org.deegree.filter.expression.custom.se
Class Categorize

java.lang.Object
  org.deegree.filter.expression.custom.AbstractCustomExpression
      org.deegree.filter.expression.custom.se.Categorize

All Implemented Interfaces:

Expression, CustomExpression

public class Categorize
extends AbstractCustomExpression

Categorize

Version:

$Revision: 31400 $, $Date: 2011-08-02 10:11:48 +0200 (Tue, 02 Aug 2011) $

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

Categorize()

Method Summary

<T> TypedObjectNode[]	evaluate(T f, XPathEvaluator<T> xpathEvaluator) Determines the values of the expression for the given context object.
BufferedImage	evaluateRaster(AbstractRaster raster, RasterStyling style) Construct an image map, as the result of the Categorize operation
Color[]	getColors()
QName	getElementName() Returns the element name used for encoding this expression.
boolean	getPrecedingBelongs()
Float[]	getThreshholds()
Categorize	parse(XMLStreamReader in)
String	toString()

Methods inherited from class org.deegree.filter.expression.custom.AbstractCustomExpression

getParams, getType, parse100, parse110, parse200, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Categorize

public Categorize()

Method Detail

getElementName

public QName getElementName()

Description copied from interface: CustomExpression

Returns the element name used for encoding this expression.

Returns:

the element name of the expression, never null

evaluate

public <T> TypedObjectNode[] evaluate(T f,
                                      XPathEvaluator<T> xpathEvaluator)

Description copied from interface: Expression

Determines the values of the expression for the given context object.

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

Type Parameters:

T - type of the context object

Parameters:

f - object that the expression is evaluated upon, must not be null

xpathEvaluator - used for evaluation of XPath expressions, must not be null

Returns:

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

getThreshholds

public Float[] getThreshholds()

Returns:

the array of threshholds

getPrecedingBelongs

public boolean getPrecedingBelongs()

Returns:

true, if preceding value belongs to current category

getColors

public Color[] getColors()

Returns:

the categories' colors

evaluateRaster

public BufferedImage evaluateRaster(AbstractRaster raster,
                                    RasterStyling style)

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

Parameters:

raster - input raster

style - raster style, that contains channel mappings (if applicable)

Returns:

a buffered image with the processed data

parse

public Categorize parse(XMLStreamReader in)
                 throws XMLStreamException

Specified by:

parse in class AbstractCustomExpression

Throws:

XMLStreamException

toString

public String toString()

Overrides:

toString in class Object