Qt 4.8: timequery.cpp Example File (xmlpatterns/trafficinfo/timequery.cpp)

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# timequery.cpp Example File

xmlpatterns/trafficinfo/timequery.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     #include "timequery.h"

     #include <QtCore/QStringList>
     #include <QtXmlPatterns/QXmlQuery>

     TimeInformation::TimeInformation(const QString &time, const QString &direction)
         : m_time(time), m_direction(direction)
     {
     }

     QString TimeInformation::time() const
     {
         return m_time;
     }

     QString TimeInformation::direction() const
     {
         return m_direction;
     }

     TimeInformation::List TimeQuery::query(const QString &stationId, const QStringList &lineNumbers, const QDateTime &dateTime)
     {
         const TimeInformation::List information = queryInternal(stationId, dateTime);

         TimeInformation::List filteredInformation;

         if (!lineNumbers.isEmpty()) {
             for (int i = 0; i < information.count(); ++i) {
                 const TimeInformation info = information.at(i);
                 for (int j = 0; j < lineNumbers.count(); ++j) {
                     if (info.direction().startsWith(QString("%1 ").arg(lineNumbers.at(j))))
                         filteredInformation.append(info);
                 }
             }
         } else {
             filteredInformation = information;
         }

         return filteredInformation;
     }

     TimeInformation::List TimeQuery::queryInternal(const QString &stationId, const QDateTime &dateTime)
     {
         const QString timesQueryUrl = QString("doc('http://wap.trafikanten.no/F.asp?f=%1&amp;t=%2&amp;m=%3&amp;d=%4&amp;start=1')/wml/card/p/small/a[fn:starts-with(@href, 'Rute')]/string()")
                                              .arg(stationId)
                                              .arg(dateTime.time().hour())
                                              .arg(dateTime.time().minute())
                                              .arg(dateTime.toString("dd.MM.yyyy"));
         const QString directionsQueryUrl = QString("doc('http://wap.trafikanten.no/F.asp?f=%1&amp;t=%2&amp;m=%3&amp;d=%4&amp;start=1')/wml/card/p/small/text()[matches(., '[0-9].*')]/string()")
                                                   .arg(stationId)
                                                   .arg(dateTime.time().hour())
                                                   .arg(dateTime.time().minute())
                                                   .arg(dateTime.toString("dd.MM.yyyy"));

         QStringList times;
         QStringList directions;

         QXmlQuery query;
         query.setQuery(timesQueryUrl);
         query.evaluateTo(&times);

         query.setQuery(directionsQueryUrl);
         query.evaluateTo(&directions);

         if (times.count() != directions.count()) // something went wrong...
             return TimeInformation::List();

         TimeInformation::List information;
         for (int i = 0; i < times.count(); ++i)
             information.append(TimeInformation(times.at(i).simplified(), directions.at(i).simplified()));

         return information;
     }