How to use

createMiddleStates

method

in

org.apache.flink.cep.nfa.compiler.NFACompiler$NFAFactoryCompiler

currentGroupPattern = groupPattern;
currentPattern = groupPattern.getRawPattern();
lastSink = createMiddleStates(lastSink);
lastSink = convertPattern(lastSink);
if (isOptional) {

currentGroupPattern = groupPattern;
currentPattern = groupPattern.getRawPattern();
lastSink = createMiddleStates(lastSink);
lastSink = convertPattern(lastSink);
if (isOptional) {

/**
 * Create the states for the group pattern as a looping one.
 *
 * @param groupPattern the group pattern to create the states for
 * @param sinkState the state that the group pattern being converted should point to
 * @return the first state of the states of the group pattern
 */
private State<T> createLoopingGroupPatternState(
  final GroupPattern<T, ?> groupPattern,
  final State<T> sinkState) {
  final IterativeCondition<T> proceedCondition = getTrueFunction();
  Pattern<T, ?> oldCurrentPattern = currentPattern;
  Pattern<T, ?> oldFollowingPattern = followingPattern;
  GroupPattern<T, ?> oldGroupPattern = currentGroupPattern;
  final State<T> dummyState = createState(currentPattern.getName(), State.StateType.Normal);
  State<T> lastSink = dummyState;
  currentGroupPattern = groupPattern;
  currentPattern = groupPattern.getRawPattern();
  lastSink = createMiddleStates(lastSink);
  lastSink = convertPattern(lastSink);
  lastSink.addProceed(sinkState, proceedCondition);
  dummyState.addProceed(lastSink, proceedCondition);
  currentPattern = oldCurrentPattern;
  followingPattern = oldFollowingPattern;
  currentGroupPattern = oldGroupPattern;
  return lastSink;
}

/**
 * Create the states for the group pattern as a looping one.
 *
 * @param groupPattern the group pattern to create the states for
 * @param sinkState the state that the group pattern being converted should point to
 * @return the first state of the states of the group pattern
 */
private State<T> createLoopingGroupPatternState(
  final GroupPattern<T, ?> groupPattern,
  final State<T> sinkState) {
  final IterativeCondition<T> proceedCondition = getTrueFunction();
  Pattern<T, ?> oldCurrentPattern = currentPattern;
  Pattern<T, ?> oldFollowingPattern = followingPattern;
  GroupPattern<T, ?> oldGroupPattern = currentGroupPattern;
  final State<T> dummyState = createState(currentPattern.getName(), State.StateType.Normal);
  State<T> lastSink = dummyState;
  currentGroupPattern = groupPattern;
  currentPattern = groupPattern.getRawPattern();
  lastSink = createMiddleStates(lastSink);
  lastSink = convertPattern(lastSink);
  lastSink.addProceed(sinkState, proceedCondition);
  dummyState.addProceed(lastSink, proceedCondition);
  currentPattern = oldCurrentPattern;
  followingPattern = oldFollowingPattern;
  currentGroupPattern = oldGroupPattern;
  return lastSink;
}

/**
 * Compiles the given pattern into a {@link NFAFactory}. The NFA factory can be used to create
 * multiple NFAs.
 */
void compileFactory() {
  if (currentPattern.getQuantifier().getConsumingStrategy() == Quantifier.ConsumingStrategy.NOT_FOLLOW) {
    throw new MalformedPatternException("NotFollowedBy is not supported as a last part of a Pattern!");
  }
  checkPatternNameUniqueness();
  checkPatternSkipStrategy();
  // we're traversing the pattern from the end to the beginning --> the first state is the final state
  State<T> sinkState = createEndingState();
  // add all the normal states
  sinkState = createMiddleStates(sinkState);
  // add the beginning state
  createStartState(sinkState);
}

/**
 * Compiles the given pattern into a {@link NFAFactory}. The NFA factory can be used to create
 * multiple NFAs.
 */
void compileFactory() {
  if (currentPattern.getQuantifier().getConsumingStrategy() == Quantifier.ConsumingStrategy.NOT_FOLLOW) {
    throw new MalformedPatternException("NotFollowedBy is not supported as a last part of a Pattern!");
  }
  checkPatternNameUniqueness();
  checkPatternSkipStrategy();
  // we're traversing the pattern from the end to the beginning --> the first state is the final state
  State<T> sinkState = createEndingState();
  // add all the normal states
  sinkState = createMiddleStates(sinkState);
  // add the beginning state
  createStartState(sinkState);
}

/**
 * Compiles the given pattern into a {@link NFAFactory}. The NFA factory can be used to create
 * multiple NFAs.
 */
void compileFactory() {
  if (currentPattern.getQuantifier().getConsumingStrategy() == Quantifier.ConsumingStrategy.NOT_FOLLOW) {
    throw new MalformedPatternException("NotFollowedBy is not supported as a last part of a Pattern!");
  }
  // we're traversing the pattern from the end to the beginning --> the first state is the final state
  State<T> sinkState = createEndingState();
  // add all the normal states
  sinkState = createMiddleStates(sinkState);
  // add the beginning state
  createStartState(sinkState);
}

currentGroupPattern = groupPattern;
currentPattern = groupPattern.getRawPattern();
lastSink = createMiddleStates(lastSink);
lastSink = convertPattern(lastSink);
if (isOptional) {

/**
 * Create the states for the group pattern as a looping one.
 *
 * @param groupPattern the group pattern to create the states for
 * @param sinkState the state that the group pattern being converted should point to
 * @return the first state of the states of the group pattern
 */
private State<T> createLoopingGroupPatternState(
  final GroupPattern<T, ?> groupPattern,
  final State<T> sinkState) {
  final IterativeCondition<T> proceedCondition = getTrueFunction();
  Pattern<T, ?> oldCurrentPattern = currentPattern;
  Pattern<T, ?> oldFollowingPattern = followingPattern;
  GroupPattern<T, ?> oldGroupPattern = currentGroupPattern;
  final State<T> dummyState = createState(currentPattern.getName(), State.StateType.Normal);
  State<T> lastSink = dummyState;
  currentGroupPattern = groupPattern;
  currentPattern = groupPattern.getRawPattern();
  lastSink = createMiddleStates(lastSink);
  lastSink = convertPattern(lastSink);
  lastSink.addProceed(sinkState, proceedCondition);
  dummyState.addProceed(lastSink, proceedCondition);
  currentPattern = oldCurrentPattern;
  followingPattern = oldFollowingPattern;
  currentGroupPattern = oldGroupPattern;
  return lastSink;
}

/**
 * Compiles the given pattern into a {@link NFAFactory}. The NFA factory can be used to create
 * multiple NFAs.
 */
void compileFactory() {
  if (currentPattern.getQuantifier().getConsumingStrategy() == Quantifier.ConsumingStrategy.NOT_FOLLOW) {
    throw new MalformedPatternException("NotFollowedBy is not supported as a last part of a Pattern!");
  }
  checkPatternNameUniqueness();
  checkPatternSkipStrategy();
  // we're traversing the pattern from the end to the beginning --> the first state is the final state
  State<T> sinkState = createEndingState();
  // add all the normal states
  sinkState = createMiddleStates(sinkState);
  // add the beginning state
  createStartState(sinkState);
}