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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+* Copyright (C) 1996-2016, 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
+* (ucol.h).
+* 2012-2014 markus Rewritten in C++ again.
+*/
+
+#ifndef COLL_H
+#define COLL_H
+
+#include "unicode/utypes.h"
+
+#if U_SHOW_CPLUSPLUS_API
+
+#if !UCONFIG_NO_COLLATION
+
+#include "unicode/uobject.h"
+#include "unicode/ucol.h"
+#include "unicode/unorm.h"
+#include "unicode/locid.h"
+#include "unicode/uniset.h"
+#include "unicode/umisc.h"
+#include "unicode/uiter.h"
+#include "unicode/stringpiece.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.
+* <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> attribute 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 dependent.
+* 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::getUS(), 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
+*
+* 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.
+*
+* Another set of APIs returns a <code>CollationKey</code> object that wraps
+* the sort key bytes instead of returning the bytes themselves.
+* </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 Normalizer2
+* @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 = UCOL_PRIMARY, // 0
+ SECONDARY = UCOL_SECONDARY, // 1
+ TERTIARY = UCOL_TERTIARY, // 2
+ QUATERNARY = UCOL_QUATERNARY, // 3
+ IDENTICAL = UCOL_IDENTICAL // 15
+ };
+
+
+ // Cannot use #ifndef U_HIDE_DEPRECATED_API for the following, it is
+ // used by virtual methods that cannot have that conditional.
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * 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 = UCOL_LESS, // -1
+ EQUAL = UCOL_EQUAL, // 0
+ GREATER = UCOL_GREATER // 1
+ };
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ // Collator public destructor -----------------------------------------
+
+ /**
+ * Destructor
+ * @stable ICU 2.0
+ */
+ virtual ~Collator();
+
+ // Collator public methods --------------------------------------------
+
+ /**
+ * Returns true if "other" is the same as "this".
+ *
+ * The base class implementation returns true if "other" has the same type/class as "this":
+ * `typeid(*this) == typeid(other)`.
+ *
+ * Subclass implementations should do something like the following:
+ *
+ * if (this == &other) { return true; }
+ * if (!Collator::operator==(other)) { return false; } // not the same class
+ *
+ * const MyCollator &o = (const MyCollator&)other;
+ * (compare this vs. o's subclass fields)
+ *
+ * @param other Collator object to be compared
+ * @return true if other is the same as this.
+ * @stable ICU 2.0
+ */
+ virtual bool operator==(const Collator& other) const;
+
+ /**
+ * Returns true if "other" is not the same as "this".
+ * Calls ! operator==(const Collator&) const which works for all subclasses.
+ * @param other Collator object to be compared
+ * @return true if other is not the same as this.
+ * @stable ICU 2.0
+ */
+ virtual bool operator!=(const Collator& other) const;
+
+ /**
+ * Makes a copy of this object.
+ * @return a copy of this object, owned by the caller
+ * @stable ICU 2.0
+ */
+ virtual Collator* clone() 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 collation object for the desired locale. The
+ * resource of the desired locale will be loaded.
+ *
+ * Locale::getRoot() is the base collation table and all other languages are
+ * built on top of it with additional language-specific modifications.
+ *
+ * For some languages, multiple collation types are available;
+ * for example, "de@collation=phonebook".
+ * Starting with ICU 54, collation attributes can be specified via locale keywords as well,
+ * in the old locale extension syntax ("el@colCaseFirst=upper")
+ * or in language tag syntax ("el-u-kf-upper").
+ * See <a href="https://unicode-org.github.io/icu/userguide/collation/api">User Guide: Collation API</a>.
+ *
+ * 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);
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * 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;
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ /**
+ * 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;
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * 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;
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ /**
+ * 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;
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * 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>
+ * . char16_t ABC[] = {0x41, 0x42, 0x43, 0}; // = "ABC"
+ * . char16_t abc[] = {0x61, 0x62, 0x63, 0}; // = "abc"
+ * . UErrorCode status = U_ZERO_ERROR;
+ * . Collator *myCollation =
+ * . Collator::createInstance(Locale::getUS(), 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" &lt;&lt;&lt; "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 the overload with UErrorCode &
+ */
+ virtual EComparisonResult compare(const char16_t* source, int32_t sourceLength,
+ const char16_t* target, int32_t targetLength)
+ const;
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ /**
+ * 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 char16_t* source, int32_t sourceLength,
+ const char16_t* target, int32_t targetLength,
+ UErrorCode &status) const = 0;
+
+ /**
+ * 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
+ * @stable ICU 4.2
+ */
+ virtual UCollationResult compare(UCharIterator &sIter,
+ UCharIterator &tIter,
+ UErrorCode &status) const;
+
+ /**
+ * Compares two UTF-8 strings using the Collator.
+ * Returns whether the first one compares less than/equal to/greater than
+ * the second one.
+ * This version takes UTF-8 input.
+ * Note that a StringPiece can be implicitly constructed
+ * from a std::string or a NUL-terminated const char * string.
+ * @param source the first UTF-8 string
+ * @param target the second UTF-8 string
+ * @param status ICU status
+ * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER
+ * @stable ICU 4.2
+ */
+ virtual UCollationResult compareUTF8(const StringPiece &source,
+ const StringPiece &target,
+ UErrorCode &status) const;
+
+ /**
+ * 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.
+ * <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.
+ *
+ * Note that sort keys are often less efficient than simply doing comparison.
+ * For more details, see the ICU User Guide.
+ *
+ * @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
+ * @stable ICU 2.0
+ */
+ 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.
+ * <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.
+ *
+ * Note that sort keys are often less efficient than simply doing comparison.
+ * For more details, see the ICU User Guide.
+ *
+ * @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
+ * @stable ICU 2.0
+ */
+ virtual CollationKey& getCollationKey(const char16_t*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;
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * 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 Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const = 0;
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ /**
+ * 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;
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * Determines the minimum strength that will be used 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;
+
+ /**
+ * 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::getUS(), 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);
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ /**
+ * Retrieves the reordering codes for this collator.
+ * @param dest The array to fill with the script ordering.
+ * @param destCapacity The length of dest. If it is 0, then dest may be nullptr and the function
+ * will only return the length of the result without writing any codes (pre-flighting).
+ * @param status A reference to an error code value, which must not indicate
+ * a failure before the function call.
+ * @return The length of the script ordering array.
+ * @see ucol_setReorderCodes
+ * @see Collator#getEquivalentReorderCodes
+ * @see Collator#setReorderCodes
+ * @see UScriptCode
+ * @see UColReorderCode
+ * @stable ICU 4.8
+ */
+ virtual int32_t getReorderCodes(int32_t *dest,
+ int32_t destCapacity,
+ UErrorCode& status) const;
+
+ /**
+ * Sets the ordering of scripts for this collator.
+ *
+ * <p>The reordering codes are a combination of script codes and reorder codes.
+ * @param reorderCodes An array of script codes in the new order. This can be nullptr if the
+ * length is also set to 0. An empty array will clear any reordering codes on the collator.
+ * @param reorderCodesLength The length of reorderCodes.
+ * @param status error code
+ * @see ucol_setReorderCodes
+ * @see Collator#getReorderCodes
+ * @see Collator#getEquivalentReorderCodes
+ * @see UScriptCode
+ * @see UColReorderCode
+ * @stable ICU 4.8
+ */
+ virtual void setReorderCodes(const int32_t* reorderCodes,
+ int32_t reorderCodesLength,
+ UErrorCode& status) ;
+
+ /**
+ * Retrieves the reorder codes that are grouped with the given reorder code. Some reorder
+ * codes will be grouped and must reorder together.
+ * Beginning with ICU 55, scripts only reorder together if they are primary-equal,
+ * for example Hiragana and Katakana.
+ *
+ * @param reorderCode The reorder code to determine equivalence for.
+ * @param dest The array to fill with the script equivalence reordering codes.
+ * @param destCapacity The length of dest. If it is 0, then dest may be nullptr and the
+ * function will only return the length of the result without writing any codes (pre-flighting).
+ * @param status A reference to an error code value, which must not indicate
+ * a failure before the function call.
+ * @return The length of the of the reordering code equivalence array.
+ * @see ucol_setReorderCodes
+ * @see Collator#getReorderCodes
+ * @see Collator#setReorderCodes
+ * @see UScriptCode
+ * @see UColReorderCode
+ * @stable ICU 4.8
+ */
+ static int32_t U_EXPORT2 getEquivalentReorderCodes(int32_t reorderCode,
+ int32_t* dest,
+ int32_t destCapacity,
+ UErrorCode& status);
+
+ /**
+ * Get name of the object for the desired Locale, in the desired language
+ * @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 language 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 nullptr
+ * upon error. The caller is responsible for deleting the result.
+ * @stable ICU 3.0
+ */
+ static StringEnumeration* U_EXPORT2 getKeywordValues(const char *keyword, UErrorCode& status);
+
+ /**
+ * Given a key and a locale, returns an array of string values in a preferred
+ * order that would make a difference. These are all and only those values where
+ * the open (creation) of the service with the locale formed from the input locale
+ * plus input keyword and that value has different behavior than creation with the
+ * input locale alone.
+ * @param keyword one of the keys supported by this service. For now, only
+ * "collation" is supported.
+ * @param locale the locale
+ * @param commonlyUsed if set to true it will return only commonly used values
+ * with the given locale in preferred order. Otherwise,
+ * it will return all the available values for the locale.
+ * @param status ICU status
+ * @return a string enumeration over keyword values for the given key and the locale.
+ * @stable ICU 4.2
+ */
+ static StringEnumeration* U_EXPORT2 getKeywordValuesForLocale(const char* keyword, const Locale& locale,
+ UBool commonlyUsed, 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="https://unicode-org.github.io/icu/userguide/locale#locales-and-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.
+ * Because ICU may choose to cache collators internally, this must be
+ * called at application startup, prior to any calls to
+ * Collator::createInstance to avoid undefined behavior.
+ * @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.
+ * Because ICU may choose to cache collators internally, this must be
+ * called at application startup, prior to any calls to
+ * Collator::createInstance to avoid undefined behavior.
+ * @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.
+ * Because ICU may choose to cache collators internally, this should
+ * be called during application shutdown, after all calls to
+ * Collator::createInstance to avoid undefined behavior.
+ * @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 override = 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) const = 0;
+
+ /**
+ * Sets the variable top to the top of the specified reordering group.
+ * The variable top determines the highest-sorting character
+ * which is affected by UCOL_ALTERNATE_HANDLING.
+ * If that attribute is set to UCOL_NON_IGNORABLE, then the variable top has no effect.
+ *
+ * The base class implementation sets U_UNSUPPORTED_ERROR.
+ * @param group one of UCOL_REORDER_CODE_SPACE, UCOL_REORDER_CODE_PUNCTUATION,
+ * UCOL_REORDER_CODE_SYMBOL, UCOL_REORDER_CODE_CURRENCY;
+ * or UCOL_REORDER_CODE_DEFAULT to restore the default max variable group
+ * @param errorCode Standard ICU error code. Its input value must
+ * pass the U_SUCCESS() test, or else the function returns
+ * immediately. Check for U_FAILURE() on output or use with
+ * function chaining. (See User Guide for details.)
+ * @return *this
+ * @see getMaxVariable
+ * @stable ICU 53
+ */
+ virtual Collator &setMaxVariable(UColReorderCode group, UErrorCode &errorCode);
+
+ /**
+ * Returns the maximum reordering group whose characters are affected by UCOL_ALTERNATE_HANDLING.
+ *
+ * The base class implementation returns UCOL_REORDER_CODE_PUNCTUATION.
+ * @return the maximum variable reordering group.
+ * @see setMaxVariable
+ * @stable ICU 53
+ */
+ virtual UColReorderCode getMaxVariable() const;
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * Sets the variable top to the primary weight of the specified string.
+ *
+ * Beginning with ICU 53, the variable top is pinned to
+ * the top of one of the supported reordering groups,
+ * and it must not be beyond the last of those groups.
+ * See setMaxVariable().
+ * @param varTop one or more (if contraction) char16_ts 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 contraction<br>
+ * U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond
+ * the last reordering group supported by setMaxVariable()
+ * @return variable top primary weight
+ * @deprecated ICU 53 Call setMaxVariable() instead.
+ */
+ virtual uint32_t setVariableTop(const char16_t *varTop, int32_t len, UErrorCode &status) = 0;
+
+ /**
+ * Sets the variable top to the primary weight of the specified string.
+ *
+ * Beginning with ICU 53, the variable top is pinned to
+ * the top of one of the supported reordering groups,
+ * and it must not be beyond the last of those groups.
+ * See setMaxVariable().
+ * @param varTop a UnicodeString size 1 or more (if contraction) of char16_ts 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 contraction<br>
+ * U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond
+ * the last reordering group supported by setMaxVariable()
+ * @return variable top primary weight
+ * @deprecated ICU 53 Call setMaxVariable() instead.
+ */
+ virtual uint32_t setVariableTop(const UnicodeString &varTop, UErrorCode &status) = 0;
+
+ /**
+ * Sets the variable top to the specified primary weight.
+ *
+ * Beginning with ICU 53, the variable top is pinned to
+ * the top of one of the supported reordering groups,
+ * and it must not be beyond the last of those groups.
+ * See setMaxVariable().
+ * @param varTop primary weight, as returned by setVariableTop or ucol_getVariableTop
+ * @param status error code
+ * @deprecated ICU 53 Call setMaxVariable() instead.
+ */
+ virtual void setVariableTop(uint32_t varTop, UErrorCode &status) = 0;
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ /**
+ * Gets the variable top value of a Collator.
+ * @param status error code (not changed by function). If error code is set, the return value is undefined.
+ * @return the variable top primary weight
+ * @see getMaxVariable
+ * @stable ICU 2.0
+ */
+ virtual uint32_t getVariableTop(UErrorCode &status) const = 0;
+
+ /**
+ * Get a 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 root collator. The object must be disposed of by using delete
+ * @stable ICU 2.4
+ */
+ virtual UnicodeSet *getTailoredSet(UErrorCode &status) const;
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+ /**
+ * Same as clone().
+ * The base class implementation simply calls clone().
+ * @return a copy of this object, owned by the caller
+ * @see clone()
+ * @deprecated ICU 50 no need to have two methods for cloning
+ */
+ virtual Collator* safeClone() const;
+#endif // U_FORCE_HIDE_DEPRECATED_API
+
+ /**
+ * Get the sort key as an array of bytes from a UnicodeString.
+ * Sort key byte arrays are zero-terminated and can be compared using
+ * strcmp().
+ *
+ * Note that sort keys are often less efficient than simply doing comparison.
+ * For more details, see the ICU User Guide.
+ *
+ * @param source string to be processed.
+ * @param result buffer to store result in. If nullptr, 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 a char16_t buffer.
+ * Sort key byte arrays are zero-terminated and can be compared using
+ * strcmp().
+ *
+ * Note that sort keys are often less efficient than simply doing comparison.
+ * For more details, see the ICU User Guide.
+ *
+ * @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 nullptr, 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 char16_t*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 determining the default collation strength and normalization
+ * mode is left to the child class.
+ * @stable ICU 2.0
+ */
+ Collator();
+
+#ifndef U_HIDE_DEPRECATED_API
+ /**
+ * 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);
+#endif /* U_HIDE_DEPRECATED_API */
+
+ /**
+ * Copy constructor.
+ * @param other Collator object to be copied from
+ * @stable ICU 2.0
+ */
+ Collator(const Collator& other);
+
+public:
+ /**
+ * Used internally by registration to define the requested and valid locales.
+ * @param requestedLocale the requested locale
+ * @param validLocale the valid locale
+ * @param actualLocale the actual locale
+ * @internal
+ */
+ virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale, const Locale& actualLocale);
+
+ /** Get the short definition string for a collator. This internal API harvests the collator's
+ * locale and the attribute set and produces a string that can be used for opening
+ * a collator with the same attributes using the ucol_openFromShortString API.
+ * This string will be normalized.
+ * The structure and the syntax of the string is defined in the "Naming collators"
+ * section of the users guide:
+ * https://unicode-org.github.io/icu/userguide/collation/concepts#collator-naming-scheme
+ * This function supports preflighting.
+ *
+ * This is internal, and intended to be used with delegate converters.
+ *
+ * @param locale a locale that will appear as a collators locale in the resulting
+ * short string definition. If nullptr, the locale will be harvested
+ * from the collator.
+ * @param buffer space to hold the resulting string
+ * @param capacity capacity of the buffer
+ * @param status for returning errors. All the preflighting errors are featured
+ * @return length of the resulting string
+ * @see ucol_openFromShortString
+ * @see ucol_normalizeShortDefinitionString
+ * @see ucol_getShortDefinitionString
+ * @internal
+ */
+ virtual int32_t internalGetShortDefinitionString(const char *locale,
+ char *buffer,
+ int32_t capacity,
+ UErrorCode &status) const;
+
+ /**
+ * Implements ucol_strcollUTF8().
+ * @internal
+ */
+ virtual UCollationResult internalCompareUTF8(
+ const char *left, int32_t leftLength,
+ const char *right, int32_t rightLength,
+ UErrorCode &errorCode) const;
+
+ /**
+ * Implements ucol_nextSortKeyPart().
+ * @internal
+ */
+ virtual int32_t
+ internalNextSortKeyPart(
+ UCharIterator *iter, uint32_t state[2],
+ uint8_t *dest, int32_t count, UErrorCode &errorCode) const;
+
+#ifndef U_HIDE_INTERNAL_API
+ /** @internal */
+ static inline Collator *fromUCollator(UCollator *uc) {
+ return reinterpret_cast<Collator *>(uc);
+ }
+ /** @internal */
+ static inline const Collator *fromUCollator(const UCollator *uc) {
+ return reinterpret_cast<const Collator *>(uc);
+ }
+ /** @internal */
+ inline UCollator *toUCollator() {
+ return reinterpret_cast<UCollator *>(this);
+ }
+ /** @internal */
+ inline const UCollator *toUCollator() const {
+ return reinterpret_cast<const UCollator *>(this);
+ }
+#endif // U_HIDE_INTERNAL_API
+
+private:
+ /**
+ * Assignment operator. Private for now.
+ */
+ Collator& operator=(const Collator& other) = delete;
+
+ friend class CFactory;
+ friend class SimpleCFactory;
+ friend class ICUCollatorFactory;
+ friend class ICUCollatorService;
+ static Collator* makeInstance(const Locale& desiredLocale,
+ UErrorCode& status);
+};
+
+#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 nullptr.
+ * @param loc the locale identifying the collator to be created.
+ * @return a new collator if the locale is supported, otherwise nullptr.
+ * @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 /* U_SHOW_CPLUSPLUS_API */
+
+#endif