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, 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
Object	eval(Object arg)	Evaluate the function

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 Details

IsNull

public IsNull()

Method Details

eval

public Object eval(Object arg)

Description copied from class: UnaryFunction

Evaluate the function

Specified by:

eval in class UnaryFunction

Parameters:

arg - the single argument passed in

Returns:

the result of the function