org.geotools.filter.function

Class NowFunction

Object

ExpressionAbstract

DefaultExpression

FunctionExpressionImpl

NowFunction

All Implemented Interfaces:

FunctionExpression, Factory, Expression, Function

public class NowFunction
extends FunctionExpressionImpl

Return the current time as a Date. When evaluated directly, it returns a new value at each invocation. When evaluated as part of a filter against a DataStore, the value might be one, and fixed, during the data access. For example:

• If the datastore uses SimplifyingFilterVisitor, the function will be called once, and replaced with the returned value
• If the datastore encodes the function down in a native query language, the value could also be the same for all processed features. For example, the PostgreSQL now function always returns the time at the beginning of the current transaction, to give a consistent notion of current time across it.

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
NowFunction()

Method Summary

Modifier and Type	Method and Description
Object	evaluate(Object object) Subclass should override, default implementation returns null.
String	toString() Creates a String representation of this Function with the function name and the arguments.

Methods inherited from class FunctionExpressionImpl

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

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

NowFunction

public NowFunction()

Method Detail

toString

public String toString()

Description copied from class: FunctionExpressionImpl

Creates a String representation of this Function with the function name and the arguments. The String created should be good for most subclasses

Overrides:

toString in class FunctionExpressionImpl

evaluate

public Object evaluate(Object object)

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