const Hashtable*
LocaleUtility::getAvailableLocaleNames(const UnicodeString& bundleID)
{
// LocaleUtility_cache is a hash-of-hashes. The top-level keys
// are path strings ('bundleID') passed to
// ures_openAvailableLocales. The top-level values are
// second-level hashes. The second-level keys are result strings
// from ures_openAvailableLocales. The second-level values are
// garbage ((void*)1 or other random pointer).
UErrorCode status = U_ZERO_ERROR;
umtx_initOnce(LocaleUtilityInitOnce, locale_utility_init, status);
Hashtable *cache = LocaleUtility_cache;
if (cache == NULL) {
// Catastrophic failure.
return NULL;
}
Hashtable* htp;
umtx_lock(NULL);
htp = (Hashtable*) cache->get(bundleID);
umtx_unlock(NULL);
if (htp == NULL) {
htp = new Hashtable(status);
if (htp && U_SUCCESS(status)) {
CharString cbundleID;
cbundleID.appendInvariantChars(bundleID, status);
const char* path = cbundleID.isEmpty() ? NULL : cbundleID.data();
UEnumeration *uenum = ures_openAvailableLocales(path, &status);
for (;;) {
const UChar* id = uenum_unext(uenum, NULL, &status);
if (id == NULL) {
break;
}
htp->put(UnicodeString(id), (void*)htp, status);
}
uenum_close(uenum);
if (U_FAILURE(status)) {
delete htp;
return NULL;
}
umtx_lock(NULL);
Hashtable *t = static_cast<Hashtable *>(cache->get(bundleID));
if (t != NULL) {
// Another thread raced through this code, creating the cache entry first.
// Discard ours and return theirs.
umtx_unlock(NULL);
delete htp;
htp = t;
} else {
cache->put(bundleID, (void*)htp, status);
umtx_unlock(NULL);
}
}
}
return htp;
}
const Hashtable *
LocaleUtility::getAvailableLocaleNames(const UnicodeString & bundleID)
{
// LocaleUtility_cache is a hash-of-hashes. The top-level keys
// are path strings ('bundleID') passed to
// ures_openAvailableLocales. The top-level values are
// second-level hashes. The second-level keys are result strings
// from ures_openAvailableLocales. The second-level values are
// garbage ((void*)1 or other random pointer).
UErrorCode status = U_ZERO_ERROR;
Hashtable * cache;
umtx_lock(NULL);
cache = LocaleUtility_cache;
umtx_unlock(NULL);
if (cache == NULL)
{
cache = new Hashtable(status);
if (cache == NULL || U_FAILURE(status))
{
return NULL; // catastrophic failure; e.g. out of memory
}
cache->setValueDeleter(uhash_deleteHashtable);
Hashtable * h; // set this to final LocaleUtility_cache value
umtx_lock(NULL);
h = LocaleUtility_cache;
if (h == NULL)
{
LocaleUtility_cache = h = cache;
cache = NULL;
ucln_common_registerCleanup(UCLN_COMMON_SERVICE, service_cleanup);
}
umtx_unlock(NULL);
if (cache != NULL)
{
delete cache;
}
cache = h;
}
U_ASSERT(cache != NULL);
Hashtable * htp;
umtx_lock(NULL);
htp = (Hashtable *) cache->get(bundleID);
umtx_unlock(NULL);
if (htp == NULL)
{
htp = new Hashtable(status);
if (htp && U_SUCCESS(status))
{
CharString cbundleID;
cbundleID.appendInvariantChars(bundleID, status);
const char * path = cbundleID.isEmpty() ? NULL : cbundleID.data();
UEnumeration * uenum = ures_openAvailableLocales(path, &status);
for (;;)
{
const UChar * id = uenum_unext(uenum, NULL, &status);
if (id == NULL)
{
break;
}
htp->put(UnicodeString(id), (void *)htp, status);
}
uenum_close(uenum);
if (U_FAILURE(status))
{
delete htp;
return NULL;
}
umtx_lock(NULL);
cache->put(bundleID, (void *)htp, status);
umtx_unlock(NULL);
}
}
return htp;
}