de.congrace.exp4j

Class CustomFunction

java.lang.Object

de.congrace.exp4j.CustomFunction

public abstract class CustomFunction
extends Object

this classed is used to create custom functions for exp4j

Example

        
 CustomFunction fooFunc = new CustomFunction("foo") {
                public double applyFunction(double value) {
                        return value*Math.E;
                }
 };
 double varX=12d;
 Calculable calc = new ExpressionBuilder("foo(x)").withCustomFunction(fooFunc).withVariable("x",varX).build();
 assertTrue(calc.calculate() == Math.E * varX);
 }

Author:

frank asseg

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CustomFunction(String name) create a new single value input CustomFunction with a set name
protected	CustomFunction(String name, int argumentCount) create a new single value input CustomFunction with a set name

Method Summary

Methods

Modifier and Type	Method and Description
abstract double	applyFunction(double... args)
int	getArgumentCount()

Methods inherited from class java.lang.Object

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

Constructor Detail

CustomFunction

protected CustomFunction(String name)
                  throws InvalidCustomFunctionException

create a new single value input CustomFunction with a set name

Parameters:

value - the name of the function (e.g. foo)

Throws:

InvalidCustomFunctionException

CustomFunction

protected CustomFunction(String name,
              int argumentCount)
                  throws InvalidCustomFunctionException

create a new single value input CustomFunction with a set name

Parameters:

value - the name of the function (e.g. foo)

Throws:

InvalidCustomFunctionException

Method Detail

getArgumentCount

public int getArgumentCount()

applyFunction

public abstract double applyFunction(double... args)