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Diffstat (limited to 'thirdparty/icu4c/common/servloc.h')
| -rw-r--r-- | thirdparty/icu4c/common/servloc.h | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/thirdparty/icu4c/common/servloc.h b/thirdparty/icu4c/common/servloc.h new file mode 100644 index 0000000000..ccf6433379 --- /dev/null +++ b/thirdparty/icu4c/common/servloc.h @@ -0,0 +1,551 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/** + ******************************************************************************* + * Copyright (C) 2001-2011, International Business Machines Corporation and * + * others. All Rights Reserved. * + ******************************************************************************* + * + ******************************************************************************* + */ +#ifndef ICULSERV_H +#define ICULSERV_H + +#include "unicode/utypes.h" + +#if UCONFIG_NO_SERVICE + +U_NAMESPACE_BEGIN + +/* + * Allow the declaration of APIs with pointers to ICUService + * even when service is removed from the build. + */ +class ICULocaleService; + +U_NAMESPACE_END + +#else + +#include "unicode/unistr.h" +#include "unicode/locid.h" +#include "unicode/strenum.h" + +#include "hash.h" +#include "uvector.h" + +#include "serv.h" +#include "locutil.h" + +U_NAMESPACE_BEGIN + +class ICULocaleService; + +class LocaleKey; +class LocaleKeyFactory; +class SimpleLocaleKeyFactory; +class ServiceListener; + +/* + ****************************************************************** + */ + +/** + * A subclass of Key that implements a locale fallback mechanism. + * The first locale to search for is the locale provided by the + * client, and the fallback locale to search for is the current + * default locale. If a prefix is present, the currentDescriptor + * includes it before the locale proper, separated by "/". This + * is the default key instantiated by ICULocaleService.</p> + * + * <p>Canonicalization adjusts the locale string so that the + * section before the first understore is in lower case, and the rest + * is in upper case, with no trailing underscores.</p> + */ + +class U_COMMON_API LocaleKey : public ICUServiceKey { + private: + int32_t _kind; + UnicodeString _primaryID; + UnicodeString _fallbackID; + UnicodeString _currentID; + + public: + enum { + KIND_ANY = -1 + }; + + /** + * Create a LocaleKey with canonical primary and fallback IDs. + */ + static LocaleKey* createWithCanonicalFallback(const UnicodeString* primaryID, + const UnicodeString* canonicalFallbackID, + UErrorCode& status); + + /** + * Create a LocaleKey with canonical primary and fallback IDs. + */ + static LocaleKey* createWithCanonicalFallback(const UnicodeString* primaryID, + const UnicodeString* canonicalFallbackID, + int32_t kind, + UErrorCode& status); + + protected: + /** + * PrimaryID is the user's requested locale string, + * canonicalPrimaryID is this string in canonical form, + * fallbackID is the current default locale's string in + * canonical form. + */ + LocaleKey(const UnicodeString& primaryID, + const UnicodeString& canonicalPrimaryID, + const UnicodeString* canonicalFallbackID, + int32_t kind); + + public: + /** + * Append the prefix associated with the kind, or nothing if the kind is KIND_ANY. + */ + virtual UnicodeString& prefix(UnicodeString& result) const; + + /** + * Return the kind code associated with this key. + */ + virtual int32_t kind() const; + + /** + * Return the canonicalID. + */ + virtual UnicodeString& canonicalID(UnicodeString& result) const; + + /** + * Return the currentID. + */ + virtual UnicodeString& currentID(UnicodeString& result) const; + + /** + * Return the (canonical) current descriptor, or null if no current id. + */ + virtual UnicodeString& currentDescriptor(UnicodeString& result) const; + + /** + * Convenience method to return the locale corresponding to the (canonical) original ID. + */ + virtual Locale& canonicalLocale(Locale& result) const; + + /** + * Convenience method to return the locale corresponding to the (canonical) current ID. + */ + virtual Locale& currentLocale(Locale& result) const; + + /** + * If the key has a fallback, modify the key and return true, + * otherwise return false.</p> + * + * <p>First falls back through the primary ID, then through + * the fallbackID. The final fallback is the empty string, + * unless the primary id was the empty string, in which case + * there is no fallback. + */ + virtual UBool fallback(); + + /** + * Return true if a key created from id matches, or would eventually + * fallback to match, the canonical ID of this key. + */ + virtual UBool isFallbackOf(const UnicodeString& id) const; + + public: + /** + * UObject boilerplate. + */ + static UClassID U_EXPORT2 getStaticClassID(); + + virtual UClassID getDynamicClassID() const; + + /** + * Destructor. + */ + virtual ~LocaleKey(); + +#ifdef SERVICE_DEBUG + public: + virtual UnicodeString& debug(UnicodeString& result) const; + virtual UnicodeString& debugClass(UnicodeString& result) const; +#endif + +}; + +/* + ****************************************************************** + */ + +/** + * A subclass of ICUServiceFactory that uses LocaleKeys, and is able to + * 'cover' more specific locales with more general locales that it + * supports. + * + * <p>Coverage may be either of the values VISIBLE or INVISIBLE. + * + * <p>'Visible' indicates that the specific locale(s) supported by + * the factory are registered in getSupportedIDs, 'Invisible' + * indicates that they are not. + * + * <p>Localization of visible ids is handled + * by the handling factory, regardless of kind. + */ +class U_COMMON_API LocaleKeyFactory : public ICUServiceFactory { +protected: + const UnicodeString _name; + const int32_t _coverage; + +public: + enum { + /** + * Coverage value indicating that the factory makes + * its locales visible, and does not cover more specific + * locales. + */ + VISIBLE = 0, + + /** + * Coverage value indicating that the factory does not make + * its locales visible, and does not cover more specific + * locales. + */ + INVISIBLE = 1 + }; + + /** + * Destructor. + */ + virtual ~LocaleKeyFactory(); + +protected: + /** + * Constructor used by subclasses. + */ + LocaleKeyFactory(int32_t coverage); + + /** + * Constructor used by subclasses. + */ + LocaleKeyFactory(int32_t coverage, const UnicodeString& name); + + /** + * Implement superclass abstract method. This checks the currentID of + * the key against the supported IDs, and passes the canonicalLocale and + * kind off to handleCreate (which subclasses must implement). + */ +public: + virtual UObject* create(const ICUServiceKey& key, const ICUService* service, UErrorCode& status) const; + +protected: + virtual UBool handlesKey(const ICUServiceKey& key, UErrorCode& status) const; + +public: + /** + * Override of superclass method. This adjusts the result based + * on the coverage rule for this factory. + */ + virtual void updateVisibleIDs(Hashtable& result, UErrorCode& status) const; + + /** + * Return a localized name for the locale represented by id. + */ + virtual UnicodeString& getDisplayName(const UnicodeString& id, const Locale& locale, UnicodeString& result) const; + +protected: + /** + * Utility method used by create(ICUServiceKey, ICUService). Subclasses can implement + * this instead of create. The default returns NULL. + */ + virtual UObject* handleCreate(const Locale& loc, int32_t kind, const ICUService* service, UErrorCode& status) const; + + /** + * Return true if this id is one the factory supports (visible or + * otherwise). + */ + // virtual UBool isSupportedID(const UnicodeString& id, UErrorCode& status) const; + + /** + * Return the set of ids that this factory supports (visible or + * otherwise). This can be called often and might need to be + * cached if it is expensive to create. + */ + virtual const Hashtable* getSupportedIDs(UErrorCode& status) const; + +public: + /** + * UObject boilerplate. + */ + static UClassID U_EXPORT2 getStaticClassID(); + + virtual UClassID getDynamicClassID() const; + +#ifdef SERVICE_DEBUG + public: + virtual UnicodeString& debug(UnicodeString& result) const; + virtual UnicodeString& debugClass(UnicodeString& result) const; +#endif + +}; + +/* + ****************************************************************** + */ + +/** + * A LocaleKeyFactory that just returns a single object for a kind/locale. + */ + +class U_COMMON_API SimpleLocaleKeyFactory : public LocaleKeyFactory { + private: + UObject* _obj; + UnicodeString _id; + const int32_t _kind; + + public: + SimpleLocaleKeyFactory(UObject* objToAdopt, + const UnicodeString& locale, + int32_t kind, + int32_t coverage); + + SimpleLocaleKeyFactory(UObject* objToAdopt, + const Locale& locale, + int32_t kind, + int32_t coverage); + + /** + * Destructor. + */ + virtual ~SimpleLocaleKeyFactory(); + + /** + * Override of superclass method. Returns the service object if kind/locale match. Service is not used. + */ + virtual UObject* create(const ICUServiceKey& key, const ICUService* service, UErrorCode& status) const; + + /** + * Override of superclass method. This adjusts the result based + * on the coverage rule for this factory. + */ + virtual void updateVisibleIDs(Hashtable& result, UErrorCode& status) const; + + protected: + /** + * Return true if this id is equal to the locale name. + */ + //virtual UBool isSupportedID(const UnicodeString& id, UErrorCode& status) const; + + +public: + /** + * UObject boilerplate. + */ + static UClassID U_EXPORT2 getStaticClassID(); + + virtual UClassID getDynamicClassID() const; + +#ifdef SERVICE_DEBUG + public: + virtual UnicodeString& debug(UnicodeString& result) const; + virtual UnicodeString& debugClass(UnicodeString& result) const; +#endif + +}; + +/* + ****************************************************************** + */ + +/** + * A LocaleKeyFactory that creates a service based on the ICU locale data. + * This is a base class for most ICU factories. Subclasses instantiate it + * with a constructor that takes a bundle name, which determines the supported + * IDs. Subclasses then override handleCreate to create the actual service + * object. The default implementation returns a resource bundle. + */ +class U_COMMON_API ICUResourceBundleFactory : public LocaleKeyFactory +{ + protected: + UnicodeString _bundleName; + + public: + /** + * Convenience constructor that uses the main ICU bundle name. + */ + ICUResourceBundleFactory(); + + /** + * A service factory based on ICU resource data in resources with + * the given name. This should be a 'path' that can be passed to + * ures_openAvailableLocales, such as U_ICUDATA or U_ICUDATA_COLL. + * The empty string is equivalent to U_ICUDATA. + */ + ICUResourceBundleFactory(const UnicodeString& bundleName); + + /** + * Destructor + */ + virtual ~ICUResourceBundleFactory(); + +protected: + /** + * Return the supported IDs. This is the set of all locale names in ICULocaleData. + */ + virtual const Hashtable* getSupportedIDs(UErrorCode& status) const; + + /** + * Create the service. The default implementation returns the resource bundle + * for the locale, ignoring kind, and service. + */ + virtual UObject* handleCreate(const Locale& loc, int32_t kind, const ICUService* service, UErrorCode& status) const; + +public: + /** + * UObject boilerplate. + */ + static UClassID U_EXPORT2 getStaticClassID(); + virtual UClassID getDynamicClassID() const; + + +#ifdef SERVICE_DEBUG + public: + virtual UnicodeString& debug(UnicodeString& result) const; + virtual UnicodeString& debugClass(UnicodeString& result) const; +#endif + +}; + +/* + ****************************************************************** + */ + +class U_COMMON_API ICULocaleService : public ICUService +{ + private: + Locale fallbackLocale; + UnicodeString fallbackLocaleName; + + public: + /** + * Construct an ICULocaleService. + */ + ICULocaleService(); + + /** + * Construct an ICULocaleService with a name (useful for debugging). + */ + ICULocaleService(const UnicodeString& name); + + /** + * Destructor. + */ + virtual ~ICULocaleService(); + +#if 0 + // redeclare because of overload resolution rules? + // no, causes ambiguities since both UnicodeString and Locale have constructors that take a const char* + // need some compiler flag to remove warnings + UObject* get(const UnicodeString& descriptor, UErrorCode& status) const { + return ICUService::get(descriptor, status); + } + + UObject* get(const UnicodeString& descriptor, UnicodeString* actualReturn, UErrorCode& status) const { + return ICUService::get(descriptor, actualReturn, status); + } +#endif + + /** + * Convenience override for callers using locales. This calls + * get(Locale, int, Locale[]) with KIND_ANY for kind and null for + * actualReturn. + */ + UObject* get(const Locale& locale, UErrorCode& status) const; + + /** + * Convenience override for callers using locales. This calls + * get(Locale, int, Locale[]) with a null actualReturn. + */ + UObject* get(const Locale& locale, int32_t kind, UErrorCode& status) const; + + /** + * Convenience override for callers using locales. This calls + * get(Locale, String, Locale[]) with a null kind. + */ + UObject* get(const Locale& locale, Locale* actualReturn, UErrorCode& status) const; + + /** + * Convenience override for callers using locales. This uses + * createKey(Locale.toString(), kind) to create a key, calls getKey, and then + * if actualReturn is not null, returns the actualResult from + * getKey (stripping any prefix) into a Locale. + */ + UObject* get(const Locale& locale, int32_t kind, Locale* actualReturn, UErrorCode& status) const; + + /** + * Convenience override for callers using locales. This calls + * registerObject(Object, Locale, int32_t kind, int coverage) + * passing KIND_ANY for the kind, and VISIBLE for the coverage. + */ + virtual URegistryKey registerInstance(UObject* objToAdopt, const Locale& locale, UErrorCode& status); + + /** + * Convenience function for callers using locales. This calls + * registerObject(Object, Locale, int kind, int coverage) + * passing VISIBLE for the coverage. + */ + virtual URegistryKey registerInstance(UObject* objToAdopt, const Locale& locale, int32_t kind, UErrorCode& status); + + /** + * Convenience function for callers using locales. This instantiates + * a SimpleLocaleKeyFactory, and registers the factory. + */ + virtual URegistryKey registerInstance(UObject* objToAdopt, const Locale& locale, int32_t kind, int32_t coverage, UErrorCode& status); + + + /** + * (Stop compiler from complaining about hidden overrides.) + * Since both UnicodeString and Locale have constructors that take const char*, adding a public + * method that takes UnicodeString causes ambiguity at call sites that use const char*. + * We really need a flag that is understood by all compilers that will suppress the warning about + * hidden overrides. + */ + virtual URegistryKey registerInstance(UObject* objToAdopt, const UnicodeString& locale, UBool visible, UErrorCode& status); + + /** + * Convenience method for callers using locales. This returns the standard + * service ID enumeration. + */ + virtual StringEnumeration* getAvailableLocales(void) const; + + protected: + + /** + * Return the name of the current fallback locale. If it has changed since this was + * last accessed, the service cache is cleared. + */ + const UnicodeString& validateFallbackLocale() const; + + /** + * Override superclass createKey method. + */ + virtual ICUServiceKey* createKey(const UnicodeString* id, UErrorCode& status) const; + + /** + * Additional createKey that takes a kind. + */ + virtual ICUServiceKey* createKey(const UnicodeString* id, int32_t kind, UErrorCode& status) const; + + friend class ServiceEnumeration; +}; + +U_NAMESPACE_END + + /* UCONFIG_NO_SERVICE */ +#endif + + /* ICULSERV_H */ +#endif + |