Package com.singularsys.jep.reals

Class RealEvaluator

java.lang.Object

com.singularsys.jep.reals.RealEvaluator

All Implemented Interfaces:

Evaluator, JepComponent, Serializable

public class RealEvaluator
extends Object
implements Evaluator

Performs fast evaluation of expressions by using primitive types double and boolean instead of objects.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
RealEvaluator()

Method Summary

Modifier and Type	Method	Description
Object	eval(Node node)	Evaluates a sub expression.
Object	evaluate(Node node)	Main entry point, evaluates a node and returns and object with the value of the node.
protected static double	fromObject(Object o)
JepComponent	getLightWeightInstance()	Gets a light-weight instance suitable for using in multiple threads.
void	init(Jep jep)	Initialize the component.
protected double	visit(Node node)
protected double[]	visitChildren(ASTFunNode node)
protected double	visitConstant(ASTConstant node)
protected double	visitFunction(ASTFunNode node)
protected double	visitVariable(ASTVarNode node)

Methods inherited from class java.lang.Object

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

Constructor Details

RealEvaluator

public RealEvaluator()

Method Details

evaluate

public Object evaluate(Node node)
                throws EvaluationException

Description copied from interface: Evaluator

Main entry point, evaluates a node and returns and object with the value of the node.

Specified by:

evaluate in interface Evaluator

Parameters:

node - node to evaluate

Returns:

value after evaluation

Throws:

EvaluationException - if errors occur during evaluation;

eval

public Object eval(Node node)
            throws EvaluationException

Description copied from interface: Evaluator

Evaluates a sub expression. This method can be called by PostfixMathCommands which implement CallbackEvaluationI

Specified by:

eval in interface Evaluator

Parameters:

node - node to evaluate

Returns:

The value after evaluating the sub expression.

Throws:

EvaluationException - if errors occur during evaluation;

init

public void init(Jep jep)

Description copied from interface: JepComponent

Initialize the component. This method is called whenever a component is added to Jep. Hence, it allows components to keep track of the other components they may rely on.

Specified by:

init in interface JepComponent

Parameters:

jep - the current Jep instance

visit

protected double visit(Node node)
                throws EvaluationException

Throws:

EvaluationException

visitChildren

protected double[] visitChildren(ASTFunNode node)
                          throws EvaluationException

Throws:

EvaluationException

visitFunction

protected double visitFunction(ASTFunNode node)
                        throws EvaluationException

Throws:

EvaluationException

visitVariable

protected double visitVariable(ASTVarNode node)
                        throws EvaluationException

Throws:

EvaluationException

visitConstant

protected double visitConstant(ASTConstant node)
                        throws EvaluationException

Throws:

EvaluationException

fromObject

protected static double fromObject(Object o)
                            throws EvaluationException

Throws:

EvaluationException

getLightWeightInstance

public JepComponent getLightWeightInstance()

Description copied from interface: JepComponent

Gets a light-weight instance suitable for using in multiple threads.

Specified by:

getLightWeightInstance in interface JepComponent

Returns:

either a new instance, null or 'this'.