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54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_MozQueryInterface
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#define mozilla_dom_MozQueryInterface
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/**
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* This class implements an optimized QueryInterface method for
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* XPConnect-wrapped JS objects.
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*
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* For JavaScript callers, it behaves as an ordinary QueryInterface method,
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* returning its `this` object or throwing depending on the interface it was
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* passed.
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*
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* For native XPConnect callers, we bypass JSAPI entirely, and directly check
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* whether the queried interface is in the interfaces list.
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*/
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/dom/NonRefcountedDOMObject.h"
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#include "nsID.h"
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namespace mozilla {
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class ErrorResult;
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namespace dom {
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class MozQueryInterface final : public NonRefcountedDOMObject {
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public:
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explicit MozQueryInterface(nsTArray<nsIID>&& aInterfaces)
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: mInterfaces(std::move(aInterfaces)) {}
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bool QueriesTo(const nsIID& aIID) const;
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void LegacyCall(JSContext* cx, JS::Handle<JS::Value> thisv,
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JS::Handle<JS::Value> aIID,
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JS::MutableHandle<JS::Value> aResult, ErrorResult& aRv) const;
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nsISupports* GetParentObject() const { return nullptr; }
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bool WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
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JS::MutableHandle<JSObject*> aReflector);
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private:
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nsTArray<nsIID> mInterfaces;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_MozQueryInterface
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