ParserWMS1_3.java

/**
 * OrbisGIS is a java GIS application dedicated to research in GIScience.
 * OrbisGIS is developed by the GIS group of the DECIDE team of the 
 * Lab-STICC CNRS laboratory, see <http://www.lab-sticc.fr/>.
 *
 * The GIS group of the DECIDE team is located at :
 *
 * Laboratoire Lab-STICC – CNRS UMR 6285
 * Equipe DECIDE
 * UNIVERSITÉ DE BRETAGNE-SUD
 * Institut Universitaire de Technologie de Vannes
 * 8, Rue Montaigne - BP 561 56017 Vannes Cedex
 * 
 * OrbisGIS is distributed under GPL 3 license.
 *
 * Copyright (C) 2007-2014 CNRS (IRSTV FR CNRS 2488)
 * Copyright (C) 2015-2017 CNRS (Lab-STICC UMR CNRS 6285)
 *
 * This file is part of OrbisGIS.
 *
 * OrbisGIS 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 3 of the License, or (at your option) any later
 * version.
 *
 * OrbisGIS 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
 * OrbisGIS. If not, see <http://www.gnu.org/licenses/>.
 *
 * For more information, please consult: <http://www.orbisgis.org/>
 * or contact directly:
 * info_at_ orbisgis.org
 */

// Changed by Uwe Dalluege, uwe.dalluege@rzcn.haw-hamburg.de
// to differ between LatLonBoundingBox and BoundingBox
// 2005-08-09

package com.vividsolutions.wms;

import java.io.IOException;
import java.util.LinkedList;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import com.vividsolutions.wms.util.XMLTools;


/**
 * Pulls WMS objects out of the XML
 * @author Chris Hodgson chodgson@refractions.net
 * @author Michael Michaud michael.michaud@free.fr
 */
public class ParserWMS1_3 extends AbstractParser {
    
    
   /** 
    * Creates a Parser for dealing with WMS XML.
    */
    public ParserWMS1_3() {}
    
    
    @Override
    protected String getRootPath() {
        return "WMS_Capabilities";
    }
    
    
    @Override
    public Capabilities parseCapabilities(WMService service, Document doc) throws IOException {
        String title = getTitle(doc);
        MapLayer topLayer = wmsLayerFromNode(XMLTools.simpleXPath(doc, "WMS_Capabilities/Capability/Layer"));
        LinkedList<String> formatList = getFormatList(doc);
        String getMapURL = getMapURL(doc);
        String getFeatureInfoURL = getFeatureInfoURL(doc);
        return new Capabilities(service, title, topLayer, formatList, getMapURL, getFeatureInfoURL );
    }
    
    
    // get the supported file formats
    protected LinkedList<String> getFormatList(Document doc) throws IOException {
        
        LinkedList<String> formatList = new LinkedList<String>();
        final Node formatNode = XMLTools.simpleXPath(doc, "WMS_Capabilities/Capability/Request/GetMap");
        NodeList nl = formatNode.getChildNodes();
        for( int i=0; i < nl.getLength(); i++ ) {
            Node n = nl.item( i );
            if(n.getNodeType() == Node.ELEMENT_NODE && "Format".equals(n.getNodeName())) {
                String format = n.getFirstChild().getNodeValue();
                if (format.matches("^image/(png|jpeg|gif).*")) {
                    formatList.add(format);
                }
            }
        }
        return formatList;
    }
    
    // From WMS 1.1.x
    protected String getMapURL(Document doc) {
        final Node getMapNode = XMLTools.simpleXPath(doc, "WMS_Capabilities/Capability/Request/GetMap");
        String xp = "DCPType/HTTP/Get/OnlineResource";
        String xlink = "http://www.w3.org/1999/xlink";
        Element e = (Element) XMLTools.simpleXPath(getMapNode, xp);
        return e.getAttributeNS(xlink, "href");
    }
    
    
    // From WMS 1.1.x
    protected String getFeatureInfoURL(Document doc) {
        String xp = "WMS_Capabilities/Capability/Request/GetFeatureInfo/DCPType/HTTP/Get/OnlineResource";
        String xlink = "http://www.w3.org/1999/xlink";
        Element e = (Element) XMLTools.simpleXPath(doc, xp);
        return e == null ? "" : e.getAttributeNS(xlink, "href");
    }
    
    protected BoundingBox boundingBoxFromNode(Node n) throws Exception {
        try {
            NamedNodeMap nm = n.getAttributes();           
            String srs = "";
            srs = nm.getNamedItem(getSRSName()).getNodeValue();
            AxisOrder order = AxisOrder.getAxisOrder(srs.toUpperCase());
            if (order == AxisOrder.LATLON) {
                double miny = getCoord("minx", nm);
			    double minx = getCoord("miny", nm);
			    double maxy = getCoord("maxx", nm);
			    double maxx = getCoord("maxy", nm);
			    return new BoundingBox(srs, minx, miny, maxx, maxy);
			}
			else {
                double minx = getCoord("minx", nm);
			    double miny = getCoord("miny", nm);
			    double maxx = getCoord("maxx", nm);
			    double maxy = getCoord("maxy", nm);
			    return new BoundingBox(srs, minx, miny, maxx, maxy);
			}
        } catch( Exception e ) {
            // possible NullPointerException from getNamedItem returning a null
            // also possible NumberFormatException
            e.printStackTrace();
            throw new Exception("Invalid bounding box element node: " + e.toString() );
        }   
    }

    
    protected String getSRSName() {
        return "CRS";
    }
  
}