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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) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
15  * Copyright (C) 2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
16  * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
17  * Copyright (C) 2004-2005 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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28  * the provisions above, a recipient may use your version of this file under
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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.visitor.NodeVisitor;
36 import org.jruby.evaluator.Instruction;
37 import org.jruby.lexer.yacc.ISourcePosition;
38 import org.jruby.runtime.Arity;
39
40 /**
41  *
42  * @author jpetersen
43  */
44 public class MultipleAsgnNode extends AssignableNode {
45     static final long serialVersionUID = 5016291105152162748L;
46
47     private final ListNode headNode;
48     private final Node argsNode;
49
50     public MultipleAsgnNode(ISourcePosition position, ListNode headNode, Node argsNode) {
51         super(position, NodeTypes.MULTIPLEASGNNODE);
52         this.headNode = headNode;
53         this.argsNode = argsNode;
54     }
55
56     /**
57      * Accept for the visitor pattern.
58      * @param iVisitor the visitor
59      **/
60     public Instruction accept(NodeVisitor iVisitor) {
61         return iVisitor.visitMultipleAsgnNode(this);
62     }
63
64     /**
65      * Gets the argsNode.
66      * @return Returns a INode
67      */
68     public Node getArgsNode() {
69         return argsNode;
70     }
71
72     /**
73      * Gets the headNode.
74      * @return Returns a ListNode
75      */
76     public ListNode getHeadNode() {
77         return headNode;
78     }
79     
80     /**
81      * Number of arguments is dependent on headNodes size
82      */
83     public Arity getArity() {
84         if (argsNode != null) {
85             return Arity.required(headNode == null ? 0 : headNode.size());
86         }
87         
88         return Arity.fixed(headNode.size());
89     }
90     
91     public List JavaDoc childNodes() {
92         return Node.createList(headNode, argsNode, getValueNode());
93     }
94
95 }
96
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