Package com.singularsys.jep.misc.nullwrapper.functions

Class NullWrappedNary

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.NaryFunction

com.singularsys.jep.misc.nullwrapper.functions.NullWrappedNary

All Implemented Interfaces:

NullWrappedFunctionI, PostfixMathCommandI, java.io.Serializable

public class NullWrappedNary
extends NaryFunction
implements NullWrappedFunctionI

Wrap an NaryFunction with a new function so that if any argument is null null is returned.

Since:

3.4

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
NullWrappedNary(NaryFunction fun)

Method Summary

Modifier and Type	Method	Description
boolean	checkNumberOfParameters(int n)	Checks the number of parameters of the function.
java.lang.Object	eval(java.lang.Object[] args)	Evaluate the function
int	getNumberOfParameters()	Return the required number of parameters.
PostfixMathCommandI	getRoot()	Get to function which this function wraps.
void	setCurNumberOfParameters(int n)	Sets the number of current number of parameters used in the next call of run().
void	setName(java.lang.String name)	Sets the name of the function used for error messages

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

run

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

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, getName, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

NullWrappedNary

public NullWrappedNary(NaryFunction fun)

Parameters:

fun -

Method Detail

getRoot

public PostfixMathCommandI getRoot()

Description copied from interface: NullWrappedFunctionI

Get to function which this function wraps.

Specified by:

getRoot in interface NullWrappedFunctionI

Returns:

the root function, may be "this".

eval

public java.lang.Object eval(java.lang.Object[] args)
                      throws EvaluationException

Description copied from class: NaryFunction

Evaluate the function

Specified by:

eval in class NaryFunction

Parameters:

args - arguments to the function

Returns:

value returned by the function

Throws:

EvaluationException - if the calculation cannot be performed

setName

public void setName(java.lang.String name)

Description copied from interface: PostfixMathCommandI

Sets the name of the function used for error messages

Specified by:

setName in interface PostfixMathCommandI

Overrides:

setName in class PostfixMathCommand

Parameters:

name - the function name

checkNumberOfParameters

public boolean checkNumberOfParameters(int n)

Description copied from class: PostfixMathCommand

Checks the number of parameters of the function. Functions which set numberOfParameter=-1 should overload this method

Specified by:

checkNumberOfParameters in interface PostfixMathCommandI

Overrides:

checkNumberOfParameters in class PostfixMathCommand

Parameters:

n - number of parameters function will be called with.

Returns:

false if an illegal number of parameters is supplied, true otherwise.

getNumberOfParameters

public int getNumberOfParameters()

Description copied from class: PostfixMathCommand

Return the required number of parameters.

Specified by:

getNumberOfParameters in interface PostfixMathCommandI

Overrides:

getNumberOfParameters in class PostfixMathCommand

Returns:

allowable number of parameters, -1 if a variable number is allowed

setCurNumberOfParameters

public void setCurNumberOfParameters(int n)

Description copied from class: PostfixMathCommand

Sets the number of current number of parameters used in the next call of run(). This method is only called when the reqNumberOfParameters is -1.

Specified by:

setCurNumberOfParameters in interface PostfixMathCommandI

Overrides:

setCurNumberOfParameters in class PostfixMathCommand

Parameters:

n - number of parameter for next call of function