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