gecko-dev/hal/WindowIdentifier.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et ft=cpp : */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* 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.
*
* The Original Code is Mozilla Code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Justin Lebar <justin.lebar@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 MPL, 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 MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_hal_WindowIdentifier_h
#define mozilla_hal_WindowIdentifier_h
#include "mozilla/Types.h"
#include "nsTArray.h"
#include "nsCOMPtr.h"
#include "nsIDOMWindow.h"
namespace mozilla {
namespace hal {
/**
* This class serves two purposes.
*
* First, this class wraps a pointer to a window.
*
* Second, WindowIdentifier lets us uniquely identify a window across
* processes. A window exposes an ID which is unique only within its
* process. Thus to identify a window, we need to know the ID of the
* process which contains it. But the scope of a process's ID is its
* parent; that is, two processes with different parents might have
* the same ID.
*
* So to identify a window, we need its ID plus the IDs of all the
* processes in the path from the window's process to the root
* process. We throw in the IDs of the intermediate windows (a
* content window is contained in a window at each level of the
* process tree) for good measures.
*
* You can access this list of IDs by calling AsArray().
*/
class WindowIdentifier
{
public:
/**
* Create an empty WindowIdentifier. Calls to any of this object's
* public methods will assert -- an empty WindowIdentifier may be
* used only as a placeholder to code which promises not to touch
* the object.
*/
WindowIdentifier();
/**
* Copy constructor.
*/
WindowIdentifier(const WindowIdentifier& other);
/**
* Wrap the given window in a WindowIdentifier. These two
* constructors automatically grab the window's ID and append it to
* the array of IDs.
*
* Note that these constructors allow an implicit conversion to a
* WindowIdentifier.
*/
explicit WindowIdentifier(nsIDOMWindow* window);
/**
* Create a new WindowIdentifier with the given id array and window.
* This automatically grabs the window's ID and appends it to the
* array.
*/
WindowIdentifier(const nsTArray<uint64>& id, nsIDOMWindow* window);
/**
* Get the list of window and process IDs we contain.
*/
typedef InfallibleTArray<uint64> IDArrayType;
const IDArrayType& AsArray() const;
/**
* Append the ID of the ContentChild singleton to our array of
* window/process IDs.
*/
void AppendProcessID();
/**
* Does this WindowIdentifier identify both a window and the process
* containing that window? If so, we say it has traveled through
* IPC.
*/
bool HasTraveledThroughIPC() const;
/**
* Get the window this object wraps.
*/
nsIDOMWindow* GetWindow() const;
private:
/**
* Get the ID of the window object we wrap.
*/
uint64 GetWindowID() const;
AutoInfallibleTArray<uint64, 3> mID;
nsCOMPtr<nsIDOMWindow> mWindow;
bool mIsEmpty;
};
} // namespace hal
} // namespace mozilla
#endif // mozilla_hal_WindowIdentifier_h