diff -r cfcbf08528c4 -r 2b40d63a9c3d qtmobility/src/sensors/qsensormanager.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qtmobility/src/sensors/qsensormanager.cpp	Fri Apr 16 15:51:22 2010 +0300
@@ -0,0 +1,292 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qsensormanager.h"
+#include <QDebug>
+#include "qsensorpluginloader_p.h"
+#include "qsensorplugin.h"
+#include <QSettings>
+
+//#define LOG() if (1); else qDebug()
+
+QTM_BEGIN_NAMESPACE
+
+Q_GLOBAL_STATIC_WITH_ARGS(QSensorPluginLoader, pluginLoader, (QSensorPluginInterface_iid, QLatin1String("/sensors")))
+
+typedef QHash<QByteArray,QSensorBackendFactory*> FactoryForIdentifierMap;
+typedef QHash<QByteArray,FactoryForIdentifierMap> BackendIdentifiersForTypeMap;
+
+class QSensorManagerPrivate
+{
+public:
+    QSensorManagerPrivate()
+        : pluginsLoaded(false)
+    {
+    }
+
+    bool pluginsLoaded;
+
+    QList<CreatePluginFunc> staticRegistrations;
+
+    // Holds a mapping from type to available identifiers (and from there to the factory)
+    BackendIdentifiersForTypeMap backendsByType;
+
+    // Holds the first identifier for each type
+    QHash<QByteArray, QByteArray> firstIdentifierForType;
+};
+
+Q_GLOBAL_STATIC(QSensorManagerPrivate, sensorManagerPrivate)
+
+static void loadPlugins()
+{
+    QSensorManagerPrivate *d = sensorManagerPrivate();
+    d->pluginsLoaded = true;
+
+    qDebug() << "initializing static plugins";
+    Q_FOREACH (CreatePluginFunc func, d->staticRegistrations) {
+        QSensorPluginInterface *plugin = func();
+        plugin->registerSensors();
+    }
+
+    qDebug() << "initializing plugins";
+    Q_FOREACH (QSensorPluginInterface *plugin, pluginLoader()->plugins()) {
+        plugin->registerSensors();
+    }
+}
+
+// =====================================================================
+
+/*!
+    \class QSensorManager
+    \ingroup sensors_backend
+
+    \preliminary
+    \brief The QSensorManager class returns the sensors on a device.
+
+    A given device will have a variety of sensors. The sensors are
+    categorized by type.
+*/
+
+/*!
+    Register a sensor for \a type. The \a identifier must be unique.
+
+    The \a factory will be asked to create instances of the backend.
+*/
+void QSensorManager::registerBackend(const QByteArray &type, const QByteArray &identifier, QSensorBackendFactory *factory)
+{
+    QSensorManagerPrivate *d = sensorManagerPrivate();
+    if (!d->backendsByType.contains(type)) {
+        (void)d->backendsByType[type];
+        d->firstIdentifierForType[type] = identifier;
+    }
+    qDebug() << "registering backend for type" << type << "identifier" << identifier;// << "factory" << QString().sprintf("0x%08x", (unsigned int)factory);
+    FactoryForIdentifierMap &factoryByIdentifier = d->backendsByType[type];
+    factoryByIdentifier[identifier] = factory;
+}
+
+/*!
+    \internal
+*/
+void QSensorManager::registerStaticPlugin(CreatePluginFunc func)
+{
+    QSensorManagerPrivate *d = sensorManagerPrivate();
+    d->staticRegistrations.append(func);
+}
+
+/*!
+    Create a backend for \a sensor. Returns null if no suitable backend exists.
+*/
+QSensorBackend *QSensorManager::createBackend(QSensor *sensor)
+{
+    Q_ASSERT(sensor);
+
+    QSensorManagerPrivate *d = sensorManagerPrivate();
+    if (!d->pluginsLoaded)
+        loadPlugins();
+
+    //LOG() << "QSensorManager::createBackend" << "type" << sensor->type() << "identifier" << sensor->identifier();
+
+    if (!d->backendsByType.contains(sensor->type())) {
+        qDebug() << "no backends of type" << sensor->type() << "have been registered.";
+        return 0;
+    }
+
+    const FactoryForIdentifierMap &factoryByIdentifier = d->backendsByType[sensor->type()];
+    QSensorBackendFactory *factory;
+    QSensorBackend *backend;
+
+    if (sensor->identifier().isEmpty()) {
+        QByteArray defaultIdentifier = QSensor::defaultSensorForType(sensor->type());
+        //LOG() << "Trying the default" << defaultIdentifier;
+        // No identifier set, try the default
+        factory = factoryByIdentifier[defaultIdentifier];
+        //LOG() << "factory" << QString().sprintf("0x%08x", (unsigned int)factory);
+        sensor->setIdentifier(defaultIdentifier); // the factory requires this
+        backend = factory->createBackend(sensor);
+        if (backend) return backend; // Got it!
+
+        // The default failed to instantiate so try any other registered sensors for this type
+        Q_FOREACH (const QByteArray &identifier, factoryByIdentifier.keys()) {
+            //LOG() << "Trying" << identifier;
+            if (identifier == defaultIdentifier) continue; // Don't do the default one again
+            factory = factoryByIdentifier[identifier];
+            //LOG() << "factory" << QString().sprintf("0x%08x", (unsigned int)factory);
+            sensor->setIdentifier(identifier); // the factory requires this
+            backend = factory->createBackend(sensor);
+            if (backend) return backend; // Got it!
+        }
+        //LOG() << "FAILED";
+        sensor->setIdentifier(QByteArray()); // clear the identifier
+    } else {
+        if (!factoryByIdentifier.contains(sensor->identifier())) {
+            qDebug() << "no backend with identifier" << sensor->identifier() << "for type" << sensor->type();
+            return 0;
+        }
+
+        // We were given an explicit identifier so don't substitute other backends if it fails to instantiate
+        factory = factoryByIdentifier[sensor->identifier()];
+        //LOG() << "factory" << QString().sprintf("0x%08x", (unsigned int)factory);
+        backend = factory->createBackend(sensor);
+        if (backend) return backend; // Got it!
+    }
+
+    qDebug() << "no suitable backend found for requested identifier" << sensor->identifier() << "and type" << sensor->type();
+    return 0;
+}
+
+// =====================================================================
+
+/*!
+    Returns a list of all sensor types.
+*/
+QList<QByteArray> QSensor::sensorTypes()
+{
+    QSensorManagerPrivate *d = sensorManagerPrivate();
+    if (!d->pluginsLoaded)
+        loadPlugins();
+
+    return d->backendsByType.keys();
+}
+
+/*!
+    Returns a list of ids for each of the sensors for \a type.
+    If there are no sensors of that type available the list will be empty.
+*/
+QList<QByteArray> QSensor::sensorsForType(const QByteArray &type)
+{
+    QSensorManagerPrivate *d = sensorManagerPrivate();
+    if (!d->pluginsLoaded)
+        loadPlugins();
+
+    return d->backendsByType[type].keys();
+}
+
+/*!
+    Returns the default sensor identifier for \a type.
+    This is set in a config file and can be overridden if required.
+    If no default is available the system will return the first registered
+    sensor for \a type.
+*/
+QByteArray QSensor::defaultSensorForType(const QByteArray &type)
+{
+    QSensorManagerPrivate *d = sensorManagerPrivate();
+    if (!d->pluginsLoaded)
+        loadPlugins();
+
+    // no sensors of that type exist
+    if (!d->backendsByType.contains(type))
+        return QByteArray();
+
+    QSettings settings(QLatin1String("Nokia"), QLatin1String("Sensors"));
+    QVariant value = settings.value(QString(QLatin1String("Default/%1")).arg(QString::fromLatin1(type)));
+    if (!value.isNull()) {
+        QByteArray defaultIdentifier = value.toByteArray();
+        if (d->backendsByType[type].contains(defaultIdentifier)) // Don't return a value that we can't use!
+            return defaultIdentifier;
+    }
+
+    // This is our fallback
+    return d->firstIdentifierForType[type];
+}
+
+// =====================================================================
+
+/*!
+    \class QSensorBackendFactory
+    \ingroup sensors_backend
+
+    \preliminary
+    \brief The QSensorBackendFactory class instantiates instances of
+           QSensorBackend.
+
+    This interface must be implemented in order to register a sensor backend.
+
+    \sa {Creating a sensor plugin}
+*/
+
+/*!
+    \fn QSensorBackendFactory::~QSensorBackendFactory()
+    \internal
+*/
+
+/*!
+    \fn QSensorBackendFactory::createBackend(QSensor *sensor)
+
+    Instantiate a backend. If the factory handles multiple identifiers
+    it should check with the \a sensor to see which one is requested.
+
+    If the factory cannot create a backend it should return 0.
+*/
+
+/*!
+    \macro REGISTER_STATIC_PLUGIN(pluginname)
+    \relates QSensorManager
+
+    Registers a static plugin, \a pluginname.
+
+    Note that this macro relies on static initialization so it may not be appropriate
+    for use in a library and may not work on all platforms.
+
+    \sa {Creating a sensor plugin}
+*/
+
+QTM_END_NAMESPACE
+