org.deegree.model.spatialschema
Class GeometryImpl

java.lang.Object
  org.deegree.model.spatialschema.GeometryImpl

All Implemented Interfaces:

Serializable, Geometry

Direct Known Subclasses:

AggregateImpl, BoundaryImpl, PrimitiveImpl

public abstract class GeometryImpl
extends Object
implements Geometry, Serializable

Default implementation of the Geometry interface from package deegree.model. The implementation is abstract because only the management of the spatial reference system is unique for all geometries.

Version:

$Revision: 9343 $ $Date: 2007-12-27 14:30:32 +0100 (Do, 27 Dez 2007) $

Author:

Andreas Poth, Markus Schneider

See Also:

Serialized Form

Field Summary

protected Boundary	boundary
protected Point	centroid
protected Geometry	convexHull
protected CoordinateSystem	crs
protected boolean	empty
protected Envelope	envelope
protected static double	mute
protected boolean	valid

Constructor Summary

protected

GeometryImpl(CoordinateSystem crs) constructor that sets the spatial reference system

Method Summary

protected abstract void	calculateParam() recalculates internal parameters
Object	clone()
boolean	contains(Geometry that) The Boolean valued operation "contains" shall return TRUE if this Geometry contains another Geometry.
boolean	contains(Position position) The Boolean valued operation "contains" shall return TRUE if this Geometry contains a single point given by a coordinate.
Geometry	difference(Geometry that) The "difference" operation shall return the set theoretic difference of this Geometry and the passed Geometry.
double	distance(Geometry gmo) The operation "distance" shall return the distance between this Geometry and another Geometry.
boolean	equals(Object that) Compares the Geometry to be equal to another Geometry.
Boundary	getBoundary() returns the boundary of the surface as general boundary
Geometry	getBuffer(double distance) The operation "buffer" shall return a Geometry containing all points whose distance from this Geometry is less than or equal to the "distance" passed as a parameter.
Point	getCentroid() The operation "centroid" shall return the mathematical centroid for this Geometry.
Geometry	getConvexHull() The operation "convexHull" shall return a Geometry that represents the convex hull of this Geometry.
CoordinateSystem	getCoordinateSystem() returns the spatial reference system of a geometry
Envelope	getEnvelope() returns the bounding box / envelope of a geometry
double	getTolerance() returns the tolerance value use for topological operations
Geometry	intersection(Geometry that) The "intersection" operation shall return the set theoretic intersection of this Geometry and the passed Geometry.
boolean	intersects(Geometry that) The Boolean valued operation "intersects" shall return TRUE if this Geometry intersects another Geometry.
boolean	isEmpty() returns true if no geometry values resp. points stored within the geometry.
protected boolean	isValid()
boolean	isWithinDistance(Geometry that, double distance) provide optimized proximity queries within for a distance . calvin added on 10/21/2003
void	setCoordinateSystem(CoordinateSystem crs) sets the spatial reference system
void	setEmpty(boolean empty)
void	setTolerance(double tolerance) sets tolerance value use for topological operations
protected void	setValid(boolean valid)
String	toString()
void	translate(double[] d) dummy implementation of this method
Geometry	union(Geometry that) The "union" operation shall return the set theoretic union of this Geometry and the passed Geometry.

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.deegree.model.spatialschema.Geometry

getCoordinateDimension, getDimension

Field Detail

mute

protected static double mute

crs

protected CoordinateSystem crs

boundary

protected Boundary boundary

envelope

protected Envelope envelope

convexHull

protected Geometry convexHull

centroid

protected Point centroid

empty

protected boolean empty

valid

protected boolean valid

Constructor Detail

GeometryImpl

protected GeometryImpl(CoordinateSystem crs)

constructor that sets the spatial reference system

Parameters:

crs - new spatial reference system

Method Detail

getCoordinateSystem

public CoordinateSystem getCoordinateSystem()

Description copied from interface: Geometry

returns the spatial reference system of a geometry

Specified by:

getCoordinateSystem in interface Geometry

Returns:

the spatial reference system of a geometry

setCoordinateSystem

public void setCoordinateSystem(CoordinateSystem crs)

sets the spatial reference system

Parameters:

crs - new spatial reference system

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Returns:

a shallow copy of the geometry. this isn't realized at this level so a CloneNotSupportedException will be thrown.

Throws:

CloneNotSupportedException

isEmpty

public boolean isEmpty()

Description copied from interface: Geometry

returns true if no geometry values resp. points stored within the geometry.

Specified by:

isEmpty in interface Geometry

Returns:

true if no geometry values resp. points stored within the geometry.

setEmpty

public void setEmpty(boolean empty)

Parameters:

empty - indicates the geometry as empty

getBoundary

public Boundary getBoundary()

returns the boundary of the surface as general boundary

Specified by:

getBoundary in interface Geometry

translate

public void translate(double[] d)

dummy implementation of this method

Specified by:

translate in interface Geometry

distance

public double distance(Geometry gmo)

The operation "distance" shall return the distance between this Geometry and another Geometry. This distance is defined to be the greatest lower bound of the set of distances between all pairs of points that include one each from each of the two Geometries. A "distance" value shall be a positive number associated to distance units such as meters or standard foot. If necessary, the second geometric object shall be transformed into the same coordinate reference system as the first before the distance is calculated.

If the geometric objects overlap, or touch, then their distance apart shall be zero. Some current implementations use a "negative" distance for such cases, but the approach is neither consistent between implementations, nor theoretically viable.

Specified by:

distance in interface Geometry

getCentroid

public Point getCentroid()

The operation "centroid" shall return the mathematical centroid for this Geometry. The result is not guaranteed to be on the object. For heterogeneous collections of primitives, the centroid only takes into account those of the largest dimension. For example, when calculating the centroid of surfaces, an average is taken weighted by area. Since curves have no area they do not contribute to the average.

Specified by:

getCentroid in interface Geometry

getEnvelope

public Envelope getEnvelope()

returns the bounding box / envelope of a geometry

Specified by:

getEnvelope in interface Geometry

getConvexHull

public Geometry getConvexHull()

The operation "convexHull" shall return a Geometry that represents the convex hull of this Geometry.

This method throws an

Specified by:

getConvexHull in interface Geometry

See Also:

an may has an useful implementation in extending classes

getBuffer

public Geometry getBuffer(double distance)

The operation "buffer" shall return a Geometry containing all points whose distance from this Geometry is less than or equal to the "distance" passed as a parameter. The Geometry returned is in the same reference system as this original Geometry. The dimension of the returned Geometry is normally the same as the coordinate dimension - a collection of Surfaces in 2D space and a collection of Solids in 3D space, but this may be application defined.

This method throws an

Specified by:

getBuffer in interface Geometry

See Also:

an may has an useful implementation in extending classes

contains

public boolean contains(Geometry that)

The Boolean valued operation "contains" shall return TRUE if this Geometry contains another Geometry.

Specified by:

contains in interface Geometry

Parameters:

that - the Geometry to test (whether is is contained)

Returns:

true if the given object is contained, else false

contains

public boolean contains(Position position)

The Boolean valued operation "contains" shall return TRUE if this Geometry contains a single point given by a coordinate.

Specified by:

contains in interface Geometry

Parameters:

position - Position to test (whether is is contained)

Returns:

true if the given object is contained, else false

intersects

public boolean intersects(Geometry that)

The Boolean valued operation "intersects" shall return TRUE if this Geometry intersects another Geometry. Within a Complex, the Primitives do not intersect one another. In general, topologically structured data uses shared geometric objects to capture intersection information.

Specified by:

intersects in interface Geometry

Parameters:

that - the Geometry to intersect with

Returns:

true if the objects intersects, else false

union

public Geometry union(Geometry that)

The "union" operation shall return the set theoretic union of this Geometry and the passed Geometry.

Specified by:

union in interface Geometry

Parameters:

that - the Geometry to unify

Returns:

intersection or null, if computation failed

intersection

public Geometry intersection(Geometry that)
                      throws GeometryException

The "intersection" operation shall return the set theoretic intersection of this Geometry and the passed Geometry.

Specified by:

intersection in interface Geometry

Parameters:

that - the Geometry to intersect with

Returns:

intersection or null, if it is empty (or computation failed)

Throws:

GeometryException

difference

public Geometry difference(Geometry that)

The "difference" operation shall return the set theoretic difference of this Geometry and the passed Geometry.

Specified by:

difference in interface Geometry

Parameters:

that - the Geometry to calculate the difference with

Returns:

difference or null, if it is empty (or computation failed)

equals

public boolean equals(Object that)

Compares the Geometry to be equal to another Geometry.

Overrides:

equals in class Object

Parameters:

that - the Geometry to test for equality

Returns:

true if the objects are equal, else false

isWithinDistance

public boolean isWithinDistance(Geometry that,
                                double distance)

provide optimized proximity queries within for a distance . calvin added on 10/21/2003

Specified by:

isWithinDistance in interface Geometry

setTolerance

public void setTolerance(double tolerance)

sets tolerance value use for topological operations

Specified by:

setTolerance in interface Geometry

Parameters:

tolerance -

getTolerance

public double getTolerance()

returns the tolerance value use for topological operations

Specified by:

getTolerance in interface Geometry

Returns:

tolerance value use for topological operations

setValid

protected void setValid(boolean valid)

Parameters:

valid - invalidates the calculated parameters of the Geometry

isValid

protected boolean isValid()

Returns:

true if the calculated parameters of the Geometry are valid and false if they must be recalculated

calculateParam

protected abstract void calculateParam()

recalculates internal parameters

toString

public String toString()

Overrides:

toString in class Object

Returns:

the String representation containing the crs, empty-field and the mut-field