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Mapbox Java Services (GeoJSON support)
package com.mapbox.services.commons.geojson;
import com.google.gson.GsonBuilder;
import com.mapbox.services.commons.geojson.custom.PositionDeserializer;
import com.mapbox.services.commons.geojson.custom.PositionSerializer;
import com.mapbox.services.commons.models.Position;
import java.util.ArrayList;
import java.util.List;
/**
* A Polygon is a type of {@link Geometry}.
*
* @see Official GeoJSON Polygon Specifications
* @since 1.0.0
*/
public class Polygon implements Geometry>> {
private final String type = "Polygon";
private List> coordinates;
/**
* Private constructor.
*
* @param coordinates List of {@link Position} making up the Polygon.
* @since 1.0.0
*/
private Polygon(List> coordinates) {
this.coordinates = coordinates;
}
/**
* Should always be "Polygon".
*
* @return String "Polygon".
* @since 1.0.0
*/
@Override
public String getType() {
return type;
}
/**
* Get the list of {@link Position} making up the Polygon.
*
* @return List of {@link Position}.
* @since 1.0.0
*/
@Override
public List> getCoordinates() {
return coordinates;
}
@Override
public void setCoordinates(List> coordinates) {
this.coordinates = coordinates;
}
/**
* Creates a {@link Polygon} from a list of coordinates.
*
* @param coordinates List of {@link Position} coordinates.
* @return {@link Polygon}.
* @since 1.0.0
*/
public static Polygon fromCoordinates(List> coordinates) {
return new Polygon(coordinates);
}
public static Polygon fromCoordinates(double[][][] coordinates) {
List> converted = new ArrayList<>(coordinates.length);
for (int i = 0; i < coordinates.length; i++) {
List innerList = new ArrayList<>(coordinates[i].length);
for (int j = 0; j < coordinates[i].length; j++) {
innerList.add(Position.fromCoordinates(coordinates[i][j]));
}
converted.add(innerList);
}
return fromCoordinates(converted);
}
/**
* Create a GeoJSON Polygon object from JSON.
*
* @param json String of JSON making up a Polygon.
* @return {@link Polygon} GeoJSON object.
* @since 1.0.0
*/
public static Polygon fromJson(String json) {
GsonBuilder gson = new GsonBuilder();
gson.registerTypeAdapter(Position.class, new PositionDeserializer());
return gson.create().fromJson(json, Polygon.class);
}
/**
* Convert feature into JSON.
*
* @return String containing Polygon JSON.
* @since 1.0.0
*/
@Override
public String toJson() {
GsonBuilder gson = new GsonBuilder();
gson.registerTypeAdapter(Position.class, new PositionSerializer());
return gson.create().toJson(this);
}
}