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 es.gva.cit.gvsig.catalogClient.loaders;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.ProtocolException;

import java.net.URL;

import java.util.Vector;

import org.exolab.castor.xml.ValidationException;

import com.iver.cit.gvsig.fmap.drivers.UnsupportedVersionException;

import com.iver.cit.gvsig.fmap.drivers.WMSException;

import com.iver.cit.gvsig.fmap.drivers.wms.FMapWMSDriver;

import com.iver.cit.gvsig.fmap.layers.FLayer;

import com.iver.cit.gvsig.fmap.layers.FLyrWMS;

import com.iver.cit.gvsig.fmap.layers.WMSLayerNode;

import es.gva.cit.catalogClient.schemas.discoverer.Resource;

import es.gva.cit.catalogClient.traductor.ITranslator;

import es.gva.cit.catalogClient.traductor.Translator;

/**

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

 * 

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

 */

public class WMSLayerLoader extends LayerLoader{

    public WMSLayerLoader(Resource resource, ITranslator translator) {

                super(resource, translator);

                //load(getResource().getLinkage(),getResource().getName());

        }

        /**

         * This function loads a WMS resource 

         * @param host

         * URL where the server is located

         * @param sLayer

         * Layer name

         * @param crs

         * Coordenates System

         * @throws LayerLoaderException 

         */

        public void loadLayer() throws LayerLoaderException {

                String host = getResource().getLinkage();

                String sLayer = getResource().getName();

                    FLayer flayer;

                        try {

                                flayer = createWMSLayer(host, sLayer);

                                addLayerToView(flayer);

                        } catch (ProtocolException e) {

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

                        } catch (MalformedURLException e) {

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

                        } catch (IllegalStateException e) {

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

                        } catch (ValidationException e) {

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

                        } catch (WMSException e) {

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

                        } catch (IOException e) {

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

                        } catch (UnsupportedVersionException e) {

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

                        }                                        

        }

        /**

         * It retrieves a getCapabilities file and loads the layer in gvSIG

         * @param host

         * WMS URL

         * @param sLayer

         * Layer Name

         * @return

         * FLayer

         * @throws ServerOutOfOrderException

         * @throws ProtocolException

         * @throws MalformedURLException

         * @throws WMSException

         * @throws IOException

         * @throws UnsupportedVersionException 

         * @throws ValidationException 

         * @throws IllegalStateException 

         * @throws LayerLoaderException 

         */

        private FLayer createWMSLayer(String host, String sLayer) throws ProtocolException, MalformedURLException, WMSException, IOException, IllegalStateException, ValidationException, UnsupportedVersionException, LayerLoaderException {

                FMapWMSDriver drv = new FMapWMSDriver();

                drv.createClient(new URL(host));

                if (!drv.connect())

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

                WMSLayerNode wmsNode = drv.getLayer(sLayer);

                if (wmsNode == null){

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

                }                

                String[] sLayers = sLayer.split(",");

                FLyrWMS flyr = new FLyrWMS();

                flyr.setHost(new URL(host));

                flyr.setFullExtent(drv.getLayersExtent(sLayers,(String)wmsNode.getAllSrs().get(0)));

                flyr.setFormat(getGreatFormat(drv.getFormats()));

                flyr.setLayerQuery(sLayer);

                flyr.setInfoLayerQuery("");

                flyr.setSRS((String)wmsNode.getAllSrs().get(0));

                flyr.setName(sLayer);

                return flyr;

        }

        /**

         * It choose the best format to load different maps if the server 

         * supports it. This format could be png, because it supports 

         * transparency.

         * @param formats

         * Array with all the formats supported by the server

         * @return

         */        

        private String getGreatFormat(Vector formats){

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

                String format = (String) formats.get(i);

                    if (format.equals("image/jpg")){

                    return format;

                    }

                    if (format.equals("image/jpeg")){

                    return format;

                    }

            }

            return (String)formats.get(0);

        }

        private String getErrorMessage() {

                return Translator.getText(getTranslator(),"wmsError") + ".\n" +

                                Translator.getText(getTranslator(),"server") + ": " + 

                                getResource().getLinkage() + "\n" +

                                Translator.getText(getTranslator(),"layer") + ": " +

                                getResource().getName();                

        }

        private String getWindowMessage() {

                return Translator.getText(getTranslator(),"loadWMS");

        }

}