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Java > Open Source Codes > org > jruby > ast > NthRefNode


1 /***** BEGIN LICENSE BLOCK *****
2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
3  *
4  * The contents of this file are subject to the Common Public
5  * License Version 1.0 (the "License"); you may not use this file
6  * except in compliance with the License. You may obtain a copy of
7  * the License at http://www.eclipse.org/legal/cpl-v10.html
8  *
9  * Software distributed under the License is distributed on an "AS
10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
11  * implied. See the License for the specific language governing
12  * rights and limitations under the License.
13  *
14  * Copyright (C) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
15  * Copyright (C) 2001-2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
16  * Copyright (C) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>
17  * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
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31 package org.jruby.ast;
32
33 import java.util.List JavaDoc;
34
35 import org.jruby.ast.visitor.NodeVisitor;
36 import org.jruby.evaluator.Instruction;
37 import org.jruby.lexer.yacc.ISourcePosition;
38
39 /** Represents a $number variable.
40  *
41  * @author jpetersen
42  */
43 public class NthRefNode extends Node {
44     static final long serialVersionUID = -3301605695065934063L;
45
46     private final int matchNumber;
47
48     public NthRefNode(ISourcePosition position, int matchNumber) {
49         super(position, NodeTypes.NTHREFNODE);
50         this.matchNumber = matchNumber;
51     }
52
53     /**
54      * Accept for the visitor pattern.
55      * @param iVisitor the visitor
56      **/
57     public Instruction accept(NodeVisitor iVisitor) {
58         return iVisitor.visitNthRefNode(this);
59     }
60
61     /**
62      * Gets the matchNumber.
63      * @return Returns a int
64      */
65     public int getMatchNumber() {
66         return matchNumber;
67     }
68     
69     public List JavaDoc childNodes() {
70         return EMPTY_LIST;
71     }
72
73 }
74
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