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997 lines
36 KiB
997 lines
36 KiB
// © 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. *
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* All Rights Reserved. *
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*******************************************************************************
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*/
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#ifndef ICUSERV_H
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#define ICUSERV_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 ICUService;
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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/umisc.h"
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#include "hash.h"
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#include "uvector.h"
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#include "servnotf.h"
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class ICUServiceTest;
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U_NAMESPACE_BEGIN
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class ICUServiceKey;
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class ICUServiceFactory;
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class SimpleFactory;
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class ServiceListener;
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class ICUService;
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class DNCache;
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/*******************************************************************
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* ICUServiceKey
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*/
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/**
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* <p>ICUServiceKeys are used to communicate with factories to
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* generate an instance of the service. ICUServiceKeys define how
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* ids are canonicalized, provide both a current id and a current
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* descriptor to use in querying the cache and factories, and
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* determine the fallback strategy.</p>
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*
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* <p>ICUServiceKeys provide both a currentDescriptor and a currentID.
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* The descriptor contains an optional prefix, followed by '/'
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* and the currentID. Factories that handle complex keys,
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* for example number format factories that generate multiple
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* kinds of formatters for the same locale, use the descriptor
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* to provide a fully unique identifier for the service object,
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* while using the currentID (in this case, the locale string),
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* as the visible IDs that can be localized.</p>
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*
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* <p>The default implementation of ICUServiceKey has no fallbacks and
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* has no custom descriptors.</p>
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*/
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class U_COMMON_API ICUServiceKey : public UObject {
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private:
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const UnicodeString _id;
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protected:
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static const UChar PREFIX_DELIMITER;
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public:
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/**
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* <p>Construct a key from an id.</p>
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*
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* @param id the ID from which to construct the key.
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*/
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ICUServiceKey(const UnicodeString& id);
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/**
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* <p>Virtual destructor.</p>
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*/
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virtual ~ICUServiceKey();
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/**
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* <p>Return the original ID used to construct this key.</p>
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*
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* @return the ID used to construct this key.
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*/
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virtual const UnicodeString& getID() const;
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/**
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* <p>Return the canonical version of the original ID. This implementation
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* appends the original ID to result. Result is returned as a convenience.</p>
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*
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* @param result the output parameter to which the id will be appended.
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* @return the modified result.
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*/
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virtual UnicodeString& canonicalID(UnicodeString& result) const;
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/**
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* <p>Return the (canonical) current ID. This implementation appends
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* the canonical ID to result. Result is returned as a convenience.</p>
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*
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* @param result the output parameter to which the current id will be appended.
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* @return the modified result.
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*/
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virtual UnicodeString& currentID(UnicodeString& result) const;
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/**
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* <p>Return the current descriptor. This implementation appends
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* the current descriptor to result. Result is returned as a convenience.</p>
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*
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* <p>The current descriptor is used to fully
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* identify an instance of the service in the cache. A
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* factory may handle all descriptors for an ID, or just a
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* particular descriptor. The factory can either parse the
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* descriptor or use custom API on the key in order to
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* instantiate the service.</p>
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*
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* @param result the output parameter to which the current id will be appended.
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* @return the modified result.
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*/
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virtual UnicodeString& currentDescriptor(UnicodeString& result) const;
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/**
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* <p>If the key has a fallback, modify the key and return true,
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* otherwise return false. The current ID will change if there
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* is a fallback. No currentIDs should be repeated, and fallback
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* must eventually return false. This implementation has no fallbacks
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* and always returns false.</p>
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*
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* @return true if the ICUServiceKey changed to a valid fallback value.
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*/
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virtual UBool fallback();
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/**
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* <p>Return true if a key created from id matches, or would eventually
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* fallback to match, the canonical ID of this ICUServiceKey.</p>
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*
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* @param id the id to test.
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* @return true if this ICUServiceKey's canonical ID is a fallback of id.
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*/
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virtual UBool isFallbackOf(const UnicodeString& id) const;
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/**
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* <p>Return the prefix. This implementation leaves result unchanged.
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* Result is returned as a convenience.</p>
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*
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* @param result the output parameter to which the prefix will be appended.
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* @return the modified result.
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*/
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virtual UnicodeString& prefix(UnicodeString& result) const;
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/**
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* <p>A utility to parse the prefix out of a descriptor string. Only
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* the (undelimited) prefix, if any, remains in result. Result is returned as a
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* convenience.</p>
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*
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* @param result an input/output parameter that on entry is a descriptor, and
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* on exit is the prefix of that descriptor.
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* @return the modified result.
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*/
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static UnicodeString& parsePrefix(UnicodeString& result);
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/**
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* <p>A utility to parse the suffix out of a descriptor string. Only
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* the (undelimited) suffix, if any, remains in result. Result is returned as a
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* convenience.</p>
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*
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* @param result an input/output parameter that on entry is a descriptor, and
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* on exit is the suffix of that descriptor.
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* @return the modified result.
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*/
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static UnicodeString& parseSuffix(UnicodeString& result);
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public:
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/**
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* UObject RTTI boilerplate.
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* UObject RTTI boilerplate.
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*/
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virtual UClassID getDynamicClassID() const;
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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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* ICUServiceFactory
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*/
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/**
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* <p>An implementing ICUServiceFactory generates the service objects maintained by the
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* service. A factory generates a service object from a key,
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* updates id->factory mappings, and returns the display name for
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* a supported id.</p>
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*/
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class U_COMMON_API ICUServiceFactory : public UObject {
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public:
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virtual ~ICUServiceFactory();
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/**
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* <p>Create a service object from the key, if this factory
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* supports the key. Otherwise, return NULL.</p>
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*
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* <p>If the factory supports the key, then it can call
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* the service's getKey(ICUServiceKey, String[], ICUServiceFactory) method
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* passing itself as the factory to get the object that
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* the service would have created prior to the factory's
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* registration with the service. This can change the
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* key, so any information required from the key should
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* be extracted before making such a callback.</p>
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*
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* @param key the service key.
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* @param service the service with which this factory is registered.
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* @param status the error code status.
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* @return the service object, or NULL if the factory does not support the key.
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*/
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virtual UObject* create(const ICUServiceKey& key, const ICUService* service, UErrorCode& status) const = 0;
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/**
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* <p>Update result to reflect the IDs (not descriptors) that this
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* factory publicly handles. Result contains mappings from ID to
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* factory. On entry it will contain all (visible) mappings from
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* previously-registered factories.</p>
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*
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* <p>This function, together with getDisplayName, are used to
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* support ICUService::getDisplayNames. The factory determines
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* which IDs (of those it supports) it will make visible, and of
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* those, which it will provide localized display names for. In
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* most cases it will register mappings from all IDs it supports
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* to itself.</p>
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*
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* @param result the mapping table to update.
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* @param status the error code status.
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*/
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virtual void updateVisibleIDs(Hashtable& result, UErrorCode& status) const = 0;
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/**
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* <p>Return, in result, the display name of the id in the provided locale.
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* This is an id, not a descriptor. If the id is
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* not visible, sets result to bogus. If the
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* incoming result is bogus, it remains bogus. Result is returned as a
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* convenience. Results are not defined if id is not one supported by this
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* factory.</p>
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*
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* @param id a visible id supported by this factory.
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* @param locale the locale for which to generate the corresponding localized display name.
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* @param result output parameter to hold the display name.
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* @return result.
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*/
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virtual UnicodeString& getDisplayName(const UnicodeString& id, const Locale& locale, UnicodeString& result) const = 0;
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};
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/*
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******************************************************************
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*/
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/**
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* <p>A default implementation of factory. This provides default
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* implementations for subclasses, and implements a singleton
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* factory that matches a single ID and returns a single
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* (possibly deferred-initialized) instance. This implements
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* updateVisibleIDs to add a mapping from its ID to itself
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* if visible is true, or to remove any existing mapping
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* for its ID if visible is false. No localization of display
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* names is performed.</p>
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*/
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class U_COMMON_API SimpleFactory : public ICUServiceFactory {
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protected:
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UObject* _instance;
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const UnicodeString _id;
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const UBool _visible;
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public:
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/**
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* <p>Construct a SimpleFactory that maps a single ID to a single
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* service instance. If visible is true, the ID will be visible.
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* The instance must not be NULL. The SimpleFactory will adopt
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* the instance, which must not be changed subsequent to this call.</p>
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*
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* @param instanceToAdopt the service instance to adopt.
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* @param id the ID to assign to this service instance.
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* @param visible if true, the ID will be visible.
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*/
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SimpleFactory(UObject* instanceToAdopt, const UnicodeString& id, UBool visible = true);
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/**
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* <p>Destructor.</p>
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*/
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virtual ~SimpleFactory();
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/**
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* <p>This implementation returns a clone of the service instance if the factory's ID is equal to
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* the key's currentID. Service and prefix are ignored.</p>
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*
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* @param key the service key.
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* @param service the service with which this factory is registered.
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* @param status the error code status.
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* @return the service object, or NULL if the factory does not support the key.
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*/
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virtual UObject* create(const ICUServiceKey& key, const ICUService* service, UErrorCode& status) const;
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/**
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* <p>This implementation adds a mapping from ID -> this to result if visible is true,
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* otherwise it removes ID from result.</p>
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*
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* @param result the mapping table to update.
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* @param status the error code status.
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*/
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virtual void updateVisibleIDs(Hashtable& result, UErrorCode& status) const;
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/**
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* <p>This implementation returns the factory ID if it equals id and visible is true,
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* otherwise it returns the empty string. (This implementation provides
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* no localized id information.)</p>
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*
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* @param id a visible id supported by this factory.
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* @param locale the locale for which to generate the corresponding localized display name.
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* @param result output parameter to hold the display name.
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* @return result.
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*/
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virtual UnicodeString& getDisplayName(const UnicodeString& id, const Locale& locale, UnicodeString& result) const;
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public:
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/**
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* UObject RTTI boilerplate.
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* UObject RTTI boilerplate.
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*/
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virtual UClassID getDynamicClassID() const;
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#ifdef SERVICE_DEBUG
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public:
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virtual UnicodeString& debug(UnicodeString& toAppendTo) const;
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virtual UnicodeString& debugClass(UnicodeString& toAppendTo) 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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* <p>ServiceListener is the listener that ICUService provides by default.
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* ICUService will notifiy this listener when factories are added to
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* or removed from the service. Subclasses can provide
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* different listener interfaces that extend EventListener, and modify
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* acceptsListener and notifyListener as appropriate.</p>
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*/
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class U_COMMON_API ServiceListener : public EventListener {
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public:
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virtual ~ServiceListener();
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/**
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* <p>This method is called when the service changes. At the time of the
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* call this listener is registered with the service. It must
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* not modify the notifier in the context of this call.</p>
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*
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* @param service the service that changed.
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*/
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virtual void serviceChanged(const ICUService& service) const = 0;
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public:
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/**
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* UObject RTTI boilerplate.
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* UObject RTTI boilerplate.
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*/
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virtual UClassID getDynamicClassID() const;
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};
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/*
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******************************************************************
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*/
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/**
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* <p>A StringPair holds a displayName/ID pair. ICUService uses it
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* as the array elements returned by getDisplayNames.
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*/
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class U_COMMON_API StringPair : public UMemory {
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public:
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/**
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* <p>The display name of the pair.</p>
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*/
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const UnicodeString displayName;
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/**
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* <p>The ID of the pair.</p>
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*/
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const UnicodeString id;
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/**
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* <p>Creates a string pair from a displayName and an ID.</p>
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*
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* @param displayName the displayName.
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* @param id the ID.
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* @param status the error code status.
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* @return a StringPair if the creation was successful, otherwise NULL.
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*/
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static StringPair* create(const UnicodeString& displayName,
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const UnicodeString& id,
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UErrorCode& status);
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/**
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* <p>Return true if either string of the pair is bogus.</p>
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* @return true if either string of the pair is bogus.
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*/
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UBool isBogus() const;
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private:
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StringPair(const UnicodeString& displayName, const UnicodeString& id);
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};
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/*******************************************************************
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* ICUService
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*/
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/**
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* <p>A Service provides access to service objects that implement a
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* particular service, e.g. transliterators. Users provide a String
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* id (for example, a locale string) to the service, and get back an
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* object for that id. Service objects can be any kind of object. A
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* new service object is returned for each query. The caller is
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* responsible for deleting it.</p>
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*
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* <p>Services 'canonicalize' the query ID and use the canonical ID to
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* query for the service. The service also defines a mechanism to
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* 'fallback' the ID multiple times. Clients can optionally request
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* the actual ID that was matched by a query when they use an ID to
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* retrieve a service object.</p>
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*
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* <p>Service objects are instantiated by ICUServiceFactory objects
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* registered with the service. The service queries each
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* ICUServiceFactory in turn, from most recently registered to
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* earliest registered, until one returns a service object. If none
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* responds with a service object, a fallback ID is generated, and the
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* process repeats until a service object is returned or until the ID
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* has no further fallbacks.</p>
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*
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* <p>In ICU 2.4, UObject (the base class of service instances) does
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* not define a polymorphic clone function. ICUService uses clones to
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* manage ownership. Thus, for now, ICUService defines an abstract
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* method, cloneInstance, that clients must implement to create clones
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* of the service instances. This may change in future releases of
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* ICU.</p>
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*
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* <p>ICUServiceFactories can be dynamically registered and
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* unregistered with the service. When registered, an
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* ICUServiceFactory is installed at the head of the factory list, and
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* so gets 'first crack' at any keys or fallback keys. When
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* unregistered, it is removed from the service and can no longer be
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* located through it. Service objects generated by this factory and
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* held by the client are unaffected.</p>
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*
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* <p>If a service has variants (e.g., the different variants of
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* BreakIterator) an ICUServiceFactory can use the prefix of the
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* ICUServiceKey to determine the variant of a service to generate.
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* If it does not support all variants, it can request
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* previously-registered factories to handle the ones it does not
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* support.</p>
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*
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* <p>ICUService uses ICUServiceKeys to query factories and perform
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* fallback. The ICUServiceKey defines the canonical form of the ID,
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* and implements the fallback strategy. Custom ICUServiceKeys can be
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* defined that parse complex IDs into components that
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* ICUServiceFactories can more easily use. The ICUServiceKey can
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* cache the results of this parsing to save repeated effort.
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* ICUService provides convenience APIs that take UnicodeStrings and
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* generate default ICUServiceKeys for use in querying.</p>
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*
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* <p>ICUService provides API to get the list of IDs publicly
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* supported by the service (although queries aren't restricted to
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* this list). This list contains only 'simple' IDs, and not fully
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* unique IDs. ICUServiceFactories are associated with each simple ID
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* and the responsible factory can also return a human-readable
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* localized version of the simple ID, for use in user interfaces.
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* ICUService can also provide an array of the all the localized
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* visible IDs and their corresponding internal IDs.</p>
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*
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* <p>ICUService implements ICUNotifier, so that clients can register
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* to receive notification when factories are added or removed from
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* the service. ICUService provides a default EventListener
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* subinterface, ServiceListener, which can be registered with the
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* service. When the service changes, the ServiceListener's
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* serviceChanged method is called with the service as the
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* argument.</p>
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*
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* <p>The ICUService API is both rich and generic, and it is expected
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* that most implementations will statically 'wrap' ICUService to
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* present a more appropriate API-- for example, to declare the type
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* of the objects returned from get, to limit the factories that can
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* be registered with the service, or to define their own listener
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* interface with a custom callback method. They might also customize
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* ICUService by overriding it, for example, to customize the
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* ICUServiceKey and fallback strategy. ICULocaleService is a
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* subclass of ICUService that uses Locale names as IDs and uses
|
|
* ICUServiceKeys that implement the standard resource bundle fallback
|
|
* strategy. Most clients will wish to subclass it instead of
|
|
* ICUService.</p>
|
|
*/
|
|
class U_COMMON_API ICUService : public ICUNotifier {
|
|
protected:
|
|
/**
|
|
* Name useful for debugging.
|
|
*/
|
|
const UnicodeString name;
|
|
|
|
private:
|
|
|
|
/**
|
|
* Timestamp so iterators can be fail-fast.
|
|
*/
|
|
uint32_t timestamp;
|
|
|
|
/**
|
|
* All the factories registered with this service.
|
|
*/
|
|
UVector* factories;
|
|
|
|
/**
|
|
* The service cache.
|
|
*/
|
|
Hashtable* serviceCache;
|
|
|
|
/**
|
|
* The ID cache.
|
|
*/
|
|
Hashtable* idCache;
|
|
|
|
/**
|
|
* The name cache.
|
|
*/
|
|
DNCache* dnCache;
|
|
|
|
/**
|
|
* Constructor.
|
|
*/
|
|
public:
|
|
/**
|
|
* <p>Construct a new ICUService.</p>
|
|
*/
|
|
ICUService();
|
|
|
|
/**
|
|
* <p>Construct with a name (useful for debugging).</p>
|
|
*
|
|
* @param name a name to use in debugging.
|
|
*/
|
|
ICUService(const UnicodeString& name);
|
|
|
|
/**
|
|
* <p>Destructor.</p>
|
|
*/
|
|
virtual ~ICUService();
|
|
|
|
/**
|
|
* <p>Return the name of this service. This will be the empty string if none was assigned.
|
|
* Returns result as a convenience.</p>
|
|
*
|
|
* @param result an output parameter to contain the name of this service.
|
|
* @return the name of this service.
|
|
*/
|
|
UnicodeString& getName(UnicodeString& result) const;
|
|
|
|
/**
|
|
* <p>Convenience override for get(ICUServiceKey&, UnicodeString*). This uses
|
|
* createKey to create a key for the provided descriptor.</p>
|
|
*
|
|
* @param descriptor the descriptor.
|
|
* @param status the error code status.
|
|
* @return the service instance, or NULL.
|
|
*/
|
|
UObject* get(const UnicodeString& descriptor, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Convenience override for get(ICUServiceKey&, UnicodeString*). This uses
|
|
* createKey to create a key from the provided descriptor.</p>
|
|
*
|
|
* @param descriptor the descriptor.
|
|
* @param actualReturn a pointer to a UnicodeString to hold the matched descriptor, or NULL.
|
|
* @param status the error code status.
|
|
* @return the service instance, or NULL.
|
|
*/
|
|
UObject* get(const UnicodeString& descriptor, UnicodeString* actualReturn, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Convenience override for get(ICUServiceKey&, UnicodeString*).</p>
|
|
*
|
|
* @param key the key.
|
|
* @param status the error code status.
|
|
* @return the service instance, or NULL.
|
|
*/
|
|
UObject* getKey(ICUServiceKey& key, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Given a key, return a service object, and, if actualReturn
|
|
* is not NULL, the descriptor with which it was found in the
|
|
* first element of actualReturn. If no service object matches
|
|
* this key, returns NULL and leaves actualReturn unchanged.</p>
|
|
*
|
|
* <p>This queries the cache using the key's descriptor, and if no
|
|
* object in the cache matches, tries the key on each
|
|
* registered factory, in order. If none generates a service
|
|
* object for the key, repeats the process with each fallback of
|
|
* the key, until either a factory returns a service object, or the key
|
|
* has no fallback. If no object is found, the result of handleDefault
|
|
* is returned.</p>
|
|
*
|
|
* <p>Subclasses can override this method to further customize the
|
|
* result before returning it.
|
|
*
|
|
* @param key the key.
|
|
* @param actualReturn a pointer to a UnicodeString to hold the matched descriptor, or NULL.
|
|
* @param status the error code status.
|
|
* @return the service instance, or NULL.
|
|
*/
|
|
virtual UObject* getKey(ICUServiceKey& key, UnicodeString* actualReturn, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>This version of getKey is only called by ICUServiceFactories within the scope
|
|
* of a previous getKey call, to determine what previously-registered factories would
|
|
* have returned. For details, see getKey(ICUServiceKey&, UErrorCode&). Subclasses
|
|
* should not call it directly, but call through one of the other get functions.</p>
|
|
*
|
|
* @param key the key.
|
|
* @param actualReturn a pointer to a UnicodeString to hold the matched descriptor, or NULL.
|
|
* @param factory the factory making the recursive call.
|
|
* @param status the error code status.
|
|
* @return the service instance, or NULL.
|
|
*/
|
|
UObject* getKey(ICUServiceKey& key, UnicodeString* actualReturn, const ICUServiceFactory* factory, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Convenience override for getVisibleIDs(String) that passes null
|
|
* as the fallback, thus returning all visible IDs.</p>
|
|
*
|
|
* @param result a vector to hold the returned IDs.
|
|
* @param status the error code status.
|
|
* @return the result vector.
|
|
*/
|
|
UVector& getVisibleIDs(UVector& result, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Return a snapshot of the visible IDs for this service. This
|
|
* list will not change as ICUServiceFactories are added or removed, but the
|
|
* supported IDs will, so there is no guarantee that all and only
|
|
* the IDs in the returned list will be visible and supported by the
|
|
* service in subsequent calls.</p>
|
|
*
|
|
* <p>The IDs are returned as pointers to UnicodeStrings. The
|
|
* caller owns the IDs. Previous contents of result are discarded before
|
|
* new elements, if any, are added.</p>
|
|
*
|
|
* <p>matchID is passed to createKey to create a key. If the key
|
|
* is not NULL, its isFallbackOf method is used to filter out IDs
|
|
* that don't match the key or have it as a fallback.</p>
|
|
*
|
|
* @param result a vector to hold the returned IDs.
|
|
* @param matchID an ID used to filter the result, or NULL if all IDs are desired.
|
|
* @param status the error code status.
|
|
* @return the result vector.
|
|
*/
|
|
UVector& getVisibleIDs(UVector& result, const UnicodeString* matchID, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Convenience override for getDisplayName(const UnicodeString&, const Locale&, UnicodeString&) that
|
|
* uses the current default locale.</p>
|
|
*
|
|
* @param id the ID for which to retrieve the localized displayName.
|
|
* @param result an output parameter to hold the display name.
|
|
* @return the modified result.
|
|
*/
|
|
UnicodeString& getDisplayName(const UnicodeString& id, UnicodeString& result) const;
|
|
|
|
/**
|
|
* <p>Given a visible ID, return the display name in the requested locale.
|
|
* If there is no directly supported ID corresponding to this ID, result is
|
|
* set to bogus.</p>
|
|
*
|
|
* @param id the ID for which to retrieve the localized displayName.
|
|
* @param result an output parameter to hold the display name.
|
|
* @param locale the locale in which to localize the ID.
|
|
* @return the modified result.
|
|
*/
|
|
UnicodeString& getDisplayName(const UnicodeString& id, UnicodeString& result, const Locale& locale) const;
|
|
|
|
/**
|
|
* <p>Convenience override of getDisplayNames(const Locale&, const UnicodeString*) that
|
|
* uses the current default Locale as the locale and NULL for
|
|
* the matchID.</p>
|
|
*
|
|
* @param result a vector to hold the returned displayName/id StringPairs.
|
|
* @param status the error code status.
|
|
* @return the modified result vector.
|
|
*/
|
|
UVector& getDisplayNames(UVector& result, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Convenience override of getDisplayNames(const Locale&, const UnicodeString*) that
|
|
* uses NULL for the matchID.</p>
|
|
*
|
|
* @param result a vector to hold the returned displayName/id StringPairs.
|
|
* @param locale the locale in which to localize the ID.
|
|
* @param status the error code status.
|
|
* @return the modified result vector.
|
|
*/
|
|
UVector& getDisplayNames(UVector& result, const Locale& locale, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Return a snapshot of the mapping from display names to visible
|
|
* IDs for this service. This set will not change as factories
|
|
* are added or removed, but the supported IDs will, so there is
|
|
* no guarantee that all and only the IDs in the returned map will
|
|
* be visible and supported by the service in subsequent calls,
|
|
* nor is there any guarantee that the current display names match
|
|
* those in the result.</p>
|
|
*
|
|
* <p>The names are returned as pointers to StringPairs, which
|
|
* contain both the displayName and the corresponding ID. The
|
|
* caller owns the StringPairs. Previous contents of result are
|
|
* discarded before new elements, if any, are added.</p>
|
|
*
|
|
* <p>matchID is passed to createKey to create a key. If the key
|
|
* is not NULL, its isFallbackOf method is used to filter out IDs
|
|
* that don't match the key or have it as a fallback.</p>
|
|
*
|
|
* @param result a vector to hold the returned displayName/id StringPairs.
|
|
* @param locale the locale in which to localize the ID.
|
|
* @param matchID an ID used to filter the result, or NULL if all IDs are desired.
|
|
* @param status the error code status.
|
|
* @return the result vector. */
|
|
UVector& getDisplayNames(UVector& result,
|
|
const Locale& locale,
|
|
const UnicodeString* matchID,
|
|
UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>A convenience override of registerInstance(UObject*, const UnicodeString&, UBool)
|
|
* that defaults visible to true.</p>
|
|
*
|
|
* @param objToAdopt the object to register and adopt.
|
|
* @param id the ID to assign to this object.
|
|
* @param status the error code status.
|
|
* @return a registry key that can be passed to unregister to unregister
|
|
* (and discard) this instance.
|
|
*/
|
|
URegistryKey registerInstance(UObject* objToAdopt, const UnicodeString& id, UErrorCode& status);
|
|
|
|
/**
|
|
* <p>Register a service instance with the provided ID. The ID will be
|
|
* canonicalized. The canonicalized ID will be returned by
|
|
* getVisibleIDs if visible is true. The service instance will be adopted and
|
|
* must not be modified subsequent to this call.</p>
|
|
*
|
|
* <p>This issues a serviceChanged notification to registered listeners.</p>
|
|
*
|
|
* <p>This implementation wraps the object using
|
|
* createSimpleFactory, and calls registerFactory.</p>
|
|
*
|
|
* @param objToAdopt the object to register and adopt.
|
|
* @param id the ID to assign to this object.
|
|
* @param visible true if getVisibleIDs is to return this ID.
|
|
* @param status the error code status.
|
|
* @return a registry key that can be passed to unregister() to unregister
|
|
* (and discard) this instance.
|
|
*/
|
|
virtual URegistryKey registerInstance(UObject* objToAdopt, const UnicodeString& id, UBool visible, UErrorCode& status);
|
|
|
|
/**
|
|
* <p>Register an ICUServiceFactory. Returns a registry key that
|
|
* can be used to unregister the factory. The factory
|
|
* must not be modified subsequent to this call. The service owns
|
|
* all registered factories. In case of an error, the factory is
|
|
* deleted.</p>
|
|
*
|
|
* <p>This issues a serviceChanged notification to registered listeners.</p>
|
|
*
|
|
* <p>The default implementation accepts all factories.</p>
|
|
*
|
|
* @param factoryToAdopt the factory to register and adopt.
|
|
* @param status the error code status.
|
|
* @return a registry key that can be passed to unregister to unregister
|
|
* (and discard) this factory.
|
|
*/
|
|
virtual URegistryKey registerFactory(ICUServiceFactory* factoryToAdopt, UErrorCode& status);
|
|
|
|
/**
|
|
* <p>Unregister a factory using a registry key returned by
|
|
* registerInstance or registerFactory. After a successful call,
|
|
* the factory will be removed from the service factory list and
|
|
* deleted, and the key becomes invalid.</p>
|
|
*
|
|
* <p>This issues a serviceChanged notification to registered
|
|
* listeners.</p>
|
|
*
|
|
* @param rkey the registry key.
|
|
* @param status the error code status.
|
|
* @return true if the call successfully unregistered the factory.
|
|
*/
|
|
virtual UBool unregister(URegistryKey rkey, UErrorCode& status);
|
|
|
|
/**
|
|
* </p>Reset the service to the default factories. The factory
|
|
* lock is acquired and then reInitializeFactories is called.</p>
|
|
*
|
|
* <p>This issues a serviceChanged notification to registered listeners.</p>
|
|
*/
|
|
virtual void reset(void);
|
|
|
|
/**
|
|
* <p>Return true if the service is in its default state.</p>
|
|
*
|
|
* <p>The default implementation returns true if there are no
|
|
* factories registered.</p>
|
|
*/
|
|
virtual UBool isDefault(void) const;
|
|
|
|
/**
|
|
* <p>Create a key from an ID. If ID is NULL, returns NULL.</p>
|
|
*
|
|
* <p>The default implementation creates an ICUServiceKey instance.
|
|
* Subclasses can override to define more useful keys appropriate
|
|
* to the factories they accept.</p>
|
|
*
|
|
* @param a pointer to the ID for which to create a default ICUServiceKey.
|
|
* @param status the error code status.
|
|
* @return the ICUServiceKey corresponding to ID, or NULL.
|
|
*/
|
|
virtual ICUServiceKey* createKey(const UnicodeString* id, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Clone object so that caller can own the copy. In ICU2.4, UObject doesn't define
|
|
* clone, so we need an instance-aware method that knows how to do this.
|
|
* This is public so factories can call it, but should really be protected.</p>
|
|
*
|
|
* @param instance the service instance to clone.
|
|
* @return a clone of the passed-in instance, or NULL if cloning was unsuccessful.
|
|
*/
|
|
virtual UObject* cloneInstance(UObject* instance) const = 0;
|
|
|
|
|
|
/************************************************************************
|
|
* Subclassing API
|
|
*/
|
|
|
|
protected:
|
|
|
|
/**
|
|
* <p>Create a factory that wraps a single service object. Called by registerInstance.</p>
|
|
*
|
|
* <p>The default implementation returns an instance of SimpleFactory.</p>
|
|
*
|
|
* @param instanceToAdopt the service instance to adopt.
|
|
* @param id the ID to assign to this service instance.
|
|
* @param visible if true, the ID will be visible.
|
|
* @param status the error code status.
|
|
* @return an instance of ICUServiceFactory that maps this instance to the provided ID.
|
|
*/
|
|
virtual ICUServiceFactory* createSimpleFactory(UObject* instanceToAdopt, const UnicodeString& id, UBool visible, UErrorCode& status);
|
|
|
|
/**
|
|
* <p>Reinitialize the factory list to its default state. After this call, isDefault()
|
|
* must return true.</p>
|
|
*
|
|
* <p>This issues a serviceChanged notification to registered listeners.</p>
|
|
*
|
|
* <p>The default implementation clears the factory list.
|
|
* Subclasses can override to provide other default initialization
|
|
* of the factory list. Subclasses must not call this method
|
|
* directly, since it must only be called while holding write
|
|
* access to the factory list.</p>
|
|
*/
|
|
virtual void reInitializeFactories(void);
|
|
|
|
/**
|
|
* <p>Default handler for this service if no factory in the factory list
|
|
* handled the key passed to getKey.</p>
|
|
*
|
|
* <p>The default implementation returns NULL.</p>
|
|
*
|
|
* @param key the key.
|
|
* @param actualReturn a pointer to a UnicodeString to hold the matched descriptor, or NULL.
|
|
* @param status the error code status.
|
|
* @return the service instance, or NULL.
|
|
*/
|
|
virtual UObject* handleDefault(const ICUServiceKey& key, UnicodeString* actualReturn, UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Clear caches maintained by this service.</p>
|
|
*
|
|
* <p>Subclasses can override if they implement additional caches
|
|
* that need to be cleared when the service changes. Subclasses
|
|
* should generally not call this method directly, as it must only
|
|
* be called while synchronized on the factory lock.</p>
|
|
*/
|
|
virtual void clearCaches(void);
|
|
|
|
/**
|
|
* <p>Return true if the listener is accepted.</p>
|
|
*
|
|
* <p>The default implementation accepts the listener if it is
|
|
* a ServiceListener. Subclasses can override this to accept
|
|
* different listeners.</p>
|
|
*
|
|
* @param l the listener to test.
|
|
* @return true if the service accepts the listener.
|
|
*/
|
|
virtual UBool acceptsListener(const EventListener& l) const;
|
|
|
|
/**
|
|
* <p>Notify the listener of a service change.</p>
|
|
*
|
|
* <p>The default implementation assumes a ServiceListener.
|
|
* If acceptsListener has been overridden to accept different
|
|
* listeners, this should be overridden as well.</p>
|
|
*
|
|
* @param l the listener to notify.
|
|
*/
|
|
virtual void notifyListener(EventListener& l) const;
|
|
|
|
/************************************************************************
|
|
* Utilities for subclasses.
|
|
*/
|
|
|
|
/**
|
|
* <p>Clear only the service cache.</p>
|
|
*
|
|
* <p>This can be called by subclasses when a change affects the service
|
|
* cache but not the ID caches, e.g., when the default locale changes
|
|
* the resolution of IDs also changes, requiring the cache to be
|
|
* flushed, but not the visible IDs themselves.</p>
|
|
*/
|
|
void clearServiceCache(void);
|
|
|
|
/**
|
|
* <p>Return a map from visible IDs to factories.
|
|
* This must only be called when the mutex is held.</p>
|
|
*
|
|
* @param status the error code status.
|
|
* @return a Hashtable containing mappings from visible
|
|
* IDs to factories.
|
|
*/
|
|
const Hashtable* getVisibleIDMap(UErrorCode& status) const;
|
|
|
|
/**
|
|
* <p>Allow subclasses to read the time stamp.</p>
|
|
*
|
|
* @return the timestamp.
|
|
*/
|
|
int32_t getTimestamp(void) const;
|
|
|
|
/**
|
|
* <p>Return the number of registered factories.</p>
|
|
*
|
|
* @return the number of factories registered at the time of the call.
|
|
*/
|
|
int32_t countFactories(void) const;
|
|
|
|
private:
|
|
|
|
friend class ::ICUServiceTest; // give tests access to countFactories.
|
|
};
|
|
|
|
U_NAMESPACE_END
|
|
|
|
/* UCONFIG_NO_SERVICE */
|
|
#endif
|
|
|
|
/* ICUSERV_H */
|
|
#endif
|
|
|