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     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

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

     8 **

     9 ** $QT_BEGIN_LICENSE:BSD$

    10 ** You may use this file under the terms of the BSD license as follows:

    11 **

    12 ** "Redistribution and use in source and binary forms, with or without

    13 ** modification, are permitted provided that the following conditions are

    14 ** met:

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    17 **   * Redistributions in binary form must reproduce the above copyright

    18 **     notice, this list of conditions and the following disclaimer in

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    20 **     distribution.

    21 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor

    22 **     the names of its contributors may be used to endorse or promote

    23 **     products derived from this software without specific prior written

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    26 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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    37 ** $QT_END_LICENSE$

    38 **

    39 ****************************************************************************/

    40 #include <QtCore>

    41 

    42 #include "logfilepositionsource.h"

    43 

    44 LogFilePositionSource::LogFilePositionSource(QObject *parent)

    45     : QGeoPositionInfoSource(parent),

    46       logFile(new QFile(this)),

    47       timer(new QTimer(this))

    48 {

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

    50 

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

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

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

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

    55 }

    56 

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

    58 {

    59     return lastPosition;

    60 }

    61 

    62 LogFilePositionSource::PositioningMethods LogFilePositionSource::supportedPositioningMethods() const

    63 {

    64     return AllPositioningMethods;

    65 }

    66 

    67 int LogFilePositionSource::minimumUpdateInterval() const

    68 {

    69     return 500;

    70 }

    71 

    72 void LogFilePositionSource::startUpdates()

    73 {

    74     int interval = updateInterval();

    75     if (interval < minimumUpdateInterval())

    76         interval = minimumUpdateInterval();

    77 

    78     timer->start(interval);

    79 }

    80 

    81 void LogFilePositionSource::stopUpdates()

    82 {

    83     timer->stop();

    84 }

    85 

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

    87 {

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

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

    90     if (logFile->canReadLine())

    91         readNextPosition();

    92     else

    93         emit updateTimeout();

    94 }

    95 

    96 void LogFilePositionSource::readNextPosition()

    97 {

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

    99     if (!line.isEmpty()) {

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

   101         double latitude;

   102         double longitude;

   103         bool hasLatitude = false;

   104         bool hasLongitude = false;

   105         QDateTime timestamp = QDateTime::fromString(QString(data.value(0)), Qt::ISODate);

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

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

   108 

   109         if (hasLatitude && hasLongitude && timestamp.isValid()) {

   110             QGeoCoordinate coordinate(latitude, longitude);

   111             QGeoPositionInfo info(coordinate, timestamp);

   112             if (info.isValid()) {

   113                 lastPosition = info;

   114                 emit positionUpdated(info);

   115             }

   116         }

   117     }

   118 }