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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtSensors module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qsensorbackend_p.h"
+#include "qsensor_p.h"
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+QTM_BEGIN_NAMESPACE
+
+/*!
+    \class QSensorBackend
+    \ingroup sensors_backend
+    \inmodule QtSensors
+    \since 1.0
+
+    \brief The QSensorBackend class is a sensor implementation.
+
+    Sensors on a device will be represented by sub-classes of
+    QSensorBackend.
+*/
+
+/*!
+    \internal
+*/
+QSensorBackend::QSensorBackend(QSensor *sensor)
+    : m_sensor(sensor)
+{
+}
+
+/*!
+    \internal
+*/
+QSensorBackend::~QSensorBackend()
+{
+}
+
+/*!
+    Notify the QSensor class that a new reading is available.
+*/
+void QSensorBackend::newReadingAvailable()
+{
+    QSensorPrivate *d = m_sensor->d_func();
+
+    // Copy the values from the device reading to the filter reading
+    d->filter_reading->copyValuesFrom(d->device_reading);
+
+    for (QFilterList::const_iterator it = d->filters.constBegin(); it != d->filters.constEnd(); ++it) {
+        QSensorFilter *filter = (*it);
+        if (!filter->filter(d->filter_reading))
+            return;
+    }
+
+    // Copy the values from the filter reading to the cached reading
+    d->cache_reading->copyValuesFrom(d->filter_reading);
+
+    Q_EMIT m_sensor->readingChanged();
+}
+
+/*!
+    \fn QSensorBackend::start()
+
+    Start reporting values.
+*/
+
+/*!
+    \fn QSensorBackend::stop()
+
+    Stop reporting values.
+*/
+
+/*!
+    If the backend has lost its reference to the reading
+    it can call this method to get the address.
+
+    Note that you will need to down-cast to the appropriate
+    type.
+
+    \sa setReading()
+*/
+QSensorReading *QSensorBackend::reading() const
+{
+    QSensorPrivate *d = m_sensor->d_func();
+    return d->device_reading;
+}
+
+/*!
+    \fn QSensorBackend::sensor() const
+
+    Returns the sensor front end associated with this backend.
+*/
+
+/*!
+    \fn QSensorBackend::setReading(T *reading)
+
+    This function is called to initialize the \a reading
+    classes used for a sensor.
+
+    If your backend has already allocated a reading you
+    should pass the address of this to the function.
+    Otherwise you should pass 0 and the function will
+    return the address of the reading your backend
+    should use when it wants to notify the sensor API
+    of new readings.
+
+    Note that this is a template function so it should
+    be called with the appropriate type.
+
+    \code
+    class MyBackend : public QSensorBackend
+    {
+        QAccelerometerReading m_reading;
+    public:
+        MyBackend(QSensor *sensor)
+            : QSensorBackend(sensor)
+        {
+            setReading<QAccelerometerReading>(&m_reading);
+        }
+
+        ...
+    \endcode
+
+    Note that this function must be called or you will
+    not be able to send readings to the front end.
+
+    If you do not wish to store the address of the reading
+    you may use the reading() method to get it again later.
+
+    \code
+    class MyBackend : public QSensorBackend
+    {
+    public:
+        MyBackend(QSensor *sensor)
+            : QSensorBackend(sensor)
+        {
+            setReading<QAccelerometerReading>(0);
+        }
+
+        void poll()
+        {
+            quint64 timestamp;
+            qreal x, y, z;
+            ...
+            QAccelerometerReading *reading = static_cast<QAccelerometerReading*>(reading());
+            reading->setTimestamp(timestamp);
+            reading->setX(x);
+            reading->setY(y);
+            reading->setZ(z);
+        }
+
+        ...
+    \endcode
+
+    \sa reading()
+*/
+
+/*!
+    \internal
+*/
+void QSensorBackend::setReadings(QSensorReading *device, QSensorReading *filter, QSensorReading *cache)
+{
+    QSensorPrivate *d = m_sensor->d_func();
+    d->device_reading = device;
+    d->filter_reading = filter;
+    d->cache_reading = cache;
+}
+
+/*!
+    Add a data rate (consisting of \a min and \a max values) for the sensor.
+
+    Note that this function should be called from the constructor so that the information
+    is available immediately.
+
+    \sa QSensor::availableDataRates
+*/
+void QSensorBackend::addDataRate(qreal min, qreal max)
+{
+    QSensorPrivate *d = m_sensor->d_func();
+    d->availableDataRates << qrange(min, max);
+}
+
+/*!
+    Set the data rates for the sensor based on \a otherSensor.
+
+    This is designed for sensors that are based on other sensors.
+
+    \code
+    setDataRates(otherSensor);
+    \endcode
+
+    Note that this function should be called from the constructor so that the information
+    is available immediately.
+
+    \sa QSensor::availableDataRates, addDataRate()
+*/
+void QSensorBackend::setDataRates(const QSensor *otherSensor)
+{
+    if (!otherSensor) {
+        qWarning() << "ERROR: Cannot call QSensorBackend::setDataRates with 0";
+        return;
+    }
+    if (otherSensor->identifier().isEmpty()) {
+        qWarning() << "ERROR: Cannot call QSensorBackend::setDataRates with an invalid sensor";
+        return;
+    }
+    QSensorPrivate *d = m_sensor->d_func();
+    d->availableDataRates = otherSensor->availableDataRates();
+    d->dataRate = otherSensor->dataRate();
+}
+
+/*!
+    Add an output range (consisting of \a min, \a max values and \a accuracy) for the sensor.
+
+    Note that this function should be called from the constructor so that the information
+    is available immediately.
+
+    \sa QSensor::outputRange, QSensor::outputRanges
+*/
+void QSensorBackend::addOutputRange(qreal min, qreal max, qreal accuracy)
+{
+    QSensorPrivate *d = m_sensor->d_func();
+
+    qoutputrange details = {min, max, accuracy};
+
+    d->outputRanges << details;
+}
+
+/*!
+    Set the \a description for the sensor.
+
+    Note that this function should be called from the constructor so that the information
+    is available immediately.
+*/
+void QSensorBackend::setDescription(const QString &description)
+{
+    QSensorPrivate *d = m_sensor->d_func();
+    d->description = description;
+}
+
+/*!
+    Inform the front end that the sensor has stopped.
+    This can be due to start() failing or for some
+    unexpected reason (eg. hardware failure).
+
+    Note that the front end must call QSensor::isActive() to see if
+    the sensor has stopped. If the sensor has stopped due to an error
+    the sensorError() function should be called to notify the class
+    of the error condition.
+*/
+void QSensorBackend::sensorStopped()
+{
+    QSensorPrivate *d = m_sensor->d_func();
+    d->active = false;
+}
+
+/*!
+    Inform the front end that the sensor is busy.
+    This implicitly calls sensorStopped() and
+    is typically called from start().
+
+    Note that the front end must call QSensor::isBusy() to see if
+    the sensor is busy. If the sensor has stopped due to an error
+    the sensorError() function should be called to notify the class
+    of the error condition.
+*/
+void QSensorBackend::sensorBusy()
+{
+    QSensorPrivate *d = m_sensor->d_func();
+    d->active = false;
+    d->busy = true;
+}
+
+/*!
+    Inform the front end that a sensor error occurred.
+    Note that this only reports an \a error code. It does
+    not stop the sensor.
+
+    \sa sensorStopped()
+*/
+void QSensorBackend::sensorError(int error)
+{
+    QSensorPrivate *d = m_sensor->d_func();
+    d->error = error;
+    Q_EMIT m_sensor->sensorError(error);
+}
+
+#include "moc_qsensorbackend_p.cpp"
+QTM_END_NAMESPACE
+QT_END_NAMESPACE
+