Optimized Time preflet:

* use upon-demand initialization in BTimeZone to avoid unnecessary work
* renamed BTimeZone::Code() to BTimeZone::ID() and adjusted all callers
* avoid using BCountry in the Time preflet for the time being, this means
  the icon-flags are gone for now (but they could be re-added if the demand
  is pressing ;-)
* group the timezones by regions and then by country instead
The performance improvement is considerable and I personally think the new grouping is an improvement, too. Please share your thoughts!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38322 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/locale/TimeZone.h

@@ -9,12 +9,20 @@
 #include <String.h>
 
 
+namespace icu_44 {
+	class TimeZone;
+}
+
+
 class BTimeZone {
 public:
-								BTimeZone(const char* zoneCode = NULL);
+								BTimeZone(const char* zoneID = NULL);
+								BTimeZone(const BTimeZone& other);
 								~BTimeZone();
 
-			const BString&		Code() const;
+			BTimeZone&			operator=(const BTimeZone& source);
+
+			const BString&		ID() const;
 			const BString&		Name() const;
 			const BString&		DaylightSavingName() const;
 			const BString&		ShortName() const;
@@ -24,20 +32,22 @@ public:
 
 			status_t			InitCheck() const;
 
-			status_t			SetTo(const char* zoneCode);
+			status_t			SetTo(const char* zoneID);
 
 	static  const char*			kNameOfGmtZone;
 
 private:
-			BString				fCode;
-			BString				fName;
-			BString				fDaylightSavingName;
-			BString				fShortName;
-			BString				fShortDaylightSavingName;
-			int					fOffsetFromGMT;
-			bool				fSupportsDaylightSaving;
-
+			icu_44::TimeZone*	fIcuTimeZone;
 			status_t			fInitStatus;
+
+	mutable uint32				fInitializedFields;
+	mutable BString				fZoneID;
+	mutable BString				fName;
+	mutable BString				fDaylightSavingName;
+	mutable BString				fShortName;
+	mutable BString				fShortDaylightSavingName;
+	mutable int					fOffsetFromGMT;
+	mutable bool				fSupportsDaylightSaving;
 };