org.apache.flink.cep.pattern.MalformedPatternException Java Examples

/**
		 * Compiles the given pattern into a {@link NFAFactory}. The NFA factory can be used to create
		 * multiple NFAs.
		 */
//		修改default->public
		public 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 pattern after match skip strategy.
 */
private void checkPatternSkipStrategy() {
	if (afterMatchSkipStrategy.getPatternName().isPresent()) {
		String patternName = afterMatchSkipStrategy.getPatternName().get();
		Pattern<T, ?> pattern = currentPattern;
		while (pattern.getPrevious() != null && !pattern.getName().equals(patternName)) {
			pattern = pattern.getPrevious();
		}

		// pattern name match check.
		if (!pattern.getName().equals(patternName)) {
			throw new MalformedPatternException("The pattern name specified in AfterMatchSkipStrategy " +
				"can not be found in the given Pattern");
		}
	}
}
 

/**
 * 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 pattern after match skip strategy.
 */
private void checkPatternSkipStrategy() {
	if (afterMatchSkipStrategy.getPatternName().isPresent()) {
		String patternName = afterMatchSkipStrategy.getPatternName().get();
		Pattern<T, ?> pattern = currentPattern;
		while (pattern.getPrevious() != null && !pattern.getName().equals(patternName)) {
			pattern = pattern.getPrevious();
		}

		// pattern name match check.
		if (!pattern.getName().equals(patternName)) {
			throw new MalformedPatternException("The pattern name specified in AfterMatchSkipStrategy " +
				"can not be found in the given Pattern");
		}
	}
}
 

/**
 * 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 pattern after match skip strategy.
 */
private void checkPatternSkipStrategy() {
	if (afterMatchSkipStrategy.getPatternName().isPresent()) {
		String patternName = afterMatchSkipStrategy.getPatternName().get();
		Pattern<T, ?> pattern = currentPattern;
		while (pattern.getPrevious() != null && !pattern.getName().equals(patternName)) {
			pattern = pattern.getPrevious();
		}

		// pattern name match check.
		if (!pattern.getName().equals(patternName)) {
			throw new MalformedPatternException("The pattern name specified in AfterMatchSkipStrategy " +
				"can not be found in the given Pattern");
		}
	}
}
 

/**
 * Checks if the given name is already used or not. If yes, it
 * throws a {@link MalformedPatternException}.
 *
 * @param name The name to be checked.
 */
public void checkNameUniqueness(String name) {
	if (usedNames.contains(name)) {
		throw new MalformedPatternException("Duplicate pattern name: " + name + ". Names must be unique.");
	}
	usedNames.add(name);
}
 

@Test
public void testNFACompilerUniquePatternName() {

	// adjust the rule
	expectedException.expect(MalformedPatternException.class);
	expectedException.expectMessage("Duplicate pattern name: start. Names must be unique.");

	Pattern<Event, ?> invalidPattern = Pattern.<Event>begin("start").where(new TestFilter())
		.followedBy("middle").where(new TestFilter())
		.followedBy("start").where(new TestFilter());

	// here we must have an exception because of the two "start" patterns with the same name.
	compile(invalidPattern, false);
}
 

@Test
public void testNFACompilerPatternEndsWithNotFollowedBy() {

	// adjust the rule
	expectedException.expect(MalformedPatternException.class);
	expectedException.expectMessage("NotFollowedBy is not supported as a last part of a Pattern!");

	Pattern<Event, ?> invalidPattern = Pattern.<Event>begin("start").where(new TestFilter())
		.followedBy("middle").where(new TestFilter())
		.notFollowedBy("end").where(new TestFilter());

	// here we must have an exception because of the two "start" patterns with the same name.
	compile(invalidPattern, false);
}
 

/**
 * Checks if the given name is already used or not. If yes, it
 * throws a {@link MalformedPatternException}.
 *
 * @param name The name to be checked.
 */
public void checkNameUniqueness(String name) {
	if (usedNames.contains(name)) {
		throw new MalformedPatternException("Duplicate pattern name: " + name + ". Names must be unique.");
	}
	usedNames.add(name);
}
 

@Test
public void testNFACompilerUniquePatternName() {

	// adjust the rule
	expectedException.expect(MalformedPatternException.class);
	expectedException.expectMessage("Duplicate pattern name: start. Names must be unique.");

	Pattern<Event, ?> invalidPattern = Pattern.<Event>begin("start").where(new TestFilter())
		.followedBy("middle").where(new TestFilter())
		.followedBy("start").where(new TestFilter());

	// here we must have an exception because of the two "start" patterns with the same name.
	compile(invalidPattern, false);
}
 

@Test
public void testNFACompilerPatternEndsWithNotFollowedBy() {

	// adjust the rule
	expectedException.expect(MalformedPatternException.class);
	expectedException.expectMessage("NotFollowedBy is not supported as a last part of a Pattern!");

	Pattern<Event, ?> invalidPattern = Pattern.<Event>begin("start").where(new TestFilter())
		.followedBy("middle").where(new TestFilter())
		.notFollowedBy("end").where(new TestFilter());

	// here we must have an exception because of the two "start" patterns with the same name.
	compile(invalidPattern, false);
}
 

/**
 * Checks if the given name is already used or not. If yes, it
 * throws a {@link MalformedPatternException}.
 *
 * @param name The name to be checked.
 */
public void checkNameUniqueness(String name) {
	if (usedNames.contains(name)) {
		throw new MalformedPatternException("Duplicate pattern name: " + name + ". Names must be unique.");
	}
	usedNames.add(name);
}
 

@Test
public void testNFACompilerUniquePatternName() {

	// adjust the rule
	expectedException.expect(MalformedPatternException.class);
	expectedException.expectMessage("Duplicate pattern name: start. Names must be unique.");

	Pattern<Event, ?> invalidPattern = Pattern.<Event>begin("start").where(new TestFilter())
		.followedBy("middle").where(new TestFilter())
		.followedBy("start").where(new TestFilter());

	// here we must have an exception because of the two "start" patterns with the same name.
	compile(invalidPattern, false);
}
 

@Test
public void testNFACompilerPatternEndsWithNotFollowedBy() {

	// adjust the rule
	expectedException.expect(MalformedPatternException.class);
	expectedException.expectMessage("NotFollowedBy is not supported as a last part of a Pattern!");

	Pattern<Event, ?> invalidPattern = Pattern.<Event>begin("start").where(new TestFilter())
		.followedBy("middle").where(new TestFilter())
		.notFollowedBy("end").where(new TestFilter());

	// here we must have an exception because of the two "start" patterns with the same name.
	compile(invalidPattern, false);
}