org.apache.cocoon.forms.expression
Class IsNullFunction

java.lang.Object
  extended byorg.outerj.expression.AbstractExpression
      extended byorg.apache.cocoon.forms.expression.IsNullFunction
All Implemented Interfaces:
org.outerj.expression.Expression

public class IsNullFunction
extends org.outerj.expression.AbstractExpression

Returns true if argument is null.

Version:
$Id: IsNullFunction.html 1304280 2012-03-23 11:18:01Z ilgrosso $

Field Summary
 
Fields inherited from class org.outerj.expression.AbstractExpression
arguments, column, line
 
Constructor Summary
IsNullFunction()
           
 
Method Summary
 void check()
           
 Object evaluate(org.outerj.expression.ExpressionContext context)
           
 String getDescription()
           
 Class getResultType()
           
 
Methods inherited from class org.outerj.expression.AbstractExpression
addArgument, addArgument, checkArgument, checkArguments, checkArgumentsOfSameType, checkNoArguments, getColumn, getLine, setPosition
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

IsNullFunction

public IsNullFunction()
Method Detail

evaluate

public Object evaluate(org.outerj.expression.ExpressionContext context)
                throws org.outerj.expression.ExpressionException
Throws:
org.outerj.expression.ExpressionException

check

public void check()
           throws org.outerj.expression.ExpressionException
Throws:
org.outerj.expression.ExpressionException

getResultType

public Class getResultType()

getDescription

public String getDescription()


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