src/Model_Artwork.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // LameXP - Audio Encoder Front-End
   3 // Copyright (C) 2004-2013 LoRd_MuldeR <MuldeR2@GMX.de>
   4 //
   5 // This program 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 // This program 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 along
  16 // with this program; if not, write to the Free Software Foundation, Inc.,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19 // http://www.gnu.org/licenses/gpl-2.0.txt
  20 ///////////////////////////////////////////////////////////////////////////////
  21
  22 #include "Model_Artwork.h"
  23
  24 #include "Global.h"
  25
  26 #include <QFile>
  27 #include <QMutex>
  28 #include <QMutexLocker>
  29
  30 ////////////////////////////////////////////////////////////
  31 // Shared data class
  32 ////////////////////////////////////////////////////////////
  33
  34 class ArtworkModel_SharedData
  35 {
  36         friend ArtworkModel;
  37
  38 protected:
  39         ArtworkModel_SharedData(const QString &filePath, const bool isOwner)
  40         :
  41                 m_isOwner(isOwner),
  42                 m_filePath(filePath),
  43                 m_fileHandle(NULL)
  44         {
  45                 m_referenceCounter = 1;
  46
  47                 if(!m_filePath.isEmpty())
  48                 {
  49                         QFile *file = new QFile(m_filePath);
  50                         if(file->open(QIODevice::ReadOnly))
  51                         {
  52                                 m_fileHandle = file;
  53                                 return;
  54                         }
  55                         LAMEXP_DELETE(file);
  56                 }
  57         }
  58
  59         ~ArtworkModel_SharedData(void)
  60         {
  61                 if(m_fileHandle)
  62                 {
  63                         if(m_isOwner)
  64                         {
  65                                 m_fileHandle->remove();
  66                         }
  67                         m_fileHandle->close();
  68                         LAMEXP_DELETE(m_fileHandle);
  69                 }
  70         }
  71
  72         static ArtworkModel_SharedData *attach(ArtworkModel_SharedData *ptr)
  73         {
  74                 if(ptr)
  75                 {
  76                         QMutexLocker lock(&s_mutex);
  77                         ptr->m_referenceCounter = ptr->m_referenceCounter + 1;
  78                         return ptr;
  79                 }
  80                 return NULL;
  81         }
  82
  83         static void detach(ArtworkModel_SharedData **ptr)
  84         {
  85                 if(*ptr)
  86                 {
  87                         QMutexLocker lock(&s_mutex);
  88                         (*ptr)->m_referenceCounter = (*ptr)->m_referenceCounter - 1;
  89                         if((*ptr)->m_referenceCounter < 1)
  90                         {
  91                                 delete (*ptr);
  92                         }
  93                         *ptr = NULL;
  94                 }
  95         }
  96
  97         const QString m_filePath;
  98         const bool m_isOwner;
  99         QFile *m_fileHandle;
 100         unsigned int m_referenceCounter;
 101
 102         static QMutex s_mutex;
 103 };
 104
 105 QMutex ArtworkModel_SharedData::s_mutex;
 106
 107 ////////////////////////////////////////////////////////////
 108 // Constructor & Destructor
 109 ////////////////////////////////////////////////////////////
 110
 111 ArtworkModel::ArtworkModel(void)
 112 :
 113         m_mutex(new QMutex)
 114 {
 115         m_data = NULL;
 116 }
 117
 118 ArtworkModel::ArtworkModel(const QString &fileName, bool isOwner)
 119 :
 120         m_mutex(new QMutex)
 121 {
 122         m_data = new ArtworkModel_SharedData(fileName, isOwner);
 123 }
 124
 125 ArtworkModel::ArtworkModel(const ArtworkModel &model)
 126 :
 127         m_mutex(new QMutex)
 128 {
 129         m_data = ArtworkModel_SharedData::attach(model.m_data);
 130 }
 131
 132 ArtworkModel &ArtworkModel::operator=(const ArtworkModel &model)
 133 {
 134         QMutexLocker lock(m_mutex);
 135         ArtworkModel_SharedData::detach(&m_data);
 136         m_data = ArtworkModel_SharedData::attach(model.m_data);
 137         return (*this);
 138 }
 139
 140 ArtworkModel::~ArtworkModel(void)
 141 {
 142         QMutexLocker lock(m_mutex);
 143         ArtworkModel_SharedData::detach(&m_data);
 144         lock.unlock();
 145         LAMEXP_DELETE(m_mutex);
 146 }
 147
 148 ////////////////////////////////////////////////////////////
 149 // Public Functions
 150 ////////////////////////////////////////////////////////////
 151
 152 const QString &ArtworkModel::filePath(void) const
 153 {
 154         QMutexLocker lock(m_mutex);
 155         return (m_data) ? m_data->m_filePath : m_nullString;
 156 }
 157
 158 bool ArtworkModel::isOwner(void) const
 159 {
 160         QMutexLocker lock(m_mutex);
 161         return (m_data) ? m_data->m_isOwner : false;
 162 }
 163
 164 void ArtworkModel::setFilePath(const QString &newPath, bool isOwner)
 165 {
 166         QMutexLocker lock(m_mutex);
 167         ArtworkModel_SharedData::detach(&m_data);
 168         m_data = new ArtworkModel_SharedData(newPath, isOwner);
 169 }
 170
 171 void ArtworkModel::clear(void)
 172 {
 173         QMutexLocker lock(m_mutex);
 174         ArtworkModel_SharedData::detach(&m_data);
 175 }