Package org.geotools.process.vector

Class TransformProcess

Object
TransformProcess
All Implemented Interfaces:
VectorProcess
public class TransformProcess extends Object implements VectorProcess
Used to transform a feature collection as defined using a series of expressions.

The definition of the output feature type can be provided as a TransformProcess.Definition data structure or using a simple string format: 

 the_geom=the_geom
 name=name
 area=area( the_geom )
Attribute definitions can be delimited by line breaks and/or by semicolons.

This is a very flexible process which can be used to:

  • Change the order of attributes - resulting in a new feature type: 
     INPUT Schema          DEFINITION                     OUTPUT Schema
 the_geom: Polygon     the_geom                       the_geom: Polygon
 name: String          id                             id: Long
 id: Long              name                           name: String
 description: String   description                    description: String
  • Rename or remove attributes - resulting in a new feature type: 
     INPUT Schema          DEFINITION                     OUTPUT Schema
 the_geom: Polygon     the_geom                       the_geom: Polygon
 name: String          id_code=id                     id_code: Long
 id: Long              summary=description            summary: String
 description: String
  • Process geometry - using functions like "the_geom=simplify( the_geom, 2.0 )" or "the_geom=centriod( the_geom )": 
     INPUT Schema          DEFINITION                     OUTPUT Schema
 the_geom: Polygon     the_geom=centriod(the_geom)    the_geom: Point
 name: String          name                           name: String
 id: Long              id                             id: Long
 description: String   description                    description: String
  • Generate additional attributes using the form: area=area( the_geom ): 
     INPUT Schema          DEFINITION                     OUTPUT Schema
 the_geom: Polygon     the_geom=centriod(the_geom)    the_geom: Point
 name: String          name                           name: String
 id: Long              id                             id: Long
 description: String   description                    description: String
                       area=area( the_geom)           area: Double
                       text=concatenate(name,'-',id)  text: String

This is a port of the uDig "reshape" operation to the GeoTools process framework.

Author:
Jody Garnett (LISAsoft)