/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.io.gml2;
import java.io.*;
import javax.xml.parsers.*;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
/**
* Reads a GML2 geometry from an XML fragment into a {@link Geometry}.
* <p>
* An example of the GML2 format handled is:
* <pre>
* <LineString>
* <coordinates>24824.045318333192,38536.15071012041
* 26157.378651666528,37567.42733944659 26666.666,36000.0
* 26157.378651666528,34432.57266055341
* 24824.045318333192,33463.84928987959
* 23175.954681666804,33463.84928987959
* 21842.621348333472,34432.57266055341 21333.333,36000.0
* 21842.621348333472,37567.42733944659
* 23175.954681666808,38536.15071012041 </coordinates>
* </LineString>
* </pre>
*
* The reader ignores namespace prefixes,
* and disables both the validation and namespace options on the <tt>SAXParser</tt>.
* This class requires the presence of a SAX Parser available via the
* {@link javax.xml.parsers.SAXParserFactory#newInstance()}
* method.
* <p>
* A specification of the GML XML format
* can be found at the OGC web site: <a href='http://www.opengeospatial.org/'>http://www.opengeospatial.org/</a>.
* <p>
* It is the caller's responsibility to ensure that the supplied {@link PrecisionModel}
* matches the precision of the incoming data.
* If a lower precision for the data is required, a subsequent
* process must be run on the data to reduce its precision.
* <p>
* To parse and build geometry directly from a SAX stream, see {@link GMLHandler}.
*
* @author David Zwiers, Vivid Solutions.
*
* @see GMLHandler
*/
public class GMLReader
{
/**
* Reads a GML2 Geometry from a <tt>String</tt> into a single {@link Geometry}
*
* If a collection of geometries is found, a {@link GeometryCollection} is returned.
*
* @param gml The GML String to parse
* @param geometryFactory When null, a default will be used.
* @return the resulting JTS Geometry
*
* @throws ParserConfigurationException
* @throws IOException
* @throws SAXException
*
* @see #read(Reader, GeometryFactory)
*/
public Geometry read(String gml, GeometryFactory geometryFactory) throws SAXException, IOException, ParserConfigurationException{
return read(new StringReader(gml),geometryFactory);
}
/**
* Reads a GML2 Geometry from a {@link Reader} into a single {@link Geometry}
*
* If a collection of Geometries is found, a {@link GeometryCollection} is returned.
*
* @param reader The input source
* @param geometryFactory When null, a default will be used.
* @return The resulting JTS Geometry
* @throws SAXException
* @throws IOException
*/
public Geometry read(Reader reader, GeometryFactory geometryFactory) throws SAXException, IOException, ParserConfigurationException{
SAXParserFactory fact = SAXParserFactory.newInstance();
fact.setNamespaceAware(false);
fact.setValidating(false);
SAXParser parser = fact.newSAXParser();
if(geometryFactory == null)
geometryFactory = new GeometryFactory();
GMLHandler gh = new GMLHandler(geometryFactory,null);
parser.parse(new InputSource(reader), (DefaultHandler)gh);
return gh.getGeometry();
}
}