803 void 804 construct(const UnicodeString& rules, 805 UColAttributeValue collationStrength, 806 UColAttributeValue decompositionMode, 807 UErrorCode& status); 808 809 // private methods ------------------------------------------------------- 810 811 /** 812 * Creates the c struct for ucollator 813 * @param locale desired locale 814 * @param status error status 815 */ 816 void setUCollator(const Locale& locale, UErrorCode& status); 817 818 /** 819 * Creates the c struct for ucollator 820 * @param locale desired locale name 821 * @param status error status 822 */ 823 void setUCollator(const char* locale, UErrorCode& status); 824 825 /** 826 * Creates the c struct for ucollator. This used internally by StringSearch. 827 * Hence the responsibility of cleaning up the ucollator is not done by 828 * this RuleBasedCollator. The isDataOwned flag is set to FALSE. 829 * @param collator new ucollator data 830 * @param rules corresponding collation rules 831 */ 832 void setUCollator(UCollator *collator); 833 834 public: 835 /** 836 * Get UCollator data struct. Used only by StringSearch & intltest. 837 * @return UCollator data struct 838 * @internal 839 */ 840 const UCollator * getUCollator(); 841 842 protected: 843 /** 844 * Used internally by registraton to define the requested and valid locales. 845 * @param requestedLocale the requsted locale 846 * @param validLocale the valid locale 847 * @param actualLocale the actual locale 848 * @internal 849 */ 850 virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale, const Locale& actualLocale); 851 852 private: 853 854 // if not owned and not a write through alias, copy the ucollator 855 void checkOwned(void); 856 857 // utility to init rule string used by checkOwned and construct 858 void setRuleStringFromCollator(); 859 860 /** 861 * Converts C's UCollationResult to EComparisonResult 862 * @param result member of the enum UComparisonResult 863 * @return EComparisonResult equivalent of UCollationResult 864 * @deprecated ICU 2.6. We will not need it. 865 */ 866 Collator::EComparisonResult getEComparisonResult( 867 const UCollationResult &result) const; 868 869 /** 870 * Converts C's UCollationStrength to ECollationStrength 871 * @param strength member of the enum UCollationStrength 872 * @return ECollationStrength equivalent of UCollationStrength 873 */ 874 Collator::ECollationStrength getECollationStrength( 875 const UCollationStrength &strength) const; 876 877 /** 878 * Converts C++'s ECollationStrength to UCollationStrength 879 * @param strength member of the enum ECollationStrength 880 * @return UCollationStrength equivalent of ECollationStrength 881 */ 882 UCollationStrength getUCollationStrength( 883 const Collator::ECollationStrength &strength) const; 884 }; 885 886 // inline method implementation --------------------------------------------- 887 888 inline void RuleBasedCollator::setUCollator(const Locale &locale, 889 UErrorCode &status) 890 { 891 setUCollator(locale.getName(), status); 892 } 893 894 895 inline void RuleBasedCollator::setUCollator(UCollator *collator) 896 { 897 898 if (ucollator && dataIsOwned) { 899 ucol_close(ucollator); 900 } 901 ucollator = collator; 902 dataIsOwned = FALSE; 903 isWriteThroughAlias = TRUE; 904 setRuleStringFromCollator(); 905 } 906 907 inline const UCollator * RuleBasedCollator::getUCollator() 908 { 909 return ucollator; 910 } 911 912 inline Collator::EComparisonResult RuleBasedCollator::getEComparisonResult( 913 const UCollationResult &result) const 914 { 915 switch (result) 916 { 917 case UCOL_LESS : 918 return Collator::LESS; 919 case UCOL_EQUAL : 920 return Collator::EQUAL; 921 default : 922 return Collator::GREATER; 923 } 924 } 925 926 inline Collator::ECollationStrength RuleBasedCollator::getECollationStrength( 927 const UCollationStrength &strength) const 928 { 929 switch (strength) 930 { 931 case UCOL_PRIMARY : 932 return Collator::PRIMARY; 933 case UCOL_SECONDARY : 934 return Collator::SECONDARY; 935 case UCOL_TERTIARY : 936 return Collator::TERTIARY; 937 case UCOL_QUATERNARY : 938 return Collator::QUATERNARY; 939 default : 940 return Collator::IDENTICAL; 941 } 942 } 943 944 inline UCollationStrength RuleBasedCollator::getUCollationStrength( 945 const Collator::ECollationStrength &strength) const 946 { 947 switch (strength) 948 { 949 case Collator::PRIMARY : 950 return UCOL_PRIMARY; 951 case Collator::SECONDARY : 952 return UCOL_SECONDARY; 953 case Collator::TERTIARY : 954 return UCOL_TERTIARY; 955 case Collator::QUATERNARY : 956 return UCOL_QUATERNARY; 957 default : 958 return UCOL_IDENTICAL; 959 } 960 } 961 962 U_NAMESPACE_END 963 964 #endif /* #if !UCONFIG_NO_COLLATION */ 965 966 #endif 967
