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/*
******************************************************************************
* Copyright (C) 1996-2008, International Business Machines *
* Corporation and others. All Rights Reserved. *
******************************************************************************
*/
/**
* \file
* \brief C++ API: Collation Service.
*/
/**
* File coll.h
*
* Created by: Helena Shih
*
* Modification History:
*
* Date Name Description
* 02/5/97 aliu Modified createDefault to load collation data from
* binary files when possible. Added related methods
* createCollationFromFile, chopLocale, createPathName.
* 02/11/97 aliu Added members addToCache, findInCache, and fgCache.
* 02/12/97 aliu Modified to create objects from RuleBasedCollator cache.
* Moved cache out of Collation class.
* 02/13/97 aliu Moved several methods out of this class and into
* RuleBasedCollator, with modifications. Modified
* createDefault() to call new RuleBasedCollator(Locale&)
* constructor. General clean up and documentation.
* 02/20/97 helena Added clone, operator==, operator!=, operator=, copy
* constructor and getDynamicClassID.
* 03/25/97 helena Updated with platform independent data types.
* 05/06/97 helena Added memory allocation error detection.
* 06/20/97 helena Java class name change.
* 09/03/97 helena Added createCollationKeyValues().
* 02/10/98 damiba Added compare() with length as parameter.
* 04/23/99 stephen Removed EDecompositionMode, merged with
* Normalizer::EMode.
* 11/02/99 helena Collator performance enhancements. Eliminates the
* UnicodeString construction and special case for NO_OP.
* 11/23/99 srl More performance enhancements. Inlining of
* critical accessors.
* 05/15/00 helena Added version information API.
* 01/29/01 synwee Modified into a C++ wrapper which calls C apis
* (ucoll.h).
*/
#ifndef COLL_H
#define COLL_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_COLLATION
#include "unicode/uobject.h"
#include "unicode/ucol.h"
#include "unicode/normlzr.h"
#include "unicode/locid.h"
#include "unicode/uniset.h"
#include "unicode/umisc.h"
U_NAMESPACE_BEGIN
class StringEnumeration;
#if !UCONFIG_NO_SERVICE
/**
* @stable ICU 2.6
*/
class CollatorFactory;
#endif
/**
* @stable ICU 2.0
*/
class CollationKey;
/**
* The <code>Collator</code> class performs locale-sensitive string
* comparison.<br>
* You use this class to build searching and sorting routines for natural
* language text.<br>
* <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>
* <code>Collator</code> is an abstract base class. Subclasses implement
* specific collation strategies. One subclass,
* <code>RuleBasedCollator</code>, is currently provided and is applicable
* to a wide set of languages. Other subclasses may be created to handle more
* specialized needs.
* <p>
* Like other locale-sensitive classes, you can use the static factory method,
* <code>createInstance</code>, to obtain the appropriate
* <code>Collator</code> object for a given locale. You will only need to
* look at the subclasses of <code>Collator</code> if you need to
* understand the details of a particular collation strategy or if you need to
* modify that strategy.
* <p>
* The following example shows how to compare two strings using the
* <code>Collator</code> for the default locale.
* \htmlonly<blockquote>\endhtmlonly
* <pre>
* \code
* // Compare two strings in the default locale
* UErrorCode success = U_ZERO_ERROR;
* Collator* myCollator = Collator::createInstance(success);
* if (myCollator->compare("abc", "ABC") < 0)
* cout << "abc is less than ABC" << endl;
* else
* cout << "abc is greater than or equal to ABC" << endl;
* \endcode
* </pre>
* \htmlonly</blockquote>\endhtmlonly
* <p>
* You can set a <code>Collator</code>'s <em>strength</em> property to
* determine the level of difference considered significant in comparisons.
* Five strengths are provided: <code>PRIMARY</code>, <code>SECONDARY</code>,
* <code>TERTIARY</code>, <code>QUATERNARY</code> and <code>IDENTICAL</code>.
* The exact assignment of strengths to language features is locale dependant.
* For example, in Czech, "e" and "f" are considered primary differences,
* while "e" and "\u00EA" are secondary differences, "e" and "E" are tertiary
* differences and "e" and "e" are identical. The following shows how both case
* and accents could be ignored for US English.
* \htmlonly<blockquote>\endhtmlonly
* <pre>
* \code
* //Get the Collator for US English and set its strength to PRIMARY
* UErrorCode success = U_ZERO_ERROR;
* Collator* usCollator = Collator::createInstance(Locale::US, success);
* usCollator->setStrength(Collator::PRIMARY);
* if (usCollator->compare("abc", "ABC") == 0)
* cout << "'abc' and 'ABC' strings are equivalent with strength PRIMARY" << endl;
* \endcode
* </pre>
* \htmlonly</blockquote>\endhtmlonly
* <p>
* For comparing strings exactly once, the <code>compare</code> method
* provides the best performance. When sorting a list of strings however, it
* is generally necessary to compare each string multiple times. In this case,
* sort keys provide better performance. The <code>getSortKey</code> methods
* convert a string to a series of bytes that can be compared bitwise against
* other sort keys using <code>strcmp()</code>. Sort keys are written as
* zero-terminated byte strings. They consist of several substrings, one for
* each collation strength level, that are delimited by 0x01 bytes.
* If the string code points are appended for UCOL_IDENTICAL, then they are
* processed for correct code point order comparison and may contain 0x01
* bytes but not zero bytes.
* </p>
* <p>
* An older set of APIs returns a <code>CollationKey</code> object that wraps
* the sort key bytes instead of returning the bytes themselves.
* Its use is deprecated, but it is still available for compatibility with
* Java.
* </p>
* <p>
* <strong>Note:</strong> <code>Collator</code>s with different Locale,
* and CollationStrength settings will return different sort
* orders for the same set of strings. Locales have specific collation rules,
* and the way in which secondary and tertiary differences are taken into
* account, for example, will result in a different sorting order for same
* strings.
* </p>
* @see RuleBasedCollator
* @see CollationKey
* @see CollationElementIterator
* @see Locale
* @see Normalizer
* @version 2.0 11/15/01
*/
class U_I18N_API Collator : public UObject {
public:
// Collator public enums -----------------------------------------------
/**
* Base letter represents a primary difference. Set comparison level to
* PRIMARY to ignore secondary and tertiary differences.<br>
* Use this to set the strength of a Collator object.<br>
* Example of primary difference, "abc" &lt; "abd"
*
* Diacritical differences on the same base letter represent a secondary
* difference. Set comparison level to SECONDARY to ignore tertiary
* differences. Use this to set the strength of a Collator object.<br>
* Example of secondary difference, "&auml;" >> "a".
*
* Uppercase and lowercase versions of the same character represents a
* tertiary difference. Set comparison level to TERTIARY to include all
* comparison differences. Use this to set the strength of a Collator
* object.<br>
* Example of tertiary difference, "abc" &lt;&lt;&lt; "ABC".
*
* Two characters are considered "identical" when they have the same unicode
* spellings.<br>
* For example, "&auml;" == "&auml;".
*
* UCollationStrength is also used to determine the strength of sort keys
* generated from Collator objects.
* @stable ICU 2.0
*/
enum ECollationStrength
{
PRIMARY = 0,
SECONDARY = 1,
TERTIARY = 2,
QUATERNARY = 3,
IDENTICAL = 15
};
/**
* LESS is returned if source string is compared to be less than target
* string in the compare() method.
* EQUAL is returned if source string is compared to be equal to target
* string in the compare() method.
* GREATER is returned if source string is compared to be greater than
* target string in the compare() method.
* @see Collator#compare
* @deprecated ICU 2.6. Use C enum UCollationResult defined in ucol.h
*/
enum EComparisonResult
{
LESS = -1,
EQUAL = 0,
GREATER = 1
};
// Collator public destructor -----------------------------------------
/**
* Destructor
* @stable ICU 2.0
*/
virtual ~Collator();
// Collator public methods --------------------------------------------
/**
* Returns true if "other" is the same as "this"
* @param other Collator object to be compared
* @return true if other is the same as this.
* @stable ICU 2.0
*/
virtual UBool operator==(const Collator& other) const;
/**
* Returns true if "other" is not the same as "this".
* @param other Collator object to be compared
* @return true if other is not the same as this.
* @stable ICU 2.0
*/
virtual UBool operator!=(const Collator& other) const;
/**
* Makes a shallow copy of the current object.
* @return a copy of this object
* @stable ICU 2.0
*/
virtual Collator* clone(void) const = 0;
/**
* Creates the Collator object for the current default locale.
* The default locale is determined by Locale::getDefault.
* The UErrorCode& err parameter is used to return status information to the user.
* To check whether the construction succeeded or not, you should check the
* value of U_SUCCESS(err). If you wish more detailed information, you can
* check for informational error results which still indicate success.
* U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For
* example, 'de_CH' was requested, but nothing was found there, so 'de' was
* used. U_USING_DEFAULT_ERROR indicates that the default locale data was
* used; neither the requested locale nor any of its fall back locales
* could be found.
* The caller owns the returned object and is responsible for deleting it.
*
* @param err the error code status.
* @return the collation object of the default locale.(for example, en_US)
* @see Locale#getDefault
* @stable ICU 2.0
*/
static Collator* U_EXPORT2 createInstance(UErrorCode& err);
/**
* Gets the table-based collation object for the desired locale. The
* resource of the desired locale will be loaded by ResourceLoader.
* Locale::ENGLISH is the base collation table and all other languages are
* built on top of it with additional language-specific modifications.
* The UErrorCode& err parameter is used to return status information to the user.
* To check whether the construction succeeded or not, you should check
* the value of U_SUCCESS(err). If you wish more detailed information, you
* can check for informational error results which still indicate success.
* U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For
* example, 'de_CH' was requested, but nothing was found there, so 'de' was
* used. U_USING_DEFAULT_ERROR indicates that the default locale data was
* used; neither the requested locale nor any of its fall back locales
* could be found.
* The caller owns the returned object and is responsible for deleting it.
* @param loc The locale ID for which to open a collator.
* @param err the error code status.
* @return the created table-based collation object based on the desired
* locale.
* @see Locale
* @see ResourceLoader
* @stable ICU 2.2
*/
static Collator* U_EXPORT2 createInstance(const Locale& loc, UErrorCode& err);
#ifdef U_USE_COLLATION_OBSOLETE_2_6
/**
* Create a Collator with a specific version.
* This is the same as createInstance(loc, err) except that getVersion() of
* the returned object is guaranteed to be the same as the version
* parameter.
* This is designed to be used to open the same collator for a given
* locale even when ICU is updated.
* The same locale and version guarantees the same sort keys and
* comparison results.
* <p>
* Note: this API will be removed in a future release. Use
* <tt>createInstance(const Locale&, UErrorCode&) instead.</tt></p>
*
* @param loc The locale ID for which to open a collator.
* @param version The requested collator version.
* @param err A reference to a UErrorCode,
* must not indicate a failure before calling this function.
* @return A pointer to a Collator, or 0 if an error occurred
* or a collator with the requested version is not available.
*
* @see getVersion
* @obsolete ICU 2.6
*/
static Collator *createInstance(const Locale &loc, UVersionInfo version, UErrorCode &err);
#endif
/**
* 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.
* @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 the 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 = 0;
/**
* 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
* @return Returns a byte value. GREATER if source (up to the specified
* length) is greater than target; EQUAL if source (up to specified
* length) is equal to target; LESS if source (up to the specified
* length) is less than target.
* @deprecated ICU 2.6 use the 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 = 0;
/**
* 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.
* @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 the 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 = 0;
/**
* Transforms the string into a series of characters that can be compared
* with CollationKey::compareTo. It is not possible to restore the original
* string from the chars in the sort key. The generated sort key handles
* only a limited number of ignorable characters.
* <p>Use CollationKey::equals or CollationKey::compare to compare the
* generated sort keys.
* If the source string is null, a null collation key will be returned.
* @param source the source string to be transformed into a sort key.
* @param key the collation key to be filled in
* @param status the error code status.
* @return the collation key of the string based on the collation rules.
* @see CollationKey#compare
* @deprecated ICU 2.8 Use getSortKey(...) instead
*/
virtual CollationKey& getCollationKey(const UnicodeString& source,
CollationKey& key,
UErrorCode& status) const = 0;
/**
* Transforms the string into a series of characters that can be compared
* with CollationKey::compareTo. It is not possible to restore the original
* string from the chars in the sort key. The generated sort key handles
* only a limited number of ignorable characters.
* <p>Use CollationKey::equals or CollationKey::compare to compare the
* generated sort keys.
* <p>If the source string is null, a null collation key will be returned.
* @param source the source string to be transformed into a sort key.
* @param sourceLength length of the collation key
* @param key the collation key to be filled in
* @param status the error code status.
* @return the collation key of the string based on the collation rules.
* @see CollationKey#compare
* @deprecated ICU 2.8 Use getSortKey(...) instead
*/
virtual CollationKey& getCollationKey(const UChar*source,
int32_t sourceLength,
CollationKey& key,
UErrorCode& status) const = 0;
/**
* Generates the hash code for the collation object
* @stable ICU 2.0
*/
virtual int32_t hashCode(void) const = 0;
/**
* 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 This API is under consideration for revision
* in ICU 3.0.
*/
virtual const Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const = 0;
/**
* Convenience method for comparing two strings based on the collation rules.
* @param source the source string to be compared with.
* @param target the target string to be compared with.
* @return true if the first string is greater than the second one,
* according to the collation rules. false, otherwise.
* @see Collator#compare
* @stable ICU 2.0
*/
UBool greater(const UnicodeString& source, const UnicodeString& target)
const;
/**
* Convenience method for comparing two strings based on the collation rules.
* @param source the source string to be compared with.
* @param target the target string to be compared with.
* @return true if the first string is greater than or equal to the second
* one, according to the collation rules. false, otherwise.
* @see Collator#compare
* @stable ICU 2.0
*/
UBool greaterOrEqual(const UnicodeString& source,
const UnicodeString& target) const;
/**
* Convenience method for comparing two strings based on the collation rules.
* @param source the source string to be compared with.
* @param target the target string to be compared with.
* @return true if the strings are equal according to the collation rules.
* false, otherwise.
* @see Collator#compare
* @stable ICU 2.0
*/
UBool equals(const UnicodeString& source, const UnicodeString& target) 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 Collator#setStrength
* @deprecated ICU 2.6 Use getAttribute(UCOL_STRENGTH...) instead
*/
virtual ECollationStrength getStrength(void) const = 0;
/**
* Sets the minimum strength to be used in comparison or transformation.
* <p>Example of use:
* <pre>
* \code
* UErrorCode status = U_ZERO_ERROR;
* Collator*myCollation = Collator::createInstance(Locale::US, status);
* if (U_FAILURE(status)) return;
* myCollation->setStrength(Collator::PRIMARY);
* // result will be "abc" == "ABC"
* // tertiary differences will be ignored
* Collator::ComparisonResult result = myCollation->compare("abc", "ABC");
* \endcode
* </pre>
* @see Collator#getStrength
* @param newStrength the new comparison level.
* @deprecated ICU 2.6 Use setAttribute(UCOL_STRENGTH...) instead
*/
virtual void setStrength(ECollationStrength newStrength) = 0;
/**
* Get name of the object for the desired Locale, in the desired langauge
* @param objectLocale must be from getAvailableLocales
* @param displayLocale specifies the desired locale for output
* @param name the fill-in parameter of the return value
* @return display-able name of the object for the object locale in the
* desired language
* @stable ICU 2.0
*/
static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
const Locale& displayLocale,
UnicodeString& name);
/**
* Get name of the object for the desired Locale, in the langauge of the
* default locale.
* @param objectLocale must be from getAvailableLocales
* @param name the fill-in parameter of the return value
* @return name of the object for the desired locale in the default language
* @stable ICU 2.0
*/
static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
UnicodeString& name);
/**
* Get the set of Locales for which Collations are installed.
*
* <p>Note this does not include locales supported by registered collators.
* If collators might have been registered, use the overload of getAvailableLocales
* that returns a StringEnumeration.</p>
*
* @param count the output parameter of number of elements in the locale list
* @return the list of available locales for which collations are installed
* @stable ICU 2.0
*/
static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);
/**
* Return a StringEnumeration over the locales available at the time of the call,
* including registered locales. If a severe error occurs (such as out of memory
* condition) this will return null. If there is no locale data, an empty enumeration
* will be returned.
* @return a StringEnumeration over the locales available at the time of the call
* @stable ICU 2.6
*/
static StringEnumeration* U_EXPORT2 getAvailableLocales(void);
/**
* Create a string enumerator of all possible keywords that are relevant to
* collation. At this point, the only recognized keyword for this
* service is "collation".
* @param status input-output error code
* @return a string enumeration over locale strings. The caller is
* responsible for closing the result.
* @stable ICU 3.0
*/
static StringEnumeration* U_EXPORT2 getKeywords(UErrorCode& status);
/**
* Given a keyword, create a string enumeration of all values
* for that keyword that are currently in use.
* @param keyword a particular keyword as enumerated by
* ucol_getKeywords. If any other keyword is passed in, status is set
* to U_ILLEGAL_ARGUMENT_ERROR.
* @param status input-output error code
* @return a string enumeration over collation keyword values, or NULL
* upon error. The caller is responsible for deleting the result.
* @stable ICU 3.0
*/
static StringEnumeration* U_EXPORT2 getKeywordValues(const char *keyword, UErrorCode& status);
/**
* Return the functionally equivalent locale for the given
* requested locale, with respect to given keyword, for the
* collation service. If two locales return the same result, then
* collators instantiated for these locales will behave
* equivalently. The converse is not always true; two collators
* may in fact be equivalent, but return different results, due to
* internal details. The return result has no other meaning than
* that stated above, and implies nothing as to the relationship
* between the two locales. This is intended for use by
* applications who wish to cache collators, or otherwise reuse
* collators when possible. The functional equivalent may change
* over time. For more information, please see the <a
* href="http://icu-project.org/userguide/locale.html#services">
* Locales and Services</a> section of the ICU User Guide.
* @param keyword a particular keyword as enumerated by
* ucol_getKeywords.
* @param locale the requested locale
* @param isAvailable reference to a fillin parameter that
* indicates whether the requested locale was 'available' to the
* collation service. A locale is defined as 'available' if it
* physically exists within the collation locale data.
* @param status reference to input-output error code
* @return the functionally equivalent collation locale, or the root
* locale upon error.
* @stable ICU 3.0
*/
static Locale U_EXPORT2 getFunctionalEquivalent(const char* keyword, const Locale& locale,
UBool& isAvailable, UErrorCode& status);
#if !UCONFIG_NO_SERVICE
/**
* Register a new Collator. The collator will be adopted.
* @param toAdopt the Collator instance to be adopted
* @param locale the locale with which the collator will be associated
* @param status the in/out status code, no special meanings are assigned
* @return a registry key that can be used to unregister this collator
* @stable ICU 2.6
*/
static URegistryKey U_EXPORT2 registerInstance(Collator* toAdopt, const Locale& locale, UErrorCode& status);
/**
* Register a new CollatorFactory. The factory will be adopted.
* @param toAdopt the CollatorFactory instance to be adopted
* @param status the in/out status code, no special meanings are assigned
* @return a registry key that can be used to unregister this collator
* @stable ICU 2.6
*/
static URegistryKey U_EXPORT2 registerFactory(CollatorFactory* toAdopt, UErrorCode& status);
/**
* Unregister a previously-registered Collator or CollatorFactory
* using the key returned from the register call. Key becomes
* invalid after a successful call and should not be used again.
* The object corresponding to the key will be deleted.
* @param key the registry key returned by a previous call to registerInstance
* @param status the in/out status code, no special meanings are assigned
* @return TRUE if the collator for the key was successfully unregistered
* @stable ICU 2.6
*/
static UBool U_EXPORT2 unregister(URegistryKey key, UErrorCode& status);
#endif /* UCONFIG_NO_SERVICE */
/**
* 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 = 0;
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual method.
* 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 = 0;
/**
* 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) = 0;
/**
* 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) = 0;
/**
* 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) = 0;
/**
* 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) = 0;
/**
* 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) = 0;
/**
* 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 = 0;
/**
* 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) = 0;
/**
* Get the sort key as an array of bytes from an UnicodeString.
* Sort key byte arrays are zero-terminated and can be compared using
* strcmp().
* @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 2.2
*/
virtual int32_t getSortKey(const UnicodeString& source,
uint8_t* result,
int32_t resultLength) const = 0;
/**
* Get the sort key as an array of bytes from an UChar buffer.
* Sort key byte arrays are zero-terminated and can be compared using
* strcmp().
* @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 = 0;
/**
* Produce a bound for a given sortkey and a number of levels.
* Return value is always the number of bytes needed, regardless of
* whether the result buffer was big enough or even valid.<br>
* Resulting bounds can be used to produce a range of strings that are
* between upper and lower bounds. For example, if bounds are produced
* for a sortkey of string "smith", strings between upper and lower
* bounds with one level would include "Smith", "SMITH", "sMiTh".<br>
* There are two upper bounds that can be produced. If UCOL_BOUND_UPPER
* is produced, strings matched would be as above. However, if bound
* produced using UCOL_BOUND_UPPER_LONG is used, the above example will
* also match "Smithsonian" and similar.<br>
* For more on usage, see example in cintltst/capitst.c in procedure
* TestBounds.
* Sort keys may be compared using <TT>strcmp</TT>.
* @param source The source sortkey.
* @param sourceLength The length of source, or -1 if null-terminated.
* (If an unmodified sortkey is passed, it is always null
* terminated).
* @param boundType Type of bound required. It can be UCOL_BOUND_LOWER, which
* produces a lower inclusive bound, UCOL_BOUND_UPPER, that
* produces upper bound that matches strings of the same length
* or UCOL_BOUND_UPPER_LONG that matches strings that have the
* same starting substring as the source string.
* @param noOfLevels Number of levels required in the resulting bound (for most
* uses, the recommended value is 1). See users guide for
* explanation on number of levels a sortkey can have.
* @param result A pointer to a buffer to receive the resulting sortkey.
* @param resultLength The maximum size of result.
* @param status Used for returning error code if something went wrong. If the
* number of levels requested is higher than the number of levels
* in the source key, a warning (U_SORT_KEY_TOO_SHORT_WARNING) is
* issued.
* @return The size needed to fully store the bound.
* @see ucol_keyHashCode
* @stable ICU 2.1
*/
static int32_t U_EXPORT2 getBound(const uint8_t *source,
int32_t sourceLength,
UColBoundMode boundType,
uint32_t noOfLevels,
uint8_t *result,
int32_t resultLength,
UErrorCode &status);
protected:
// Collator protected constructors -------------------------------------
/**
* Default constructor.
* Constructor is different from the old default Collator constructor.
* The task for determing the default collation strength and normalization
* mode is left to the child class.
* @stable ICU 2.0
*/
Collator();
/**
* Constructor.
* Empty constructor, does not handle the arguments.
* This constructor is done for backward compatibility with 1.7 and 1.8.
* The task for handling the argument collation strength and normalization
* mode is left to the child class.
* @param collationStrength collation strength
* @param decompositionMode
* @deprecated ICU 2.4. Subclasses should use the default constructor
* instead and handle the strength and normalization mode themselves.
*/
Collator(UCollationStrength collationStrength,
UNormalizationMode decompositionMode);
/**
* Copy constructor.
* @param other Collator object to be copied from
* @stable ICU 2.0
*/
Collator(const Collator& other);
// Collator protected methods -----------------------------------------
/**
* Used internally by registraton to define the requested and valid locales.
* @param requestedLocale the requsted locale
* @param validLocale the valid locale
* @internal
*/
virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale, const Locale& actualLocale);
public:
#if !UCONFIG_NO_SERVICE
/**
* used only by ucol_open, not for public use
* @internal
*/
static UCollator* createUCollator(const char* loc, UErrorCode* status);
#endif
private:
/**
* Assignment operator. Private for now.
* @internal
*/
Collator& operator=(const Collator& other);
friend class CFactory;
friend class SimpleCFactory;
friend class ICUCollatorFactory;
friend class ICUCollatorService;
static Collator* makeInstance(const Locale& desiredLocale,
UErrorCode& status);
// Collator private data members ---------------------------------------
/*
synwee : removed as attributes to be handled by child class
UCollationStrength strength;
Normalizer::EMode decmp;
*/
/* This is useless information */
/* static const UVersionInfo fVersion;*/
};
#if !UCONFIG_NO_SERVICE
/**
* A factory, used with registerFactory, the creates multiple collators and provides
* display names for them. A factory supports some number of locales-- these are the
* locales for which it can create collators. The factory can be visible, in which
* case the supported locales will be enumerated by getAvailableLocales, or invisible,
* in which they are not. Invisible locales are still supported, they are just not
* listed by getAvailableLocales.
* <p>
* If standard locale display names are sufficient, Collator instances can
* be registered using registerInstance instead.</p>
* <p>
* Note: if the collators are to be used from C APIs, they must be instances
* of RuleBasedCollator.</p>
*
* @stable ICU 2.6
*/
class U_I18N_API CollatorFactory : public UObject {
public:
/**
* Destructor
* @stable ICU 3.0
*/
virtual ~CollatorFactory();
/**
* Return true if this factory is visible. Default is true.
* If not visible, the locales supported by this factory will not
* be listed by getAvailableLocales.
* @return true if the factory is visible.
* @stable ICU 2.6
*/
virtual UBool visible(void) const;
/**
* Return a collator for the provided locale. If the locale
* is not supported, return NULL.
* @param loc the locale identifying the collator to be created.
* @return a new collator if the locale is supported, otherwise NULL.
* @stable ICU 2.6
*/
virtual Collator* createCollator(const Locale& loc) = 0;
/**
* Return the name of the collator for the objectLocale, localized for the displayLocale.
* If objectLocale is not supported, or the factory is not visible, set the result string
* to bogus.
* @param objectLocale the locale identifying the collator
* @param displayLocale the locale for which the display name of the collator should be localized
* @param result an output parameter for the display name, set to bogus if not supported.
* @return the display name
* @stable ICU 2.6
*/
virtual UnicodeString& getDisplayName(const Locale& objectLocale,
const Locale& displayLocale,
UnicodeString& result);
/**
* Return an array of all the locale names directly supported by this factory.
* The number of names is returned in count. This array is owned by the factory.
* Its contents must never change.
* @param count output parameter for the number of locales supported by the factory
* @param status the in/out error code
* @return a pointer to an array of count UnicodeStrings.
* @stable ICU 2.6
*/
virtual const UnicodeString * getSupportedIDs(int32_t &count, UErrorCode& status) = 0;
};
#endif /* UCONFIG_NO_SERVICE */
// Collator inline methods -----------------------------------------------
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_COLLATION */
#endif
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