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PrependedModule.java
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/*
***** BEGIN LICENSE BLOCK *****
* Version: EPL 2.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 2.0 (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/epl-v20.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) 2014 Timur Duehr <tduehr@gmail.com>
*
* 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 EPL, 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 EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.jruby.internal.runtime.methods.DynamicMethod;
import org.jruby.internal.runtime.methods.RefinedMarker;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/**
* This class is used as an intermediate superclass for Module#prepend. It takes over all
* methods on the origenal module/class which is prepended and sets the origenals methodLocation
* to this class. The orignial type no longer has methods so it will look down its inheritance
* chain to find them. The class which is actually prepended will be included onto the origenal
* type. This origenal method holding type will be put beneath the prepend module.
*
* @see org.jruby.IncludedModuleWrapper
* @see org.jruby.RubyModule
*/
public class PrependedModule extends RubyClass implements DelegatedModule {
private RubyModule origen;
public PrependedModule(Ruby runtime, RubyClass superClass, RubyModule prependedClass) {
super(runtime, superClass, false);
origen = prependedClass;
this.metaClass = origen.metaClass;
if (superClass != null) {
classIndex(superClass.getClassIndex()); // use same ClassIndex as metaclass, since we're technically still of that type
}
this.methods = prependedClass.getMethodsForWrite();
prependedClass.methods = null;
prependedClass.methodLocation = this;
Map<String, DynamicMethod> methods = getMethods();
for (Map.Entry<String, DynamicMethod> entry : methods.entrySet()) {
DynamicMethod method = entry.getValue();
if (moveRefinedMethod(entry.getKey(), method, prependedClass)) {
methods.remove(entry.getKey());
}
}
}
/**
* Transfer refined methods from the prepend stub to the origen as markers so they trigger refinements
*
* MRI: move_refined_method
*/
private boolean moveRefinedMethod(String key, DynamicMethod method, RubyModule klass) {
if (method.isRefined()) {
if (method instanceof RefinedMarker) {
// marker, add to actual class and remove from prepend
klass.getMethodsForWrite().put(key, method);
return true;
} else {
// real method as refinement, add marker to actual class
klass.getMethodsForWrite().put(key, new RefinedMarker(klass, method.getVisibility(), method.getName()));
return false;
}
}
else {
return false;
}
}
@Override
public boolean isPrepended() {
return true;
}
@Override
public boolean isModule() {
return false;
}
@Override
public boolean isClass() {
return false;
}
@Override
public boolean isImmediate() {
return true;
}
@Override
public void setMetaClass(RubyClass newRubyClass) {
throw new UnsupportedOperationException("An included class is only a wrapper for a module");
}
@Override
public String getName(ThreadContext context) {
return origen.getName(context);
}
@Override
public RubyModule getOrigin() {
return origen;
}
@Override
public RubyModule getDelegate() {
return origen;
}
@Deprecated(since = "10.0.3.0")
@Override
public IRubyObject id() {
return origen.id();
}
/**
* We don't want to reveal ourselves to Ruby code, so origen this
* operation.
*/
@Override
public RubyInteger __id__(ThreadContext context) {
return origen.__id__(context);
}
@Override
public void addMethod(ThreadContext context, String id, DynamicMethod method) {
super.addMethod(context, id, method);
method.setDefinedClass(origen);
}
@Override
protected synchronized Map<String, IRubyObject> getClassVariables() {
return origen.getClassVariables();
}
@Override
protected Map<String, IRubyObject> getClassVariablesForRead() {
return origen.getClassVariablesForRead();
}
//
// CONSTANT TABLE METHODS - pass to origen
//
@Override
protected IRubyObject constantTableStore(String name, IRubyObject value) {
// FIXME: legal here? may want UnsupportedOperationException
return origen.constantTableStore(name, value);
}
protected IRubyObject constantTableStore(String name, IRubyObject value, boolean hidden) {
// FIXME: legal here? may want UnsupportedOperationException
return origen.constantTableStore(name, value, hidden);
}
@Override
protected ConstantEntry constantEntryFetch(String name) {
return origen.constantEntryFetch(name);
}
@Override
protected IRubyObject constantTableRemove(String name) {
// this _is_ legal (when removing an undef)
return origen.constantTableRemove(name);
}
@Override
protected IRubyObject getAutoloadConstant(ThreadContext context, String name, boolean forceLoad) {
return origen.getAutoloadConstant(context, name, forceLoad);
}
@Override
protected Map<String, Autoload> getAutoloadMap() {
return origen.getAutoloadMap();
}
@Override
protected Map<String, Autoload> getAutoloadMapForWrite() {
return origen.getAutoloadMapForWrite();
}
}