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Java > Open Source Codes > org > jruby > internal > runtime > methods > UndefinedMethod


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
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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) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
15  * Copyright (C) 2004-2005 Thomas E Enebo <enebo@acm.org>
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17  * Alternatively, the contents of this file may be used under the terms of
18  * either of the GNU General Public License Version 2 or later (the "GPL"),
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29 package org.jruby.internal.runtime.methods;
30
31 import org.jruby.RubyModule;
32 import org.jruby.runtime.Block;
33 import org.jruby.runtime.ThreadContext;
34 import org.jruby.runtime.Visibility;
35 import org.jruby.runtime.builtin.IRubyObject;
36
37 /**
38  *
39  * @author jpetersen
40  */
41 public class UndefinedMethod extends DynamicMethod {
42     private static final UndefinedMethod instance = new UndefinedMethod(Visibility.PUBLIC);
43
44     /**
45      * Constructor for UndefinedMethod.
46      * @param visibility
47      */
48     private UndefinedMethod(Visibility visibility) {
49         super(null, visibility);
50     }
51     
52     public void preMethod(ThreadContext context, RubyModule implementationClass, IRubyObject self, String JavaDoc name, IRubyObject[] args, boolean noSuper, Block block) {
53         // do nothing
54 }
55     
56     public void postMethod(ThreadContext context) {
57         // do nothing
58 }
59
60     public IRubyObject internalCall(ThreadContext context, RubyModule klazz, IRubyObject self, String JavaDoc name, IRubyObject[] args, boolean noSuper, Block block) {
61         throw new UnsupportedOperationException JavaDoc();
62     }
63
64     /**
65      * If UndefinedMethod gets invoked, don't do the usual method scoping/framing. It should never be invoked.
66      */
67     public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule klazz, String JavaDoc name, IRubyObject[] args, boolean noSuper) {
68         return internalCall(context, klazz, self, name, args, noSuper, Block.NULL_BLOCK);
69     }
70
71     public boolean isUndefined() {
72         return true;
73     }
74     
75     // Dup is not really a dup, but this is a singleton so it hardly matters.
76 public DynamicMethod dup() {
77         return instance;
78     }
79
80     /**
81      * Returns the instance.
82      * @return UndefinedMethod
83      */
84     public static UndefinedMethod getInstance() {
85         return instance;
86     }
87 }
88
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