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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.shp;

import org.h2.command.Parser;
import org.h2.command.ddl.CreateTableData;
import org.h2.table.Column;
import org.h2.value.Value;
import org.h2gis.drivers.dbf.DBFEngine;
import org.h2gis.drivers.file_table.FileEngine;
import org.h2gis.drivers.shp.internal.SHPDriver;
import org.h2gis.drivers.shp.internal.ShapeType;
import org.h2gis.utilities.GeometryTypeCodes;

import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * SHP Table factory.
 * @author Nicolas Fortin
 */
public class SHPEngine extends FileEngine {

    @Override
    protected SHPDriver createDriver(File filePath, List args) throws IOException {
        SHPDriver driver = new SHPDriver();
        driver.initDriverFromFile(filePath, args.size() > 1 ? args.get(1) : null);
        return driver;
    }

    private static int getGeometryTypeCodeFromShapeType(ShapeType shapeType) {
        if(shapeType.isPointType()) {
            return GeometryTypeCodes.MULTIPOINT;
        } else if(shapeType.isLineType()) {
            return GeometryTypeCodes.MULTILINESTRING;
        } else {
            return GeometryTypeCodes.MULTIPOLYGON;
        }
    }

    @Override
    protected void feedCreateTableData(SHPDriver driver, CreateTableData data) throws IOException {
        Column geometryColumn = new Column("THE_GEOM", Value.GEOMETRY);
        Parser parser = new Parser(data.session);
        geometryColumn.addCheckConstraint(data.session,
                parser.parseExpression("ST_GeometryTypeCode(THE_GEOM) = "+getGeometryTypeCodeFromShapeType(driver.getShapeFileHeader().getShapeType())));
        data.columns.add(geometryColumn);
        DBFEngine.feedTableDataFromHeader(driver.getDbaseFileHeader(), data);
    }
}