Method lookupCollation

src/jrd/intl.cpp:337–452

}

Collation* CharSetContainer::lookupCollation(thread_db* tdbb, USHORT tt_id)
{
	const USHORT id = TTYPE_TO_COLLATION(tt_id);

	if (id < charset_collations.getCount() && charset_collations[id] != NULL)
	{
		if (!charset_collations[id]->obsolete)
			return charset_collations[id];
	}

	CheckoutLockGuard guard(tdbb, createCollationMtx, FB_FUNCTION); // do we need it ?

	Collation* to_delete = NULL;

	if (id < charset_collations.getCount() && charset_collations[id] != NULL)
	{
		if (charset_collations[id]->obsolete)
		{
			// if obsolete collation is not used delete it immediately,
			// else wait until all references are released
			if (charset_collations[id]->useCount == 0)
			{
				charset_collations[id]->destroy(tdbb);
				delete charset_collations[id];
			}
			else
				to_delete = charset_collations[id];

			charset_collations[id] = NULL;
		}
		else
			return charset_collations[id];
	}

	SubtypeInfo info;
	if (MET_get_char_coll_subtype_info(tdbb, tt_id, &info))
	{
		CharSet* charset = INTL_charset_lookup(tdbb, TTYPE_TO_CHARSET(tt_id));

		if (TTYPE_TO_CHARSET(tt_id) != CS_METADATA)
		{
			Firebird::UCharBuffer specificAttributes;
			ULONG size = info.specificAttributes.getCount() * charset->maxBytesPerChar();

			size = INTL_convert_bytes(tdbb, TTYPE_TO_CHARSET(tt_id),
									  specificAttributes.getBuffer(size), size,
									  CS_METADATA, info.specificAttributes.begin(),
									  info.specificAttributes.getCount(), ERR_post);
			specificAttributes.shrink(size);
			info.specificAttributes = specificAttributes;
		}

		Attachment* const att = tdbb->getAttachment();
		AutoPtr<texttype> tt(FB_NEW_POOL(*att->att_pool) texttype);
		memset(tt, 0, sizeof(texttype));

		lookup_texttype(tt, &info);