Allow communication engines to deny resume by clock

src/main/java/altk/comm/engine/Broadcast.java

@@ -1020,12 +1020,9 @@ public abstract class Broadcast
 	
 	protected String resume(String reason) {
 		if (reason == ACTION_BY_CLOCK) {
-			boolean inAcceptqble = false;
 			if (this.reason == null) return null;
-			for (String acceptable  : getPauseModesResumableByClock()) {
-				if (this.reason.equalsIgnoreCase(acceptable)) inAcceptqble = true;
-			}
-			if (!inAcceptqble) return null;
+			boolean reason_is_ok = this.reason == ACTION_BY_CLOCK || !child_denies_resume_by_clock();
+			if (!reason_is_ok) return null;
 		}
 		if (!withinOperatingHours()) return "Cannot resume outside operating hours";
 		
@@ -1039,17 +1036,15 @@ public abstract class Broadcast
 			case SUCCESS:
 				resumeFlag.notifyAll();
 				return "Broadcast resumed";
+			case NO_CHANGE:
 			default:
 				return null;	
 			}
 	    }
 	}
 	
-	/** derived class may override by adding more modes */
-	protected List<String> getPauseModesResumableByClock() {
-		Vector<String> modes = new Vector<String>();
-		modes.add(ACTION_BY_CLOCK);
-		return modes;
+	protected boolean child_denies_resume_by_clock() {
+		return false;
 	}
 	
 	/**