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, but always including the *additional*
   9 // restrictions defined in the "License.txt" file.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this program; if not, write to the Free Software Foundation, Inc.,
  18 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 //
  20 // http://www.gnu.org/licenses/gpl-2.0.txt
  21 ///////////////////////////////////////////////////////////////////////////////
  22
  23 #include "Model_Artwork.h"
  24
  25 #include "Global.h"
  26
  27 #include <QFile>
  28 #include <QMutex>
  29 #include <QMutexLocker>
  30
  31 ////////////////////////////////////////////////////////////
  32 // Shared data class
  33 ////////////////////////////////////////////////////////////
  34
  35 class ArtworkModel_SharedData
  36 {
  37         friend ArtworkModel;
  38
  39 protected:
  40         ArtworkModel_SharedData(const QString &filePath, const bool isOwner)
  41         :
  42                 m_isOwner(isOwner),
  43                 m_filePath(filePath),
  44                 m_fileHandle(NULL)
  45         {
  46                 m_referenceCounter = 1;
  47
  48                 if(!m_filePath.isEmpty())
  49                 {
  50                         QFile *file = new QFile(m_filePath);
  51                         if(file->open(QIODevice::ReadOnly))
  52                         {
  53                                 m_fileHandle = file;
  54                         }
  55                         else
  56                         {
  57                                 qWarning("[ArtworkModel] Failed to open artwork file!");
  58                                 LAMEXP_DELETE(file);
  59                         }
  60                 }
  61         }
  62
  63         ~ArtworkModel_SharedData(void)
  64         {
  65                 if(m_fileHandle)
  66                 {
  67                         if(m_isOwner)
  68                         {
  69                                 m_fileHandle->remove();
  70                         }
  71                         m_fileHandle->close();
  72                         LAMEXP_DELETE(m_fileHandle);
  73                 }
  74         }
  75
  76         static ArtworkModel_SharedData *attach(ArtworkModel_SharedData *ptr)
  77         {
  78                 if(ptr)
  79                 {
  80                         QMutexLocker lock(&s_mutex);
  81                         ptr->m_referenceCounter = ptr->m_referenceCounter + 1;
  82                         return ptr;
  83                 }
  84                 return NULL;
  85         }
  86
  87         static void detach(ArtworkModel_SharedData **ptr)
  88         {
  89                 if(*ptr)
  90                 {
  91                         QMutexLocker lock(&s_mutex);
  92                         if((*ptr)->m_referenceCounter > 0)
  93                         {
  94                                 (*ptr)->m_referenceCounter = (*ptr)->m_referenceCounter - 1;
  95                                 if((*ptr)->m_referenceCounter < 1)
  96                                 {
  97                                         delete (*ptr);
  98                                 }
  99                         }
 100                         else
 101                         {
 102                                 qWarning("[ArtworkModel::detach] Ref counter already zero!");
 103                         }
 104                         *ptr = NULL;
 105                 }
 106         }
 107
 108         const QString m_filePath;
 109         const bool m_isOwner;
 110         QFile *m_fileHandle;
 111         unsigned int m_referenceCounter;
 112
 113         static QMutex s_mutex;
 114 };
 115
 116 QMutex ArtworkModel_SharedData::s_mutex;
 117
 118 ////////////////////////////////////////////////////////////
 119 // Constructor & Destructor
 120 ////////////////////////////////////////////////////////////
 121
 122 ArtworkModel::ArtworkModel(void)
 123 :
 124         m_mutex(new QMutex)
 125 {
 126         m_data = NULL;
 127 }
 128
 129 ArtworkModel::ArtworkModel(const QString &fileName, bool isOwner)
 130 :
 131         m_mutex(new QMutex)
 132 {
 133         m_data = new ArtworkModel_SharedData(fileName, isOwner);
 134 }
 135
 136 ArtworkModel::ArtworkModel(const ArtworkModel &model)
 137 :
 138         m_mutex(new QMutex)
 139 {
 140         m_data = ArtworkModel_SharedData::attach(model.m_data);
 141 }
 142
 143 ArtworkModel &ArtworkModel::operator=(const ArtworkModel &model)
 144 {
 145         QMutexLocker lock(m_mutex);
 146         if(m_data != model.m_data)
 147         {
 148                 ArtworkModel_SharedData::detach(&m_data);
 149                 m_data = ArtworkModel_SharedData::attach(model.m_data);
 150         }
 151         return (*this);
 152 }
 153
 154 ArtworkModel::~ArtworkModel(void)
 155 {
 156         QMutexLocker lock(m_mutex);
 157         ArtworkModel_SharedData::detach(&m_data);
 158         lock.unlock();
 159         LAMEXP_DELETE(m_mutex);
 160 }
 161
 162 ////////////////////////////////////////////////////////////
 163 // Public Functions
 164 ////////////////////////////////////////////////////////////
 165
 166 const QString &ArtworkModel::filePath(void) const
 167 {
 168         QMutexLocker lock(m_mutex);
 169         return (m_data) ? m_data->m_filePath : m_nullString;
 170 }
 171
 172 bool ArtworkModel::isOwner(void) const
 173 {
 174         QMutexLocker lock(m_mutex);
 175         return (m_data) ? m_data->m_isOwner : false;
 176 }
 177
 178 void ArtworkModel::setFilePath(const QString &newPath, bool isOwner)
 179 {
 180         QMutexLocker lock(m_mutex);
 181         ArtworkModel_SharedData::detach(&m_data);
 182         if(!newPath.isEmpty())
 183         {
 184                 m_data = new ArtworkModel_SharedData(newPath, isOwner);
 185         }
 186 }
 187
 188 void ArtworkModel::clear(void)
 189 {
 190         QMutexLocker lock(m_mutex);
 191         ArtworkModel_SharedData::detach(&m_data);
 192 }