org.geotools.filter.function

Class DateDifferenceFunction

Object

ExpressionAbstract

DefaultExpression

FunctionExpressionImpl

DateDifferenceFunction

All Implemented Interfaces:

FunctionExpression, Factory, Expression, Function

public class DateDifferenceFunction
extends FunctionExpressionImpl

The function computes the difference between two date objects (as a-b), in the specified time unit (default to milliseconds). Supported time units are "s", "m", "h", "d" (for seconds, minutes, hours, days respectively).

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
DateDifferenceFunction()

Method Summary

Modifier and Type	Method and Description
Object	evaluate(Object feature) Subclass should override, default implementation returns null.
int	getArgCount()
String	getName() Gets the name of this function.

Methods inherited from class FunctionExpressionImpl

accept, equals, functionName, getExpression, getFallbackValue, getFunctionName, getImplementationHints, 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

NAME

public static FunctionName NAME

Constructor Detail

DateDifferenceFunction

public DateDifferenceFunction()

Method Detail

getName

public String getName()

Description copied from class: FunctionExpressionImpl

Gets the name of this function.

Specified by:

getName in interface Function

Overrides:

getName in class FunctionExpressionImpl

Returns:

the name of the function.

getArgCount

public int getArgCount()

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