jruby/core/src/main/java/org/jruby/PrependedModule.java at master · jruby/jruby · GitHub

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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.

* 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 original module/class which is prepended and sets the originals 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 original

* type. This original 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 origin;

public PrependedModule(Ruby runtime, RubyClass superClass, RubyModule prependedClass) {

super(runtime, superClass, false);

origin = prependedClass;

this.metaClass = origin.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 origin 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 origin.getName(context);

}

@Override

public RubyModule getOrigin() {

return origin;

}

@Override

public RubyModule getDelegate() {

return origin;

}

@Deprecated(since = "10.0.3.0")

@Override

public IRubyObject id() {

return origin.id();

}

/**

* We don't want to reveal ourselves to Ruby code, so origin this

* operation.

@Override

public RubyInteger __id__(ThreadContext context) {

return origin.__id__(context);

}

@Override

public void addMethod(ThreadContext context, String id, DynamicMethod method) {

super.addMethod(context, id, method);

method.setDefinedClass(origin);

}

@Override

protected synchronized Map<String, IRubyObject> getClassVariables() {

return origin.getClassVariables();

}

@Override

protected Map<String, IRubyObject> getClassVariablesForRead() {

return origin.getClassVariablesForRead();

}

// CONSTANT TABLE METHODS - pass to origin

@Override

protected IRubyObject constantTableStore(String name, IRubyObject value) {

// FIXME: legal here? may want UnsupportedOperationException

return origin.constantTableStore(name, value);

}

protected IRubyObject constantTableStore(String name, IRubyObject value, boolean hidden) {

// FIXME: legal here? may want UnsupportedOperationException

return origin.constantTableStore(name, value, hidden);

}

@Override

protected ConstantEntry constantEntryFetch(String name) {

return origin.constantEntryFetch(name);

}

@Override

protected IRubyObject constantTableRemove(String name) {

// this _is_ legal (when removing an undef)

return origin.constantTableRemove(name);

}

@Override

protected IRubyObject getAutoloadConstant(ThreadContext context, String name, boolean forceLoad) {

return origin.getAutoloadConstant(context, name, forceLoad);

}

@Override

protected Map<String, Autoload> getAutoloadMap() {

return origin.getAutoloadMap();

}

@Override

protected Map<String, Autoload> getAutoloadMapForWrite() {

return origin.getAutoloadMapForWrite();

}

/**

* If the origin was a module, also invalidate its hierarchies

@Override

public void invalidateCacheDescendants(ThreadContext context) {

super.invalidateCacheDescendants(context);

if (origin.isModule()) {

origin.invalidateCacheDescendants(context);

}

jruby/core/src/main/java/org/jruby/PrependedModule.java at master · jruby/jruby · GitHub

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jruby/core/src/main/java/org/jruby/PrependedModule.java at master · jruby/jruby · GitHub

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