org.geotools.filter.function

Class MapGetFunction

Object

ExpressionAbstract

DefaultExpression

FunctionExpressionImpl

MapGetFunction

All Implemented Interfaces:

FunctionExpression, Factory, Expression, Function, VolatileFunction

public class MapGetFunction
extends FunctionExpressionImpl
implements VolatileFunction

Extracts a value from a map given the map name and the needed key as parameters

Field Summary

Fields

Modifier and Type	Field and Description
static FunctionName	NAME

Fields inherited from class FunctionExpressionImpl

fallback, functionName, name, params

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor and Description
MapGetFunction()

Method Summary

Modifier and Type	Method and Description
Object	evaluate(Object feature) Subclass should override, default implementation returns null.
<T> T	evaluate(Object object, Class<T> context) Default implementation delegates handling of context conversion to Converters utility class.

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 Object

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

Methods inherited from interface Function

getFallbackValue, getFunctionName, getName, getParameters

Methods inherited from interface Expression

accept

Field Detail

NAME

public static FunctionName NAME

Constructor Detail

MapGetFunction

public MapGetFunction()

Method Detail

evaluate

public <T> T evaluate(Object object,
                      Class<T> context)

Description copied from class: ExpressionAbstract

Default implementation delegates handling of context conversion to Converters utility class.

Subclasses are expected to make use of the Converters utility class (as the easiest way to provide value morphing in conformance with the Filter specification).

Specified by:

evaluate in interface Expression

Overrides:

evaluate in class ExpressionAbstract

Type Parameters:

T - The type of the returned object.

Parameters:

object - The object to evaluate the expression against.

context - The type of the resulting value of the expression.

Returns:

Evaluates the given expression based on the content of the given object an an instance of context.

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