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.gazetteer.wfs.drivers;

import java.io.File;

import java.net.MalformedURLException;

import java.net.URI;

import java.util.ArrayList;

import java.util.Hashtable;

import java.util.Iterator;

import java.util.Vector;

import org.gvsig.remoteClient.gml.GMLReader;

import org.gvsig.remoteClient.gml.IGMLFeaturesIterator;

import org.gvsig.remoteClient.gml.exceptions.GMLException;

import org.gvsig.remoteClient.gml.schemas.XMLElement;

import org.gvsig.remoteClient.gml.types.XMLComplexType;

import org.gvsig.remoteClient.wfs.WFSClient;

import org.gvsig.remoteClient.wfs.WFSFeature;

import org.gvsig.remoteClient.wfs.WFSStatus;

import org.gvsig.remoteClient.wfs.filters.FilterEncoding;

import com.iver.utiles.swing.jcomboServer.ServerData;

import es.gva.cit.catalog.drivers.DiscoveryServiceCapabilities;

import es.gva.cit.catalog.utils.CatalogConstants;

import es.gva.cit.gazetteer.drivers.AbstractGazetteerServiceDriver;

import es.gva.cit.gazetteer.drivers.GazetteerCapabilities;

import es.gva.cit.gazetteer.querys.Feature;

import es.gva.cit.gazetteer.querys.FeatureType;

import es.gva.cit.gazetteer.querys.FeatureTypeAttribute;

import es.gva.cit.gazetteer.querys.GazetteerQuery;

import es.gva.cit.gazetteer.utils.GazetteerFormatter;

import es.gva.cit.gazetteer.utils.GazetteerGeometriesFactory;

/**

 * Driver for the WFS protocol

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

 */

public class WFSServiceDriver extends AbstractGazetteerServiceDriver {

        protected WFSClient client = null;

        protected WFSStatus status = null;

        /*

         * (non-Javadoc)

         * @see es.gva.cit.catalogClient.drivers.IDiscoveryServiceDriver#getCapabilities(java.net.URI)

         */

        public DiscoveryServiceCapabilities getCapabilities(URI uri) {

                GazetteerCapabilities capabilities = new GazetteerCapabilities();

                String sURL = null;

                try {

                        sURL = uri.toURL().toString();

                } catch (MalformedURLException e) {

                        setServerAnswerReady("errorServerNotFound");

                        return null;

                }

                status = new WFSStatus(sURL);

                try {

                        client = new WFSClient(sURL);

                        client.getCapabilities(status, true, null);

                } catch (Exception e) {

                        capabilities.setServerMessage(e.toString());

                        return capabilities;

                }

                setServerAnswerReady(client.getServiceInformation().name);

                Hashtable features = client.getFeatures();

                setFeatureTypes(convertFeatureNames(features));

                capabilities.setServerMessage(client.getServiceInformation().name +

                                client.getServiceInformation().abstr);

                capabilities.setFeatureTypes(getFeatureTypes());

                return capabilities;

        }

        /**

         * Convert the features from the remote services format to

         * the gazetteer format

         * @param features

         * @return

         */

        private FeatureType[] convertFeatureNames(Hashtable features) {

                Iterator it = features.keySet().iterator();

                FeatureType[] featureTypes = new FeatureType[features.size()];

                int i = 0;

                while (it.hasNext()){

                        String featureName = (String)it.next();

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

                        featureTypes[i] = new FeatureType(featureName);

                        featureTypes[i].setTitle(feature.getTitle());

                        i++;

                }

                return featureTypes;

        }

        /*

         * (non-Javadoc)

         * @see es.gva.cit.gazetteer.drivers.IGazetteerServiceDriver#describeFeatureType(java.net.URI, java.lang.String)

         */

        public FeatureTypeAttribute[] describeFeatureType(URI uri, String feature) {

                status.setFeatureName(feature);

                try{

                        client.describeFeatureType(status, false, null);

                }catch (Exception e){

                        //Impossible to retrieve the attributes

                        return new FeatureTypeAttribute[0];

                }

                WFSFeature wfsFeature = (WFSFeature)client.getFeatures().get(feature);

                if ((wfsFeature.getSrs() != null) && (wfsFeature.getSrs().size() > 0)){

                        this.setProjection((String)wfsFeature.getSrs().get(0));

                }

                return covertFeatuteAttributes(wfsFeature);

        }

        /*

         * (non-Javadoc)

         * @see es.gva.cit.gazetteer.drivers.AsbtractGazetteerServiceDriver#isDescribeFeatureTypeNeeded()

         */

        public boolean isDescribeFeatureTypeNeeded(){

                return true;

        }

        /**

         * Convert the feature attributes

         * @param feature

         * a Remote clients feature

         * @return

         * A list of attributes

         */

        private FeatureTypeAttribute[] covertFeatuteAttributes(WFSFeature feature) {

                XMLElement element = (XMLElement)feature.getFields().get(0);

                XMLComplexType type = (XMLComplexType)element.getEntityType();

                Vector fields = type.getAttributes();

                FeatureTypeAttribute[] attributes = new FeatureTypeAttribute[fields.size()];

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

                        XMLElement child = (XMLElement)fields.get(i);

                        attributes[i] = new FeatureTypeAttribute(child.getName(),0,false,child.getEntityType().getName());

                }

                return attributes;

        }

        /*

         * (non-Javadoc)

         * @see es.gva.cit.gazetteer.drivers.IGazetteerServiceDriver#getFeature(java.net.URI, es.gva.cit.gazetteer.querys.Query)

         */

        public Feature[] getFeature(URI uri, GazetteerQuery query) throws GMLException {

                //Set the filter

                String sQuery = getFilterSQL(query);

                if (sQuery != null){

                        status.setFilterQuery(sQuery);

                }

                status.setFields(new String[0]);

                try{

                        File file = client.getFeature(status, false, null);

                        return parseOutputFile(file,query.getFieldAttribute());

                }catch(Exception e){

                        return new Feature[0];

                }

        }

        /**

         * Parses the GML file

         * @param file

         * @return

         * @throws GMLException

         */

        protected Feature[] parseOutputFile(File file, String fieldAttribute) throws GMLException{

                GMLReader reader = new GMLReader(file,new GazetteerGeometriesFactory(fieldAttribute));

                IGMLFeaturesIterator it = reader.getFeaturesIterator();

                ArrayList features = new ArrayList();

                while (it.hasNext()){

                        Object feature = it.next();

                        if (feature != null){

                                features.add(feature);

                        }

                }

                Feature[] auxFeatures = new Feature[features.size()];

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

                        auxFeatures[i] = (Feature)features.get(i);

                }

                return auxFeatures;

        }

        /**

         * Creates a SQL filter to do the search

         * @return

         * A standard SQL query

         */

        protected String getFilterSQL(GazetteerQuery query){

                StringBuffer buffer = new StringBuffer();

                if ((query.getName() == null) || (query.getName().equals(""))){

                        return null;

                }

                if (query.getNameFilter().equals(CatalogConstants.EXACT_WORDS)){

                        buffer.append("(" + query.getFieldAttribute() + " = " + query.getName() + ")");

                }else{

                        String conector = null;

                        if (query.getNameFilter().equals(CatalogConstants.ALL_WORDS)){

                                conector = "AND";

                        }else if (query.getNameFilter().equals(CatalogConstants.ANY_WORD)){

                                conector = "OR";

                        }

                        String[] words = query.getName().split(" ");

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

                                buffer.append("(" + query.getFieldAttribute() + " = " + words[i] + ")");

                                if (i  < words.length - 1){

                                        buffer.append(" " + conector + " ");

                                }

                        }

                }

                FilterEncoding fe = GazetteerFormatter.createFilter();

                fe.setQuery(buffer.toString());

                return fe.toString();

        }

        /*

         * (non-Javadoc)

         * @see es.gva.cit.gazetteer.drivers.IGazetteerServiceDriver#isProtocolSupported(java.net.URI)

         */

        public boolean isProtocolSupported(URI uri) {

                return true;

        }

        /*

         * (non-Javadoc)

         * @see es.gva.cit.gazetteer.drivers.IGazetteerServiceDriver#getDefaultPort()

         */

        public int getDefaultPort() {

                return 80;

        }

        /*

         * (non-Javadoc)

         * @see es.gva.cit.gazetteer.drivers.IGazetteerServiceDriver#getDefaultSchema()

         */

        public String getDefaultSchema() {

                return "http";

        }

        /*

         * (non-Javadoc)

         * @see es.gva.cit.gazetteer.drivers.IGazetteerServiceDriver#getServiceName()

         */

        public String getServiceName() {

                return ServerData.SERVER_SUBTYPE_GAZETTEER_WFS;

        }

}