200 lines
7.0 KiB
C++
200 lines
7.0 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 1996-2001, International Business Machines Corporation and *
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* others. All Rights Reserved. *
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******************************************************************************
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*/
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/**
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* File coll.cpp
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*
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* Created by: Helena Shih
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*
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* Modification History:
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*
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* Date Name Description
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* 2/5/97 aliu Modified createDefault to load collation data from
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* binary files when possible. Added related methods
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* createCollationFromFile, chopLocale, createPathName.
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* 2/11/97 aliu Added methods addToCache, findInCache, which implement
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* a Collation cache. Modified createDefault to look in
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* cache first, and also to store newly created Collation
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* objects in the cache. Modified to not use gLocPath.
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* 2/12/97 aliu Modified to create objects from RuleBasedCollator cache.
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* Moved cache out of Collation class.
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* 2/13/97 aliu Moved several methods out of this class and into
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* RuleBasedCollator, with modifications. Modified
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* createDefault() to call new RuleBasedCollator(Locale&)
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* constructor. General clean up and documentation.
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* 2/20/97 helena Added clone, operator==, operator!=, operator=, and copy
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* constructor.
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* 05/06/97 helena Added memory allocation error detection.
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* 05/08/97 helena Added createInstance().
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* 6/20/97 helena Java class name change.
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* 04/23/99 stephen Removed EDecompositionMode, merged with
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* Normalizer::EMode
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* 11/23/9 srl Inlining of some critical functions
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* 01/29/01 synwee Modified into a C++ wrapper calling C APIs (ucol.h)
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*/
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#include "unicode/coll.h"
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#include "unicode/tblcoll.h"
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#include "cmemory.h"
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U_NAMESPACE_BEGIN
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// Collator public methods -----------------------------------------------
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Collator* Collator::createInstance(UErrorCode& success)
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{
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if (U_FAILURE(success))
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return 0;
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return createInstance(Locale::getDefault(), success);
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}
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Collator* Collator::createInstance(const Locale& desiredLocale,
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UErrorCode& status)
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{
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if (U_FAILURE(status))
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return 0;
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// A bit of explanation is required here. Although in the current
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// implementation
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// Collator::createInstance() is just turning around and calling
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// RuleBasedCollator(Locale&), this will not necessarily always be the
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// case. For example, suppose we modify this code to handle a
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// non-table-based Collator, such as that for Thai. In this case,
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// createInstance() will have to be modified to somehow determine this fact
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// (perhaps a field in the resource bundle). Then it can construct the
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// non-table-based Collator in some other way, when it sees that it needs
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// to.
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// The specific caution is this: RuleBasedCollator(Locale&) will ALWAYS
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// return a valid collation object, if the system if functioning properly.
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// The reason is that it will fall back, use the default locale, and even
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// use the built-in default collation rules. THEREFORE, createInstance()
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// should in general ONLY CALL RuleBasedCollator(Locale&) IF IT KNOWS IN
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// ADVANCE that the given locale's collation is properly implemented as a
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// RuleBasedCollator.
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// Currently, we don't do this...we always return a RuleBasedCollator,
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// whether it is strictly correct to do so or not, without checking, because
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// we currently have no way of checking.
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RuleBasedCollator* collation = new RuleBasedCollator(desiredLocale,
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status);
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if (U_FAILURE(status))
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{
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delete collation;
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collation = NULL;
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}
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return collation;
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}
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Collator *
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Collator::createInstance(const Locale &loc,
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UVersionInfo version,
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UErrorCode &status) {
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Collator *collator;
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UVersionInfo info;
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collator=new RuleBasedCollator(loc, status);
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if(U_SUCCESS(status)) {
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collator->getVersion(info);
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if(0!=uprv_memcmp(version, info, sizeof(UVersionInfo))) {
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delete collator;
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status=U_MISSING_RESOURCE_ERROR;
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return NULL;
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}
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}
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return collator;
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}
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UBool Collator::equals(const UnicodeString& source,
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const UnicodeString& target) const
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{
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return (compare(source, target) == EQUAL);
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}
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UBool Collator::greaterOrEqual(const UnicodeString& source,
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const UnicodeString& target) const
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{
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return (compare(source, target) != LESS);
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}
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UBool Collator::greater(const UnicodeString& source,
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const UnicodeString& target) const
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{
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return (compare(source, target) == GREATER);
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}
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const Locale* Collator::getAvailableLocales(int32_t& count)
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{
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return Locale::getAvailableLocales(count);
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}
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UnicodeString& Collator::getDisplayName(const Locale& objectLocale,
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const Locale& displayLocale,
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UnicodeString& name)
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{
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// synwee : in a dilemma whether to change to UCollator. Since
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// UCollator is basically using the below operation.
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// Change means more mantainability where else no change means faster speed.
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return objectLocale.getDisplayName(displayLocale, name);
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}
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UnicodeString& Collator::getDisplayName(const Locale& objectLocale,
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UnicodeString& name)
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{
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// synwee : in a dilemma whether to change to UCollator. Since
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// UCollator is basically using the below operation.
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// Change means more mantainability where else no change means faster speed.
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return objectLocale.getDisplayName(Locale::getDefault(), name);
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}
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void Collator::getVersion(UVersionInfo versionInfo) const
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{
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if (versionInfo!=NULL)
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uprv_memcpy(versionInfo, fVersion, U_MAX_VERSION_LENGTH);
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}
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// UCollator protected constructor destructor ----------------------------
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/**
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* Default constructor.
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* Constructor is different from the old default Collator constructor.
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* The task for determing the default collation strength and normalization mode
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* is left to the child class.
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*/
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Collator::Collator()
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{
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}
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/**
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* Constructor.
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* Empty constructor, does not handle the arguments.
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* This constructor is done for backward compatibility with 1.7 and 1.8.
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* The task for handling the argument collation strength and normalization
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* mode is left to the child class.
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* @param collationStrength collation strength
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* @param decompositionMode
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*/
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Collator::Collator(UCollationStrength /* collationStrength */,
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UNormalizationMode /* decompositionMode */)
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{
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}
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Collator::~Collator()
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{
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}
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Collator::Collator(const Collator& /* other */)
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{
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}
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// UCollator private data members ----------------------------------------
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const UVersionInfo Collator::fVersion = {1, 1, 0, 0};
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U_NAMESPACE_END
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/* eof */
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