01: /***** BEGIN LICENSE BLOCK *****
02: * Version: CPL 1.0/GPL 2.0/LGPL 2.1
03: *
04: * The contents of this file are subject to the Common Public
05: * License Version 1.0 (the "License"); you may not use this file
06: * except in compliance with the License. You may obtain a copy of
07: * the License at http://www.eclipse.org/legal/cpl-v10.html
08: *
09: * 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
23: * of those above. If you wish to allow use of your version of this file only
24: * under the terms of either the GPL or the LGPL, and not to allow others to
25: * use your version of this file under the terms of the CPL, indicate your
26: * decision by deleting the provisions above and replace them with the notice
27: * and other provisions required by the GPL or the LGPL. If you do not delete
28: * the provisions above, a recipient may use your version of this file under
29: * the terms of any one of the CPL, the GPL or the LGPL.
30: ***** END LICENSE BLOCK *****/package org.jruby.ast;
31:
32: import java.io.IOException;
33: import java.util.List;
34:
35: import org.jruby.ast.visitor.NodeVisitor;
36: import org.jruby.evaluator.Instruction;
37: import org.jruby.lexer.yacc.ISourcePosition;
38:
39: /** Represents an alias of a global variable.
40: *
41: * @author jpetersen
42: */
43: public class VAliasNode extends Node {
44: static final long serialVersionUID = 8647860367861922838L;
45:
46: private String oldName;
47: private String newName;
48:
49: public VAliasNode(ISourcePosition position, String newName,
50: String oldName) {
51: super (position, NodeTypes.VALIASNODE);
52: this .oldName = oldName.intern();
53: this .newName = newName.intern();
54: }
55:
56: private void readObject(java.io.ObjectInputStream in)
57: throws IOException, ClassNotFoundException {
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.visitVAliasNode(this );
71: }
72:
73: /**
74: * Gets the newName.
75: * @return Returns a String
76: */
77: public String getNewName() {
78: return newName;
79: }
80:
81: /**
82: * Gets the oldName.
83: * @return Returns a String
84: */
85: public String getOldName() {
86: return oldName;
87: }
88:
89: public List childNodes() {
90: return EMPTY_LIST;
91: }
92:
93: }
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