org.deegree.geometry.standard
Class AbstractDefaultGeometry

java.lang.Object
  org.deegree.geometry.standard.AbstractDefaultGeometry

All Implemented Interfaces:

Geometry, GMLObject

Direct Known Subclasses:

DefaultCompositeCurve, DefaultCompositeGeometry, DefaultCompositeSolid, DefaultCompositeSurface, DefaultCurve, DefaultEnvelope, DefaultMultiGeometry, DefaultOrientableCurve, DefaultOrientableSurface, DefaultPoint, DefaultPolyhedralSurface, DefaultRing, DefaultSolid, DefaultSurface, DefaultTin, DefaultTriangulatedSurface

public abstract class AbstractDefaultGeometry
extends Object
implements Geometry

Abstract base class for the default Geometry implementation.

This implementation is built around JTS (Java Topology Suite) geometries which are used to evaluate topological predicates (e.g. intersects) and perform spatial analysis operations (e.g union). Simple geometries (e.g. LineStrings are mapped to a corresponding JTS object, for complex ones (e.g. Curves with non-linear segments), the JTS geometry only approximates the original geometry. See this page for a discussion.

Version:

$Revision: 21944 $, $Date: 2010-01-14 11:42:58 +0100 (Do, 14 Jan 2010) $

Author:

Markus Schneider, last edited by: $Author: rbezema $

Nested Class Summary

Nested classes/interfaces inherited from interface org.deegree.geometry.Geometry

Geometry.GeometryType

Field Summary

protected CRS	crs Reference to a coordinate system.
protected String	id Geometry identifier.
protected static com.vividsolutions.jts.geom.GeometryFactory	jtsFactory Used to built JTS geometries.
protected com.vividsolutions.jts.geom.Geometry	jtsGeometry
protected PrecisionModel	pm

Constructor Summary

AbstractDefaultGeometry(String id, CRS crs, PrecisionModel pm)

Method Summary

protected com.vividsolutions.jts.geom.Geometry	buildJTSGeometry()
boolean	contains(Geometry geometry) Tests whether this geometry contains the specified geometry.
AbstractDefaultGeometry	createFromJTS(com.vividsolutions.jts.geom.Geometry jtsGeom) Helper methods for creating AbstractDefaultGeometry from JTS geometries that have been derived from this geometry by JTS spatial analysis methods.
boolean	crosses(Geometry geometry) Tests whether this geometry crosses the specified geometry.
boolean	equals(Geometry geometry) Tests whether this geometry is equal to the specified geometry.
protected static AbstractDefaultGeometry	getAsDefaultGeometry(Geometry geometry)
Geometry	getBuffer(Measure distance) Return a new Geometry that contains all points with a distance from this Geometry that is less than or equal to the specified distance.
Point	getCentroid() Returns the centroid of the geometry.
Geometry	getConvexHull() Returns the convex hull of the geometry.
CRS	getCoordinateSystem() Returns the associated spatial reference system.
Geometry	getDifference(Geometry geometry) Returns the set-theoretic difference of this and the passed Geometry.
Measure	getDistance(Geometry geometry, Unit requestedUnit) Returns the minimum distance between this and the specified geometry.
Envelope	getEnvelope() Returns the minimal bounding box of the geometry.
GMLStdProps	getGMLProperties() Returns the standard GML properties (e.g.
String	getId() Returns the id of the geometry.
Geometry	getIntersection(Geometry geometry) Returns the set-theoretic intersection of this and the passed Geometry.
com.vividsolutions.jts.geom.Geometry	getJTSGeometry() Returns an equivalent (or best-fit) JTS geometry object.
PrecisionModel	getPrecision() Returns the PrecisionModel of the geometry.
Geometry	getUnion(Geometry geometry) Returns the set-theoretic union of this and the passed Geometry.
boolean	intersects(Geometry geometry) Tests whether this geometry intersects the specified geometry.
boolean	isBeyond(Geometry geometry, Measure distance) Tests whether this geometry is beyond a specified distance of a second geometry.
boolean	isDisjoint(Geometry geometry) Tests whether this geometry is disjoint from the specified geometry.
boolean	isWithin(Geometry geometry) tests whether the value of a geometric is topological located within this geometry.
boolean	isWithinDistance(Geometry geometry, Measure distance) Tests whether this geometry is within a specified distance of a second geometry.
boolean	overlaps(Geometry geometry) Tests whether this geometry overlaps the specified geometry.
void	setCoordinateSystem(CRS crs) Sets the associated spatial reference system.
void	setGMLProperties(GMLStdProps standardProps) Sets the attached properties (e.g.
void	setId(String id) Sets the id of the geometry.
void	setPrecision(PrecisionModel pm) Sets the PrecisionModel of the geometry.
String	toString()
boolean	touches(Geometry geometry) Tests whether this geometry touches the specified geometry.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.deegree.geometry.Geometry

getCoordinateDimension, getGeometryType

Field Detail

jtsFactory

protected static final com.vividsolutions.jts.geom.GeometryFactory jtsFactory

Used to built JTS geometries.

id

protected String id

Geometry identifier.

crs

protected CRS crs

Reference to a coordinate system.

pm

protected PrecisionModel pm

jtsGeometry

protected com.vividsolutions.jts.geom.Geometry jtsGeometry

Constructor Detail

AbstractDefaultGeometry

public AbstractDefaultGeometry(String id,
                               CRS crs,
                               PrecisionModel pm)

Parameters:

id -

crs -

pm -

Method Detail

getId

public String getId()

Description copied from interface: Geometry

Returns the id of the geometry.

In a GML representation of the geometry, this corresponds to the gml:id (GML 3 and later) or gid (GML 2) attribute of the geometry element.

Specified by:

getId in interface Geometry

Specified by:

getId in interface GMLObject

Returns:

the id of the geometry, or null if it is an anonymous (unidentified) geometry

setId

public void setId(String id)

Description copied from interface: Geometry

Sets the id of the geometry.

Specified by:

setId in interface Geometry

Parameters:

id - id of the geometry

getCoordinateSystem

public CRS getCoordinateSystem()

Description copied from interface: Geometry

Returns the associated spatial reference system.

Specified by:

getCoordinateSystem in interface Geometry

Returns:

spatial reference system, may be null

setCoordinateSystem

public void setCoordinateSystem(CRS crs)

Description copied from interface: Geometry

Sets the associated spatial reference system.

Specified by:

setCoordinateSystem in interface Geometry

Parameters:

crs - spatial reference system, may be null

getPrecision

public PrecisionModel getPrecision()

Description copied from interface: Geometry

Returns the PrecisionModel of the geometry.

Specified by:

getPrecision in interface Geometry

Returns:

the precision model

setPrecision

public void setPrecision(PrecisionModel pm)

Description copied from interface: Geometry

Sets the PrecisionModel of the geometry.

Specified by:

setPrecision in interface Geometry

Parameters:

pm - the precision model to set

intersects

public boolean intersects(Geometry geometry)

Description copied from interface: Geometry

Tests whether this geometry intersects the specified geometry. TODO formal explanation (DE9IM)

Specified by:

intersects in interface Geometry

Parameters:

geometry - the Geometry to test this Geometry against

Returns:

true if this Geometry intersects geometry

isDisjoint

public boolean isDisjoint(Geometry geometry)

Description copied from interface: Geometry

Tests whether this geometry is disjoint from the specified geometry. TODO formal explanation (DE9IM)

Specified by:

isDisjoint in interface Geometry

Parameters:

geometry - the Geometry to test this Geometry against

Returns:

true if this Geometry is disjoint from geometry

overlaps

public boolean overlaps(Geometry geometry)

Description copied from interface: Geometry

Tests whether this geometry overlaps the specified geometry. TODO formal explanation (DE9IM)

Specified by:

overlaps in interface Geometry

Parameters:

geometry - the Geometry to test this Geometry against

Returns:

true if this Geometry overlaps geometry

touches

public boolean touches(Geometry geometry)

Description copied from interface: Geometry

Tests whether this geometry touches the specified geometry. TODO formal explanation (DE9IM)

Specified by:

touches in interface Geometry

Parameters:

geometry - the Geometry to test this Geometry against

Returns:

true if this Geometry touches geometry

isWithin

public boolean isWithin(Geometry geometry)

Description copied from interface: Geometry

tests whether the value of a geometric is topological located within this geometry. This method is the opposite of Geometry.contains(Geometry) method

Specified by:

isWithin in interface Geometry

Returns:

true if passed geometry is located completly within this geometry

isWithinDistance

public boolean isWithinDistance(Geometry geometry,
                                Measure distance)

Description copied from interface: Geometry

Tests whether this geometry is within a specified distance of a second geometry.

Specified by:

isWithinDistance in interface Geometry

Parameters:

geometry - second geometry

Returns:

true, iff the distance between this and the second geometry is less than or equal distance

isBeyond

public boolean isBeyond(Geometry geometry,
                        Measure distance)

Description copied from interface: Geometry

Tests whether this geometry is beyond a specified distance of a second geometry.

Specified by:

isBeyond in interface Geometry

Parameters:

geometry - second geometry

Returns:

true, iff the minimum distance between this and the second geometry is greater than distance

contains

public boolean contains(Geometry geometry)

Description copied from interface: Geometry

Tests whether this geometry contains the specified geometry. TODO formal explanation (DE9IM)

Specified by:

contains in interface Geometry

Parameters:

geometry - the Geometry to test this Geometry against

Returns:

true if this Geometry contains geometry

crosses

public boolean crosses(Geometry geometry)

Description copied from interface: Geometry

Tests whether this geometry crosses the specified geometry. TODO formal explanation (DE9IM)

Specified by:

crosses in interface Geometry

Parameters:

geometry - the Geometry to test this Geometry against

Returns:

true if this Geometry crosses geometry

equals

public boolean equals(Geometry geometry)

Description copied from interface: Geometry

Tests whether this geometry is equal to the specified geometry. TODO formal explanation (DE9IM)

Specified by:

equals in interface Geometry

Parameters:

geometry - the Geometry to test this Geometry against

Returns:

true if this Geometry is equal to geometry

getCentroid

public Point getCentroid()

Description copied from interface: Geometry

Returns the centroid of the geometry.

Specified by:

getCentroid in interface Geometry

Returns:

a Point that is the centroid of this geometry

getDistance

public Measure getDistance(Geometry geometry,
                           Unit requestedUnit)

Description copied from interface: Geometry

Returns the minimum distance between this and the specified geometry.

Specified by:

getDistance in interface Geometry

Parameters:

geometry - second geometry

requestedUnit - unit of the

Returns:

shortest distance between the two geometries

getIntersection

public Geometry getIntersection(Geometry geometry)

Description copied from interface: Geometry

Returns the set-theoretic intersection of this and the passed Geometry.

Specified by:

getIntersection in interface Geometry

Parameters:

geometry - other geometry, must not be null

Returns:

intersection Geometry or null (empty set)

getUnion

public Geometry getUnion(Geometry geometry)

Description copied from interface: Geometry

Returns the set-theoretic union of this and the passed Geometry.

Specified by:

getUnion in interface Geometry

Parameters:

geometry - other geometry, must not be null

Returns:

united Geometry (never null)

getDifference

public Geometry getDifference(Geometry geometry)

Description copied from interface: Geometry

Returns the set-theoretic difference of this and the passed Geometry.

Specified by:

getDifference in interface Geometry

Parameters:

geometry - other geometry, must not be null

Returns:

difference Geometry or null (empty set)

getBuffer

public Geometry getBuffer(Measure distance)

Description copied from interface: Geometry

Return a new Geometry that contains all points with a distance from this Geometry that is less than or equal to the specified distance.

Specified by:

getBuffer in interface Geometry

Returns:

buffer geometry

getConvexHull

public Geometry getConvexHull()

Description copied from interface: Geometry

Returns the convex hull of the geometry.

Specified by:

getConvexHull in interface Geometry

Returns:

convex hull of a Geometry

getEnvelope

public Envelope getEnvelope()

Description copied from interface: Geometry

Returns the minimal bounding box of the geometry.

Specified by:

getEnvelope in interface Geometry

Returns:

the minimal bounding box of the geometry

getJTSGeometry

public com.vividsolutions.jts.geom.Geometry getJTSGeometry()

Returns an equivalent (or best-fit) JTS geometry object.

Returns:

an equivalent (or best-fit) JTS geometry

buildJTSGeometry

protected com.vividsolutions.jts.geom.Geometry buildJTSGeometry()

getGMLProperties

public GMLStdProps getGMLProperties()

Description copied from interface: GMLObject

Returns the standard GML properties (e.g. gml:name).

Specified by:

getGMLProperties in interface GMLObject

Returns:

the standard GML properties, may be

setGMLProperties

public void setGMLProperties(GMLStdProps standardProps)

Description copied from interface: Geometry

Sets the attached properties (e.g. GML standard properties, such as gml:name).

Specified by:

setGMLProperties in interface Geometry

Parameters:

standardProps - properties to be attached

createFromJTS

public AbstractDefaultGeometry createFromJTS(com.vividsolutions.jts.geom.Geometry jtsGeom)

Helper methods for creating AbstractDefaultGeometry from JTS geometries that have been derived from this geometry by JTS spatial analysis methods.

Parameters:

jtsGeom -

Returns:

geometry with precision model and CRS information that are identical to the ones of this geometry, or null if the given geometry is an empty collection

getAsDefaultGeometry

protected static AbstractDefaultGeometry getAsDefaultGeometry(Geometry geometry)

toString

public String toString()

Overrides:

toString in class Object