org.openstreetmap.josm.gui.mappaint.mapcss

Class ExpressionFactory.NullExpression

java.lang.Object

org.openstreetmap.josm.gui.mappaint.mapcss.ExpressionFactory.NullExpression

All Implemented Interfaces:

Expression

Enclosing class:

ExpressionFactory

public static class ExpressionFactory.NullExpression
extends java.lang.Object
implements Expression

Expression that always evaluates to null.

Field Summary

Fields

Modifier and Type	Field and Description
static ExpressionFactory.NullExpression	INSTANCE The unique instance.

Constructor Summary

Constructors

Constructor and Description
NullExpression()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(Environment env) Evaluate this expression.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final ExpressionFactory.NullExpression INSTANCE

The unique instance.

Constructor Detail

NullExpression

public NullExpression()

Method Detail

evaluate

public java.lang.Object evaluate(Environment env)

Description copied from interface: Expression

Evaluate this expression.

Specified by:

evaluate in interface Expression

Parameters:

env - The environment

Returns:

the result of the evaluation, can be a List, String or any primitive type or wrapper classes of a primitive type.