Application: gvSIG desktop » gvSIG Document Layout

package org.gvsig.app.project.documents.layout;

import java.util.ArrayList;

import java.util.List;

import org.gvsig.tools.observer.Observable;

/**

 * The goal of this class is to be extended internally by a

 * class wishing to manage specific listeners.

 *

 * @author Cesar Martinez

 */

public abstract class CustomizableObserverHelper {

        private List listeners = new ArrayList();

        public synchronized void addObserver(Object o) {

                if( this.listeners.contains(o) ) {

                        return;

                }

                this.listeners.add(o);

        }

        public synchronized void deleteObserver(Object o) {

                this.listeners.remove(o);

        }

        public synchronized void deleteObservers() {

                this.listeners = new ArrayList();

        }

        public synchronized void notifyObservers(Object observable, Object data) {

                for(int i =0; i<this.listeners.size(); i++ ) {

                        Object o = (Object) this.listeners.get(i);

                        doNotify(o, data);

                }

        }

        protected abstract void doNotify(Object listener, Object data);

}