com.singularsys.extensions.structure

Class StructuredEvaluator

java.lang.Object

com.singularsys.extensions.structure.StructuredEvaluator

All Implemented Interfaces:

Evaluator, JepComponent, java.io.Serializable

public class StructuredEvaluator
extends java.lang.Object
implements Evaluator

An evaluator which works with structured programming.

Since:

Jep 3.5 / Extensions 2.0

Author:

Richard Morris

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StructuredEvaluator(Evaluator rootEval) Create an evaluator for use with structured programming.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	eval(Node node) Evaluate a node.
java.lang.Object	evaluate(Node node) Main entry point, evaluates a node and returns and object with the value of the node.
JepComponent	getLightWeightInstance() Gets a light-weight instance suitable for using in multiple threads.
void	init(Jep jep) Initialize the component.

Methods inherited from class java.lang.Object

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

Constructor Detail

StructuredEvaluator

public StructuredEvaluator(Evaluator rootEval)

Create an evaluator for use with structured programming.

Parameters:

rootEval - the evaluator used for simple non-structured expressions

See Also:

StructureNode

Method Detail

evaluate

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

Evaluate a node. If the node is an instance of StructureNode call its StructureNode.eval(Evaluator) method, otherwise use the rootEvaluator.

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;

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 an new instance, or 'this'.

init

public void init(Jep jep)

Description copied from interface: JepComponent

Initialize the component. This methods 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