source: trunk/src/dbus/qdbuscontext.cpp@ 592

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtDBus module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qdbusmessage.h"
#include "qdbusconnection.h"
#include "qdbusabstractadaptor.h"

#include "qdbuscontext.h"
#include "qdbuscontext_p.h"

QT_BEGIN_NAMESPACE

QDBusContextPrivate *QDBusContextPrivate::set(QObject *obj, QDBusContextPrivate *newContext)
{
    // determine if this is an adaptor or not
    if (qobject_cast<QDBusAbstractAdaptor *>(obj))
        obj = obj->parent();

    Q_ASSERT(obj);

    void *ptr = obj->qt_metacast("QDBusContext");
    QDBusContext *q_ptr = reinterpret_cast<QDBusContext *>(ptr);
    if (q_ptr) {
        QDBusContextPrivate *old = q_ptr->d_ptr;
        q_ptr->d_ptr = newContext;
        return old;
    }

    return 0;
}

/*!
    \since 4.3
    \class QDBusContext
    \inmodule QtDBus

    \brief The QDBusContext class allows slots to determine the D-Bus context of the calls.

    When a slot is called in an object due to a signal delivery or due
    to a remote method call, it is sometimes necessary to know the
    context in which that happened. In particular, if the slot
    determines that it wants to send the reply at a later opportunity
    or if it wants to reply with an error, the context is needed.

    The QDBusContext class is an alternative to accessing the context
    that doesn't involve modifying the code generated by the \l
    {QtDBus XML Compiler (qdbusxml2cpp)}.

    QDBusContext is used by subclassing it from the objects being
    exported using QDBusConnection::registerObject(). The following
    example illustrates the usage:

    \snippet doc/src/snippets/code/src_qdbus_qdbuscontext.cpp 0

    The example illustrates the two typical uses, that of sending
    error replies and that of delayed replies.

    Note: do not subclass QDBusContext and QDBusAbstractAdaptor at the
    same time. QDBusContext should appear in the real object, not the
    adaptor. If it's necessary from the adaptor code to determine the
    context, use a public inheritance and access the functions via
    QObject::parent().
*/

/*!
  Constructs an empty QDBusContext.
 */
QDBusContext::QDBusContext()
    : d_ptr(0)
{