Package com.singularsys.jep.functions

Class NaryFunction

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.NaryFunction

All Implemented Interfaces:

PostfixMathCommandI, Serializable

Direct Known Subclasses:

Ele, FromBase, JepTest.AddFractionsNary, JepTest.MyNary, Mid, NullWrappedNary, NullWrappedNaryBinary, Round, RoundSF, Substring, ToBase

public abstract class NaryFunction
extends PostfixMathCommand

Convenient base class for nary functions. Defines an Object eval(Object[] args) method for calculating the result.

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
NaryFunction()	Standard constructor where any number of arguments is allowed.
NaryFunction(int nArgs)	Constructor where a fixed number of arguments is allowed

Method Summary

Modifier and Type	Method	Description
abstract Object	eval(Object[] args)	Evaluate the function
void	run(Stack<Object> stack)	Creates an array of object then calls eval(Object[])

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

NaryFunction

public NaryFunction()

Standard constructor where any number of arguments is allowed. Use the PostfixMathCommand.checkNumberOfParameters(int) method to restrict the number of arguments allowed.

NaryFunction

public NaryFunction(int nArgs)

Constructor where a fixed number of arguments is allowed

Parameters:

nArgs - number of arguments allowed

Method Details

run

public void run(Stack<Object> stack)
         throws EvaluationException

Creates an array of object then calls eval(Object[])

Specified by:

run in interface PostfixMathCommandI

Overrides:

run in class PostfixMathCommand

Parameters:

stack - arguments for function

Throws:

EvaluationException - if function cannot be evaluated

eval

public abstract Object eval(Object[] args)
                     throws EvaluationException

Evaluate the function

Parameters:

args - arguments to the function

Returns:

value returned by the function

Throws:

EvaluationException - if the calculation cannot be performed