package observer1;

import java.util.List;
import java.util.Observable;
import java.util.Observer;

/**
 * Implementation eines Observers.
 * 
 * @author Ralf Kunze (rkunze@uos.de), Institut fuer Informatik, Universitaet
 *         Osnabrueck
 * @date 15.06.2007
 */
public class AddierObserver implements Observer {

    private int result;
    
    /*
     * (non-Javadoc)
     * 
     * @see java.util.Observer#update(java.util.Observable, java.lang.Object)
     */
    public void update(Observable o, Object arg) {
        if(arg instanceof List) {
            List l = (List)arg;
            result = 0;
            for(Object object: l) {
                if(object instanceof Integer) {
                    result += (Integer)object;
                }
            }
            System.out.println("Neues Additionsergebnis = " + result);
        }

    }

}