KickJava   Java API By Example, From Geeks To Geeks.

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


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) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
17  * Copyright (C) 2004-2006 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 *****/
31 package org.jruby.ast;
32
33 import java.io.IOException JavaDoc;
34 import java.util.List JavaDoc;
35
36 import org.jruby.ast.types.INameNode;
37 import org.jruby.ast.visitor.NodeVisitor;
38 import org.jruby.evaluator.Instruction;
39 import org.jruby.lexer.yacc.ISourcePosition;
40
41 /**
42  * An assignment to a dynamic variable (e.g. block scope local variable).
43  */
44 public class DAsgnNode extends AssignableNode implements INameNode {
45     static final long serialVersionUID = 2396008643154044043L;
46
47     // The name of the variable
48 private String JavaDoc name;
49     
50     // A scoped location of this variable (high 16 bits is how many scopes down and low 16 bits
51 // is what index in the right scope to set the value.
52 private int location;
53
54     public DAsgnNode(ISourcePosition position, String JavaDoc name, int location, Node valueNode) {
55         super(position, NodeTypes.DASGNNODE);
56         this.name = name.intern();
57         this.location = location;
58         setValueNode(valueNode);
59     }
60     
61     private void readObject(java.io.ObjectInputStream JavaDoc in) throws IOException JavaDoc, ClassNotFoundException JavaDoc {
62         in.defaultReadObject();
63         
64         // deserialized strings are not interned; intern it now
65 name = name.intern();
66     }
67
68     /**
69      * Accept for the visitor pattern.
70      * @param iVisitor the visitor
71      **/
72     public Instruction accept(NodeVisitor iVisitor) {
73         return iVisitor.visitDAsgnNode(this);
74     }
75     
76     /**
77      * Gets the name.
78      * @return Returns a String
79      */
80     public String JavaDoc getName() {
81         return name;
82     }
83
84     /**
85      * How many scopes should we burrow down to until we need to set the block variable value.
86      *
87      * @return 0 for current scope, 1 for one down, ...
88      */
89     public int getDepth() {
90         return location >> 16;
91     }
92     
93     /**
94      * Gets the index within the scope construct that actually holds the eval'd value
95      * of this local variable
96      *
97      * @return Returns an int offset into storage structure
98      */
99     public int getIndex() {
100         return location & 0xffff;
101     }
102     
103     public List JavaDoc childNodes() {
104         return createList(getValueNode());
105     }
106
107     public void setName(String JavaDoc name) {
108         this.name = name;
109     }
110
111 }
112
Popular Tags