org.databene.script.expression

Class IsNullExpression

java.lang.Object

org.databene.script.expression.UnaryExpression<Boolean>

org.databene.script.expression.IsNullExpression

All Implemented Interfaces:

Expression<Boolean>, WrapperExpression<Boolean>

public class IsNullExpression
extends UnaryExpression<Boolean>

Expression that returns true, if a source expression returns null, else false.

Created: 08.10.2010 23:04:01

Since:

0.5.4

Author:

Volker Bergmann

Field Summary

Fields inherited from class org.databene.script.expression.UnaryExpression

symbol, term

Constructor Summary

Constructors

Constructor and Description
IsNullExpression(Expression<?> term)

Method Summary

Methods

Modifier and Type	Method and Description
Boolean	evaluate(org.databene.commons.Context context)
String	toString()

Methods inherited from class org.databene.script.expression.UnaryExpression

getSourceExpressions, isConstant

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNullExpression

public IsNullExpression(Expression<?> term)

Method Detail

evaluate

public Boolean evaluate(org.databene.commons.Context context)

toString

public String toString()

Overrides:

toString in class UnaryExpression<Boolean>