es.emergya.ui.base.plugins.PluginEventHandler.java Source code

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Here is the source code for es.emergya.ui.base.plugins.PluginEventHandler.java

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/*
 * Copyright (C) 2010, Emergya (http://www.emergya.es)
 *
 * @author <a href="mailto:jlrodriguez@emergya.es">Juan Lus Rodrguez</a>
 * @author <a href="mailto:marias@emergya.es">Mara Arias</a>
 *
 * This file is part of GoFleet
 *
 * This software 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 2 of the License, or
 * (at your option) any later version.
 *
 * This software 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * As a special exception, if you link this library with other files to
 * produce an executable, this library does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * This exception does not however invalidate any other reasons why the
 * executable file might be covered by the GNU General Public License.
 */
package es.emergya.ui.base.plugins;

import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class PluginEventHandler {
    private static final Log log = LogFactory.getLog(PluginEventHandler.class);

    private static Map<PluginListener, Set<PluginListener>> observables = new LinkedHashMap<PluginListener, Set<PluginListener>>();

    public static void fireChange(PluginListener source) {
        log.debug("fireChange(" + source + ")");
        try {
            PluginEvent event = new PluginEvent(source);
            fireChange(source, event);
        } catch (Throwable t) {
            log.error(t, t);
        }
    }

    private static void fireChange(PluginListener source, final PluginEvent event) {
        log.debug("fireChange(" + source + "," + event + ")");
        try {
            Set<PluginListener> observers = getObservables(source);
            if (observers != null)
                for (final PluginListener pl : observers) {
                    try {
                        if (!event.contains(pl)) {
                            event.add(pl);
                            // SwingWorker<Object, Object> sw = new
                            // SwingWorker<Object, Object>() {
                            // @Override
                            // protected Object doInBackground() {
                            try {
                                pl.refresh(event);
                            } catch (Throwable t) {
                                log.error("Error refrescando vista", t);
                            }
                            // return null;
                            // }
                            // };
                            // SwingUtilities.invokeLater(sw);
                            fireChange(pl, event);
                        }
                    } catch (Throwable t) {
                        log.error(t, t);
                    }
                }
        } catch (Throwable t) {
            log.error(t, t);
        }
    }

    private synchronized static Set<PluginListener> getObservables(PluginListener source) {
        return observables.get(source);
    }

    /**
     * Registra a observer para avisarle cuando observable se modifique
     * 
     * @param observer
     * @param observable
     */
    public static synchronized void register(PluginListener observer, PluginListener observable) {
        Set<PluginListener> observers = getObservables(observable);
        if (observers == null)
            observers = new HashSet<PluginListener>();
        observers.add(observer);
        observables.put(observable, observers);
    }

    /**
     * Deregistra a observer para no volverle a avisar cuando observable se
     * modifique
     * 
     * @param observer
     * @param observable
     */
    public static synchronized void deregister(PluginListener observer, PluginListener observable) {
        Set<PluginListener> observers = getObservables(observable);
        if (observers == null)
            observers = new HashSet<PluginListener>();
        observers.remove(observer);
        observables.put(observable, observers);
    }

}