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) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
15: * Copyright (C) 2004-2006 Thomas E Enebo <enebo@acm.org>
16: * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
17: *
18: * Alternatively, the contents of this file may be used under the terms of
19: * either of the GNU General Public License Version 2 or later (the "GPL"),
20: * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
21: * in which case the provisions of the GPL or the LGPL are applicable instead
22: * of those above. If you wish to allow use of your version of this file only
23: * under the terms of either the GPL or the LGPL, and not to allow others to
24: * use your version of this file under the terms of the CPL, indicate your
25: * decision by deleting the provisions above and replace them with the notice
26: * and other provisions required by the GPL or the LGPL. If you do not delete
27: * the provisions above, a recipient may use your version of this file under
28: * the terms of any one of the CPL, the GPL or the LGPL.
29: ***** END LICENSE BLOCK *****/package org.jruby;
30:
31: import org.jruby.runtime.ClassIndex;
32: import org.jruby.runtime.ObjectAllocator;
33: import org.jruby.runtime.builtin.IRubyObject;
34: import org.jruby.util.collections.SinglyLinkedList;
35:
36: public class MetaClass extends RubyClass {
37:
38: public MetaClass(Ruby runtime, RubyClass super Class,
39: ObjectAllocator allocator, SinglyLinkedList parentCRef) {
40: super (runtime, runtime.getClass("Class"), super Class,
41: allocator, parentCRef, null);
42:
43: this .index = ClassIndex.CLASS;
44: }
45:
46: public boolean isSingleton() {
47: return true;
48: }
49:
50: protected RubyClass subclass() {
51: throw getRuntime().newTypeError(
52: "can't make subclass of virtual class");
53: }
54:
55: /**
56: * If an object uses an anonymous class 'class << obj', then this grabs the original
57: * metaclass and not the one that get injected as a result of 'class << obj'.
58: */
59: public RubyClass getRealClass() {
60: return getSuperClass().getRealClass();
61: }
62:
63: public void methodAdded(RubySymbol symbol) {
64: getAttachedObject().callMethod(
65: getRuntime().getCurrentContext(),
66: "singleton_method_added", symbol);
67: }
68:
69: public IRubyObject getAttachedObject() {
70: // Though it may not be obvious, attachToObject is always called just after instance
71: // creation. Kind of a brittle arrangement here...
72: return getInstanceVariable("__attached__");
73: }
74:
75: public IRubyObject allocateObject() {
76: throw getRuntime().newTypeError(
77: "can't create instance of virtual class");
78: }
79: }
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