xal.tools.formula

Class FormulaInterpreter

java.lang.Object

xal.tools.formula.FormulaInterpreter

public final class FormulaInterpreter
extends java.lang.Object

FormulaInterpreter is a class used to evaluate a formula with a given set of variables provided by the user.

Constructor Summary

Constructors

Constructor and Description
FormulaInterpreter() Creates a new instance of FormulaInterpreter

Method Summary

Modifier and Type	Method and Description
void	compile(java.lang.String formula) compile the specified formula
double	evaluate() evaluate the compiled formula
double	evaluate(java.lang.String formula) Compile and evaluate the specified formula.
boolean	hasVariable(java.lang.String name) Determine if a variable of the specified name exists and has been assigned a value.
void	setVariable(java.lang.String name, double value) Set the named variable to the specified value.

Methods inherited from class java.lang.Object

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

Constructor Detail

FormulaInterpreter

public FormulaInterpreter()

Creates a new instance of FormulaInterpreter

Method Detail

setVariable

public final void setVariable(java.lang.String name,
                              double value)

Set the named variable to the specified value. Overrides the previous value (if any) of the variable.

Parameters:

name - name of the variable

value - value assigned to the variable

hasVariable

public final boolean hasVariable(java.lang.String name)

Determine if a variable of the specified name exists and has been assigned a value.

Parameters:

name - The name of the variable for which to check.

Returns:

true if the variable exists; false otherwise.

compile

public void compile(java.lang.String formula)

compile the specified formula

evaluate

public double evaluate(java.lang.String formula)

Compile and evaluate the specified formula.

Returns:

The result of evaluating the formula with the present variable values.

evaluate

public double evaluate()

evaluate the compiled formula