Application: gvSIG desktop

/* 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

 */

package org.gvsig.catalog.loaders;

import java.io.IOException;

import java.util.Map;

import java.util.TreeMap;

import org.gvsig.catalog.schemas.Resource;

import org.gvsig.fmap.mapcontext.layers.FLayer;

import org.gvsig.i18n.Messages;

import org.gvsig.tools.extensionpoint.ExtensionPoint;

import org.gvsig.utils.extensionPointsOld.ExtensionPointsSingleton;

/**

 * This class is used to load a WCS  layer in gvSIG

 * 

 * @author Jorge Piera Llodra (piera_jor@gva.es)

 */

public class WCSLayerLoader extends GvSigLayerLoader{

        public WCSLayerLoader(Resource resource) {

                super(resource);

        }

        /**

         * This method loads a WSC layer from a full URL

         * @param link

         * @throws LayerLoaderException 

         */

        public void loadLayer() throws LayerLoaderException {

                String link = getResource().getLinkage();

                String name = getResource().getName();

                try {

                        FLayer flayer = createWCSLayer(link,name);

                        addLayerToView(flayer);

                } catch (IOException e) {

                        throw new LayerLoaderException(e.getMessage(),getWindowMessage());

                }         

        }           

        private FLayer createWCSLayer(String link,String name) throws IOException, LayerLoaderException {

                Map args = initFromQueryString(link,name);

                ExtensionPoint extensionPoint = (ExtensionPoint)ExtensionPointsSingleton.getInstance().get("CatalogLayers");

                try {

                        return (FLayer)extensionPoint.create("OGC:WCS", args  );

                } catch(Exception e) {

                        throw new LayerLoaderException(getErrorMessage(),getWindowMessage());

                }                

        }

        /**

         * Builds a coverage starting from a full GetCoverage URL.

         * (Using this is not a regular function)

         */

        private TreeMap initFromQueryString(String link,String name){

                String host = null;

                String queryString = null;

                if (link.compareTo("?")==0){

                        host = link.substring(0,link.indexOf('?'));

                        queryString = link.substring(link.indexOf('?')+1);

                }else{

                        host = link;

                        queryString = "";

                }

                queryString = link.substring(link.indexOf('?')+1);

                TreeMap map = new TreeMap(); 

                String[] params = queryString.split("&");

                for (int i = 0; i < params.length; i++) {

                        if (params[i]!= null){

                                String[] nameValue = params[i].split("=");

                                if (nameValue.length == 1){

                                        map.put(nameValue[0].toUpperCase(), "");

                                }else if(nameValue.length == 2){

                                        map.put(nameValue[0].toUpperCase(), nameValue[1]);

                                }

                        }

                }

                map.put("HOST",link);

                if ((name != null) && (!name.equals(""))){

                        map.put("COVERAGE",name);

                }

                return map;

        }        

        /*

         *  (non-Javadoc)

         * @see es.gva.cit.gvsig.catalogClient.loaders.LayerLoader#getErrorMessage()

         */

        protected String getErrorMessage() {

                return Messages.getText("wcsError") + ".\n" +

                Messages.getText("link") + ": " + 

                getResource().getLinkage();                

        }

        /*

         *  (non-Javadoc)

         * @see es.gva.cit.gvsig.catalogClient.loaders.LayerLoader#getWindowMessage()

         */

        protected String getWindowMessage() {

                return Messages.getText("wcsLoad");

        }

}