edgeMap = new Object2IntOpenHashMap<String>();
nodeMap.defaultReturnValue(NULL_INDEX);
edgeMap.defaultReturnValue(NULL_INDEX);
nodeList = new ObjectArrayList<NodeDraftImpl>();
edgeList = new ObjectArrayList<EdgeDraftImpl>();
edgeTypeMap = new Object2IntOpenHashMap();
edgeTypeSets = new Long2ObjectMap[0];
factory = new ElementFactoryImpl(this);
nodeColumns = new Object2ObjectOpenHashMap<String, ColumnDraft>();
edgeColumns = new Object2ObjectOpenHashMap<String, ColumnDraft>();
}