code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.locationtech.spatial4j.io.jts;
  
  import java.io.IOException;
  
  import org.locationtech.spatial4j.context.SpatialContextFactory;
  import org.locationtech.spatial4j.context.jts.JtsSpatialContext;
  import org.locationtech.spatial4j.io.PolyshapeWriter;
  import org.locationtech.spatial4j.shape.Shape;
  import org.locationtech.spatial4j.shape.jts.JtsGeometry;
  import org.locationtech.jts.geom.Coordinate;
  import org.locationtech.jts.geom.CoordinateSequence;
  import org.locationtech.jts.geom.Geometry;
  import org.locationtech.jts.geom.GeometryCollection;
  import org.locationtech.jts.geom.LineString;
  import org.locationtech.jts.geom.MultiPoint;
  import org.locationtech.jts.geom.Point;
  import org.locationtech.jts.geom.Polygon;
  
  public class JtsPolyshapeWriter extends PolyshapeWriter {
  
    protected final JtsSpatialContext ctx;
  
    public JtsPolyshapeWriter(JtsSpatialContext ctx, SpatialContextFactory factory) {
      super(ctx, factory);
      this.ctx = ctx;
    }
  
    // --------------------------------------------------------------
    // Write JTS To GeoJSON
    // --------------------------------------------------------------
  
    protected void write(Encoder output, CoordinateSequence coordseq) throws IOException {
  //    int dim = coordseq.getDimension();
  //    if(dim>2) {
  //      throw new IllegalArgumentException("only supports 2d geometry now ("+dim+")");
  //    }
      for (int i = 0; i < coordseq.size(); i++) {
        output.write(coordseq.getOrdinate(i, 0),
                     coordseq.getOrdinate(i, 1));
      }
    }
  
    protected void write(Encoder output, Coordinate[] coord) throws IOException {
      for (int i = 0; i < coord.length; i++) {
        output.write(coord[i].x, coord[i].y);
      }
    }
  
    protected void write(Encoder output, Polygon p) throws IOException {
      output.write(PolyshapeWriter.KEY_POLYGON);
      write(output, p.getExteriorRing().getCoordinateSequence());
      for (int i = 0; i < p.getNumInteriorRing(); i++) {
        output.startRing();
        write(output, p.getInteriorRingN(i).getCoordinateSequence());
      }
    }
  
    public void write(Encoder output, Geometry geom) throws IOException {
      if (geom instanceof Point) {
        Point v = (Point) geom;
        output.write(PolyshapeWriter.KEY_POINT);
        write(output, v.getCoordinateSequence());
      } else if (geom instanceof Polygon) {
        write(output, (Polygon) geom);
      } else if (geom instanceof LineString) {
        LineString v = (LineString) geom;
        output.write(PolyshapeWriter.KEY_LINE);
        write(output, v.getCoordinateSequence());
      } else if (geom instanceof MultiPoint) {
        MultiPoint v = (MultiPoint) geom;
        output.write(PolyshapeWriter.KEY_MULTIPOINT);
        write(output, v.getCoordinates());
      } else if (geom instanceof GeometryCollection) {
        GeometryCollection v = (GeometryCollection) geom;
        for (int i = 0; i < v.getNumGeometries(); i++) {
          if (i > 0) {
            output.seperator();
          }
          write(output, v.getGeometryN(i));
        }
      } else {
        throw new UnsupportedOperationException("unknown: " + geom);
      }
    }
  
    @Override
    public void write(Encoder enc, Shape shape) throws IOException {
      if (shape == null) {
        throw new NullPointerException("Shape can not be null");
      }
      if (shape instanceof JtsGeometry) {
        write(enc, ((JtsGeometry) shape).getGeom());
        return;
      }
      super.write(enc, shape);
    }
  }