org.geomajas.command.geometry
Class GeometryAreaCommand

java.lang.Object
  org.geomajas.command.geometry.GeometryAreaCommand

All Implemented Interfaces:

Command<GeometryAreaRequest,GeometryAreaResponse>

@Component
@Api
public class GeometryAreaCommand
extends Object
implements Command<GeometryAreaRequest,GeometryAreaResponse>

This command calculates the (approximate) geographical area of a geometry.

Since:

1.11.0

Author:

Jan De Moerloose

Constructor Summary

GeometryAreaCommand()

Method Summary

void	execute(GeometryAreaRequest request, GeometryAreaResponse response) Calculate the geographical area for each of the requested geometries.
GeometryAreaResponse	getEmptyCommandResponse()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GeometryAreaCommand

public GeometryAreaCommand()

Method Detail

getEmptyCommandResponse

public GeometryAreaResponse getEmptyCommandResponse()

Specified by:

getEmptyCommandResponse in interface Command<GeometryAreaRequest,GeometryAreaResponse>

execute

public void execute(GeometryAreaRequest request,
                    GeometryAreaResponse response)
             throws Exception

Calculate the geographical area for each of the requested geometries. The current algorithm uses the global sinusoidal projection (a so-called equal-area projection) and assumes a spherical earth. More accurate projections exist (Albers, Mollweide, ...) but they are more complicated and cause tolerance problems when directly applied with Geotools transformations.

Specified by:

execute in interface Command<GeometryAreaRequest,GeometryAreaResponse>

Parameters:

request - request parameters

response - response object

Throws:

Exception - in case of problems