Application: gvSIG desktop » Library: org.gvsig.tools

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA 02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.tools.observer;

import java.util.ArrayList;

import java.util.List;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public class ObservableHelper {

    private static final Logger logger = LoggerFactory.getLogger(ObservableHelper.class);

    private List observers = new ArrayList();

    public synchronized void addObserver(Observer o) {

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

            return;

        }

        this.observers.add(o);

    }

    public synchronized void deleteObserver(Observer o) {

        this.observers.remove(o);

    }

    public synchronized void deleteObservers() {

        this.observers = new ArrayList();

    }

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

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

            Observer o = (Observer) this.observers.get(i);

            try {

                o.update(observable, data);

            } catch (Exception ex) {

                logger.warn("Error notifying to the observers.", ex);

            }

        }

    }

    public Notification notifyObservers(Observable observable, String type, Object value) {

        Notification notification = new BaseNotification(type, new Object[]{value});

        this.notifyObservers(observable, notification);

        return notification;

    }

    public Notification notifyObservers(Observable observable, String type, Object value1, Object value2) {

        Notification notification = new BaseNotification(type, new Object[]{value1, value2});

        this.notifyObservers(observable, notification);

        return notification;

    }

    public Notification notifyObservers(Observable observable, String type, Object value1, Object value2, Object value3) {

        Notification notification = new BaseNotification(type, new Object[]{value1, value2, value3});

        this.notifyObservers(observable, notification);

        return notification;

    }

}