private FinishedTriggersBitSet readFinishedBits(ValueState<BitSet> state) { if (!isFinishedSetNeeded()) { // If no trigger in the tree will ever have finished bits, then we don't need to read them. // So that the code can be agnostic to that fact, we create a BitSet that is all 0 (not // finished) for each trigger in the tree. return FinishedTriggersBitSet.emptyWithCapacity(rootTrigger.getFirstIndexAfterSubtree()); } BitSet bitSet = state.read(); return bitSet == null ? FinishedTriggersBitSet.emptyWithCapacity(rootTrigger.getFirstIndexAfterSubtree()) : FinishedTriggersBitSet.fromBitSet(bitSet); }