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


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"),
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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 /** An AliasNode represents an alias statement.
41  * ast node for the
42  * <code>alias newName oldName</code>
43  * @author jpetersen
44  */
45 public class AliasNode extends Node {
46     static final long serialVersionUID = -498707070925086399L;
47
48     private String JavaDoc oldName;
49     private String JavaDoc newName;
50
51     public AliasNode(ISourcePosition position, String JavaDoc newName, String JavaDoc oldName) {
52         super(position, NodeTypes.ALIASNODE);
53         this.oldName = oldName.intern();
54         this.newName = newName.intern();
55     }
56     
57     private void readObject(java.io.ObjectInputStream JavaDoc in) throws IOException JavaDoc, ClassNotFoundException JavaDoc {
58         in.defaultReadObject();
59         
60         // deserialized strings are not interned; intern it now
61 oldName = oldName.intern();
62         newName = newName.intern();
63     }
64
65     /**
66      * Accept for the visitor pattern.
67      * @param iVisitor the visitor
68      **/
69     public Instruction accept(NodeVisitor iVisitor) {
70         return iVisitor.visitAliasNode(this);
71     }
72
73     /**
74      * Gets the newName.
75      * @return the newName as in the alias statement : <code> alias <b>newName</b> oldName </code>
76      */
77     public String JavaDoc getNewName() {
78         return newName;
79     }
80
81     /**
82      * Gets the oldName.
83      * @return the oldName as in the alias statement : <code> alias newName <b>oldName</b></code>
84      */
85     public String JavaDoc getOldName() {
86         return oldName;
87     }
88     
89     public List JavaDoc childNodes() {
90         return EMPTY_LIST;
91     }
92
93 }
94
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