org.openstreetmap.atlas.geography.converters.WkbPolygonConverter Maven / Gradle / Ivy

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package org.openstreetmap.atlas.geography.converters;

import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.io.ParseException;
import org.locationtech.jts.io.WKBReader;
import org.locationtech.jts.io.WKBWriter;
import org.openstreetmap.atlas.exception.CoreException;
import org.openstreetmap.atlas.geography.Polygon;
import org.openstreetmap.atlas.geography.converters.jts.JtsPolygonConverter;
import org.openstreetmap.atlas.utilities.conversion.TwoWayConverter;

/**
 * Convert Polygons to a Well Known Binary (WKB) byte array. Polygons retain only one of first
 * versus last point (which are the same for a closed loop).
 *
 * @author Sid
 * @author cstaylor
 */
public class WkbPolygonConverter implements TwoWayConverter
{
    @Override
    public Polygon backwardConvert(final byte[] wkb)
    {
        org.locationtech.jts.geom.Polygon geometry = null;
        final WKBReader myReader = new WKBReader();
        try
        {
            geometry = (org.locationtech.jts.geom.Polygon) myReader.read(wkb);
        }
        catch (final ParseException | ClassCastException e)
        {
            throw new CoreException("Cannot parse wkb : {}", WKBWriter.toHex(wkb), e);
        }
        return new JtsPolygonConverter().backwardConvert(geometry);
    }

    @Override
    public byte[] convert(final Polygon polygon)
    {
        final Geometry geometry = new JtsPolygonConverter().convert(polygon);
        final byte[] wkb = new WKBWriter().write(geometry);
        return wkb;
    }
}