org.nfunk.jep.function
Interface SpecialEvaluationI

All Known Implementing Classes:

Assign, Diff, If, SumType

public interface SpecialEvaluationI

Functions which require greater control over their evaluation should implement this interface.

Author:

Rich Morris Created on 18-Nov-2003

Method Summary

java.lang.Object

evaluate(Node node, java.lang.Object data, ParserVisitor pv, java.util.Stack stack) Performs some special evaluation on the node.

Method Detail

evaluate

public java.lang.Object evaluate(Node node,
                                 java.lang.Object data,
                                 ParserVisitor pv,
                                 java.util.Stack stack)
                          throws ParseException

Performs some special evaluation on the node. This method has the responsability for evaluating the children of the node and it should generally call

 node.jjtGetChild(i).jjtAccept(pv,data);	
 

for each child.

Parameters:

node - The current node

data - The data passed to visitor, typically not used

pv - The visitor, can be used evaluate the children

stack - The stack of the evaluator

Returns:

the value after evaluation

Throws:

ParseException