flag-filter.java

// two topics that this consumer cares about
List assignedTopics = ["demo.topic.one", "demo.topic.two"]

// all of the feature flags
List flags = [
	"topic_demo.topic.one",
	"ui-feature-flag",
	"topic_important.topic"
]

// the flags that this consumer actually cares about
List assignedTopicFlags = toggles
		.stream()
		.filter(t -> t.startsWith('topic_') && assignedTopics.contains(getTopicName(t))
		.collect(toList());

// assignedTopicFlags = ["topic_demo.topic.one"]