timequery.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** 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 Nokia Corporation 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.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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;
 }