Application: gvSIG desktop

package es.gva.cit.catalogClient.utils;

import java.util.Iterator;

import com.iver.utiles.extensionPoints.ExtensionPoint;

import com.iver.utiles.extensionPoints.ExtensionPoints;

import com.iver.utiles.extensionPoints.ExtensionPointsSingleton;

import es.gva.cit.catalogClient.drivers.ICatalogServiceDriver;

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * 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 2

 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

 *

 * $Id: CatalogDriverRegister.java 12758 2007-07-24 11:25:43Z jorpiell $

 * $Log$

 * Revision 1.1.2.1  2007-07-24 11:25:42  jorpiell

 * The registers has been refactorized

 *

 * Revision 1.1.2.1  2007/07/10 11:18:04  jorpiell

 * Added the registers

 *

 *

 */

/**

 * This class is used to register the different catalog

 * drivers and to retrieve them. It uses the gvSIG extension

 * points.

 * @author Jorge Piera LLodr? (jorge.piera@iver.es)

 */

public class CatalogDriverRegister {

        private static CatalogDriverRegister instance = null;

        private static final String DRIVER_REGISTER_NAME = "CatalogDrivers";        

        /**

         * This method cretaes the singleton instance

         *

         */

        private synchronized static void createInstance() {

                if (instance == null) { 

                        instance = new CatalogDriverRegister();

                }

        }

        /**

         * @return the remote service instance instance

         */

        public static CatalogDriverRegister getInstance() {

                if (instance == null){

                        createInstance();

                }

                return instance;

        }

        /**

         * This method is used to register a new catalog driver 

         * that manage a concrete protocol

         * @param driver

         * Catalog driver to register

         */

        public void register(ICatalogServiceDriver driver){

                ExtensionPoints extensionPoints = ExtensionPointsSingleton.getInstance();

            extensionPoints.add(DRIVER_REGISTER_NAME,driver.getServiceName(), driver);

        }

        /**

         * It is used to retrieve a driver that supports a concrete 

         * protocol

         * @param protocol

         * Catalog protocol

         * @return

         * The concrete catalog service driver

         */

        public ICatalogServiceDriver getDriver(String protocol){

                ExtensionPoint extensionPoint = (ExtensionPoint)ExtensionPointsSingleton.getInstance().get(DRIVER_REGISTER_NAME);

                Iterator keys = extensionPoint.keySet().iterator();

                while (keys.hasNext()){

                        Object driver = extensionPoint.get(keys.next());

                        if (((ICatalogServiceDriver)driver).getServiceName().compareTo(protocol) == 0){

                                return (ICatalogServiceDriver)driver;

                        }

                }

                return null;

        }

        /**

         * @return a list with all the gazetteer drivers

         */

        public ICatalogServiceDriver[] getDrivers(){

                ICatalogServiceDriver[] drivers = null;

                ExtensionPoint extensionPoint = (ExtensionPoint)ExtensionPointsSingleton.getInstance().get(DRIVER_REGISTER_NAME);

                drivers = new ICatalogServiceDriver[extensionPoint.keySet().size()];

                Iterator keys = extensionPoint.keySet().iterator();                

                int i = 0;

                while (keys.hasNext()){

                        drivers[i] = (ICatalogServiceDriver)extensionPoint.get(keys.next());

                        i++;

                }

                return drivers;

        }

}