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import java.util.*;
//ObserverProtocol
public abstract aspect ObserverProtocol{
abstract pointcut stateChange(Subject subject);
after(Subject subject):stateChange(subject){
Iterator it=subject.getObservers().iterator();
while(it.hasNext()){
Observer observer=(Observer)it.next();
observer.update();
}
}
private Collection Subject.observers=new ArrayList();
public void Subject.addObserver(Observer observer){
observers.add(observer);
}
public void Subject.removeObserver(Observer observer){
observers.remove(observer);
}
public Collection Subject.getObservers()
{
return observers;
}
public void Subject.setObservers(Collection c) {
observers = c;
}
private Collection myCollection = new ArrayList();
public Collection returnsCollectionMethod() { return myCollection; }
public Collection C1.getCollection() {
return aCollection;
}
public void C1.setCollection(Collection c) {
aCollection = c;
}
}
class C1 {
public Collection aCollection;
}
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