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/*
* Copyright (C) 2008 Nokia Corporation.
*
* Contact: Marius Vollmer <marius.vollmer@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#ifndef PROPERTYPRIVATE_H
#define PROPERTYPRIVATE_H
#include <QObject>
#include <QString>
#include <QVariant>
#include <QPair>
namespace ContextProvider {
class ServiceBackend;
class Property;
class PropertyPrivate : public QObject
{
Q_OBJECT
public:
explicit PropertyPrivate(ServiceBackend* serviceBackend, const QString &key, QObject *parent = 0);
void setValue(const QVariant& v);
void updateOverheardValue(const QVariantList&, const quint64&);
void setSubscribed();
void setUnsubscribed();
signals:
void valueChanged(const QVariantList& values, const quint64& timestamp);
void firstSubscriberAppeared(const QString& key);
void lastSubscriberDisappeared(const QString& key);
private:
static quint64 currentTimestamp();
void emitValue();
int refCount; ///< Number of Property instance sharing this PropertyPrivate
ServiceBackend* serviceBackend; ///< Pointer to the serviceBackend taking care of D-Bus related things
QString key; ///< Key of this property
QVariant value; ///< Current value of the property, set by this provider. QVariant() if null.
quint64 timestamp; ///< Time when the value was set
bool subscribed; ///< True if this Property is subscribed to by the clients.
QVariant emittedValue; ///< Last value emitted by this provider.
quint64 emittedTimestamp; ///< Time when the emittedValue was emitted.
bool overheard; ///< True if provider overheard a value over D-Bus (must be different and more recent than emitted)
/// Map of PropertyPrivate instances
static QHash<QPair<ServiceBackend*, QString>, PropertyPrivate*> propertyPrivateMap;
friend class Property;
friend class PropertyAdaptor;
};
} // end namespace
#endif
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