geos::noding::FastNodingValidator Class Reference

Validates that a collection of SegmentStrings is correctly noded. More...

#include <FastNodingValidator.h>

Public Member Functions
	FastNodingValidator (std::vector< noding::SegmentString * > &newSegStrings)
bool	isValid ()
	Checks for an intersection and reports if one is found.
std::string	getErrorMessage () const
	Returns an error message indicating the segments containing the intersection.
void	checkValid ()
	Checks for an intersection and throws a TopologyException if one is found.

Detailed Description

Validates that a collection of SegmentStrings is correctly noded.

Indexing is used to improve performance. By default validation stops after a single non-noded intersection is detected. Alternatively, it can be requested to detect all intersections by using setFindAllIntersections(boolean).

The validator does not check for topology collapse situations (e.g. where two segment strings are fully co-incident).

The validator checks for the following situations which indicated incorrect noding:

• Proper intersections between segments (i.e. the intersection is interior to both segments)
• Intersections at an interior vertex (i.e. with an endpoint or another interior vertex)

The client may either test the isValid() condition, or request that a suitable TopologyException be thrown.

Member Function Documentation

checkValid()

void geos::noding::FastNodingValidator::checkValid

(

)

Checks for an intersection and throws a TopologyException if one is found.

Exceptions

TopologyException

if an intersection is found

getErrorMessage()

std::string geos::noding::FastNodingValidator::getErrorMessage

(

)

const

Returns an error message indicating the segments containing the intersection.

Returns

an error message documenting the intersection location

isValid()

bool geos::noding::FastNodingValidator::isValid ( )

inline

Checks for an intersection and reports if one is found.

Returns

true if the arrangement contains an interior intersection

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The documentation for this class was generated from the following file:

• FastNodingValidator.h