org.jruby.MetaClass Maven / Gradle / Ivy
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* Version: CPL 1.0/GPL 2.0/LGPL 2.1
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* 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
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* 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.
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* Copyright (C) 2002-2004 Jan Arne Petersen
* Copyright (C) 2004-2006 Thomas E Enebo
* Copyright (C) 2004 Stefan Matthias Aust
*
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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package org.jruby;
import java.lang.ref.SoftReference;
import org.jruby.runtime.builtin.IRubyObject;
public final class MetaClass extends RubyClass {
private static final SoftReference NULL_SOFT_REF = new SoftReference(null);
private SoftReference attached = NULL_SOFT_REF;
/** rb_class_boot (for MetaClasses) (in makeMetaClass(RubyClass))
*
*/
public MetaClass(Ruby runtime, RubyClass superClass, IRubyObject attached) {
super(runtime, superClass, false);
this.attached = new SoftReference(attached);
this.index = superClass.index; // use same ClassIndex as metaclass, since we're technically still of that type
}
@Override
public boolean isSingleton() {
return true;
}
/**
* 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 superClass.getRealClass();
}
public final IRubyObject allocate(){
throw runtime.newTypeError("can't create instance of virtual class");
}
public IRubyObject getAttached() {
return attached.get();
}
public void setAttached(IRubyObject attached) {
this.attached = new SoftReference(attached);
}
}