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;

    private String namespace = 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");

        namespace = "";

        String geomField = "";

        if ((nodeFeatures != null) && (nodeFeatures.length > 0)){

                if (nodeFeatures[0].getSubnodes().length > 0){

                        String nodeName = nodeFeatures[0].getSubnodes()[0].getName();

                        if (nodeName.split(":").length == 2){

                                namespace = nodeName.split(":")[0] + ":";

                        }

                        geomField = getGeomField(nodeFeatures[0].getSubNode(0),namespace,thesaurus);

                }

        }

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

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

                geomField = "position->gml:Point->gml:coordinates";

                geomType = "Point";

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

        }else{

            return parseWFS(nodeFeatures,thesaurus,namespace + 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++){

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

            String name = "";

            if (nodeName == null){

                if (thesaurusName.getName().split(":").length == 1){

                        thesaurusName.setName(namespace + thesaurusName.getName());

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

                }

            }

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

            String description = name;

            System.out.println(thesaurusName.getName() + "->" + geomField);

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

                            thesaurusName.getName() + "->" + 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(XMLNode node, String prefix, ThesaurusName thesaurus) {

        String geometryFieldName = "";

        XMLNode geometryNode = null;

            if (node == null){

                return null;

        }

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

                if (isGeometry(thesaurus.getFields()[i].getType())){

                        geometryFieldName = thesaurus.getFields()[i].getName();

                }

        }

        for (int i=0 ; i<node.getNumSubNodes() ; i++){

                if (node.getSubNode(i).getName().endsWith(geometryFieldName)){

                        geometryFieldName = node.getSubNode(i).getName();

                        geometryNode = node.getSubNode(i);

                }

        }

        return getGeometryField(geometryNode,geometryNode.getName());

    }

    private String getGeometryField(XMLNode node,String parentNode){

            if (node == null){

                    return "";

            }

            for (int i=0 ; i<node.getNumSubNodes() ; i++){

                    if (node.getSubNode(i).getName().compareTo("gml:coordinates") == 0){

                            return parentNode + "->" + node.getSubNode(i).getName();

                    }else{

                            return parentNode + "->" + getGeometryField(node.getSubNode(i),node.getSubNode(i).getName());

                }

        }

            return node.getName();

    }

    private boolean isGeometry(String tagName){

            if (tagName.compareTo("gml:MultiLineStringPropertyType") == 0){

                    geomType = "MultiLine";

                    return true;

            }else if(tagName.compareTo("gml:LineString") == 0){

                    geomType = "MultiLine";

                    return true;

            }else if(tagName.compareTo("gml:MultiPolygonPropertyType") == 0){

                    geomType = "MultiPolygon";

                    return true;

            }else if(tagName.compareTo("gml:PointPropertyType") == 0){

                    geomType = "Point";

                    return true;

            }else if(tagName.compareTo("gml:GeometryPropertyType") == 0){

                    geomType = "Point";

                    return true;

            }

            return false;

    }

/**

 * 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);

    }

 }