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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the Qt Mobility Components.

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    13 ** contained in the Technology Preview License Agreement accompanying

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 #include <QtCore>

    42 

    43 #include "logfilepositionsource.h"

    44 

    45 LogFilePositionSource::LogFilePositionSource(QObject *parent)

    46     : QGeoPositionInfoSource(parent),

    47       logFile(new QFile(this)),

    48       timer(new QTimer(this))

    49 {

    50     connect(timer, SIGNAL(timeout()), this, SLOT(readNextPosition()));

    51 

    52     logFile->setFileName(QCoreApplication::applicationDirPath()

    53             + QDir::separator() + "simplelog.txt");

    54     if (!logFile->open(QIODevice::ReadOnly))

    55         qWarning() << "Error: cannot open source file" << logFile->fileName();

    56 }

    57 

    58 QGeoPositionInfo LogFilePositionSource::lastKnownPosition(bool /*fromSatellitePositioningMethodsOnly*/) const

    59 {

    60     return lastPosition;

    61 }

    62 

    63 LogFilePositionSource::PositioningMethods LogFilePositionSource::supportedPositioningMethods() const

    64 {

    65     return AllPositioningMethods;

    66 }

    67 

    68 int LogFilePositionSource::minimumUpdateInterval() const

    69 {

    70     return 500;

    71 }

    72 

    73 void LogFilePositionSource::startUpdates()

    74 {

    75     int interval = updateInterval();

    76     if (interval < minimumUpdateInterval())

    77         interval = minimumUpdateInterval();

    78 

    79     timer->start(interval);

    80 }

    81 

    82 void LogFilePositionSource::stopUpdates()

    83 {

    84     timer->stop();

    85 }

    86 

    87 void LogFilePositionSource::requestUpdate(int /*timeout*/)

    88 {

    89     // For simplicity, ignore timeout - assume that if data is not available

    90     // now, no data will be added to the file later

    91     if (logFile->canReadLine())

    92         readNextPosition();

    93     else

    94         emit updateTimeout();

    95 }

    96 

    97 void LogFilePositionSource::readNextPosition()

    98 {

    99     QByteArray line = logFile->readLine().trimmed();

   100     if (!line.isEmpty()) {

   101         QList<QByteArray> data = line.split(' ');

   102         double latitude;

   103         double longitude;

   104         bool hasLatitude = false;

   105         bool hasLongitude = false;

   106         QDateTime dateTime = QDateTime::fromString(QString(data.value(0)), Qt::ISODate);

   107         latitude = data.value(1).toDouble(&hasLatitude);

   108         longitude = data.value(2).toDouble(&hasLongitude);

   109 

   110         if (hasLatitude && hasLongitude && dateTime.isValid()) {

   111             QGeoCoordinate coordinate(latitude, longitude);

   112             QGeoPositionInfo info(coordinate, dateTime);

   113             if (info.isValid()) {

   114                 lastPosition = info;

   115                 emit positionUpdated(info);

   116             }

   117         }

   118     }

   119 }