com.vividsolutions.jts.geom
Class GeometryFactory

java.lang.Object
  com.vividsolutions.jts.geom.GeometryFactory

All Implemented Interfaces:

java.io.Serializable

public class GeometryFactory
extends java.lang.Object
implements java.io.Serializable

Supplies a set of utility methods for building Geometry objects from lists of Coordinates.

Note that the factory constructor methods do not change the input coordinates in any way. In particular, they are not rounded to the supplied PrecisionModel. It is assumed that input Coordinates meet the given precision.

Version:

1.7

See Also:

Serialized Form

Constructor Summary

GeometryFactory()
Constructs a GeometryFactory that generates Geometries having a floating PrecisionModel and a spatial-reference ID of 0.

GeometryFactory(CoordinateSequenceFactory coordinateSequenceFactory)
Constructs a GeometryFactory that generates Geometries having the given CoordinateSequence implementation, a double-precision floating PrecisionModel and a spatial-reference ID of 0.

GeometryFactory(PrecisionModel precisionModel)
Constructs a GeometryFactory that generates Geometries having the given PrecisionModel and the default CoordinateSequence implementation.

GeometryFactory(PrecisionModel precisionModel, int SRID)
Constructs a GeometryFactory that generates Geometries having the given PrecisionModel and spatial-reference ID, and the default CoordinateSequence implementation.

GeometryFactory(PrecisionModel precisionModel, int SRID, CoordinateSequenceFactory coordinateSequenceFactory)
Constructs a GeometryFactory that generates Geometries having the given PrecisionModel, spatial-reference ID, and CoordinateSequence implementation.

Method Summary

Geometry	buildGeometry(java.util.Collection geomList) Build an appropriate Geometry, MultiGeometry, or GeometryCollection to contain the Geometrys in it.
Geometry	createGeometry(Geometry g)
GeometryCollection	createGeometryCollection(Geometry[] geometries) Creates a GeometryCollection using the given Geometries; a null or empty array will create an empty GeometryCollection.
LinearRing	createLinearRing(Coordinate[] coordinates) Creates a LinearRing using the given Coordinates.
LinearRing	createLinearRing(CoordinateSequence coordinates) Creates a LinearRing using the given CoordinateSequence.
LineString	createLineString(Coordinate[] coordinates) Creates a LineString using the given Coordinates; a null or empty array will create an empty LineString.
LineString	createLineString(CoordinateSequence coordinates) Creates a LineString using the given CoordinateSequence; a null or empty CoordinateSequence will create an empty LineString.
MultiLineString	createMultiLineString(LineString[] lineStrings) Creates a MultiLineString using the given LineStrings; a null or empty array will create an empty MultiLineString.
MultiPoint	createMultiPoint(Coordinate[] coordinates) Creates a MultiPoint using the given Coordinates.
MultiPoint	createMultiPoint(CoordinateSequence coordinates) Creates a MultiPoint using the given CoordinateSequence.
MultiPoint	createMultiPoint(Point[] point) Creates a MultiPoint using the given Points.
MultiPolygon	createMultiPolygon(Polygon[] polygons) Creates a MultiPolygon using the given Polygons; a null or empty array will create an empty Polygon.
Point	createPoint(Coordinate coordinate) Creates a Point using the given Coordinate; a null Coordinate will create an empty Geometry.
Point	createPoint(CoordinateSequence coordinates) Creates a Point using the given CoordinateSequence; a null or empty CoordinateSequence will create an empty Point.
static Point	createPointFromInternalCoord(Coordinate coord, Geometry exemplar)
Polygon	createPolygon(LinearRing shell, LinearRing[] holes) Constructs a Polygon with the given exterior boundary and interior boundaries.
CoordinateSequenceFactory	getCoordinateSequenceFactory()
PrecisionModel	getPrecisionModel() Returns the PrecisionModel that Geometries created by this factory will be associated with.
int	getSRID()
Geometry	toGeometry(Envelope envelope) Creates a Geometry with the same extent as the given envelope.
static Geometry[]	toGeometryArray(java.util.Collection geometries) Converts the List to an array.
static LinearRing[]	toLinearRingArray(java.util.Collection linearRings) Converts the List to an array.
static LineString[]	toLineStringArray(java.util.Collection lineStrings) Converts the List to an array.
static MultiLineString[]	toMultiLineStringArray(java.util.Collection multiLineStrings) Converts the List to an array.
static MultiPoint[]	toMultiPointArray(java.util.Collection multiPoints) Converts the List to an array.
static MultiPolygon[]	toMultiPolygonArray(java.util.Collection multiPolygons) Converts the List to an array.
static Point[]	toPointArray(java.util.Collection points) Converts the List to an array.
static Polygon[]	toPolygonArray(java.util.Collection polygons) Converts the List to an array.

Methods inherited from class java.lang.Object

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

Constructor Detail

GeometryFactory

public GeometryFactory(PrecisionModel precisionModel,
                       int SRID,
                       CoordinateSequenceFactory coordinateSequenceFactory)

Constructs a GeometryFactory that generates Geometries having the given PrecisionModel, spatial-reference ID, and CoordinateSequence implementation.

GeometryFactory

public GeometryFactory(CoordinateSequenceFactory coordinateSequenceFactory)

Constructs a GeometryFactory that generates Geometries having the given CoordinateSequence implementation, a double-precision floating PrecisionModel and a spatial-reference ID of 0.

GeometryFactory

public GeometryFactory(PrecisionModel precisionModel)

Constructs a GeometryFactory that generates Geometries having the given PrecisionModel and the default CoordinateSequence implementation.

Parameters:

precisionModel - the PrecisionModel to use

GeometryFactory

public GeometryFactory(PrecisionModel precisionModel,
                       int SRID)

Constructs a GeometryFactory that generates Geometries having the given PrecisionModel and spatial-reference ID, and the default CoordinateSequence implementation.

Parameters:

precisionModel - the PrecisionModel to use

SRID - the SRID to use

GeometryFactory

public GeometryFactory()

Constructs a GeometryFactory that generates Geometries having a floating PrecisionModel and a spatial-reference ID of 0.

Method Detail

createPointFromInternalCoord

public static Point createPointFromInternalCoord(Coordinate coord,
                                                 Geometry exemplar)

toPointArray

public static Point[] toPointArray(java.util.Collection points)

Converts the List to an array.

Parameters:

points - the List of Points to convert

Returns:

the List in array format

toGeometryArray

public static Geometry[] toGeometryArray(java.util.Collection geometries)

Converts the List to an array.

Parameters:

geometries - the list of Geometry's to convert

Returns:

the List in array format

toLinearRingArray

public static LinearRing[] toLinearRingArray(java.util.Collection linearRings)

Converts the List to an array.

Parameters:

linearRings - the List of LinearRings to convert

Returns:

the List in array format

toLineStringArray

public static LineString[] toLineStringArray(java.util.Collection lineStrings)

Converts the List to an array.

Parameters:

lineStrings - the List of LineStrings to convert

Returns:

the List in array format

toPolygonArray

public static Polygon[] toPolygonArray(java.util.Collection polygons)

Converts the List to an array.

Parameters:

polygons - the List of Polygons to convert

Returns:

the List in array format

toMultiPolygonArray

public static MultiPolygon[] toMultiPolygonArray(java.util.Collection multiPolygons)

Converts the List to an array.

Parameters:

multiPolygons - the List of MultiPolygons to convert

Returns:

the List in array format

toMultiLineStringArray

public static MultiLineString[] toMultiLineStringArray(java.util.Collection multiLineStrings)

Converts the List to an array.

Parameters:

multiLineStrings - the List of MultiLineStrings to convert

Returns:

the List in array format

toMultiPointArray

public static MultiPoint[] toMultiPointArray(java.util.Collection multiPoints)

Converts the List to an array.

Parameters:

multiPoints - the List of MultiPoints to convert

Returns:

the List in array format

toGeometry

public Geometry toGeometry(Envelope envelope)

Creates a Geometry with the same extent as the given envelope. The Geometry returned is guaranteed to be valid. To provide this behaviour, the following cases occur:

If the Envelope is:

• null : returns an empty Point
• a point : returns a non-empty Point
• a line : returns a two-point LineString
• a rectangle : returns a Polygon> whose points are (minx, miny), (minx, maxy), (maxx, maxy), (maxx, miny), (minx, miny).

Parameters:

envelope - the Envelope to convert

Returns:

an empty Point (for null Envelopes), a Point (when min x = max x and min y = max y) or a Polygon (in all other cases)

getPrecisionModel

public PrecisionModel getPrecisionModel()

Returns the PrecisionModel that Geometries created by this factory will be associated with.

createPoint

public Point createPoint(Coordinate coordinate)

Creates a Point using the given Coordinate; a null Coordinate will create an empty Geometry.

createPoint

public Point createPoint(CoordinateSequence coordinates)

Creates a Point using the given CoordinateSequence; a null or empty CoordinateSequence will create an empty Point.

createMultiLineString

public MultiLineString createMultiLineString(LineString[] lineStrings)

Creates a MultiLineString using the given LineStrings; a null or empty array will create an empty MultiLineString.

Parameters:

lineStrings - LineStrings, each of which may be empty but not null

createGeometryCollection

public GeometryCollection createGeometryCollection(Geometry[] geometries)

Creates a GeometryCollection using the given Geometries; a null or empty array will create an empty GeometryCollection.

Parameters:

geometries - Geometries, each of which may be empty but not null

createMultiPolygon

public MultiPolygon createMultiPolygon(Polygon[] polygons)

Creates a MultiPolygon using the given Polygons; a null or empty array will create an empty Polygon. The polygons must conform to the assertions specified in the OpenGIS Simple Features Specification for SQL.

Parameters:

polygons - Polygons, each of which may be empty but not null

createLinearRing

public LinearRing createLinearRing(Coordinate[] coordinates)

Creates a LinearRing using the given Coordinates. A null or empty array will create an empty LinearRing. The points must form a closed and simple linestring. Consecutive points must not be equal.

Parameters:

coordinates - an array without null elements, or an empty array, or null

createLinearRing

public LinearRing createLinearRing(CoordinateSequence coordinates)

Creates a LinearRing using the given CoordinateSequence. A null or empty CoordinateSequence will create an empty LinearRing. The points must form a closed and simple linestring. Consecutive points must not be equal.

Parameters:

coordinates - a CoordinateSequence possibly empty, or null

Throws:

java.lang.IllegalArgumentException - if the ring is not closed, or has too few points

createMultiPoint

public MultiPoint createMultiPoint(Point[] point)

Creates a MultiPoint using the given Points. A null or empty array will create an empty MultiPoint.

Parameters:

point - an array of Points (without null elements), or an empty array, or null

Returns:

a MultiPoint object

createMultiPoint

public MultiPoint createMultiPoint(Coordinate[] coordinates)

Creates a MultiPoint using the given Coordinates. A null or empty array will create an empty MultiPoint.

Parameters:

coordinates - an array (without null elements), or an empty array, or null

Returns:

a MultiPoint object

createMultiPoint

public MultiPoint createMultiPoint(CoordinateSequence coordinates)

Creates a MultiPoint using the given CoordinateSequence. A a null or empty CoordinateSequence will create an empty MultiPoint.

Parameters:

coordinates - a CoordinateSequence (possibly empty), or null

Returns:

a MultiPoint object

createPolygon

public Polygon createPolygon(LinearRing shell,
                             LinearRing[] holes)

Constructs a Polygon with the given exterior boundary and interior boundaries.

Parameters:

shell - the outer boundary of the new Polygon, or null or an empty LinearRing if the empty geometry is to be created.

holes - the inner boundaries of the new Polygon, or null or empty LinearRing s if the empty geometry is to be created.

Throws:

java.lang.IllegalArgumentException - if a ring is invalid

buildGeometry

public Geometry buildGeometry(java.util.Collection geomList)

Build an appropriate Geometry, MultiGeometry, or GeometryCollection to contain the Geometrys in it. For example:

• If geomList contains a single Polygon, the Polygon is returned.
• If geomList contains several Polygons, a MultiPolygon is returned.
• If geomList contains some Polygons and some LineStrings, a GeometryCollection is returned.
• If geomList is empty, an empty GeometryCollection is returned

Note that this method does not "flatten" Geometries in the input, and hence if any MultiGeometries are contained in the input a GeometryCollection containing them will be returned.

Parameters:

geomList - the Geometrys to combine

Returns:

a Geometry of the "smallest", "most type-specific" class that can contain the elements of geomList .

createLineString

public LineString createLineString(Coordinate[] coordinates)

Creates a LineString using the given Coordinates; a null or empty array will create an empty LineString. Consecutive points must not be equal.

Parameters:

coordinates - an array without null elements, or an empty array, or null

createLineString

public LineString createLineString(CoordinateSequence coordinates)

Creates a LineString using the given CoordinateSequence; a null or empty CoordinateSequence will create an empty LineString. Consecutive points must not be equal.

Parameters:

coordinates - a CoordinateSequence possibly empty, or null

createGeometry

public Geometry createGeometry(Geometry g)

Returns:

a clone of g based on a CoordinateSequence created by this GeometryFactory's CoordinateSequenceFactory

getSRID

public int getSRID()

getCoordinateSequenceFactory

public CoordinateSequenceFactory getCoordinateSequenceFactory()