/**
 * Creates a schedule with a given trigger
 * 
 * @param trigger the trigger to be contained in the schedule
 * @return a {@link ScheduleCreationBuilder} for creating
 *         an immutable {@link co.cask.cdap.internal.schedule.ScheduleCreationSpec}
 */
ScheduleCreationBuilder onTrigger(Trigger trigger);

public abstract static class AbstractCompositeTrigger extends ProtoTrigger {
  protected final Trigger[] triggers;

  public AbstractCompositeTrigger(Type type, Trigger... triggers) {
    super(type);
    this.triggers = triggers;
    validate();
  }

  public Trigger[] getTriggers() {
    return triggers;
  }
 
...
 
  }

  @Override
  public void validate() {
    ProtoTrigger.validateNotNull(getLeftTrigger(), "left trigger");
    ProtoTrigger.validateNotNull(getRightTrigger(), "right trigger");
  }
}

/**
 * Represents an AND trigger in REST requests/responses.
 */
public static class AndTrigger extends AbstractCompositeTrigger {
  public AndTrigger(Trigger... triggers) {
    super(Type.AND, triggers);
  }
}

/**
 * Represents an OR trigger in REST requests/responses.
 */
public static class OrTrigger extends AbstractCompositeTrigger {
  public OrTrigger(Trigger... triggers) {
    super(Type.OR, triggers);
  }
}

/**
 * A Trigger that schedules a ProgramSchedule, when all internal triggers are satisfied.
 */
public class AndTrigger extends AbstractCompositeTrigger implements SatisfiableTrigger {

  public AndTrigger(Trigger... triggers) {
    super(Type.AND, triggers);
  }

  @Override
  public boolean isSatisfied(List<Notification> notifications) {
    for (Trigger trigger : triggers) {
      if (!((SatisfiableTrigger) trigger).isSatisfied(notifications)) {
        return false;
      }
    }
    return true;
  }
}