public Lifecycle transitionTo(STATE next) {
Lifecycle nextLifecycle = null;
switch (next) {
case SUSPENDED: // only RUNNING instances can be SUSPENDED
if (STATE.RUNNING.equals(current)) {
nextLifecycle = new Lifecycle(instance, next);
instance.suspended = true;
break;
} else {
throw new IllegalTransitionException(current, next);
}
case ENDED: // both RUNNING and SUSPENDED instances can be ENDED
if (STATE.RUNNING.equals(current) || STATE.SUSPENDED.equals(current)) {
nextLifecycle = new Lifecycle(instance, next);
instance.suspended = false;
instance.endDate = new Date();
break;
} else {
throw new IllegalTransitionException(current, next);
}
case RUNNING: // only SUSPENDED instances can become RUNNING
if (STATE.SUSPENDED.equals(current)) {
nextLifecycle = new Lifecycle(instance, next);
instance.suspended = false;
break;
} else {
throw new IllegalTransitionException(current, next);
}
default:
throw new IllegalTransitionException(current, next);
}
return nextLifecycle;
}
