net.christopherschultz.evaluator.function
Class Difference

java.lang.Object
  net.christopherschultz.evaluator.StandardFunction
      net.christopherschultz.evaluator.function.MathFunction
          net.christopherschultz.evaluator.function.Difference

All Implemented Interfaces:

Function

public class Difference
extends MathFunction

Implements numeric subtraction. This function takes any number of arguments and returns the arithmetic difference between them. No arguments returns zero. One argument returns the negavite of that argument. More than one argument returns the first argument with each of the remaining arguments subtracted from it. The following data types are supported: byte, short, int, long, float, and double. The return type is chosen based upon the widest-typed argument passed into the function. The types are listed above from narrowest to widest.

Version:

$Revision: 1.2 $ $Date: 2008-06-20 22:58:48 $

Author:

Chris Schultz

Nested Class Summary

Nested classes/interfaces inherited from class net.christopherschultz.evaluator.function.MathFunction

MathFunction.abs, MathFunction.acos, MathFunction.asin, MathFunction.atan, MathFunction.ceil, MathFunction.cos, MathFunction.DoubleFunction, MathFunction.exp, MathFunction.floor, MathFunction.heaviside, MathFunction.log, MathFunction.max, MathFunction.min, MathFunction.pow, MathFunction.random, MathFunction.rint, MathFunction.sin, MathFunction.sqrt, MathFunction.tan, MathFunction.toDegrees, MathFunction.toRadians

Field Summary

Fields inherited from class net.christopherschultz.evaluator.function.MathFunction

ALLOW_NULL_COMPARISON, NULL_RETURNS_NULL

Constructor Summary

Difference()

Method Summary

Object

call(EvaluationContext ec, String functionName, Object[] arguments) Calls this function with standard argument evaluation semantics.

Methods inherited from class net.christopherschultz.evaluator.StandardFunction

call, getExpressionValue, getExpressionValueArray, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Difference

public Difference()

Method Detail

call

public Object call(EvaluationContext ec,
                   String functionName,
                   Object[] arguments)
            throws EvaluationException

Description copied from class: StandardFunction

Calls this function with standard argument evaluation semantics.

Specified by:

call in class StandardFunction

Parameters:

ec - The EvaluationContext in which this function is being called.

functionName - The name of the function being invoked.

arguments - The argument values to pass to this function.

Returns:

The result of the function.

Throws:

EvaluationException - If there is an error during function execution.