io.starter.formats.XLS.formulas

Class FormulaCalculator

java.lang.Object

io.starter.formats.XLS.formulas.FormulaCalculator

public class FormulaCalculator
extends Object

Formula Calculator. Translates an excel calc stack into a value. The stack is in a modified reverse polish notation. For details please look into the Excel 97 reference for BIFF8. Formula Calculators do not exist per formula, rather it uses a factory pattern. Put a formula in & calculate it. Actual calculation methods exist within the OperatorPtg's themselves, so this just handles the grunt work of parsing and passing ptgs back and forth along with formatting the output.

See Also:

Formula

Constructor Summary

Constructors

Constructor and Description
FormulaCalculator()

Method Summary

Modifier and Type	Method and Description
static Object	calculateFormula(Stack expression) Calculates the value of calcStac This is handled by running through the stack, adding operands to tempstack until an operator PTG is found.
static Ptg	calculateFormulaPtg(Stack expression) Calculates the final Ptg result of calcStack.

Methods inherited from class java.lang.Object

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

Constructor Detail

FormulaCalculator

public FormulaCalculator()

Method Detail

calculateFormula

public static Object calculateFormula(Stack expression)
                               throws FunctionNotSupportedException

Calculates the value of calcStac This is handled by running through the stack, adding operands to tempstack until an operator PTG is found. At that point pass the relevant ptg's from tempstack into the calculate method of the operator PTG. The operator ptg should return a valid value PTG.

Throws:

FunctionNotSupportedException

calculateFormulaPtg

public static Ptg calculateFormulaPtg(Stack expression)
                               throws FunctionNotSupportedException

Calculates the final Ptg result of calcStack. This is handled by running through the stack, adding operands to tempstack until an operator PTG is found. At that point pass the relevant ptg's from tempstack into the calculate method of the operator PTG. The operator ptg should return a valid value PTG.

Throws:

FunctionNotSupportedException