Package com.singularsys.jep.misc.functions

Class IsNull

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.UnaryFunction

com.singularsys.jep.misc.functions.IsNull

All Implemented Interfaces:

NullWrappedPassThroughFunction, PostfixMathCommandI, java.io.Serializable

public class IsNull
extends UnaryFunction
implements NullWrappedPassThroughFunction

Tests if a null value is encountered. The result is true if the argument is null, false otherwise.

Author:

Richard Morris

See Also:

Serialized Form

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
IsNull()

Method Summary

Modifier and Type	Method	Description
java.lang.Object	eval(java.lang.Object arg)

Methods inherited from class com.singularsys.jep.functions.UnaryFunction

instanceOf, instanceOf, run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNull

public IsNull()

Method Detail

eval

public java.lang.Object eval(java.lang.Object arg)
                      throws EvaluationException

Specified by:

eval in class UnaryFunction

Throws:

EvaluationException