forked from jruby/jruby
-
Notifications
You must be signed in to change notification settings - Fork 0
/
MetaClass.java
78 lines (67 loc) · 3.11 KB
/
MetaClass.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the CPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.collections.SinglyLinkedList;
public class MetaClass extends RubyClass {
public MetaClass(IRuby runtime, RubyClass superClass, SinglyLinkedList parentCRef) {
super(runtime, runtime.getClass("Class"), superClass, parentCRef, null);
}
public boolean isSingleton() {
return true;
}
protected RubyClass subclass() {
throw getRuntime().newTypeError("can't make subclass of virtual class");
}
public void attachToObject(IRubyObject object) {
setInstanceVariable("__attached__", object);
}
public String getName() {
return "#<Class:" + getInstanceVariable("__attached__").toString() + ">";
}
/**
* If an object uses an anonymous class 'class << obj', then this grabs the original
* metaclass and not the one that get injected as a result of 'class << obj'.
*/
public RubyClass getRealClass() {
return getSuperClass().getRealClass();
}
public void methodAdded(RubySymbol symbol) {
getAttachedObject().callMethod(getRuntime().getCurrentContext(), "singleton_method_added", symbol);
}
public IRubyObject getAttachedObject() {
// Though it may not be obvious, attachToObject is always called just after instance
// creation. Kind of a brittle arrangement here...
return getInstanceVariable("__attached__");
}
public IRubyObject allocateObject() {
throw getRuntime().newTypeError("can't create instance of virtual class");
}
}