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Java Source Code / Java Documentation » Library » Apache commons scxml 0.6 src » org.apache.commons.scxml

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Class Diagram

Java Document (Java Doc)

org.apache.commons.scxml .Evaluator

All known Subclasses:   org.apache.commons.scxml.env.jsp .ELEvaluator,  org.apache.commons.scxml.env.jexl .JexlEvaluator,
Evaluator
public interface Evaluator (Code)
Interface for a component that may be used by the SCXML engines to evaluate the expressions within the SCXML document.

Method Summary
Object eval(Context ctx, String expr)
     Evaluate an expression.
Boolean evalCond(Context ctx, String expr)
     Evaluate a condition.
Node evalLocation(Context ctx, String expr)
     Evaluate a location that returns a Node within an XML data tree.
Context newContext(Context parent)
     Create a new child context.

Method Detail
eval
Object eval(Context ctx, String expr) throws SCXMLExpressionException(Code)
Evaluate an expression.
Parameters:
  ctx - variable context
Parameters:
  expr - expression a result of the evaluation
throws:
  SCXMLExpressionException - A malformed exception

evalCond
Boolean evalCond(Context ctx, String expr) throws SCXMLExpressionException(Code)
Evaluate a condition. Manifests as "cond" attributes of <transition>, <if> and <elseif> elements.
Parameters:
  ctx - variable context
Parameters:
  expr - expression true/false
throws:
  SCXMLExpressionException - A malformed exception

evalLocation
Node evalLocation(Context ctx, String expr) throws SCXMLExpressionException(Code)
Evaluate a location that returns a Node within an XML data tree. Manifests as "location" attributes of <assign> element.
Parameters:
  ctx - variable context
Parameters:
  expr - expression The location node.
throws:
  SCXMLExpressionException - A malformed exception

newContext
Context newContext(Context parent)(Code)
Create a new child context.
Parameters:
  parent - parent context new child context

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