Github user dawidwys commented on a diff in the pull request: https://github.com/apache/flink/pull/4153#discussion_r124999092 --- Diff: flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/compiler/NFACompiler.java --- @@ -455,6 +548,76 @@ private void addStopStateToLooping(final State<T> loopingState) { } /** + * Create all the states for the group pattern. + * + * @param groupPattern the group pattern to create the states for + * @param sinkState the state that the group pattern being converted should point to + * @param proceedState the state that the group pattern being converted should proceed to + * @param isOptional whether the group pattern being converted is optional + * @return the first state of the states of the group pattern + */ + private State<T> createGroupPatternState( + final GroupPattern<T, ?> groupPattern, + final State<T> sinkState, + final State<T> proceedState, + final boolean isOptional) { + final IterativeCondition<T> trueFunction = BooleanConditions.trueFunction(); + + Pattern<T, ?> oldCurrentPattern = currentPattern; + Pattern<T, ?> oldFollowingPattern = followingPattern; + GroupPattern<T, ?> oldGroupPattern = currentGroupPattern; + try { --- End diff -- What is the point of this `try` block? Why not: private State<T> createGroupPatternState( final GroupPattern<T, ?> groupPattern, final State<T> sinkState, final State<T> proceedState, final boolean isOptional) { final IterativeCondition<T> trueFunction = BooleanConditions.trueFunction(); Pattern<T, ?> oldCurrentPattern = currentPattern; Pattern<T, ?> oldFollowingPattern = followingPattern; GroupPattern<T, ?> oldGroupPattern = currentGroupPattern; State<T> lastSink = sinkState; currentGroupPattern = groupPattern; currentPattern = groupPattern.getRawPattern(); lastSink = createMiddleStates(lastSink); lastSink = convertPattern(lastSink); if (isOptional) { // for the first state of a group pattern, its PROCEED edge should point to // the following state of that group pattern lastSink.addProceed(proceedState, trueFunction); } currentPattern = oldCurrentPattern; followingPattern = oldFollowingPattern; currentGroupPattern = oldGroupPattern; return lastSink; }
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