geo/tcLandsatMetaData.cpp

   1 /***************************************************************************
   2  *   This file is part of Tecorrec.                                        *
   3  *   Copyright 2008 James Hogan <james@albanarts.com>                      *
   4  *                                                                         *
   5  *   Tecorrec is free software: you can redistribute it and/or modify      *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation, either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   Tecorrec is distributed in the hope that it will be useful,           *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with Tecorrec.  If not, write to the Free Software Foundation,  *
  17  *   Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.   *
  18  ***************************************************************************/
  19
  20 /**
  21  * @file tcLandsatMetaData.cpp
  22  * @brief Landsat metadata file.
  23  */
  24
  25 #include "tcLandsatMetaData.h"
  26
  27 #include <QFile>
  28 #include <QRegExp>
  29
  30 #include <QtDebug>
  31
  32 /*
  33  * Constructors + destructor
  34  */
  35
  36 /// Load metadata from a file.
  37 tcLandsatMetaData::tcLandsatMetaData(QFile& file)
  38 {
  39   static QRegExp regexp("^\\s*(\\w+)\\s*=\\s*(\"(.*)\"|(\\S(.*\\S)?))\\s*$");
  40   static QRegExp end("^\\s*END\\s*$");
  41   static QRegExp blank("^\\s*$");
  42   while (!file.atEnd())
  43   {
  44     QByteArray line = file.readLine();
  45     if (regexp.exactMatch(line))
  46     {
  47       QString name = regexp.cap(1);
  48       if ("GROUP" == name)
  49       {
  50         name = regexp.cap(2);
  51         if (m_groups.contains(name))
  52         {
  53           delete m_groups[name];
  54           qDebug() << "Landsat meta data has conflicting groups:" << line;
  55         }
  56         tcLandsatMetaData* newMeta = new tcLandsatMetaData(file);
  57         m_groups[name] = newMeta;
  58       }
  59       else if ("END_GROUP" == name)
  60       {
  61         return;
  62       }
  63       else
  64       {
  65         QVariant value;
  66         QString valueStr = regexp.cap(3);
  67         if (valueStr.isEmpty())
  68         {
  69           valueStr = regexp.cap(4);
  70           bool ok;
  71           double d = valueStr.toDouble(&ok);
  72           if (ok)
  73           {
  74             value = d;
  75           }
  76           else
  77           {
  78             value = valueStr;
  79           }
  80         }
  81         else
  82         {
  83           value = valueStr;
  84         }
  85         m_values[name] = value;
  86       }
  87     }
  88     else if (end.exactMatch(line))
  89     {
  90       return;
  91     }
  92     else if (blank.exactMatch(line))
  93     {
  94     }
  95     else
  96     {
  97       qDebug() << "Parsing error reading landsat meta data:" << line;
  98     }
  99   }
 100 }
 101
 102 /// Destructor.
 103 tcLandsatMetaData::~tcLandsatMetaData()
 104 {
 105 }
 106
 107 /*
 108  * Accessors
 109  */
 110
 111 /// Get the list of group names.
 112 QStringList tcLandsatMetaData::groupNames() const
 113 {
 114   return m_groups.keys();
 115 }
 116
 117 /// Get the list of value names.
 118 QStringList tcLandsatMetaData::valueNames() const
 119 {
 120   return m_values.keys();
 121 }
 122
 123 /// Access a group.
 124 tcLandsatMetaData& tcLandsatMetaData::operator () (const QString& name) const
 125 {
 126   Q_ASSERT(m_groups.contains(name));
 127   return *m_groups[name];
 128 }
 129
 130 /// Access a value.
 131 QVariant tcLandsatMetaData::operator [] (const QString& name) const
 132 {
 133   if (m_values.contains(name))
 134   {
 135     return m_values[name];
 136   }
 137   else
 138   {
 139     return QVariant();
 140   }
 141 }