net.christopherschultz.evaluator.function
Class IsNullFunction

java.lang.Object
  extended by net.christopherschultz.evaluator.StandardFunction
      extended by net.christopherschultz.evaluator.function.IsNullFunction
All Implemented Interfaces:
Function

public class IsNullFunction
extends StandardFunction

Returns true if all arguments are null.

This method will typically take a single argument, but you may invoke it with an arbitrary number of arguments. true is returned if all arguments are null.

Version:
$Revision: 1.2 $ $Date: 2008-06-20 22:58:48 $
Author:
Chris Schultz

Constructor Summary
IsNullFunction()
           
 
Method Summary
 Object call(EvaluationContext ec, String functionName, Object[] arguments)
          Calls this function with standard argument evaluation semantics.
 
Methods inherited from class net.christopherschultz.evaluator.StandardFunction
call, getExpressionValue, getExpressionValueArray, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

IsNullFunction

public IsNullFunction()
Method Detail

call

public Object call(EvaluationContext ec,
                   String functionName,
                   Object[] arguments)
            throws EvaluationException
Description copied from class: StandardFunction
Calls this function with standard argument evaluation semantics.

Specified by:
call in class StandardFunction
Parameters:
ec - The EvaluationContext in which this function is being called.
functionName - The name of the function being invoked.
arguments - The argument values to pass to this function.
Returns:
The result of the function.
Throws:
EvaluationException - If there is an error during function execution.