added isOnTheFlyID()

Change-Id: Ifddbec485814e3287e671e6bc4059689ca3f6c93

i18nlangtag/source/languagetag/languagetag.cxx

@@ -126,6 +126,17 @@ static LanguageType getNextOnTheFlyLanguage()
 }
 
 
+// static
+bool LanguageTag::isOnTheFlyID( LanguageType nLang )
+{
+    LanguageType nPri = MsLangId::getPrimaryLanguage( nLang);
+    LanguageType nSub = MsLangId::getSubLanguage( nLang);
+    return
+        LANGUAGE_ON_THE_FLY_START <= nPri && nPri <= LANGUAGE_ON_THE_FLY_END &&
+        LANGUAGE_ON_THE_FLY_SUB_START <= nSub && nSub <= LANGUAGE_ON_THE_FLY_SUB_END;
+}
+
+
 /** A reference holder for liblangtag data de/initialization, one static
     instance. Currently implemented such that the first "ref" inits and dtor
     (our library deinitialized) tears down.

include/i18nlangtag/languagetag.hxx

@@ -484,6 +484,9 @@ public:
      */
     static com::sun::star::lang::Locale convertToLocaleWithFallback( const OUString& rBcp47 );
 
+    /** If nLang is a generated on-the-fly LangID */
+    static bool         isOnTheFlyID( LanguageType nLang );
+
     typedef ::boost::shared_ptr< LanguageTagImpl > ImplPtr;
 
 private: