org.geotools.filter.function

Interface RenderingTransformation

All Superinterfaces:

Expression, Function

All Known Subinterfaces:

CoverageReadingTransformation

All Known Implementing Classes:

FootprintsTransformation

public interface RenderingTransformation
extends Function

An interface to be implemented by processes or by filter functions meant to be integrated as feature collection/grid coverage transformations in a rendering chain.

These functions are meant to take one layer (raster or vector) and apply transformations on top of it

The method provide information about how the data is altered so that the renderer can query the appropriate part of the input data that will feed the process/function

Author:

Andrea Aime - GeoSolutions

Field Summary

Fields inherited from interface Expression

NIL

Method Summary

Modifier and Type	Method and Description
default GeneralParameterValue[]	customizeReadParams(GridCoverageReader reader, GeneralParameterValue... params) Allows the transformation to customize the read
GridGeometry	invertGridGeometry(Query targetQuery, GridGeometry targetGridGeometry) Given a target query and a target grid geometry returns the grid geometry to be used to read the input data of the function involved in rendering.
Query	invertQuery(Query targetQuery, GridGeometry gridGeometry) Given a target query and a target grid geometry returns the query to be used to read the input data of the function This method will be called only if the input data is a feature collection.

Methods inherited from interface Function

getFallbackValue, getFunctionName, getName, getParameters

Methods inherited from interface Expression

accept, evaluate, evaluate

Method Detail

invertQuery

Query invertQuery(Query targetQuery,
                  GridGeometry gridGeometry)

Given a target query and a target grid geometry returns the query to be used to read the input data of the function This method will be called only if the input data is a feature collection.

Returns:

The transformed query, or null if no inversion is possible/meaningful

invertGridGeometry

GridGeometry invertGridGeometry(Query targetQuery,
                                GridGeometry targetGridGeometry)

Given a target query and a target grid geometry returns the grid geometry to be used to read the input data of the function involved in rendering. This method will be called only if the input data is a grid coverage or a grid coverage reader

Returns:

The transformed query, or null if no inversion is possible/meaningful

customizeReadParams

default GeneralParameterValue[] customizeReadParams(GridCoverageReader reader,
                                                    GeneralParameterValue... params)

Allows the transformation to customize the read