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Add H2 read/write support for file formats such as ESRI shape file
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/**
 * H2GIS is a library that brings spatial support to the H2 Database Engine
 * .
 *
 * H2GIS is distributed under GPL 3 license. It is produced by CNRS
 * .
 *
 * H2GIS 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * H2GIS. If not, see .
 *
 * For more information, please consult: 
 * or contact directly: info_at_h2gis.org
 */

package org.h2gis.drivers.geojson;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import java.io.IOException;
import java.sql.SQLException;
import org.h2gis.h2spatialapi.DeterministicScalarFunction;

/**
 *
 * @author Erwan Bocher
 */
public class ST_GeomFromGeoJSON extends DeterministicScalarFunction{
    private static JsonFactory jsFactory;
    private static GJGeometryReader reader;

    public ST_GeomFromGeoJSON() {
        addProperty(PROP_REMARKS, "Convert a geojson representation of a geometry to a geometry object.");
    }
    
    @Override
    public String getJavaStaticMethod() {
        return "geomFromGeoJSON";
    }
    
    /**
     * Convert a geojson geometry to geometry.
     *
     * @param geojson
     * @return
     * @throws java.io.IOException
     * @throws java.sql.SQLException
     */
    public static Geometry geomFromGeoJSON(String geojson) throws IOException, SQLException {
        if (geojson == null) {
            return null;
        }
        if (jsFactory == null) {
            jsFactory = new JsonFactory();
            jsFactory.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
            jsFactory.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
            jsFactory.configure(JsonParser.Feature.ALLOW_NON_NUMERIC_NUMBERS, true);
            reader = new GJGeometryReader(new GeometryFactory());
        }
        JsonParser jp = jsFactory.createParser(geojson);
        return reader.parseGeometry(jp);
    }
}