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.wfsg.parsers;

import es.gva.cit.catalogClient.metadataXML.XMLNode;

import es.gva.cit.catalogClient.metadataXML.XMLTree;

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

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

import java.awt.geom.Point2D;

/**

 * This class is used to parse the getFeature request

 * 

 * 

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

 */

public class WfsgFeatureParser {

/**

 * 

 * 

 */

    private String geomType = null;

/**

 * It parses the answer

 * 

 * 

 * @return Array of features

 * @param node XML tree that contains the getFeature Answer

 * @param thesaurus FEature selected in the thesaurus list

 * @param attribute Attribute to do the search

 */

    public Feature[] parse(XMLNode node, ThesaurusName thesaurus, String attribute) {        

        XMLNode[] nodeFeatures = XMLTree.searchMultipleNode(node,"gml:featureMember");

       String prefix = thesaurus.getName().split(":")[0];

          String geomField = getGeomField(prefix,thesaurus);

        if ((node.getName().equals("ResultCollection")) ||

                (node.getName().equals("feature_collection"))){

            return parseWFS(nodeFeatures,thesaurus,"geographicIdentifier",geomField);

        }else{

            return parseWFS(nodeFeatures,thesaurus,prefix + ":" + attribute,geomField);

        }  

    } 

/**

 * It parses the a WFS answer

 * 

 * 

 * @return Array of features

 * @param nodeFeatures XML tree that contains the Features

 * @param thesaurusName FEature selected in the thesaurus list

 * @param attribute Attribute to do the search

 * @param geomField Field that contains the geometry

 */

    public Feature[] parseWFS(XMLNode[] nodeFeatures, ThesaurusName thesaurusName, String attribute, String geomField) {        

        Feature[] features = new Feature[nodeFeatures.length];

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

            String id = XMLTree.searchNodeAtribute(nodeFeatures[i],thesaurusName.getName(),"fid");

            XMLNode nodeName = XMLTree.searchNode(nodeFeatures[i],thesaurusName.getName() + "->" + attribute);

            String name = "";

            if (nodeName != null){

                if ((nodeName.getText() != null) && (!(nodeName.getText().equals("")))){

                    name = nodeName.getText();

                } else if ((nodeName.getCdata() != null) && (!(nodeName.getCdata().equals("")))){

                    name = nodeName.getCdata();                   

                }

            }           

            String description = name;

            Point2D point = getCoordinates(XMLTree.searchNodeValue(nodeFeatures[i],

                    geomField));

            features[i] = new Feature(id,name,description,point);

        }

        return features;

    } 

//cv300:entity:layer:level:elevation:color:text:clave:the_geom->gml:MultiLineString->gml:lineStringMember->gml:LineString->gml:coordinates

/**

 * If returns the Geom route of the XML tree

 * 

 * 

 * @return 

 * @param prefix Typename

 * @param thesaurus Feature selected in the thesaurus list

 */

    private String getGeomField(String prefix, ThesaurusName thesaurus) {        

        if ((thesaurus.getFields() == null) || (thesaurus.getFields().length == 0)){

            geomType = "Point";  

            return thesaurus.getName() + "->" + "position->gml:Point->gml:coordinates";

        }    

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

            if (thesaurus.getFields()[i].getType().equals("gml:MultiLineStringPropertyType")){

                prefix = thesaurus.getName() + "->" + prefix + ":" + thesaurus.getFields()[i].getName();

                geomType = "MultiLine";

                return prefix +

                "->gml:MultiLineString->gml:lineStringMember->gml:LineString->" +

                "gml:coordinates";

            }

            if (thesaurus.getFields()[i].getType().equals("gml:MultiPolygonPropertyType")){

                prefix = thesaurus.getName() + "->" + prefix + ":" + thesaurus.getFields()[i].getName();

                geomType = "MultiPolygon";

                return prefix +

                "->gml:MultiPolygon->gml:polygonMember->gml:Polygon->gml:outerBoundaryIs->" +

                "gml:LinearRing->gml:coordinates";

            }

            if (thesaurus.getFields()[i].getType().equals("gml:PointPropertyType")){

                prefix = thesaurus.getName() + "->" + prefix + ":" + thesaurus.getFields()[i].getName();

                geomType = "Point";

                return prefix +

                "->gml:Point->gml:coordinates";

            }           

        }        

      return "";

    } 

/**

 * It returns a pair of coordinates of the Feature

 * 

 * 

 * @return 

 * @param sCoordinates String that contains the coordinates

 */

    private Point2D getCoordinates(String sCoordinates) {        

        if (geomType.equals("MultiLine")){

            return getCoordinatesMultiline(sCoordinates);

        }

        if (geomType.equals("MultiPolygon")){

            return getCoordinatesMultiPolygon(sCoordinates);

        }

        if (geomType.equals("Point")){

            return getCoordinatesPoint(sCoordinates);

        }

        return null;

    } 

/**

 * It returns a pair of coordinates from a Multiline string

 * 

 * 

 * @return 

 * @param sCoordinates String

 */

    private java.awt.geom.Point2D.Double getCoordinatesMultiline(String sCoordinates) {        

        return getAverage(sCoordinates.split(" "));      

    } 

/**

 * It returns a pair of coordinates from a MultiPolygon string

 * 

 * 

 * @return 

 * @param sCoordinates String

 */

    private java.awt.geom.Point2D.Double getCoordinatesMultiPolygon(String sCoordinates) {        

         return getAverage(sCoordinates.split(" "));

    } 

/**

 * It returns a pair of coordinates from a Point

 * 

 * 

 * @return 

 * @param sCoordinates String

 */

    private java.awt.geom.Point2D.Double getCoordinatesPoint(String sCoordinates) {        

          return getAverage(sCoordinates.split(" "));

    } 

/**

 * It returns the average of a set of coordinates

 * 

 * 

 * @return Average

 * @param sCoordinates Coordinates: X,Y

 */

    private java.awt.geom.Point2D.Double getAverage(String[] sCoordinates) {        

         double x =         0.0;

         double y =         0.0;

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

             x = x + Double.parseDouble(sCoordinates[i].split(",")[0]);

             y = y + Double.parseDouble(sCoordinates[i].split(",")[1]);

         }

         x = x / sCoordinates.length;

         y = y / sCoordinates.length;

         return new Point2D.Double(x,y);

    } 

 }