Package org.geotools.filter.function

Class NorthFix

Object

ExpressionAbstract

DefaultExpression

FunctionExpressionImpl

NorthFix

All Implemented Interfaces:

Expression, Function, SimplifiableFunction, FunctionExpression, Factory

public class NorthFix
extends FunctionExpressionImpl
implements SimplifiableFunction

Function that allows correcting a heading angle based on the north direction in the point and CRS provided. Useful to perform mapping with vectors (wind, currents) on CRSs that do not typically have the north up (e.g. Polar Stereographic).

Field Summary

Fields

Modifier and Type	Field	Description
static Parameter<Double>	ANGLE
static int	FULL_CIRCLE
static String	FUNCTION_NAME
static FunctionName	NAME
static Parameter<Point>	POINT
static Parameter<Double>	RESULT
static Parameter<CoordinateReferenceSystem>	SOURCE_CRS
static Parameter<CoordinateReferenceSystem>	TARGET_CRS

Fields inherited from class FunctionExpressionImpl

fallback, functionName, name, params

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor	Description
NorthFix()

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Object feature)	Subclass should override, default implementation returns null.
Expression	simplify(FilterFactory ff, FeatureType featureType)	Returns a simplified version of the function, or the function itself it cannot be be simplified

Methods inherited from class FunctionExpressionImpl

accept, equals, functionName, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, hashCode, setFallbackValue, setParameters, toString

Methods inherited from class DefaultExpression

isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression

Methods inherited from class ExpressionAbstract

evaluate

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Expression

evaluate

Field Detail

FUNCTION_NAME

public static final String FUNCTION_NAME

See Also:

Constant Field Values

RESULT

public static final Parameter<Double> RESULT

TARGET_CRS

public static final Parameter<CoordinateReferenceSystem> TARGET_CRS

POINT

public static final Parameter<Point> POINT

ANGLE

public static final Parameter<Double> ANGLE

SOURCE_CRS

public static final Parameter<CoordinateReferenceSystem> SOURCE_CRS

FULL_CIRCLE

public static final int FULL_CIRCLE

See Also:

Constant Field Values

NAME

public static FunctionName NAME

Constructor Detail

NorthFix

public NorthFix()

Method Detail

evaluate

public Object evaluate(Object feature)

Description copied from class: ExpressionAbstract

Subclass should override, default implementation returns null.

Specified by:

evaluate in interface Expression

Overrides:

evaluate in class FunctionExpressionImpl

Returns:

default implementation returns null

simplify

public Expression simplify(FilterFactory ff,
                           FeatureType featureType)

Description copied from interface: SimplifiableFunction

Returns a simplified version of the function, or the function itself it cannot be be simplified

Specified by:

simplify in interface SimplifiableFunction

Parameters:

ff - The filter factory to use for creating new expressions (mandatory, non null)

featureType - The target feature type, if available, null otherwise

Returns:

The simplified expression