@Override
	public String[] profilesToActivate() {
		if (cron != null) {
			return USE_CRON;
		}
		else if (fixedDelay != null) {
			return USE_DELAY;
		}
		else {
			return USE_DATE;
		}
	}
Describes options to the {@code trigger} source module.

@author Eric Bottard
@author Florent Biville
@author Gary Russell
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/TriggerSourceOptionsMetadata.java