// Clear our internal caches
internal static void ClearCachedData()
{
s_cachedCultures = null;
s_cachedRegions = null;
}
internal static CultureData GetCultureData(String cultureName, bool useUserOverride)
{
// First do a shortcut for Invariant
if (String.IsNullOrEmpty(cultureName))
{
return CultureData.Invariant;
}
// Try the hash table first
String hashName = AnsiToLower(useUserOverride ? cultureName : cultureName + '*');
StringCultureDataDictionary tempHashTable = s_cachedCultures;
if (tempHashTable == null)
{
// No table yet, make a new one
tempHashTable = new StringCultureDataDictionary();
}
else
{
// Check the hash table
bool ret;
CultureData retVal;
lock (s_lock)
{
ret = tempHashTable.TryGetValue(hashName, out retVal);
}
if (ret && retVal != null)
{
return retVal;
}
}
// Not found in the hash table, need to see if we can build one that works for us
CultureData culture = CreateCultureData(cultureName, useUserOverride);
if (culture == null)
{
return null;
}
// Found one, add it to the cache
lock (s_lock)
{
tempHashTable[hashName] = culture;
}
// Copy the hashtable to the corresponding member variables. This will potentially overwrite
// new tables simultaneously created by a new thread, but maximizes thread safety.
s_cachedCultures = tempHashTable;
return culture;
}
internal static CultureData GetCultureDataForRegion(String cultureName, bool useUserOverride)
{
// First do a shortcut for Invariant
if (String.IsNullOrEmpty(cultureName))
{
return CultureData.Invariant;
}
//
// First check if GetCultureData() can find it (ie: its a real culture)
//
CultureData retVal = GetCultureData(cultureName, useUserOverride);
if (retVal != null && (retVal.IsNeutralCulture == false)) return retVal;
//
// Not a specific culture, perhaps it's region-only name
// (Remember this isn't a core clr path where that's not supported)
//
// If it was neutral remember that so that RegionInfo() can throw the right exception
CultureData neutral = retVal;
// Try the hash table next
String hashName = AnsiToLower(useUserOverride ? cultureName : cultureName + '*');
StringCultureDataDictionary tempHashTable = s_cachedRegions;
if (tempHashTable == null)
{
// No table yet, make a new one
tempHashTable = new StringCultureDataDictionary();
}
else
{
// Check the hash table
lock (s_lock)
{
tempHashTable.TryGetValue(hashName, out retVal);
}
if (retVal != null)
{
return retVal;
}
}
//
// Not found in the hash table, look it up the hard way
//
// If not a valid mapping from the registry we'll have to try the hard coded table
if (retVal == null || (retVal.IsNeutralCulture == true))
{
// Not a valid mapping, try the hard coded table
string name;
if (RegionNames.TryGetValue(cultureName, out name))
{
// Make sure we can get culture data for it
retVal = GetCultureData(name, useUserOverride);
}
}
// If not found in the hard coded table we'll have to find a culture that works for us
if (retVal == null || (retVal.IsNeutralCulture == true))
{
retVal = GetCultureDataFromRegionName(cultureName);
}
// If we found one we can use, then cache it for next time
if (retVal != null && (retVal.IsNeutralCulture == false))
{
// first add it to the cache
lock (s_lock)
{
tempHashTable[hashName] = retVal;
}
// Copy the hashtable to the corresponding member variables. This will potentially overwrite
// new tables simultaneously created by a new thread, but maximizes thread safety.
s_cachedRegions = tempHashTable;
}
else
{
// Unable to find a matching culture/region, return null or neutral
// (regionInfo throws a more specific exception on neutrals)
retVal = neutral;
}
// Return the found culture to use, null, or the neutral culture.
return retVal;
}
