Overview  Package   Class  Use  Deprecated  Index
Home >> All >> jmat >> function >> [ expressionParser overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

jmat.function.expressionParser
Class Evaluator  

java.lang.Object
  jmat.function.expressionParser.Evaluator

---

public class Evaluator

extends java.lang.Object

Mathematic expression evaluator. Supports the following functions: +, -, *, /, ^, %, cos, sin, tan, acos, asin, atan, sqrt, sqr, log, min, max, ceil, floor, abs, neg, rndr.
When the getValue() is called, a Double object is returned. If it returns null, an error occured.

 Sample:
 MathEvaluator m = new MathEvaluator("-5-6/(-2) + sqr(15+x)");
 m.addVariable("x", 15.1d);
 System.out.println( m.getValue() );
 

Version:

1.1

---

Nested Class Summary
protected  class	Evaluator.Node
protected  class	Evaluator.Operator

 

Field Summary
private  java.lang.String	expression
private  Evaluator.Node	node
protected static Evaluator.Operator[]	operators
private  java.util.HashMap	variables

 

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, jmat.data.Matrix val)           adds a variable and its value in the MathEvaluator
private static java.lang.Object	evaluate(Evaluator.Node n)
private static java.lang.Object	evaluateExpression1(Evaluator.Operator o, java.lang.Object o1)
private static java.lang.Object	evaluateExpression2(Evaluator.Operator o, java.lang.Object o1, java.lang.Object o2)
private  java.lang.Object	getObject(java.lang.String s)
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
private  void	init()
private  void	initializeOperators()
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

---

variables

private java.util.HashMap variables

---

node

private Evaluator.Node node

---

expression

private java.lang.String expression

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

setExpression

public void setExpression(java.lang.String s)

sets the expression

---

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

---

addVariable

public void addVariable(java.lang.String v,
                        jmat.data.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

---

reset

public void reset()

resets the evaluator

---

trace

public void trace()

trace the binary tree for debug

---

getOperators

protected Evaluator.Operator[] getOperators()

---

_D

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

---

evaluate

private static java.lang.Object evaluate(Evaluator.Node n)

---

evaluateExpression1

private static java.lang.Object evaluateExpression1(Evaluator.Operator o,
                                                    java.lang.Object o1)

---

evaluateExpression2

private static java.lang.Object evaluateExpression2(Evaluator.Operator o,
                                                    java.lang.Object o1,
                                                    java.lang.Object o2)

---

getObject

private java.lang.Object getObject(java.lang.String s)

---

init

private void init()

---

initializeOperators

private void initializeOperators()

---

Overview  Package   Class  Use  Deprecated  Index
Home >> All >> jmat >> function >> [ expressionParser overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---