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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>
18  *
19  * Alternatively, the contents of this file may be used under the terms of
20  * either of the GNU General Public License Version 2 or later (the "GPL"),
21  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
22  * in which case the provisions of the GPL or the LGPL are applicable instead
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30  ***** END LICENSE BLOCK *****/
31 package org.jruby.ast;
32
33 import java.util.List JavaDoc;
34
35 import org.jruby.ast.types.INameNode;
36 import org.jruby.ast.visitor.NodeVisitor;
37 import org.jruby.evaluator.Instruction;
38 import org.jruby.lexer.yacc.ISourcePosition;
39
40 /**
41  *
42  * @author jpetersen
43  */
44 public class NilNode extends Node implements INameNode {
45     static final long serialVersionUID = -8702073984472296708L;
46
47     public NilNode(ISourcePosition position) {
48         super(position, NodeTypes.NILNODE);
49     }
50
51     /**
52      * Accept for the visitor pattern.
53      * @param iVisitor the visitor
54      **/
55     public Instruction accept(NodeVisitor iVisitor) {
56         return iVisitor.visitNilNode(this);
57     }
58     
59     /**
60      * Name of nil node.
61      **/
62     public String JavaDoc getName() {
63         return "nil";
64     }
65     
66     public List JavaDoc childNodes() {
67         return EMPTY_LIST;
68     }
69
70 }
71
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