How to use

checkPatternNameUniqueness

method

in

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

/**
 * 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);
}

/**
 * Check if the given pattern's name is already used or not. If yes, it
 * throws a {@link MalformedPatternException}.
 *
 * @param pattern The pattern to be checked
 */
private void checkPatternNameUniqueness(final Pattern pattern) {
  if (pattern instanceof GroupPattern) {
    Pattern patternToCheck = ((GroupPattern) pattern).getRawPattern();
    while (patternToCheck != null) {
      checkPatternNameUniqueness(patternToCheck);
      patternToCheck = patternToCheck.getPrevious();
    }
  } else {
    stateNameHandler.checkNameUniqueness(pattern.getName());
  }
}

/**
 * Check if the given pattern's name is already used or not. If yes, it
 * throws a {@link MalformedPatternException}.
 *
 * @param pattern The pattern to be checked
 */
private void checkPatternNameUniqueness(final Pattern pattern) {
  if (pattern instanceof GroupPattern) {
    Pattern patternToCheck = ((GroupPattern) pattern).getRawPattern();
    while (patternToCheck != null) {
      checkPatternNameUniqueness(patternToCheck);
      patternToCheck = patternToCheck.getPrevious();
    }
  } else {
    stateNameHandler.checkNameUniqueness(pattern.getName());
  }
}

/**
 * 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);
}

/**
 * Check if there are duplicate pattern names. If yes, it
 * throws a {@link MalformedPatternException}.
 */
private void checkPatternNameUniqueness() {
  // make sure there is no pattern with name "$endState$"
  stateNameHandler.checkNameUniqueness(ENDING_STATE_NAME);
  Pattern patternToCheck = currentPattern;
  while (patternToCheck != null) {
    checkPatternNameUniqueness(patternToCheck);
    patternToCheck = patternToCheck.getPrevious();
  }
  stateNameHandler.clear();
}

/**
 * Check if there are duplicate pattern names. If yes, it
 * throws a {@link MalformedPatternException}.
 */
private void checkPatternNameUniqueness() {
  // make sure there is no pattern with name "$endState$"
  stateNameHandler.checkNameUniqueness(ENDING_STATE_NAME);
  Pattern patternToCheck = currentPattern;
  while (patternToCheck != null) {
    checkPatternNameUniqueness(patternToCheck);
    patternToCheck = patternToCheck.getPrevious();
  }
  stateNameHandler.clear();
}

/**
 * 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);
}

/**
 * Check if the given pattern's name is already used or not. If yes, it
 * throws a {@link MalformedPatternException}.
 *
 * @param pattern The pattern to be checked
 */
private void checkPatternNameUniqueness(final Pattern pattern) {
  if (pattern instanceof GroupPattern) {
    Pattern patternToCheck = ((GroupPattern) pattern).getRawPattern();
    while (patternToCheck != null) {
      checkPatternNameUniqueness(patternToCheck);
      patternToCheck = patternToCheck.getPrevious();
    }
  } else {
    stateNameHandler.checkNameUniqueness(pattern.getName());
  }
}

/**
 * Check if there are duplicate pattern names. If yes, it
 * throws a {@link MalformedPatternException}.
 */
private void checkPatternNameUniqueness() {
  // make sure there is no pattern with name "$endState$"
  stateNameHandler.checkNameUniqueness(ENDING_STATE_NAME);
  Pattern patternToCheck = currentPattern;
  while (patternToCheck != null) {
    checkPatternNameUniqueness(patternToCheck);
    patternToCheck = patternToCheck.getPrevious();
  }
  stateNameHandler.clear();
}