timedlist.java

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package concurrency.time;

public class TimedList implements Timed {

    private TimedList next;
    private Timed item;

    private TimedList(TimedList next, Timed item) {
        this.next = next; this.item=item;
    }

    public static TimedList add(TimedList list, Timed item) {
         return new TimedList(list, item);
    }

    public static TimedList remove(TimedList list, Timed target) {
        if (list == null) return null;
        return list.remove(target);
    }

    private TimedList remove(Timed target) {
      if (item == target) {
        return next;
      } else {
        TimedList new_next = remove(next,target);
        if (new_next == next ) return this;
        return new TimedList(new_next,item);
      }
    }

    public  void tick() throws TimeStop {
        if (next!=null) next.tick();
        item.tick();
    }

}