org.deegree.filter.function.se
Class Interpolate

java.lang.Object
  org.deegree.filter.expression.Function
      org.deegree.filter.function.se.Interpolate

All Implemented Interfaces:

Expression

public class Interpolate
extends Function

Interpolate

Version:

$Revision: 22318 $, $Date: 2010-02-01 16:17:10 +0100 (Mo, 01 Feb 2010) $

Author:

Andreas Schmitz, Andrei Aiordachioaie, last edited by: $Author: aschmitz $

Nested Class Summary

Nested classes/interfaces inherited from interface org.deegree.filter.Expression

Expression.Type

Constructor Summary

Interpolate()

Method Summary

(package private) void	buildLookupArrays() Create the sorted lookup arrays from the linked lists, so that we can perform binary search.
Object[]	evaluate(MatchableObject f) Determines the values of the expression for the given MatchableObject.
BufferedImage	evaluateRaster(AbstractRaster raster, RasterStyling style) Construct an image map, as the result of the Interpolate operation
double	lookup2(double value) Looks up a value in the current data values.
Color	lookup2Color(double value) Performs interpolation on a value, and returns a color built from the interpolated value.
void	parse(XMLStreamReader in)
void	parseSLD100(XMLStreamReader in)
String	toString()

Methods inherited from class org.deegree.filter.expression.Function

getName, getParameters, getParams, getType, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Interpolate

public Interpolate()

Method Detail

evaluate

public Object[] evaluate(MatchableObject f)

Description copied from interface: Expression

Determines the values of the expression for the given MatchableObject.

Note that this returns an Object[], as an expression may evaluate to multiple values, e.g. a PropertyName that targets a multi property of a feature.

Specified by:

evaluate in interface Expression

Overrides:

evaluate in class Function

Parameters:

f - object that the expression is evaluated upon

Returns:

the values of the expression, may be empty (and even contain null values), but never null

parse

public void parse(XMLStreamReader in)
           throws XMLStreamException

Parameters:

in -

Throws:

XMLStreamException

parseSLD100

public void parseSLD100(XMLStreamReader in)
                 throws XMLStreamException

Parameters:

in -

Throws:

XMLStreamException

buildLookupArrays

void buildLookupArrays()

Create the sorted lookup arrays from the linked lists, so that we can perform binary search.

evaluateRaster

public BufferedImage evaluateRaster(AbstractRaster raster,
                                    RasterStyling style)

Construct an image map, as the result of the Interpolate operation

Parameters:

raster - input raster

style - raster style, containing channel mappings (if applicable)

Returns:

a buffered image with the processed data

lookup2Color

public Color lookup2Color(double value)

Performs interpolation on a value, and returns a color built from the interpolated value. Uses binary search for optimization.

Parameters:

value - value

Returns:

the corresponding Color

lookup2

public final double lookup2(double value)

Looks up a value in the current data values. Uses binary search for optimization.

Parameters:

value -

Returns:

the interpolated value

toString

public String toString()

Overrides:

toString in class Object