| Class | Description | 
|---|---|
| AttributePredicate | 
 A function object for  
Geometry functions (which return a Geometry). | 
| AttributeQueryPlugIn | 
 Queries a layer by a spatial predicate. 
 | 
| BufferPlugIn | 
 PlugIn performing buffer operations authorized by JTS BufferOp class. 
 | 
| CalculateAreasAndLengthsPlugIn | 
 Calculates areas and lengths from information obtained
 from the user via a  
MultiInputDialog. | 
| ConvexHullPlugIn | |
| GeometryFunction | 
 A function object for  
Geometry functions (which return a Geometry). | 
| GeometryFunctionPlugIn | 
 Provides basic functions for computation with  
Geometry objects. | 
| GeometryPredicate | 
 A function object for  
Geometry functions (which return a Geometry). | 
| GeometryPredicate.DisjointPredicate | |
| GeometryPredicate.SimilarPredicate | |
| GeometryPredicate.WithinDistancePredicate | |
| OffsetCurvePlugIn | 
 PlugIn creating an offset linestring from a linear geometry. 
 | 
| OverlayPlugIn | 
 Creates a new layer containing intersections of all pairs of
 features from two input layers. 
 | 
| SpatialJoinExecuter | 
 Exceutes a spatial query with a given mask FeatureCollection, source FeatureCollection,
 and predicate. 
 | 
| SpatialJoinPlugIn | 
 Queries a layer by a spatial predicate. 
 | 
| SpatialQueryExecuter | 
 Exceutes a spatial query with a given mask FeatureCollection, source FeatureCollection,
 and predicate. 
 | 
| SpatialQueryPlugIn | 
 Queries a layer by a spatial predicate. 
 | 
| UnionPlugIn |