org.jmat.function.expressionParser
Class Evaluator

java.lang.Object
  |
  +--org.jmat.function.expressionParser.Evaluator

public class Evaluator

extends java.lang.Object

Expresion parser based on The-Son LAI MathEvaluator class : Lts@writeme.com

Titre : Mathematic expression evaluator

Copyright : LGPL

Nested Class Summary

protected class	Evaluator.Node
protected class	Evaluator.Operator

Field Summary

protected static Evaluator.Operator[]

operators

Constructor Summary

Evaluator()
creates an empty MathEvaluator.

Evaluator(java.lang.String s)
creates a MathEvaluator and assign the math expression string.

Method Summary

protected static void	_D(java.lang.String s)
void	addVariable(java.lang.String v, double val) adds a variable and its value in the MathEvaluator
void	addVariable(java.lang.String v, java.lang.Double val) adds a variable and its value in the MathEvaluator
void	addVariable(java.lang.String v, Matrix val) adds a variable and its value in the MathEvaluator
protected Evaluator.Operator[]	getOperators()
java.lang.Object	getValue() evaluates and returns the value of the expression
java.lang.Object	getVariable(java.lang.String s) gets the variable's value that was assigned previously
void	reset() resets the evaluator
void	setExpression(java.lang.String s) sets the expression
void	trace() trace the binary tree for debug

Methods inherited from class java.lang.Object

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

Field Detail

operators

protected static Evaluator.Operator[] operators

Constructor Detail

Evaluator

public Evaluator()

creates an empty MathEvaluator. You need to use setExpression(String s) to assign a math expression string to it.

Evaluator

public Evaluator(java.lang.String s)

creates a MathEvaluator and assign the math expression string.

Method Detail

addVariable

public void addVariable(java.lang.String v,
                        Matrix val)

adds a variable and its value in the MathEvaluator

addVariable

public void addVariable(java.lang.String v,
                        double val)

adds a variable and its value in the MathEvaluator

addVariable

public void addVariable(java.lang.String v,
                        java.lang.Double val)

adds a variable and its value in the MathEvaluator

setExpression

public void setExpression(java.lang.String s)

sets the expression

reset

public void reset()

resets the evaluator

trace

public void trace()

trace the binary tree for debug

getValue

public java.lang.Object getValue()

evaluates and returns the value of the expression

getVariable

public java.lang.Object getVariable(java.lang.String s)

gets the variable's value that was assigned previously

getOperators

protected Evaluator.Operator[] getOperators()

_D

protected static void _D(java.lang.String s)