208 lines
8.1 KiB
C++
208 lines
8.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* David Hyatt <hyatt@netscape.com> (Original Author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsXBLProtoImpl.h"
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#include "nsIContent.h"
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#include "nsIDocument.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsIScriptGlobalObjectOwner.h"
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#include "nsIScriptContext.h"
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#include "nsIXPConnect.h"
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#include "nsIServiceManager.h"
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#include "nsIXBLDocumentInfo.h"
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nsresult
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nsXBLProtoImpl::InstallImplementation(nsXBLPrototypeBinding* aBinding, nsIContent* aBoundElement)
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{
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// This function is called to install a concrete implementation on a bound element using
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// this prototype implementation as a guide. The prototype implementation is compiled lazily,
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// so for the first bound element that needs a concrete implementation, we also build the
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// prototype implementation.
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if (!mMembers)
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return NS_OK; // Nothing to do, so let's not waste time.
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nsIDocument* document = aBoundElement->GetDocument();
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if (!document) return NS_OK;
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nsIScriptGlobalObject *global = document->GetScriptGlobalObject();
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if (!global) return NS_OK;
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nsIScriptContext *context = global->GetContext();
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if (!context) return NS_OK;
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// InitTarget objects gives us back the JS object that represents the bound element and the
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// class object in the bound document that represents the concrete version of this implementation.
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// This function also has the side effect of building up the prototype implementation if it has
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// not been built already.
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void * targetScriptObject = nsnull;
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void * targetClassObject = nsnull;
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nsresult rv = InitTargetObjects(aBinding, context, aBoundElement,
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&targetScriptObject, &targetClassObject);
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NS_ENSURE_SUCCESS(rv, rv); // kick out if we were unable to properly intialize our target objects
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// Walk our member list and install each one in turn.
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for (nsXBLProtoImplMember* curr = mMembers;
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curr;
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curr = curr->GetNext())
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curr->InstallMember(context, aBoundElement, targetScriptObject,
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targetClassObject, mClassName);
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return NS_OK;
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}
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nsresult
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nsXBLProtoImpl::InitTargetObjects(nsXBLPrototypeBinding* aBinding,
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nsIScriptContext* aContext,
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nsIContent* aBoundElement,
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void** aScriptObject,
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void** aTargetClassObject)
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{
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nsresult rv = NS_OK;
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if (!mClassObject) {
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rv = CompilePrototypeMembers(aBinding); // This is the first time we've ever installed this binding on an element.
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// We need to go ahead and compile all methods and properties on a class
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// in our prototype binding.
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if (NS_FAILED(rv))
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return rv;
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if (!mClassObject)
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return NS_OK; // This can be ok, if all we've got are fields (and no methods/properties).
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}
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// Because our prototype implementation has a class, we need to build up a corresponding
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// class for the concrete implementation in the bound document.
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JSContext* jscontext = (JSContext*)aContext->GetNativeContext();
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JSObject* global = ::JS_GetGlobalObject(jscontext);
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nsCOMPtr<nsIXPConnectJSObjectHolder> wrapper;
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nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID(), &rv));
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NS_ENSURE_SUCCESS(rv, rv);
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rv = xpc->WrapNative(jscontext, global, aBoundElement,
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NS_GET_IID(nsISupports), getter_AddRefs(wrapper));
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NS_ENSURE_SUCCESS(rv, rv);
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JSObject * object = nsnull;
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rv = wrapper->GetJSObject(&object);
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NS_ENSURE_SUCCESS(rv, rv);
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// All of the above code was just obtaining the bound element's script object and its immediate
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// concrete base class. We need to alter the object so that our concrete class is interposed
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// between the object and its base class. We become the new base class of the object, and the
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// object's old base class becomes the new class' base class.
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*aScriptObject = object;
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rv = aBinding->InitClass(mClassName, aContext, (void *) object, aTargetClassObject);
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if (NS_FAILED(rv))
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return rv;
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// Root ourselves in the document.
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nsIDocument* doc = aBoundElement->GetDocument();
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if (doc) {
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nsCOMPtr<nsIXPConnectWrappedNative> nativeWrapper(do_QueryInterface(wrapper));
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if (nativeWrapper)
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doc->AddReference(aBoundElement, nativeWrapper);
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}
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return rv;
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}
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nsresult
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nsXBLProtoImpl::CompilePrototypeMembers(nsXBLPrototypeBinding* aBinding)
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{
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// We want to pre-compile our implementation's members against a "prototype context". Then when we actually
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// bind the prototype to a real xbl instance, we'll clone the pre-compiled JS into the real instance's
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// context.
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nsCOMPtr<nsIScriptGlobalObjectOwner> globalOwner(
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do_QueryInterface(aBinding->XBLDocumentInfo()));
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nsCOMPtr<nsIScriptGlobalObject> globalObject;
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globalOwner->GetScriptGlobalObject(getter_AddRefs(globalObject));
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nsIScriptContext *context = globalObject->GetContext();
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void* classObject;
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JSObject* scopeObject = globalObject->GetGlobalJSObject();
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nsresult rv = aBinding->InitClass(mClassName, context, scopeObject, &classObject);
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if (NS_FAILED(rv))
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return rv;
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mClassObject = (JSObject*) classObject;
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if (!mClassObject)
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return NS_ERROR_FAILURE;
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// Now that we have a class object installed, we walk our member list and compile each of our
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// properties and methods in turn.
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for (nsXBLProtoImplMember* curr = mMembers;
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curr;
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curr = curr->GetNext()) {
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nsresult rv = curr->CompileMember(context, mClassName, mClassObject);
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if (NS_FAILED(rv)) {
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DestroyMembers(curr);
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return rv;
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}
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}
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return NS_OK;
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}
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void
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nsXBLProtoImpl::DestroyMembers(nsXBLProtoImplMember* aBrokenMember)
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{
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NS_ASSERTION(mClassObject, "This should never be called when there is no class object");
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PRBool compiled = PR_TRUE;
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for (nsXBLProtoImplMember* curr = mMembers; curr; curr = curr->GetNext()) {
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if (curr == aBrokenMember) {
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compiled = PR_FALSE;
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}
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curr->Destroy(compiled);
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}
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}
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nsresult
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NS_NewXBLProtoImpl(nsXBLPrototypeBinding* aBinding,
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const PRUnichar* aClassName,
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nsXBLProtoImpl** aResult)
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{
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nsXBLProtoImpl* impl = new nsXBLProtoImpl();
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if (!impl)
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return NS_ERROR_OUT_OF_MEMORY;
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if (aClassName)
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impl->mClassName.AssignWithConversion(aClassName);
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else
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aBinding->BindingURI()->GetSpec(impl->mClassName);
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aBinding->SetImplementation(impl);
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*aResult = impl;
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return NS_OK;
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}
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