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package cn.mapway.ui.client.mvc;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * 简单实现
 *
 * @author zhangjianshe
 */
public class ObservableImpl implements Observable {
    private List observers;

    @Override
    public void addObserver(Observer obersver) {
        if (observers == null) {
            observers = new ArrayList();
        }
        observers.add(obersver);

    }

    @Override
    public void rmoveObserver(Observer observer) {
        if (observers != null) {
            observers.remove(observer);
        }
    }

    /**
     * Notify all the Observer of a change
     */
    public void notifyObservers() {
        notifyObservers(null);
    }

    /**
     * Notify all the Observer of a change along with an Hint Object
     *
     * @param hint Hint to the Observers as to what they should do.
     */
    public void notifyObservers(Object hint) {
        if (observers != null) {
            Iterator iter = this.observers.iterator();
            while (iter.hasNext()) {
                Observer observer = (Observer) iter.next();
                observer.update(this, hint);
            }
        }
    }
}