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Java > Open Source Codes > org > nfunk > jep > function > SpecialEvaluationI


1 /* @author rich
2  * Created on 18-Nov-2003
3  *
4  * This code is covered by a Creative Commons
5  * Attribution, Non Commercial, Share Alike license
6  * <a HREF="http://creativecommons.org/licenses/by-nc-sa/1.0">License</a>
7  */
8 package org.nfunk.jep.function;
9 import org.nfunk.jep.*;
10 import java.util.Stack JavaDoc;
11 /**
12  * Functions which require greater control over their evaluation should implement this interface.
13  *
14  * @author Rich Morris
15  * Created on 18-Nov-2003
16  */
17 public interface SpecialEvaluationI {
18
19     /**
20      * Performs some special evaluation on the node.
21      * This method has the responsability for evaluating the children of the node
22      * and it should generally call
23      * <pre>
24      * node.jjtGetChild(i).jjtAccept(pv,data);
25      * </pre>
26      * for each child.
27      *
28      * @param node The current node
29      * @param data The data passed to visitor, typically not used
30      * @param pv The visitor, can be used evaluate the children
31      * @param stack The stack of the evaluator
32      * @param symTab The symbol table
33      * @return the value after evaluation
34      * @throws ParseException
35      */
36     public Object JavaDoc evaluate(Node node,Object JavaDoc data,ParserVisitor pv,Stack JavaDoc stack/*,SymbolTable symTab*/) throws ParseException;
37 }
38
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