Package org.locationtech.jts.io.geojson

Class GeoJsonReader

java.lang.Object

org.locationtech.jts.io.geojson.GeoJsonReader

public class GeoJsonReader
extends Object

Reads a GeoJson Geometry from a JSON fragment into a Geometry.

A specification of the GeoJson format can be found at the GeoJson web site: http://geojson.org/geojson-spec.html.

It is the caller's responsibility to ensure that the supplied PrecisionModel matches the precision of the incoming data. If a lower precision for the data is required, a subsequent process must be run on the data to reduce its precision.

Field Summary

Fields

Modifier and Type	Field	Description
private GeometryFactory	gf

Constructor Summary

Constructors

Constructor	Description
GeoJsonReader()	The default constructor uses the SRID from the Geojson CRS and the default PrecisionModel to create a GeometryFactory.
GeoJsonReader(GeometryFactory geometryFactory)	This constructor accepts a GeometryFactory that is used to create the output geometries and to override the GeoJson CRS.

Method Summary

Modifier and Type	Method	Description
private Geometry	create(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private CoordinateSequence	createCoordinate(List<Number> ordinates)
private CoordinateSequence	createCoordinateSequence(List<List<Number>> coordinates)
private Geometry	createGeometryCollection(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private Geometry	createLineString(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private Geometry	createMultiLineString(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private Geometry	createMultiPoint(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private Geometry	createMultiPolygon(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private Geometry	createPoint(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private Geometry	createPolygon(Map<String,Object> geometryMap, GeometryFactory geometryFactory)
private GeometryFactory	getGeometryFactory(Map<String,Object> geometryMap)
Geometry	read(Reader reader)	Reads a GeoJson Geometry from a Reader into a single Geometry.
Geometry	read(String json)	Reads a GeoJson Geometry from a String into a single Geometry.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

gf

private GeometryFactory gf

Constructor Details

GeoJsonReader

public GeoJsonReader()

The default constructor uses the SRID from the Geojson CRS and the default PrecisionModel to create a GeometryFactory. If there is no CRS specified then the default CRS is a geographic coordinate reference system, using the WGS84 datum, and with longitude and latitude units of decimal degrees (SRID = 4326)

GeoJsonReader

public GeoJsonReader(GeometryFactory geometryFactory)

This constructor accepts a GeometryFactory that is used to create the output geometries and to override the GeoJson CRS.

Parameters:

geometryFactory - a GeometryFactory

Method Details

read

public Geometry read(String json)
              throws ParseException

Reads a GeoJson Geometry from a String into a single Geometry.

Parameters:

json - The GeoJson String to parse

Returns:

the resulting JTS Geometry

Throws:

ParseException - throws a ParseException if the JSON string cannot be parsed

read

public Geometry read(Reader reader)
              throws ParseException

Reads a GeoJson Geometry from a Reader into a single Geometry.

Parameters:

reader - The input source

Returns:

The resulting JTS Geometry

Throws:

ParseException - throws a ParseException if the JSON string cannot be parsed

create

private Geometry create(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                 throws ParseException

Throws:

ParseException

createGeometryCollection

private Geometry createGeometryCollection(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                                   throws ParseException

Throws:

ParseException

createMultiPolygon

private Geometry createMultiPolygon(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                             throws ParseException

Throws:

ParseException

createMultiLineString

private Geometry createMultiLineString(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                                throws ParseException

Throws:

ParseException

createMultiPoint

private Geometry createMultiPoint(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                           throws ParseException

Throws:

ParseException

createPolygon

private Geometry createPolygon(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                        throws ParseException

Throws:

ParseException

createLineString

private Geometry createLineString(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                           throws ParseException

Throws:

ParseException

createPoint

private Geometry createPoint(Map<String,Object> geometryMap,
 GeometryFactory geometryFactory)
                      throws ParseException

Throws:

ParseException

getGeometryFactory

private GeometryFactory getGeometryFactory(Map<String,Object> geometryMap)
                                    throws ParseException

Throws:

ParseException

createCoordinateSequence

private CoordinateSequence createCoordinateSequence(List<List<Number>> coordinates)

createCoordinate

private CoordinateSequence createCoordinate(List<Number> ordinates)