Application: gvSIG desktop

package org.gvsig.remoteClient.wfs;

import java.io.File;

import java.net.URL;

import java.util.HashMap;

import java.util.Hashtable;

import java.util.Set;

import java.util.Vector;

import org.gvsig.remoteClient.OGCProtocolHandler;

import org.gvsig.remoteClient.utils.Utilities;

/* 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: WFSProtocolHandler.java 5536 2006-05-30 13:58:18Z jaume $

 * $Log$

 * Revision 1.4  2006-05-30 13:58:03  jaume

 * cancelable downloads

 *

 * Revision 1.3  2006/05/23 13:23:13  jorpiell

 * Se ha cambiado el final del bucle de parseado y se tiene en cuenta el online resource

 *

 * Revision 1.2  2006/04/20 16:39:16  jorpiell

 * A?adida la operacion de describeFeatureType y el parser correspondiente.

 *

 * Revision 1.1  2006/04/19 12:51:35  jorpiell

 * A?adidas algunas de las clases del servicio WFS

 *

 *

 */

/**

 * @author Jorge Piera Llodr? (piera_jor@gva.es)

 */

public abstract class WFSProtocolHandler extends OGCProtocolHandler {

        /**

         * Encoding used to parse different xml documents.

         */

        protected String encoding = "UTF-8";

        /**

     * WFS metadata

     */

    protected ServiceInformation serviceInfo = new ServiceInformation();

        protected Hashtable features = new Hashtable();

        protected String currentFeature = null;

        /**

     * <p>Builds a GetCapabilities request that is sent to the WFS

     * the response will be parse to extract the data needed by the

     * WFS client</p>

     */

    public void getCapabilities(WFSStatus status) {

           URL request = null;

            try {

                request = new URL(buildCapabilitiesRequest(status));

            }

            catch(Exception e) {

                e.printStackTrace();

            }

            try {

                    File f = Utilities.downloadFile(request,"wfs_capabilities.xml", null);

                    parseCapabilities(f);

            } catch(Exception e) {

                    e.printStackTrace();

            }

    }

    /**

     * @return

     */

    private String buildCapabilitiesRequest(WFSStatus status) {

            StringBuffer req = new StringBuffer();

                String symbol = null;

                String onlineResource;

                if (status == null || status.getOnlineResource() == null)

                        onlineResource = getHost();

                else 

                        onlineResource = status.getOnlineResource();

                symbol = getSymbol(onlineResource);

                req.append(onlineResource).append(symbol).append("REQUEST=GetCapabilities&SERVICE=WFS&");

                req.append("VERSION=").append(getVersion()).append("&EXCEPTIONS=XML");

                return req.toString();

    }   

    /**

     * Builds the GetCapabilitiesRequest according to the OGC WFS Specifications

     * without a VERSION, to get the highest version than a WFS supports.

     */

    public static String buildCapabilitiesSuitableVersionRequest(String _host, String _version)

    {

                String req = new String();                

        String symbol = getSymbol(_host);

        req = req + _host + symbol + "REQUEST=GetCapabilities&SERVICE=WFS&";                

        if((_version != null) && (_version.length()>0 ))

        {

                req += ("&VERSION=" + _version);

        }

                req += ("&EXCEPTIONS=XML");                

                return req;           

    }

        /**

     * <p>Builds a describeFeatureType request that is sent to the WFS

     * the response will be parse to extract the data needed by the

     * WFS client</p>

     * @param status

         * WFS client status. Contains all the information to create

         * the query. In this case, the only the feature name is needed.

     */

    public void describeFeatureType(WFSStatus status) {

        URL request = null;

        this.currentFeature = status.getFeatureName();

        try {

            request = new URL(buildDescribeFeatureTypeRequest(status));

        }

        catch(Exception e) {

            e.printStackTrace();

        }

        try {

                File f = Utilities.downloadFile(request, "wfs_describeFeatureType.xml", null);

                parseDescribeFeatureType(f);

        } catch(Exception e) {

                e.printStackTrace();

        }

    }     

    private String buildDescribeFeatureTypeRequest(WFSStatus status) {

            StringBuffer req = new StringBuffer();

                String symbol = null;

                String onlineResource;

                if (status == null || status.getOnlineResource() == null)

                        onlineResource = getHost();

                else 

                        onlineResource = status.getOnlineResource();

                symbol = getSymbol(onlineResource);

                req.append(onlineResource).append(symbol).append("REQUEST=DescribeFeatureType&SERVICE=WFS&");

                req.append("TYPENAME=").append(status.getFeatureName()).append("&");

                req.append("VERSION=").append(getVersion()).append("&EXCEPTIONS=XML");

                return req.toString();

    }

    /**

     * parses the data retrieved by the DescribeCoverage XML document

     */

    public abstract boolean parseDescribeFeatureType(File f);

    /**

     * <p>Builds a getFeature request that is sent to the WFS

     * the response will be parse to extract the data needed by the

     * WFS client</p>

     * @param status

         * WFS client status. Contains all the information to create

         * the query. 

         * @return File

         * GML file

     */    

    public File getFeature(WFSStatus status){

            URL request = null;

        try {

            request = new URL(buildGetFeatureRequest(status));

        }

        catch(Exception e) {

            e.printStackTrace();

        }

        try {

                File f = Utilities.downloadFile(request, "wfs_getFeature.xml", null);

                return f;

        } catch(Exception e) {

                e.printStackTrace();

                return null;

        }

    }

        /**

     * <p>Builds a getFeature request that is sent to the WFS

     * the response will be parse to extract the data needed by the

     * WFS client</p>

     * @param status

         * WFS client status. Contains all the information to create

         * the query. 

     */

    private String buildGetFeatureRequest(WFSStatus status){

            StringBuffer req = new StringBuffer();

                String symbol = null;

                String onlineResource;

                if (status == null || status.getOnlineResource() == null)

                        onlineResource = getHost();

                else 

                        onlineResource = status.getOnlineResource();

                symbol = getSymbol(onlineResource);

                req.append(onlineResource).append(symbol).append("REQUEST=GetFeature&SERVICE=WFS&");

                req.append("TYPENAME=").append(status.getFeatureName()).append("&");

                String[] fields = status.getFields();

                if (fields.length > 0){

                        req.append("PROPERTYNAME=");

                        req.append(fields[0]);

                        for (int i=1 ; i<fields.length ; i++){

                                req.append("," + fields[i]);

                        }                

                }                

                req.append("VERSION=").append(getVersion()).append("&EXCEPTIONS=XML");

                return req.toString();

    }    

    /**

     * Just for not repeat code. Gets the correct separator according 

     * to the server URL

     * @param h

     * @return

     */

    private static String getSymbol(String h) {

        String symbol;

        if (h.indexOf("?")==-1) 

            symbol = "?";

        else if (h.indexOf("?")!=h.length()-1)

            symbol = "&";

        else

            symbol = "";

        return symbol;

    }  

    /**

     * Returns the service Information

     * @return

     */

    public ServiceInformation getServiceInformation(){

            return serviceInfo;

    }

    public class ServiceInformation {

        public String online_resource = null;

        public String version;

        public String name;

        public String scope;

        public String title;

        public String abstr;

        public String keywords;

        public String fees;

        public String operationsInfo;

        public String personname;

        public String organization;

        public String function;

        public String addresstype;

        public String address;

        public String place;

        public String province;

        public String postcode;

        public String country;

        public String phone;

        public String fax;

        public String email;

        public Vector formats;

        public HashMap operations; // operations that WFS supports

        public ServiceInformation()

        {          

            version = new String();

            name = new String();

            scope = new String();

            title = new String();

            abstr = new String();

            keywords = new String();

            fees = new String();

            operationsInfo = new String();

            personname = new String();

            organization = new String();

            function = new String();

            addresstype = new String();

            address = new String();

            place = new String();

            province = new String();

            postcode = new String();

            country = new String();

            phone = new String();

            fax = new String();

            email = new String();

            formats = new Vector();               

            operations = new HashMap();            

        }

                /**

                 * @return Returns the online_resource.

                 */

                public String getOnline_resource() {

                        return online_resource;

                }

     }

        /**

         * @return Returns the features.

         */

        public Hashtable getFeatures() {

                return features;

        }

        /**

         * @return Returns the currentFeature.

         */

        public String getCurrentFeature() {

                return currentFeature;

        }

        /**

         * Sets the fields of the current feature

         * @param fields

         */

        public void setFields(Vector fields){

                WFSFeature feature = (WFSFeature) features.get(currentFeature);

                feature.setFields(fields);

                features.put(feature.getName(),feature);                

        }

        /**

         * Sets the fields of the current feature

         * @param fields

         */

        public void setFields(Hashtable fields){

                WFSFeature feature = (WFSFeature) features.get(currentFeature);

                Vector vFields = new Vector();

                Set keys = fields.keySet();

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

                        vFields.add(fields.get(keys.toArray()[i]));

                }

                feature.setFields(vFields);

                features.put(feature.getName(),feature);                

        }

        /**

         * @param currentFeature The currentFeature to set.

         */

        public void setCurrentFeature(String currentFeature) {

                this.currentFeature = currentFeature;

        }   

}