public class GeometryTransformer extends Object
Geometryinto an output
Geometry, possibly changing its structure and type(s). This class is a framework for implementing subclasses which perform transformations on various different Geometry subclasses. It provides an easy way of applying specific transformations to given geometry types, while allowing unhandled types to be simply copied. Also, the framework ensures that if subcomponents change type the parent geometries types change appropriately to maintain valid structure. Subclasses will override whichever
transformXmethods they need to to handle particular Geometry types.
A typically usage would be a transformation class that transforms Polygons into
Polygons, LineStrings or Points, depending on the geometry of the input
(For instance, a simplification operation).
This class would likely need to override the
method to ensure that if input Polygons change type the result is a GeometryCollection,
not a MultiPolygon.
The default behaviour of this class is simply to recursively transform each Geometry component into an identical object by deep copying down to the level of, but not including, coordinates.
transformX methods may return
to avoid creating empty or invalid geometry objects. This will be handled correctly
by the transformer.
transformXXX methods should always return valid
geometry - if they cannot do this they should return
(for instance, it may not be possible for a transformLineString implementation
to return at least two points - in this case, it should return
transform(Geometry) method itself will always
return a non-null Geometry object (but this may be empty).
|Constructor and Description|
|Modifier and Type||Method and Description|
Utility function to make input geometry available
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