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## com.singularsys.jep
Interface Evaluator

All Superinterfaces:
  JepComponent, java.io.Serializable

All Known Implementing Classes:
  PostfixEvaluator, RealEvaluator, StandardEvaluator

    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
`java.lang.Object` | `eval(Node node)` Evaluates a sub expression.
`java.lang.Object` | `evaluate(Node node)` Evaluates a node and returns and object with the value of the node.

Methods inherited from interface com.singularsys.jep.JepComponent
`init`

Method Detail

### evaluate

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

  Evaluates a node and returns and object with the value of the node.

  Throws:
    `ParseException` - if errors occur during evaluation;
    `EvaluationException`

### eval

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

  Evaluates a sub expression.

  Throws:
    `ParseException` - if errors occur during evaluation;
    `EvaluationException`

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Copyright © 2007 Singular Systems http://www.singularsys.com/jep