/**
* H2GIS is a library that brings spatial support to the H2 Database Engine
* <http://www.h2database.com>. H2GIS is developed by CNRS
* <http://www.cnrs.fr/>.
*
* This code is part of the H2GIS project. H2GIS 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;
* version 3.0 of the License.
*
* H2GIS 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 <http://www.gnu.org/licenses/>.
*
*
* For more information, please consult: <http://www.h2gis.org/>
* or contact directly: info_at_h2gis.org
*/
package org.h2gis.functions.spatial.convert;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKBReader;
import org.h2gis.api.DeterministicScalarFunction;
import org.h2gis.utilities.GeometryTypeCodes;
import org.h2gis.utilities.jts_utils.GeometryMetaData;
import java.io.IOException;
import java.sql.SQLException;
/**
* Convert Well Known Binary into a LINESTRING.
* @author Nicolas Fortin
*/
public class ST_LineFromWKB extends DeterministicScalarFunction {
/**
* Default constructor
*/
public ST_LineFromWKB() {
addProperty(PROP_REMARKS, "Convert Well Known Binary into a LINESTRING.\n If an SRID is not specified, it defaults to 0.");
}
@Override
public String getJavaStaticMethod() {
return "toLineString";
}
/**
* Convert WKT into a LinearRing
* @param bytes Byte array
* @return LineString instance of null if bytes null
* @throws SQLException WKB Parse error
* @throws java.io.IOException
*/
public static Geometry toLineString(byte[] bytes) throws SQLException, IOException {
return toLineString(bytes, 0);
}
/**
* Convert WKT into a LinearRing
* @param bytes Byte array
* @param srid SRID
* @return LineString instance of null if bytes null
* @throws SQLException WKB Parse error
* @throws java.io.IOException
*/
public static Geometry toLineString(byte[] bytes, int srid) throws SQLException, IOException {
if(bytes==null) {
return null;
}
WKBReader wkbReader = new WKBReader();
try {
if(GeometryMetaData.getMetaDataFromWKB(bytes).geometryType != GeometryTypeCodes.LINESTRING) {
throw new SQLException("Provided WKB is not a LINESTRING.");
}
Geometry geometry = wkbReader.read(bytes);
geometry.setSRID(srid);
return geometry;
} catch (ParseException ex) {
throw new SQLException("ParseException while evaluating ST_LineFromWKB",ex);
}
}
}