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


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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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"),
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30  ***** END LICENSE BLOCK *****/
31 package org.jruby.ast;
32
33 import java.io.IOException JavaDoc;
34 import java.util.List JavaDoc;
35
36 import org.jruby.ast.visitor.NodeVisitor;
37 import org.jruby.evaluator.Instruction;
38 import org.jruby.lexer.yacc.ISourcePosition;
39
40 /** Represents an undef statement.
41  *
42  * @author jpetersen
43  */
44 public class UndefNode extends Node {
45     static final long serialVersionUID = -8829084073375820727L;
46
47     private String JavaDoc name;
48
49     public UndefNode(ISourcePosition position, String JavaDoc name) {
50         super(position, NodeTypes.UNDEFNODE);
51         this.name = name.intern();
52     }
53     
54     private void readObject(java.io.ObjectInputStream JavaDoc in) throws IOException JavaDoc, ClassNotFoundException JavaDoc {
55         in.defaultReadObject();
56         
57         // deserialized strings are not interned; intern it now
58 name = name.intern();
59     }
60
61     /**
62      * Accept for the visitor pattern.
63      * @param iVisitor the visitor
64      **/
65     public Instruction accept(NodeVisitor iVisitor) {
66         return iVisitor.visitUndefNode(this);
67     }
68
69     /**
70      * Gets the name.
71      * @return Returns a String
72      */
73     public String JavaDoc getName() {
74         return name;
75     }
76     
77     public List JavaDoc childNodes() {
78         return EMPTY_LIST;
79     }
80 }
81
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