private IFAState getFromDfaTransitionTable(int stateIndex, int transitionIndex) {
    if (dfaTransitionTable.containsKey(stateIndex)) {
      return dfaTransitionTable.get(stateIndex).get(transitionIndex);
    } else {
      return null;
    }
  }
get next closure

@param nfaGraph
@param curClosure
@param transfer
@return if empty. return true
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/path/fa/dfa/graph/DFAGraph.java