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/*
* Copyright (C) 2008, 2009 Nokia Corporation.
*
* Contact: Marius Vollmer <marius.vollmer@nokia.com>
*
* This program 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 program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#ifndef PROPERTYHANDLE_H
#define PROPERTYHANDLE_H
#include <QObject>
#include <QString>
#include <QVariant>
#include <QSet>
#include <QReadWriteLock>
#include <QMutex>
class ContextPropertyInfo;
class ContextProviderInfo;
namespace ContextSubscriber {
class Provider;
class DBusNameListener;
class PropertyHandle : public QObject
{
Q_OBJECT
public:
void subscribe();
void unsubscribe();
QString key() const;
QVariant value() const;
bool isSubscribePending() const;
const ContextPropertyInfo* info() const;
static PropertyHandle* instance(const QString& key);
static const ContextProviderInfo commanderInfo;
void onValueChanged();
void setSubscribeFinished(Provider *provider);
static void ignoreCommander();
static void setTypeCheck(bool typeCheck);
Q_SIGNALS:
void valueChanged();
private Q_SLOTS:
void updateProvider();
private:
PropertyHandle(const QString& key);
QSet<Provider*> pendingSubscriptions; ///< Providers pending subscription
QList<Provider*> myProviders; ///< Providers of this property
ContextPropertyInfo *myInfo; ///< Metadata for this property
unsigned int subscribeCount; ///< Number of subscribed ContextProperty objects subscribed to this property
QMutex subscribeCountLock;
QString myKey; ///< Key of this property
mutable QReadWriteLock valueLock;
QVariant myValue; ///< Current value of this property
static DBusNameListener *commanderListener; ///< Listener for ContextCommander's (dis)appearance
static bool commandingEnabled; ///< Whether the properties can be directed to ContextCommander
static bool typeCheckEnabled; ///< Whether we check the type of the value received from the provider
};
} // end namespace
#endif
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