com.mapbox.geojson.MultiPoint Maven / Gradle / Ivy
package com.mapbox.geojson;
import androidx.annotation.Keep;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import com.mapbox.geojson.gson.GeoJsonAdapterFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* A MultiPoint represents two or more geographic points that share a relationship and is one of the
* seven geometries found in the GeoJson spec. This adheres to the RFC 7946 internet standard
* when serialized into JSON. When deserialized, this class becomes an immutable object which should
* be initiated using its static factory methods. The list of points must be equal to or greater
* than 2.
A sample GeoJson MultiPoint's provided below (in it's serialized state).
*
* {
* "TYPE": "MultiPoint",
* "coordinates": [
* [100.0, 0.0],
* [101.0, 1.0]
* ]
* }
*
* Look over the {@link Point} documentation to get more
* information about formatting your list of point objects correctly.
*
* @since 1.0.0
*/
@Keep
public final class MultiPoint implements CoordinateContainer> {
private static final String TYPE = "MultiPoint";
private final String type;
private final BoundingBox bbox;
private final List coordinates;
/**
* Create a new instance of this class by passing in a formatted valid JSON String. If you are
* creating a MultiPoint object from scratch it is better to use one of the other provided static
* factory methods such as {@link #fromLngLats(List)}. For a valid MultiPoint to exist, it must
* have at least 2 coordinate entries.
*
* @param json a formatted valid JSON string defining a GeoJson MultiPoint
* @return a new instance of this class defined by the values passed inside this static factory
* method
* @since 1.0.0
*/
public static MultiPoint fromJson(@NonNull String json) {
GsonBuilder gson = new GsonBuilder();
gson.registerTypeAdapterFactory(GeoJsonAdapterFactory.create());
return gson.create().fromJson(json, MultiPoint.class);
}
/**
* Create a new instance of this class by defining a list of {@link Point}s which follow the
* correct specifications described in the Point documentation. Note that there should not be any
* duplicate points inside the list. Note that if less than 2 points are passed in, a runtime
* exception will occur.
*
* @param points a list of {@link Point}s which make up the LineString geometry
* @return a new instance of this class defined by the values passed inside this static factory
* method
* @since 3.0.0
*/
public static MultiPoint fromLngLats(@NonNull List points) {
return new MultiPoint(TYPE, null, points);
}
/**
* Create a new instance of this class by defining a list of {@link Point}s which follow the
* correct specifications described in the Point documentation. Note that there should not be any
* duplicate points inside the list. Note that if less than 2 points are passed in, a runtime
* exception will occur.
*
* @param points a list of {@link Point}s which make up the LineString geometry
* @param bbox optionally include a bbox definition as a double array
* @return a new instance of this class defined by the values passed inside this static factory
* method
* @since 3.0.0
*/
public static MultiPoint fromLngLats(@NonNull List points, @Nullable BoundingBox bbox) {
return new MultiPoint(TYPE, bbox, points);
}
static MultiPoint fromLngLats(@NonNull double[][] coordinates) {
ArrayList converted = new ArrayList<>(coordinates.length);
for (int i = 0; i < coordinates.length; i++) {
converted.add(Point.fromLngLat(coordinates[i]));
}
return new MultiPoint(TYPE, null, converted);
}
MultiPoint(String type, @Nullable BoundingBox bbox, List coordinates) {
if (type == null) {
throw new NullPointerException("Null type");
}
this.type = type;
this.bbox = bbox;
if (coordinates == null) {
throw new NullPointerException("Null coordinates");
}
this.coordinates = coordinates;
}
/**
* This describes the TYPE of GeoJson this object is, thus this will always return {@link
* MultiPoint}.
*
* @return a String which describes the TYPE of geometry, for this object it will always return
* {@code MultiPoint}
* @since 1.0.0
*/
@NonNull
@Override
public String type() {
return type;
}
/**
* A Feature Collection might have a member named {@code bbox} to include information on the
* coordinate range for it's {@link Feature}s. The value of the bbox member MUST be a list of size
* 2*n where n is the number of dimensions represented in the contained feature geometries, with
* all axes of the most southwesterly point followed by all axes of the more northeasterly point.
* The axes order of a bbox follows the axes order of geometries.
*
* @return a list of double coordinate values describing a bounding box
* @since 3.0.0
*/
@Nullable
@Override
public BoundingBox bbox() {
return bbox;
}
/**
* provides the list of {@link Point}s that make up the MultiPoint geometry.
*
* @return a list of points
* @since 3.0.0
*/
@NonNull
@Override
public List coordinates() {
return coordinates;
}
/**
* This takes the currently defined values found inside this instance and converts it to a GeoJson
* string.
*
* @return a JSON string which represents this MultiPoint geometry
* @since 1.0.0
*/
@Override
public String toJson() {
GsonBuilder gson = new GsonBuilder();
gson.registerTypeAdapterFactory(GeoJsonAdapterFactory.create());
return gson.create().toJson(this);
}
/**
* Gson TYPE adapter for parsing Gson to this class.
*
* @param gson the built {@link Gson} object
* @return the TYPE adapter for this class
* @since 3.0.0
*/
public static TypeAdapter typeAdapter(Gson gson) {
return new MultiPoint.GsonTypeAdapter(gson);
}
@Override
public String toString() {
return "MultiPoint{"
+ "type=" + type + ", "
+ "bbox=" + bbox + ", "
+ "coordinates=" + coordinates
+ "}";
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof MultiPoint) {
MultiPoint that = (MultiPoint) obj;
return (this.type.equals(that.type()))
&& ((this.bbox == null) ? (that.bbox() == null) : this.bbox.equals(that.bbox()))
&& (this.coordinates.equals(that.coordinates()));
}
return false;
}
@Override
public int hashCode() {
int hashCode = 1;
hashCode *= 1000003;
hashCode ^= type.hashCode();
hashCode *= 1000003;
hashCode ^= (bbox == null) ? 0 : bbox.hashCode();
hashCode *= 1000003;
hashCode ^= coordinates.hashCode();
return hashCode;
}
/**
* TypeAdapter for MultiPoint geometry.
*
* @since 4.6.0
*/
static final class GsonTypeAdapter extends BaseGeometryTypeAdapter> {
GsonTypeAdapter(Gson gson) {
super(gson, new ListOfPointCoordinatesTypeAdapter());
}
@Override
public void write(JsonWriter jsonWriter, MultiPoint object) throws IOException {
writeCoordinateContainer(jsonWriter, object);
}
@Override
public MultiPoint read(JsonReader jsonReader) throws IOException {
return (MultiPoint) readCoordinateContainer(jsonReader);
}
@Override
CoordinateContainer> createCoordinateContainer(String type,
BoundingBox bbox,
List coordinates) {
return new MultiPoint(type == null ? "MultiPoint" : type, bbox, coordinates);
}
}
}