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/*
******************************************************************************
* Copyright (C) 1996-2009, International Business Machines Corporation and
* others. All Rights Reserved.
******************************************************************************
*/
/**
* \file
* \brief C++ API: RuleBasedCollator class provides the simple implementation of Collator.
*/
/**
* File tblcoll.h
*
* Created by: Helena Shih
*
* Modification History:
*
* Date Name Description
* 2/5/97 aliu Added streamIn and streamOut methods. Added
* constructor which reads RuleBasedCollator object from
* a binary file. Added writeToFile method which streams
* RuleBasedCollator out to a binary file. The streamIn
* and streamOut methods use istream and ostream objects
* in binary mode.
* 2/12/97 aliu Modified to use TableCollationData sub-object to
* hold invariant data.
* 2/13/97 aliu Moved several methods into this class from Collation.
* Added a private RuleBasedCollator(Locale&) constructor,
* to be used by Collator::createDefault(). General
* clean up.
* 2/20/97 helena Added clone, operator==, operator!=, operator=, and copy
* constructor and getDynamicClassID.
* 3/5/97 aliu Modified constructFromFile() to add parameter
* specifying whether or not binary loading is to be
* attempted. This is required for dynamic rule loading.
* 05/07/97 helena Added memory allocation error detection.
* 6/17/97 helena Added IDENTICAL strength for compare, changed getRules to
* use MergeCollation::getPattern.
* 6/20/97 helena Java class name change.
* 8/18/97 helena Added internal API documentation.
* 09/03/97 helena Added createCollationKeyValues().
* 02/10/98 damiba Added compare with "length" parameter
* 08/05/98 erm Synched with 1.2 version of RuleBasedCollator.java
* 04/23/99 stephen Removed EDecompositionMode, merged with
* Normalizer::EMode
* 06/14/99 stephen Removed kResourceBundleSuffix
* 11/02/99 helena Collator performance enhancements. Eliminates the
* UnicodeString construction and special case for NO_OP.
* 11/23/99 srl More performance enhancements. Updates to NormalizerIterator
* internal state management.
* 12/15/99 aliu Update to support Thai collation. Move NormalizerIterator
* to implementation file.
* 01/29/01 synwee Modified into a C++ wrapper which calls C API
* (ucol.h)
*/
#ifndef TBLCOLL_H
#define TBLCOLL_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_COLLATION
#include "unicode/coll.h"
#include "unicode/ucol.h"
#include "unicode/sortkey.h"
#include "unicode/normlzr.h"
U_NAMESPACE_BEGIN
/**
* @stable ICU 2.0
*/
class StringSearch;
/**
* @stable ICU 2.0
*/
class CollationElementIterator;
/**
* The RuleBasedCollator class provides the simple implementation of
* Collator, using data-driven tables. The user can create a customized
* table-based collation.
* <P>
* <em>Important: </em>The ICU collation service has been reimplemented
* in order to achieve better performance and UCA compliance.
* For details, see the
* <a href="http://source.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm">
* collation design document</a>.
* <p>
* RuleBasedCollator is a thin C++ wrapper over the C implementation.
* <p>
* For more information about the collation service see
* <a href="http://icu-project.org/userguide/Collate_Intro.html">the users guide</a>.
* <p>
* Collation service provides correct sorting orders for most locales supported in ICU.
* If specific data for a locale is not available, the orders eventually falls back
* to the <a href="http://www.unicode.org/unicode/reports/tr10/">UCA sort order</a>.
* <p>
* Sort ordering may be customized by providing your own set of rules. For more on
* this subject see the <a href="http://icu-project.org/userguide/Collate_Customization.html">
* Collation customization</a> section of the users guide.
* <p>
* Note, RuleBasedCollator is not to be subclassed.
* @see Collator
* @version 2.0 11/15/2001
*/
class U_I18N_API RuleBasedCollator : public Collator
{
public:
// constructor -------------------------------------------------------------
/**
* RuleBasedCollator constructor. This takes the table rules and builds a
* collation table out of them. Please see RuleBasedCollator class
* description for more details on the collation rule syntax.
* @param rules the collation rules to build the collation table from.
* @param status reporting a success or an error.
* @see Locale
* @stable ICU 2.0
*/
RuleBasedCollator(const UnicodeString& rules, UErrorCode& status);
/**
* RuleBasedCollator constructor. This takes the table rules and builds a
* collation table out of them. Please see RuleBasedCollator class
* description for more details on the collation rule syntax.
* @param rules the collation rules to build the collation table from.
* @param collationStrength default strength for comparison
* @param status reporting a success or an error.
* @see Locale
* @stable ICU 2.0
*/
RuleBasedCollator(const UnicodeString& rules,
ECollationStrength collationStrength,
UErrorCode& status);
/**
* RuleBasedCollator constructor. This takes the table rules and builds a
* collation table out of them. Please see RuleBasedCollator class
* description for more details on the collation rule syntax.
* @param rules the collation rules to build the collation table from.
* @param decompositionMode the normalisation mode
* @param status reporting a success or an error.
* @see Locale
* @stable ICU 2.0
*/
RuleBasedCollator(const UnicodeString& rules,
UColAttributeValue decompositionMode,
UErrorCode& status);
/**
* RuleBasedCollator constructor. This takes the table rules and builds a
* collation table out of them. Please see RuleBasedCollator class
* description for more details on the collation rule syntax.
* @param rules the collation rules to build the collation table from.
* @param collationStrength default strength for comparison
* @param decompositionMode the normalisation mode
* @param status reporting a success or an error.
* @see Locale
* @stable ICU 2.0
*/
RuleBasedCollator(const UnicodeString& rules,
ECollationStrength collationStrength,
UColAttributeValue decompositionMode,
UErrorCode& status);
/**
* Copy constructor.
* @param other the RuleBasedCollator object to be copied
* @see Locale
* @stable ICU 2.0
*/
RuleBasedCollator(const RuleBasedCollator& other);
/** Opens a collator from a collator binary image created using
* cloneBinary. Binary image used in instantiation of the
* collator remains owned by the user and should stay around for
* the lifetime of the collator. The API also takes a base collator
* which usualy should be UCA.
* @param bin binary image owned by the user and required through the
* lifetime of the collator
* @param length size of the image. If negative, the API will try to
* figure out the length of the image
* @param base fallback collator, usually UCA. Base is required to be
* present through the lifetime of the collator. Currently
* it cannot be NULL.
* @param status for catching errors
* @return newly created collator
* @see cloneBinary
* @stable ICU 3.4
*/
RuleBasedCollator(const uint8_t *bin, int32_t length,
const RuleBasedCollator *base,
UErrorCode &status);
// destructor --------------------------------------------------------------
/**
* Destructor.
* @stable ICU 2.0
*/
virtual ~RuleBasedCollator();
// public methods ----------------------------------------------------------
/**
* Assignment operator.
* @param other other RuleBasedCollator object to compare with.
* @stable ICU 2.0
*/
RuleBasedCollator& operator=(const RuleBasedCollator& other);
/**
* Returns true if argument is the same as this object.
* @param other Collator object to be compared.
* @return true if arguments is the same as this object.
* @stable ICU 2.0
*/
virtual UBool operator==(const Collator& other) const;
/**
* Returns true if argument is not the same as this object.
* @param other Collator object to be compared
* @return returns true if argument is not the same as this object.
* @stable ICU 2.0
*/
virtual UBool operator!=(const Collator& other) const;
/**
* Makes a deep copy of the object.
* The caller owns the returned object.
* @return the cloned object.
* @stable ICU 2.0
*/
virtual Collator* clone(void) const;
/**
* Creates a collation element iterator for the source string. The caller of
* this method is responsible for the memory management of the return
* pointer.
* @param source the string over which the CollationElementIterator will
* iterate.
* @return the collation element iterator of the source string using this as
* the based Collator.
* @stable ICU 2.2
*/
virtual CollationElementIterator* createCollationElementIterator(
const UnicodeString& source) const;
/**
* Creates a collation element iterator for the source. The caller of this
* method is responsible for the memory management of the returned pointer.
* @param source the CharacterIterator which produces the characters over
* which the CollationElementItgerator will iterate.
* @return the collation element iterator of the source using this as the
* based Collator.
* @stable ICU 2.2
*/
virtual CollationElementIterator* createCollationElementIterator(
const CharacterIterator& source) const;
/**
* Compares a range of character data stored in two different strings based
* on the collation rules. Returns information about whether a string is
* less than, greater than or equal to another string in a language.
* This can be overriden in a subclass.
* @param source the source string.
* @param target the target string to be compared with the source string.
* @return the comparison result. GREATER if the source string is greater
* than the target string, LESS if the source is less than the
* target. Otherwise, returns EQUAL.
* @deprecated ICU 2.6 Use overload with UErrorCode&
*/
virtual EComparisonResult compare(const UnicodeString& source,
const UnicodeString& target) const;
/**
* The comparison function compares the character data stored in two
* different strings. Returns information about whether a string is less
* than, greater than or equal to another string.
* @param source the source string to be compared with.
* @param target the string that is to be compared with the source string.
* @param status possible error code
* @return Returns an enum value. UCOL_GREATER if source is greater
* than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
* than target
* @stable ICU 2.6
**/
virtual UCollationResult compare(const UnicodeString& source,
const UnicodeString& target,
UErrorCode &status) const;
/**
* Compares a range of character data stored in two different strings based
* on the collation rules up to the specified length. Returns information
* about whether a string is less than, greater than or equal to another
* string in a language. This can be overriden in a subclass.
* @param source the source string.
* @param target the target string to be compared with the source string.
* @param length compares up to the specified length
* @return the comparison result. GREATER if the source string is greater
* than the target string, LESS if the source is less than the
* target. Otherwise, returns EQUAL.
* @deprecated ICU 2.6 Use overload with UErrorCode&
*/
virtual EComparisonResult compare(const UnicodeString& source,
const UnicodeString& target,
int32_t length) const;
/**
* Does the same thing as compare but limits the comparison to a specified
* length
* @param source the source string to be compared with.
* @param target the string that is to be compared with the source string.
* @param length the length the comparison is limited to
* @param status possible error code
* @return Returns an enum value. UCOL_GREATER if source (up to the specified
* length) is greater than target; UCOL_EQUAL if source (up to specified
* length) is equal to target; UCOL_LESS if source (up to the specified
* length) is less than target.
* @stable ICU 2.6
*/
virtual UCollationResult compare(const UnicodeString& source,
const UnicodeString& target,
int32_t length,
UErrorCode &status) const;
/**
* The comparison function compares the character data stored in two
* different string arrays. Returns information about whether a string array
* is less than, greater than or equal to another string array.
* <p>Example of use:
* <pre>
* . UChar ABC[] = {0x41, 0x42, 0x43, 0}; // = "ABC"
* . UChar abc[] = {0x61, 0x62, 0x63, 0}; // = "abc"
* . UErrorCode status = U_ZERO_ERROR;
* . Collator *myCollation =
* . Collator::createInstance(Locale::US, status);
* . if (U_FAILURE(status)) return;
* . myCollation->setStrength(Collator::PRIMARY);
* . // result would be Collator::EQUAL ("abc" == "ABC")
* . // (no primary difference between "abc" and "ABC")
* . Collator::EComparisonResult result =
* . myCollation->compare(abc, 3, ABC, 3);
* . myCollation->setStrength(Collator::TERTIARY);
* . // result would be Collator::LESS ("abc" <<< "ABC")
* . // (with tertiary difference between "abc" and "ABC")
* . result = myCollation->compare(abc, 3, ABC, 3);
* </pre>
* @param source the source string array to be compared with.
* @param sourceLength the length of the source string array. If this value
* is equal to -1, the string array is null-terminated.
* @param target the string that is to be compared with the source string.
* @param targetLength the length of the target string array. If this value
* is equal to -1, the string array is null-terminated.
* @return Returns a byte value. GREATER if source is greater than target;
* EQUAL if source is equal to target; LESS if source is less than
* target
* @deprecated ICU 2.6 Use overload with UErrorCode&
*/
virtual EComparisonResult compare(const UChar* source, int32_t sourceLength,
const UChar* target, int32_t targetLength)
const;
/**
* The comparison function compares the character data stored in two
* different string arrays. Returns information about whether a string array
* is less than, greater than or equal to another string array.
* @param source the source string array to be compared with.
* @param sourceLength the length of the source string array. If this value
* is equal to -1, the string array is null-terminated.
* @param target the string that is to be compared with the source string.
* @param targetLength the length of the target string array. If this value
* is equal to -1, the string array is null-terminated.
* @param status possible error code
* @return Returns an enum value. UCOL_GREATER if source is greater
* than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
* than target
* @stable ICU 2.6
*/
virtual UCollationResult compare(const UChar* source, int32_t sourceLength,
const UChar* target, int32_t targetLength,
UErrorCode &status) const;
/**
* Compares two strings using the Collator.
* Returns whether the first one compares less than/equal to/greater than
* the second one.
* This version takes UCharIterator input.
* @param sIter the first ("source") string iterator
* @param tIter the second ("target") string iterator
* @param status ICU status
* @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER
* @draft ICU 4.2
*/
virtual UCollationResult compare(UCharIterator &sIter,
UCharIterator &tIter,
UErrorCode &status) const;
/**
* Transforms a specified region of the string into a series of characters
* that can be compared with CollationKey.compare. Use a CollationKey when
* you need to do repeated comparisions on the same string. For a single
* comparison the compare method will be faster.
* @param source the source string.
* @param key the transformed key of the source string.
* @param status the error code status.
* @return the transformed key.
* @see CollationKey
* @deprecated ICU 2.8 Use getSortKey(...) instead
*/
virtual CollationKey& getCollationKey(const UnicodeString& source,
CollationKey& key,
UErrorCode& status) const;
/**
* Transforms a specified region of the string into a series of characters
* that can be compared with CollationKey.compare. Use a CollationKey when
* you need to do repeated comparisions on the same string. For a single
* comparison the compare method will be faster.
* @param source the source string.
* @param sourceLength the length of the source string.
* @param key the transformed key of the source string.
* @param status the error code status.
* @return the transformed key.
* @see CollationKey
* @deprecated ICU 2.8 Use getSortKey(...) instead
*/
virtual CollationKey& getCollationKey(const UChar *source,
int32_t sourceLength,
CollationKey& key,
UErrorCode& status) const;
/**
* Generates the hash code for the rule-based collation object.
* @return the hash code.
* @stable ICU 2.0
*/
virtual int32_t hashCode(void) const;
/**
* Gets the locale of the Collator
* @param type can be either requested, valid or actual locale. For more
* information see the definition of ULocDataLocaleType in
* uloc.h
* @param status the error code status.
* @return locale where the collation data lives. If the collator
* was instantiated from rules, locale is empty.
* @deprecated ICU 2.8 likely to change in ICU 3.0, based on feedback
*/
virtual const Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;
/**
* Gets the table-based rules for the collation object.
* @return returns the collation rules that the table collation object was
* created from.
* @stable ICU 2.0
*/
const UnicodeString& getRules(void) const;
/**
* Gets the version information for a Collator.
* @param info the version # information, the result will be filled in
* @stable ICU 2.0
*/
virtual void getVersion(UVersionInfo info) const;
/**
* Return the maximum length of any expansion sequences that end with the
* specified comparison order.
* @param order a collation order returned by previous or next.
* @return maximum size of the expansion sequences ending with the collation
* element or 1 if collation element does not occur at the end of
* any expansion sequence
* @see CollationElementIterator#getMaxExpansion
* @stable ICU 2.0
*/
int32_t getMaxExpansion(int32_t order) const;
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
* method is to implement a simple version of RTTI, since not all C++
* compilers support genuine RTTI. Polymorphic operator==() and clone()
* methods call this method.
* @return The class ID for this object. All objects of a given class have
* the same class ID. Objects of other classes have different class
* IDs.
* @stable ICU 2.0
*/
virtual UClassID getDynamicClassID(void) const;
/**
* Returns the class ID for this class. This is useful only for comparing to
* a return value from getDynamicClassID(). For example:
* <pre>
* Base* polymorphic_pointer = createPolymorphicObject();
* if (polymorphic_pointer->getDynamicClassID() ==
* Derived::getStaticClassID()) ...
* </pre>
* @return The class ID for all objects of this class.
* @stable ICU 2.0
*/
static UClassID U_EXPORT2 getStaticClassID(void);
/**
* Returns the binary format of the class's rules. The format is that of
* .col files.
* @param length Returns the length of the data, in bytes
* @param status the error code status.
* @return memory, owned by the caller, of size 'length' bytes.
* @stable ICU 2.2
*/
uint8_t *cloneRuleData(int32_t &length, UErrorCode &status);
/** Creates a binary image of a collator. This binary image can be stored and
* later used to instantiate a collator using ucol_openBinary.
* This API supports preflighting.
* @param buffer a fill-in buffer to receive the binary image
* @param capacity capacity of the destination buffer
* @param status for catching errors
* @return size of the image
* @see ucol_openBinary
* @stable ICU 3.4
*/
int32_t cloneBinary(uint8_t *buffer, int32_t capacity, UErrorCode &status);
/**
* Returns current rules. Delta defines whether full rules are returned or
* just the tailoring.
* @param delta one of UCOL_TAILORING_ONLY, UCOL_FULL_RULES.
* @param buffer UnicodeString to store the result rules
* @stable ICU 2.2
*/
void getRules(UColRuleOption delta, UnicodeString &buffer);
/**
* Universal attribute setter
* @param attr attribute type
* @param value attribute value
* @param status to indicate whether the operation went on smoothly or there were errors
* @stable ICU 2.2
*/
virtual void setAttribute(UColAttribute attr, UColAttributeValue value,
UErrorCode &status);
/**
* Universal attribute getter.
* @param attr attribute type
* @param status to indicate whether the operation went on smoothly or there were errors
* @return attribute value
* @stable ICU 2.2
*/
virtual UColAttributeValue getAttribute(UColAttribute attr,
UErrorCode &status);
/**
* Sets the variable top to a collation element value of a string supplied.
* @param varTop one or more (if contraction) UChars to which the variable top should be set
* @param len length of variable top string. If -1 it is considered to be zero terminated.
* @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br>
* U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such a contraction<br>
* U_PRIMARY_TOO_LONG_ERROR if the primary for the variable top has more than two bytes
* @return a 32 bit value containing the value of the variable top in upper 16 bits. Lower 16 bits are undefined
* @stable ICU 2.0
*/
virtual uint32_t setVariableTop(const UChar *varTop, int32_t len, UErrorCode &status);
/**
* Sets the variable top to a collation element value of a string supplied.
* @param varTop an UnicodeString size 1 or more (if contraction) of UChars to which the variable top should be set
* @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br>
* U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such a contraction<br>
* U_PRIMARY_TOO_LONG_ERROR if the primary for the variable top has more than two bytes
* @return a 32 bit value containing the value of the variable top in upper 16 bits. Lower 16 bits are undefined
* @stable ICU 2.0
*/
virtual uint32_t setVariableTop(const UnicodeString varTop, UErrorCode &status);
/**
* Sets the variable top to a collation element value supplied. Variable top is set to the upper 16 bits.
* Lower 16 bits are ignored.
* @param varTop CE value, as returned by setVariableTop or ucol)getVariableTop
* @param status error code (not changed by function)
* @stable ICU 2.0
*/
virtual void setVariableTop(const uint32_t varTop, UErrorCode &status);
/**
* Gets the variable top value of a Collator.
* Lower 16 bits are undefined and should be ignored.
* @param status error code (not changed by function). If error code is set, the return value is undefined.
* @stable ICU 2.0
*/
virtual uint32_t getVariableTop(UErrorCode &status) const;
/**
* Get an UnicodeSet that contains all the characters and sequences tailored in
* this collator.
* @param status error code of the operation
* @return a pointer to a UnicodeSet object containing all the
* code points and sequences that may sort differently than
* in the UCA. The object must be disposed of by using delete
* @stable ICU 2.4
*/
virtual UnicodeSet *getTailoredSet(UErrorCode &status) const;
/**
* Thread safe cloning operation.
* @return pointer to the new clone, user should remove it.
* @stable ICU 2.2
*/
virtual Collator* safeClone(void);
/**
* Get the sort key as an array of bytes from an UnicodeString.
* @param source string to be processed.
* @param result buffer to store result in. If NULL, number of bytes needed
* will be returned.
* @param resultLength length of the result buffer. If if not enough the
* buffer will be filled to capacity.
* @return Number of bytes needed for storing the sort key
* @stable ICU 2.0
*/
virtual int32_t getSortKey(const UnicodeString& source, uint8_t *result,
int32_t resultLength) const;
/**
* Get the sort key as an array of bytes from an UChar buffer.
* @param source string to be processed.
* @param sourceLength length of string to be processed. If -1, the string
* is 0 terminated and length will be decided by the function.
* @param result buffer to store result in. If NULL, number of bytes needed
* will be returned.
* @param resultLength length of the result buffer. If if not enough the
* buffer will be filled to capacity.
* @return Number of bytes needed for storing the sort key
* @stable ICU 2.2
*/
virtual int32_t getSortKey(const UChar *source, int32_t sourceLength,
uint8_t *result, int32_t resultLength) const;
/**
* Determines the minimum strength that will be use in comparison or
* transformation.
* <p>E.g. with strength == SECONDARY, the tertiary difference is ignored
* <p>E.g. with strength == PRIMARY, the secondary and tertiary difference
* are ignored.
* @return the current comparison level.
* @see RuleBasedCollator#setStrength
* @deprecated ICU 2.6 Use getAttribute(UCOL_STRENGTH...) instead
*/
virtual ECollationStrength getStrength(void) const;
/**
* Sets the minimum strength to be used in comparison or transformation.
* @see RuleBasedCollator#getStrength
* @param newStrength the new comparison level.
* @deprecated ICU 2.6 Use setAttribute(UCOL_STRENGTH...) instead
*/
virtual void setStrength(ECollationStrength newStrength);
private:
// private static constants -----------------------------------------------
enum {
/* need look up in .commit() */
CHARINDEX = 0x70000000,
/* Expand index follows */
EXPANDCHARINDEX = 0x7E000000,
/* contract indexes follows */
CONTRACTCHARINDEX = 0x7F000000,
/* unmapped character values */
UNMAPPED = 0xFFFFFFFF,
/* primary strength increment */
PRIMARYORDERINCREMENT = 0x00010000,
/* secondary strength increment */
SECONDARYORDERINCREMENT = 0x00000100,
/* tertiary strength increment */
TERTIARYORDERINCREMENT = 0x00000001,
/* mask off anything but primary order */
PRIMARYORDERMASK = 0xffff0000,
/* mask off anything but secondary order */
SECONDARYORDERMASK = 0x0000ff00,
/* mask off anything but tertiary order */
TERTIARYORDERMASK = 0x000000ff,
/* mask off ignorable char order */
IGNORABLEMASK = 0x0000ffff,
/* use only the primary difference */
PRIMARYDIFFERENCEONLY = 0xffff0000,
/* use only the primary and secondary difference */
SECONDARYDIFFERENCEONLY = 0xffffff00,
/* primary order shift */
PRIMARYORDERSHIFT = 16,
/* secondary order shift */
SECONDARYORDERSHIFT = 8,
/* starting value for collation elements */
COLELEMENTSTART = 0x02020202,
/* testing mask for primary low element */
PRIMARYLOWZEROMASK = 0x00FF0000,
/* reseting value for secondaries and tertiaries */
RESETSECONDARYTERTIARY = 0x00000202,
/* reseting value for tertiaries */
RESETTERTIARY = 0x00000002,
PRIMIGNORABLE = 0x0202
};
// private data members ---------------------------------------------------
UBool dataIsOwned;
UBool isWriteThroughAlias;
/**
* c struct for collation. All initialisation for it has to be done through
* setUCollator().
*/
UCollator *ucollator;
/**
* Rule UnicodeString
*/
UnicodeString urulestring;
// friend classes --------------------------------------------------------
/**
* Used to iterate over collation elements in a character source.
*/
friend class CollationElementIterator;
/**
* Collator ONLY needs access to RuleBasedCollator(const Locale&,
* UErrorCode&)
*/
friend class Collator;
/**
* Searching over collation elements in a character source
*/
friend class StringSearch;
// private constructors --------------------------------------------------
/**
* Default constructor
*/
RuleBasedCollator();
/**
* RuleBasedCollator constructor. This constructor takes a locale. The
* only caller of this class should be Collator::createInstance(). If
* createInstance() happens to know that the requested locale's collation is
* implemented as a RuleBasedCollator, it can then call this constructor.
* OTHERWISE IT SHOULDN'T, since this constructor ALWAYS RETURNS A VALID
* COLLATION TABLE. It does this by falling back to defaults.
* @param desiredLocale locale used
* @param status error code status
*/
RuleBasedCollator(const Locale& desiredLocale, UErrorCode& status);
/**
* common constructor implementation
*
* @param rules the collation rules to build the collation table from.
* @param collationStrength default strength for comparison
* @param decompositionMode the normalisation mode
* @param status reporting a success or an error.
*/
void
construct(const UnicodeString& rules,
UColAttributeValue collationStrength,
UColAttributeValue decompositionMode,
UErrorCode& status);
// private methods -------------------------------------------------------
/**
* Creates the c struct for ucollator
* @param locale desired locale
* @param status error status
*/
void setUCollator(const Locale& locale, UErrorCode& status);
/**
* Creates the c struct for ucollator
* @param locale desired locale name
* @param status error status
*/
void setUCollator(const char* locale, UErrorCode& status);
/**
* Creates the c struct for ucollator. This used internally by StringSearch.
* Hence the responsibility of cleaning up the ucollator is not done by
* this RuleBasedCollator. The isDataOwned flag is set to FALSE.
* @param collator new ucollator data
* @param rules corresponding collation rules
*/
void setUCollator(UCollator *collator);
public:
/**
* Get UCollator data struct. Used only by StringSearch & intltest.
* @return UCollator data struct
* @internal
*/
const UCollator * getUCollator();
protected:
/**
* Used internally by registraton to define the requested and valid locales.
* @param requestedLocale the requsted locale
* @param validLocale the valid locale
* @param actualLocale the actual locale
* @internal
*/
virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale, const Locale& actualLocale);
private:
// if not owned and not a write through alias, copy the ucollator
void checkOwned(void);
// utility to init rule string used by checkOwned and construct
void setRuleStringFromCollator();
/**
* Converts C's UCollationResult to EComparisonResult
* @param result member of the enum UComparisonResult
* @return EComparisonResult equivalent of UCollationResult
* @deprecated ICU 2.6. We will not need it.
*/
Collator::EComparisonResult getEComparisonResult(
const UCollationResult &result) const;
/**
* Converts C's UCollationStrength to ECollationStrength
* @param strength member of the enum UCollationStrength
* @return ECollationStrength equivalent of UCollationStrength
*/
Collator::ECollationStrength getECollationStrength(
const UCollationStrength &strength) const;
/**
* Converts C++'s ECollationStrength to UCollationStrength
* @param strength member of the enum ECollationStrength
* @return UCollationStrength equivalent of ECollationStrength
*/
UCollationStrength getUCollationStrength(
const Collator::ECollationStrength &strength) const;
};
// inline method implementation ---------------------------------------------
inline void RuleBasedCollator::setUCollator(const Locale &locale,
UErrorCode &status)
{
setUCollator(locale.getName(), status);
}
inline void RuleBasedCollator::setUCollator(UCollator *collator)
{
if (ucollator && dataIsOwned) {
ucol_close(ucollator);
}
ucollator = collator;
dataIsOwned = FALSE;
isWriteThroughAlias = TRUE;
setRuleStringFromCollator();
}
inline const UCollator * RuleBasedCollator::getUCollator()
{
return ucollator;
}
inline Collator::EComparisonResult RuleBasedCollator::getEComparisonResult(
const UCollationResult &result) const
{
switch (result)
{
case UCOL_LESS :
return Collator::LESS;
case UCOL_EQUAL :
return Collator::EQUAL;
default :
return Collator::GREATER;
}
}
inline Collator::ECollationStrength RuleBasedCollator::getECollationStrength(
const UCollationStrength &strength) const
{
switch (strength)
{
case UCOL_PRIMARY :
return Collator::PRIMARY;
case UCOL_SECONDARY :
return Collator::SECONDARY;
case UCOL_TERTIARY :
return Collator::TERTIARY;
case UCOL_QUATERNARY :
return Collator::QUATERNARY;
default :
return Collator::IDENTICAL;
}
}
inline UCollationStrength RuleBasedCollator::getUCollationStrength(
const Collator::ECollationStrength &strength) const
{
switch (strength)
{
case Collator::PRIMARY :
return UCOL_PRIMARY;
case Collator::SECONDARY :
return UCOL_SECONDARY;
case Collator::TERTIARY :
return UCOL_TERTIARY;
case Collator::QUATERNARY :
return UCOL_QUATERNARY;
default :
return UCOL_IDENTICAL;
}
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_COLLATION */
#endif