Application: gvSIG desktop

/**

 * 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.fmap.mapcontext.layers;

import java.util.HashSet;

import java.util.Set;

import org.gvsig.fmap.mapcontext.rendering.legend.events.LegendChangedEvent;

import org.gvsig.fmap.mapcontext.rendering.legend.events.listeners.LegendListener;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * <p>Manages all legend listeners of a layer, notifying them any legend change event produced.</p>

 *

 */

public class LayerChangeSupport {

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

        /**

         * <p>The legend listeners of a layer.</p>

         */

        private final Set<LegendListener> listeners = new HashSet<>();

        /**

         * <p>Registers a <code>LegendListener</code>.</p>

         * 

         * @param listener the legend listener

         */

        public void addLayerListener(LegendListener listener) {

            if( listener == null ) {

                return;

            }

            listeners.add(listener);

        }

        /**

         * <p>Removes a registered <code>LegendListener</code>.</p>

         *

         * @param listener the legend listener

         */

        public void removeLayerListener(LegendListener listener) {

                listeners.remove(listener);

        }

        /**

         * <p>Notifies a legend change to all legend listeners registered.</p>

         *

         * @param e a legend event with the new legend and events that compound this one

         */

        public void callLegendChanged(LegendChangedEvent e) {

            for (LegendListener listener : listeners) {

                try {

                    listener.legendChanged(e);

                } catch(Exception ex) {

                    logger.warn("Error calling listener '"+listener.toString()+"'.",ex);

                }

            }

        }

}