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The OpenTripPlanner multimodal journey planning system

There is a newer version: 2.6.0

package org.opentripplanner.netex.mapping;

import net.opengis.gml._3.AbstractRingPropertyType;
import net.opengis.gml._3.LinearRingType;
import net.opengis.gml._3.PolygonType;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.CoordinateSequence;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.LinearRing;
import org.locationtech.jts.geom.Polygon;
import org.opentripplanner.api.resource.CoordinateArrayListSequence;
import org.opentripplanner.common.geometry.GeometryUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * This maps from the OpenGIS PolygonType to LocationTech geometry.
 */
class OpenGisMapper {

  static Geometry mapGeometry(PolygonType polygonType) {
    return new Polygon(
        new LinearRing(mapCoordinateSequence(polygonType.getExterior()),
            GeometryUtils.getGeometryFactory()
        ),
        polygonType
            .getInterior()
            .stream()
            .map(c -> new LinearRing(mapCoordinateSequence(c), GeometryUtils.getGeometryFactory()))
            .toArray(LinearRing[]::new),
        GeometryUtils.getGeometryFactory()
    );
  }

  private static CoordinateSequence mapCoordinateSequence(
      AbstractRingPropertyType abstractRingPropertyType
  ) {
    List posList = ((LinearRingType) abstractRingPropertyType.getAbstractRing().getValue())
        .getPosList()
        .getValue();

    // Convert a single list of alternating lat/lon values into coordinates
    ArrayList coordinates = new ArrayList<>();
    for (int i = 0; i < posList.size(); i += 2) {
      coordinates.add(new Coordinate(posList.get(i + 1), posList.get(i)));
    }

    return new CoordinateArrayListSequence(coordinates);
  }
}