Package org.locationtech.jts.geom.util
Class GeometryFixer
- java.lang.Object
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- org.locationtech.jts.geom.util.GeometryFixer
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public class GeometryFixer extends java.lang.Object
Fixes a geometry to be a valid geometry, while preserving as much as possible of the shape and location of the input. Validity is determined according toGeometry.isValid()
.Input geometries are always processed, so even valid inputs may have some minor alterations. The output is always a new geometry object.
Semantic Rules
- Vertices with non-finite X or Y ordinates are removed
(as per
Coordinate.isValid()
. - Repeated points are reduced to a single point
- Empty atomic geometries are valid and are returned unchanged
- Empty elements are removed from collections
Point
: keep valid coordinate, or EMPTYLineString
: coordinates are fixedLinearRing
: coordinates are fixed. Keep valid ring, or else convert intoLineString
Polygon
: transform into a valid polygon, preserving as much of the extent and vertices as possible.- Rings are fixed to ensure they are valid
- Holes intersecting the shell are subtracted from the shell
- Holes outside the shell are converted into polygons
MultiPolygon
: each polygon is fixed, then result made non-overlapping (via union)GeometryCollection
: each element is fixed- Collapsed lines and polygons are handled as follows,
depending on the
keepCollapsed
setting:false
: (default) collapses are converted to empty geometries (and removed if they are elements of collections)true
: collapses are converted to a valid geometry of lower dimension
- Author:
- Martin Davis
- See Also:
Geometry.isValid()
- Vertices with non-finite X or Y ordinates are removed
(as per
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Constructor Summary
Constructors Constructor Description GeometryFixer(Geometry geom)
Creates a new instance to fix a given geometry.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static Geometry
fix(Geometry geom)
Fixes a geometry to be valid.static Geometry
fix(Geometry geom, boolean isKeepMulti)
Fixes a geometry to be valid, allowing to set a flag controlling how single item results from fixedMULTI
geometries should be returned.Geometry
getResult()
Gets the fixed geometry.void
setKeepCollapsed(boolean isKeepCollapsed)
Sets whether collapsed geometries are converted to empty, (which will be removed from collections), or to a valid geometry of lower dimension.void
setKeepMulti(boolean isKeepMulti)
Sets whether fixedMULTI
geometries that consist of only one item should still be returned asMULTI
geometries.
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Constructor Detail
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GeometryFixer
public GeometryFixer(Geometry geom)
Creates a new instance to fix a given geometry.- Parameters:
geom
- the geometry to be fixed
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Method Detail
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fix
public static Geometry fix(Geometry geom)
Fixes a geometry to be valid.- Parameters:
geom
- the geometry to be fixed- Returns:
- the valid fixed geometry
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fix
public static Geometry fix(Geometry geom, boolean isKeepMulti)
Fixes a geometry to be valid, allowing to set a flag controlling how single item results from fixedMULTI
geometries should be returned.- Parameters:
geom
- the geometry to be fixedisKeepMulti
- a flag indicating ifMULTI
geometries should not be converted to single instance types if they consist of only one item.- Returns:
- the valid fixed geometry
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setKeepCollapsed
public void setKeepCollapsed(boolean isKeepCollapsed)
Sets whether collapsed geometries are converted to empty, (which will be removed from collections), or to a valid geometry of lower dimension. The default is to convert collapses to empty geometries.- Parameters:
isKeepCollapsed
- whether collapses should be converted to a lower dimension geometry
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setKeepMulti
public void setKeepMulti(boolean isKeepMulti)
Sets whether fixedMULTI
geometries that consist of only one item should still be returned asMULTI
geometries. The default is to keepMULTI
geometries.- Parameters:
isKeepMulti
- flag whether to keepMULTI
geometries.
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getResult
public Geometry getResult()
Gets the fixed geometry.- Returns:
- the fixed geometry
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