Method assert_existance

src/ifcparse/IfcFile.cpp:361–410

}

IfcUtil::IfcBaseClass* IfcParse::impl::rocks_db_file_storage::assert_existance(size_t number, instance_ref r) {
#ifdef IFOPSH_WITH_ROCKSDB
    if (r == IfcParse::impl::rocks_db_file_storage::entityinstance_ref) {
        auto it = instance_cache_.find(number);
        if (it != instance_cache_.end()) {
            return it->second;
        }
    } else {
        auto it = type_instance_cache_.find(number);
        if (it != type_instance_cache_.end()) {
            return it->second;
        }
    }
    
    std::string v;

    rocksdb::Status s = db->Get(rocksdb::ReadOptions{}, (r == entityinstance_ref ? "i|" : "t|") + std::to_string(number) + "|_", &v);
    if (s.ok()) {
        size_t s;
        memcpy(&s, v.data(), sizeof(size_t));
        if (s >= file->schema()->declarations().size()) {
            throw std::runtime_error("");
        }
        auto decl = file->schema()->declarations()[s];
        bool is_entity = decl->as_entity() != nullptr;
        if (is_entity != (r == entityinstance_ref)) {
            throw std::runtime_error("Incorrect reference");
        }
        IfcEntityInstanceData data(rocks_db_attribute_storage{});
        IfcUtil::IfcBaseClass* inst;
        if (file->instantiate_typed_instances) {
            inst = file->schema()->instantiate(decl, std::move(data));
        } else {
            inst = new IfcUtil::IfcLateBoundEntity(decl, std::move(data));
        }
        inst->id_ = number;
        inst->file_ = file;
        if (r == IfcParse::impl::rocks_db_file_storage::entityinstance_ref) {
            instance_cache_.insert({ number, inst });
        } else {
            type_instance_cache_.insert({ number, inst });
        }
        return inst;
    } else {
        throw IfcException("Instance #" + boost::lexical_cast<std::string>(number) + " not found");
    }
#else
	throw IfcException("RocksDB support not compiled in");
#endif
}

namespace {
    rocksdb::DB* init_db(const std::string& filepath, bool readonly) {