/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_MozQueryInterface

#define mozilla_dom_MozQueryInterface

/**

 * This class implements an optimized QueryInterface method for

 * XPConnect-wrapped JS objects.

 *

 * For JavaScript callers, it behaves as an ordinary QueryInterface method,

 * returning its `this` object or throwing depending on the interface it was

 * passed.

 *

 * For native XPConnect callers, we bypass JSAPI entirely, and directly check

 * whether the queried interface is in the interfaces list.

 */

#include "mozilla/dom/BindingDeclarations.h"

#include "mozilla/dom/NonRefcountedDOMObject.h"

#include "mozilla/ErrorResult.h"

#include "nsID.h"

namespace mozilla {

namespace dom {

class MozQueryInterface final : public NonRefcountedDOMObject

{

public:

  explicit MozQueryInterface(nsTArray<nsIID>&& aInterfaces)

    : mInterfaces(std::move(aInterfaces))

  {}

  bool QueriesTo(const nsIID& aIID) const;

  void LegacyCall(JSContext* cx, JS::Handle<JS::Value> thisv, nsIJSID* aIID, JS::MutableHandle<JS::Value> aResult, ErrorResult& aRv) const;

  nsISupports* GetParentObject() const { return nullptr; }

  bool WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto, JS::MutableHandle<JSObject*> aReflector);

private:

  nsTArray<nsIID> mInterfaces;

};

} // namespace dom

} // namespace mozilla

#endif // mozilla_dom_MozQueryInterface