Package com.singularsys.jep

Interface Evaluator

All Superinterfaces:

JepComponent, java.io.Serializable

All Known Implementing Classes:

FastEvaluator, FastEvaluator3_4, FastEvaluator3_5, PostfixEvaluator, RealEvaluator, RpEvaluator, StackCheckingFastEvaluator, StandardEvaluator, StructuredEvaluator, ThreadSafeEvaluator, UncheckedEvaluator, XEvaluator

public interface Evaluator
extends JepComponent

Defines a method which can be used to evaluate a part of a node-tree. It is passed to classes which use CallbackEvaluatorI which need greater control over how they are evaluated.

Author:

Rich Morris Created on 22-Apr-2005

See Also:

CallbackEvaluationI

Method Summary

Modifier and Type	Method	Description
java.lang.Object	eval(Node node)	Evaluates a sub expression.
java.lang.Object	evaluate(Node node)	Main entry point, evaluates a node and returns and object with the value of the node.

Methods inherited from interface com.singularsys.jep.JepComponent

getLightWeightInstance, init

Method Detail

evaluate

java.lang.Object evaluate(Node node)
                   throws EvaluationException

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

Parameters:

node - node to evaluate

Returns:

value after evaluation

Throws:

EvaluationException - if errors occur during evaluation;

eval

java.lang.Object eval(Node node)
               throws EvaluationException

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

Parameters:

node - node to evaluate

Returns:

The value after evaluating the sub expression.

Throws:

EvaluationException - if errors occur during evaluation;