PluginLoader.cc 105 KB
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/*===========================================================================*\
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*                                                                            *
*                              OpenFlipper                                   *
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*      Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen       *
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*                           www.openflipper.org                              *
*                                                                            *
*--------------------------------------------------------------------------- *
*  This file is part of OpenFlipper.                                         *
*                                                                            *
*  OpenFlipper is free software: you can redistribute it and/or modify       *
*  it under the terms of the GNU Lesser General Public License as            *
*  published by the Free Software Foundation, either version 3 of            *
*  the License, or (at your option) any later version with the               *
*  following exceptions:                                                     *
*                                                                            *
*  If other files instantiate templates or use macros                        *
*  or inline functions from this file, or you compile this file and          *
*  link it with other files to produce an executable, this file does         *
*  not by itself cause the resulting executable to be covered by the         *
*  GNU Lesser General Public License. This exception does not however        *
*  invalidate any other reasons why the executable file might be             *
*  covered by the GNU Lesser General Public License.                         *
*                                                                            *
*  OpenFlipper is distributed in the hope that it will be useful,            *
*  but WITHOUT ANY WARRANTY; without even the implied warranty of            *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
*  GNU Lesser General Public License for more details.                       *
*                                                                            *
*  You should have received a copy of the GNU LesserGeneral Public           *
*  License along with OpenFlipper. If not,                                   *
*  see <http://www.gnu.org/licenses/>.                                       *
*                                                                            *
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\*===========================================================================*/

/*===========================================================================*\
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*                                                                            *
*   $Revision$                                                       *
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*   $LastChangedBy$                                         *
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*   $Date$                     *
*                                                                            *
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\*===========================================================================*/
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//=============================================================================
//
//  CLASS Core - IMPLEMENTATION of the Plugin Loading
//
//=============================================================================


//== INCLUDES =================================================================

// -------------------- mview
#include "Core.hh"

#include <QMenuBar>
#include <QToolBox>
#include <QMessageBox>
#include <QApplication>
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#include <QScrollArea>
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#include <QMessageBox>
#include <QtScript/QScriptValueIterator>
#include <QThread>
#include <QMutexLocker>
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#include <QPluginLoader>
#include "OpenFlipper/BasePlugin/BaseInterface.hh"
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#include "OpenFlipper/BasePlugin/AboutInfoInterface.hh"
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#include "OpenFlipper/BasePlugin/KeyInterface.hh"
#include "OpenFlipper/BasePlugin/BackupInterface.hh"
#include "OpenFlipper/BasePlugin/LoggingInterface.hh"
#include "OpenFlipper/BasePlugin/MouseInterface.hh"
#include "OpenFlipper/BasePlugin/PickingInterface.hh"
#include "OpenFlipper/BasePlugin/ToolboxInterface.hh"
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#include "OpenFlipper/BasePlugin/OptionsInterface.hh"
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#include "OpenFlipper/BasePlugin/ToolbarInterface.hh"
#include "OpenFlipper/BasePlugin/TextureInterface.hh"
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#include "OpenFlipper/BasePlugin/RenderInterface.hh"
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#include "OpenFlipper/BasePlugin/PostProcessorInterface.hh"
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#include "OpenFlipper/BasePlugin/MenuInterface.hh"
#include "OpenFlipper/BasePlugin/ContextMenuInterface.hh"
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#include "OpenFlipper/BasePlugin/ProcessInterface.hh"
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#include "OpenFlipper/BasePlugin/ViewInterface.hh"
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#include "OpenFlipper/BasePlugin/ViewModeInterface.hh"
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#include "OpenFlipper/BasePlugin/LoadSaveInterface.hh"
#include "OpenFlipper/BasePlugin/StatusbarInterface.hh"
#include "OpenFlipper/BasePlugin/INIInterface.hh"
#include "OpenFlipper/BasePlugin/FileInterface.hh"
#include "OpenFlipper/BasePlugin/RPCInterface.hh"
#include "OpenFlipper/BasePlugin/ScriptInterface.hh"
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#include "OpenFlipper/BasePlugin/SecurityInterface.hh"
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#include "OpenFlipper/BasePlugin/SelectionInterface.hh"
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#include "OpenFlipper/BasePlugin/TypeInterface.hh"
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#include "OpenFlipper/BasePlugin/PluginConnectionInterface.hh"
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#include "OpenFlipper/common/RendererInfo.hh"
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#include "OpenFlipper/INIFile/INIFile.hh"

#include "OpenFlipper/common/GlobalOptions.hh"


#include <ACG/QtWidgets/QtFileDialog.hh>
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#include "OpenFlipper/widgets/PluginDialog/PluginDialog.hh"
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#include <deque>
#include <limits>

/**
 * The number of plugins to load simultaneously.
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 */
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static const int PRELOAD_THREADS_COUNT = (QThread::idealThreadCount() != -1) ? QThread::idealThreadCount() : 8;
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class PreloadAggregator {
    public:
        PreloadAggregator() : expectedLoaders_(0) {}

        /**
         * Intended to be called by a PreloadThread
         * before count subsequent calls to loaderReady().
         * May be called multiple times in which case
         * the counts accumulate.
         *
         * @param count The number of times the calling
         * PreloadThread intents to call loaderReady().
         */
        void expectLoaders(int count) {
            QMutexLocker loadersLock(&loadersMutex_);
            expectedLoaders_ += count;
        }

        /**
         * Intended to be called by a PreloadThread.
         *
         * Transfers ownership of the supplied loader
         * to the PreloadAggregator.
         */
        void loaderReady(QPluginLoader *loader) {
            QMutexLocker loadersLock(&loadersMutex_);
            loaders_.push_back(loader);
            --expectedLoaders_;
            pluginAvailable_.wakeOne();
        }

        /**
         * If there are still loaders expected, block
         * until the next loader becomes available and return
         * it.
         *
         * Ownership of the returned object is transferred
         * to the caller. (I.e. the caller has to delete it.)
         *
         * @return Null if there are no more loaders expected.
         * The next loader, otherwise.
         */
        QPluginLoader *waitForNextLoader() {
            QMutexLocker loadersLock(&loadersMutex_);
            if (loaders_.empty()) {
                if (expectedLoaders_ > 0) {
                    pluginAvailable_.wait(&loadersMutex_);
                } else {
                    return 0;
                }
            }

            /*
             * At this point, it is guaranteed that
             * loaders_.size() > 0.
             */
            QPluginLoader *result = loaders_.front();
            loaders_.pop_front();
            return result;
        }

    protected:
        std::deque<QPluginLoader *> loaders_;
        QWaitCondition pluginAvailable_;
        QMutex loadersMutex_;

        int expectedLoaders_;
};

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class PreloadThread : public QThread
{
  public: 
    
    /** \brief Preload thread constructor
    *
    * This constructor initializes the preloading thread.
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    *
    * @param aggregator aggregator managing the different threads
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    */
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    PreloadThread(PreloadAggregator *aggregator) : aggregator_(aggregator) {
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    }
  
  public:
    
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    void addFilename(const QString &filename) {
        QMutexLocker filenamesLock(&filenamesMutex_);
        filenames_.push_back(filename);
        aggregator_->expectLoaders(1);
    }

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    /** \brief preload function
    *
    * This function is used in the thread to preload a plugin. The name is given in the constructor.
    */
    void run() {
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      for (;;) {
          QString fileName;
          {
              /*
               * Just to be on the safe side, we protect
               * filenames_. (addFilename() could be called from
               * a different thread.)
               */
              QMutexLocker filenamesLock(&filenamesMutex_);
              if (filenames_.empty()) break;
              fileName = filenames_.front();
              filenames_.pop_front();
          }

          QPluginLoader *loader = new QPluginLoader;
          loader->setFileName(fileName);
          loader->load();
          aggregator_->loaderReady(loader);
      }
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    }
    
  private:
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    std::deque<QString> filenames_;
    QMutex filenamesMutex_;
    PreloadAggregator *aggregator_;
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};

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/**
 * @brief Defines the order in which plugins have to be loaded.
 *
 * First load all type Plugins to register the dataTypes to the core
 * Than load the file plugins to load objects
 * Next is textureControl to control texture based properties
 * Then load everything else.
 */
class PluginInitializationOrder {
    public:
        int getTypeOrdinal(const QString &name) const {
            const QString basename = QFileInfo(name).baseName();
            if (basename.contains("Plugin-Type"))
                return 0;
            else if (basename.contains("Plugin-File"))
                return 1;
            else if (basename.contains("TextureControl"))
                return 2;
            else
                return 3;

        }
        bool operator() (const QString &a, const QString &b) const {
            const int typeA = getTypeOrdinal(a);
            const int typeB = getTypeOrdinal(b);
            if (typeA != typeB) { return typeA < typeB; }
            return a < b;
        }

        bool operator() (const QPluginLoader *a, const QPluginLoader *b) const {
            return operator() (a->fileName(), b->fileName());
        }
};
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//== IMPLEMENTATION ==========================================================


bool Core::checkSlot(QObject* _plugin , const char* _slotSignature) {
  const QMetaObject* meta = _plugin->metaObject();
  int id = meta->indexOfSlot( QMetaObject::normalizedSignature( _slotSignature ) );
  return ( id != -1 );
}

bool Core::checkSignal(QObject* _plugin , const char* _signalSignature) {
  const QMetaObject* meta = _plugin->metaObject();
  int id = meta->indexOfSignal( QMetaObject::normalizedSignature( _signalSignature ) );
  return ( id != -1 );
}

 /** Load plugins from dir Plugins. The plugin information gets stored, toolbox and menu entries are created and the required signals and slots are connected.
  */
void Core::loadPlugins()
{
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  QString licenseTexts = "";
  
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  //try to load plugins from new location
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  QDir tempDir = QDir(OpenFlipper::Options::pluginDir());
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  // Possible Plugin extensions
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  // Windows gets DLLs
  // Mac and Linux use so
  // We don't use the dylib extension on Mac at the moment.
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  QStringList filter;
  if ( OpenFlipper::Options::isWindows() )
    filter << "*.dll";
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  else 
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    filter << "*.so";
  
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  // Get all files in the Plugin dir
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  QStringList pluginlist = tempDir.entryList(filter,QDir::Files);
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  // Convert local file path to absolute path
  for (int i=0; i < pluginlist.size(); i++) {
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     pluginlist[i] = tempDir.absoluteFilePath(pluginlist[i]);
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  }

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  // get all Plugin Names which will not be loaded
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  QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames", QStringList()).toStringList();
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  // Output info about additional plugins
  for ( int i = 0 ; i < dontLoadPlugins.size(); ++i) 
    emit log(LOGOUT,tr("dontLoadPlugins Plugin from ini file: %1").arg( dontLoadPlugins[i] ) );
  
  // get all Plugins which should be loaded in addition to the standard plugins 
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  QStringList additionalPlugins = OpenFlipperSettings().value("PluginControl/AdditionalPlugins", QStringList()).toStringList();
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  // Output info about additional plugins
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  for ( int i = 0 ; i < additionalPlugins.size(); ++i) {
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    emit log(LOGOUT,tr("Additional Plugin from file: %1").arg( additionalPlugins[i] ) );
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  }
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  // Prepend the additional Plugins to the plugin list
  pluginlist = additionalPlugins << pluginlist;
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  /*
   * Note: This call is not necessary, anymore. Initialization order
   * is determined later.
   */
  std::sort(pluginlist.begin(), pluginlist.end(), PluginInitializationOrder());
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  for ( int i = 0 ; i < dontLoadPlugins.size(); ++i )
    emit log(LOGWARN,tr("Skipping Plugins :\t %1").arg( dontLoadPlugins[i] ) );
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  emit log(LOGOUT,"================================================================================");
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  QTime time;
  
  time.start();
  
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  PreloadAggregator preloadAggregator;
  std::vector< PreloadThread* > loaderThreads(PRELOAD_THREADS_COUNT);

  /*
   * Initialize loaderThreads.
   */
  for (std::vector< PreloadThread* >::iterator it = loaderThreads.begin();
          it != loaderThreads.end(); ++it) {
      *it = new PreloadThread(&preloadAggregator);
  }
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  /*
   * Distribute plugins onto loader threads in a round robin fashion.
   * (only load them in seperate thread. Instance will be created in main thread)
   */
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  for ( int i = 0 ; i < pluginlist.size() ; ++i) {
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    loaderThreads[i % loaderThreads.size()]->addFilename(pluginlist[i]);
  }

  /*
   * Start plugin preloading.
   */
  for (std::vector< PreloadThread* >::iterator it = loaderThreads.begin();
          it != loaderThreads.end(); ++it) {
      (*it)->start();
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  }
  
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  /*
   * Wait for the plugins to get preloaded
   */
  std::vector<QPluginLoader*> loadedPlugins;
  loadedPlugins.reserve(pluginlist.size());

  for (QPluginLoader *loader = preloadAggregator.waitForNextLoader(); loader != 0;
          loader = preloadAggregator.waitForNextLoader()) {

      loadedPlugins.push_back(loader);

      if ( OpenFlipper::Options::gui() && OpenFlipperSettings().value("Core/Gui/splash",true).toBool() ) {
        splashMessage_ = tr("Loading Plugin %1/%2").arg(loadedPlugins.size()).arg(pluginlist.size()) ;
        splash_->showMessage( splashMessage_ , Qt::AlignBottom | Qt::AlignLeft , Qt::white);
      }
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  }

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  /*
   * Finalize PreloadThreads.
   */
  for (std::vector< PreloadThread* >::iterator it = loaderThreads.begin();
          it != loaderThreads.end(); ++it) {
      (*it)->wait();
      delete *it;
  }

  /*
   * Initialize preloaded plugins in the correct order.
   */
  std::sort(loadedPlugins.begin(), loadedPlugins.end(), PluginInitializationOrder());
  for (std::vector<QPluginLoader*>::iterator it = loadedPlugins.begin();
          it != loadedPlugins.end(); ++it) {

      if ( OpenFlipper::Options::gui() && OpenFlipperSettings().value("Core/Gui/splash",true).toBool() ) {
        splashMessage_ = tr("Initializing Plugin %1/%2")
                .arg(std::distance(loadedPlugins.begin(), it) + 1)
                .arg(loadedPlugins.size());
        splash_->showMessage( splashMessage_ , Qt::AlignBottom | Qt::AlignLeft , Qt::white);
      }

      if ((*it)->instance() != 0 ) {
        QString pluginLicenseText  = "";
        loadPlugin((*it)->fileName(),true,pluginLicenseText, (*it)->instance());
        licenseTexts += pluginLicenseText;
      } else {
        emit log(LOGERR,tr("Unable to load Plugin :\t %1").arg( (*it)->fileName() ) );
        emit log(LOGERR,tr("Error was : ") + (*it)->errorString() );
        emit log(LOGOUT,"================================================================================");
      }
      delete *it;
  }

  emit log(LOGINFO, tr("Total time needed to load plugins was %1 ms.").arg(time.elapsed()));

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  splashMessage_ = "";
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  if ( licenseTexts != "" ) {
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    if ( OpenFlipper::Options::gui() ) {
      
      // split for each license block
      QStringList licenseBlocks = licenseTexts.split("==");

      // Cleanup lists to get only the ones containing valid plugins.
      for ( QStringList::iterator it = licenseBlocks.begin(); it != licenseBlocks.end() ; ++it )
        if ( ! it->contains("PluginName") ) {
          licenseBlocks.erase(it);
          it = licenseBlocks.begin();
        }
      
      // sort by the contact mails
      QMap< QString , QString > contacts;
      
      for ( QStringList::iterator it = licenseBlocks.begin(); it != licenseBlocks.end() ; ++it ) {
        QStringList lines = it->split("\n");
        
        lines = lines.filter ( "Contact mail", Qt::CaseInsensitive );
        
        // Corect one found:
        if (lines.size() == 1)  {
          QString mail = lines[0].section(":",-1).simplified();
          QString list = contacts.take(mail);
          list.append(*it);
          contacts.insert(mail,list);
        } else {
          emit log(LOGWARN,tr("Can't extract mail contact from license request"));
        }
          
      }
      
      for ( QMap<QString , QString>::iterator it = contacts.begin() ; it != contacts.end() ; ++it ) {
        
        QStringList request = it.value().split("\n");
        
        // Cleanup lists to get only the relevant part
        for ( QStringList::iterator lit = request.begin(); lit != request.end() ; ++lit ) {
          
          if ( lit->contains("Message:")  ) {
            *lit = lit->section(":",-1).simplified();
          }
          
          if ( lit->contains("Contact mail:")  ) {
            *lit = lit->section(":",-1).simplified();
          }
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        }
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        QDialog licenseBox;
          
        QTextEdit *edit = new QTextEdit(&licenseBox);
        edit->setText(request.join("\n"));

        QLabel* mailLabel = new QLabel(&licenseBox);
        mailLabel->setText(tr("The text has been copied to your clipboard. Open in Mail program?"));

        QPushButton* noButton = new QPushButton(&licenseBox);
        noButton->setText(tr("No"));
        connect( noButton, SIGNAL(clicked ()), &licenseBox, SLOT(reject()) );

        QPushButton* yesButton = new QPushButton(&licenseBox);
        yesButton->setText(tr("Yes"));
        connect( yesButton, SIGNAL(clicked ()), &licenseBox, SLOT(accept()) );

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        QGridLayout *layout = new QGridLayout;
        layout->addWidget(edit,0,0,1,2);
        layout->addWidget(mailLabel,1,0,1,2);
        layout->addWidget(noButton,2,0);
        layout->addWidget(yesButton,2,1);
        licenseBox.setLayout(layout);
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        licenseBox.resize(500,500);
        licenseBox.setModal(true);
        licenseBox.setWindowTitle(tr("Plugin License check failed, issuer is: %1").arg( it.key() ));  
        int userAnswer =licenseBox.exec();

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        // set a text to the Clipboard
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        QClipboard *cb = QApplication::clipboard();
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        cb->setText(request.join("\n"));
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        if ( userAnswer == 1 ) {
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           QString url = "mailto:" + it.key();
           url += "?subject=License Request&body=";
#ifdef WIN32
           url += request.join(";;");
#else
           url += request.join("\n");
#endif
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           QUrl encodedURL(url, QUrl::TolerantMode);
           QDesktopServices::openUrl(encodedURL);
        }
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      }

      
    } else {
      emit log(LOGWARN,tr("Plugin License check failed: "));
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      std::cerr << licenseTexts.toStdString() << std::endl;
    }
  } 
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  emit pluginsInitialized();

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  emit log(LOGOUT,tr("Loaded %n Plugin(s)","",plugins_.size()) );
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}

/** @brief slot for loading Plugins
 */
void Core::slotLoadPlugin(){

  if ( OpenFlipper::Options::nogui() )
    return;

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  // Setup filters for possible plugin extensions
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  // Windows gets DLLs
  // Mac and Linux use so
  // We don't use the dylib extension on Mac at the moment.
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  QString filter;
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  if ( OpenFlipper::Options::isWindows() )
    filter = "Plugins (*.dll)";
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  else 
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    filter = "Plugins (*.so)";

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  // Ask the user to select the file to load
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  QString filename = ACG::getOpenFileName(coreWidget_,tr("Load Plugin"),filter, OpenFlipperSettings().value("Core/CurrentDir").toString() );
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  if (filename.isEmpty())
    return;

  // get the plugin name
  // and check if Plugin is in the dontLoad List
  QPluginLoader loader( filename );
  QObject *plugin = loader.instance();
  QString name;

  // Check if a plugin has been loaded
  if (plugin) {
    // Check if it is a BasePlugin
    BaseInterface* basePlugin = qobject_cast< BaseInterface * >(plugin);
    if ( basePlugin ) {
      name = basePlugin->name();
    }else
      return;
  }else
    return;

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  // Ask if the plugin is on the block list
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  QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames", QStringList()).toStringList();
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  if (dontLoadPlugins.contains(name)){
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      int ret = QMessageBox::question(0, tr("Plugin Loading Prevention"),
                   tr("OpenFlipper is currently configured to prevent loading this plugin.\n"
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                      "Do you want to enable this plugin permanently?"),
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                   QMessageBox::Yes | QMessageBox::No,
                   QMessageBox::Yes);
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      if (ret == QMessageBox::Yes) {
        dontLoadPlugins.removeAll(name);
        OpenFlipperSettings().setValue("PluginControl/DontLoadNames",dontLoadPlugins);
      } else
         return;
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  }
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  // check if the plugin is not on the additional plugin list
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  QStringList additionalPlugins = OpenFlipperSettings().value("PluginControl/AdditionalPlugins", QStringList()).toStringList();
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  if (!additionalPlugins.contains(name)){
    int ret = QMessageBox::question(0, tr("Plugin Loading ..."),
                                       tr("Should OpenFlipper load this plugin on next startup?"),
                                    QMessageBox::Yes | QMessageBox::No,
                                    QMessageBox::Yes);
    if (ret == QMessageBox::Yes) {
      additionalPlugins << filename;
      std::cerr << "Added: " << filename.toStdString() << std::endl;
      OpenFlipperSettings().setValue("PluginControl/AdditionalPlugins",additionalPlugins);
    }
  }
  
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  QString licenseText = "";
  loadPlugin(filename,false,licenseText);
  
  if ( licenseText != "" ) {
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    if ( OpenFlipper::Options::gui() ) {
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      QMessageBox::warning ( 0, tr("Plugin License check failed"),  licenseText );
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      std::cerr << "OpenURL: " << std::endl;
      QDesktopServices::openUrl(QUrl(tr("mailto:contact@openflipper.com?subject=License Request&body=%1").arg(licenseText), QUrl::TolerantMode));
    } else {
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      std::cerr << "Plugin License check failed" << std::endl;
      std::cerr << licenseText.toStdString() << std::endl;
    }
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  }
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}

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/** @brief slot for showing loaded Plugins
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 */
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void Core::slotShowPlugins(){
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  if ( OpenFlipper::Options::gui() ){

    int ret = 0;

    while (ret == 0){

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      PluginDialog* dialog = new PluginDialog(plugins_, coreWidget_);
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      //connect signals
      connect(dialog, SIGNAL( loadPlugin() ), this, SLOT( slotLoadPlugin() ));
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      connect(dialog, SIGNAL(blockPlugin(const QString&)), this, SLOT(slotBlockPlugin(const QString&)));
      connect(dialog, SIGNAL(unBlockPlugin(const QString&)), this, SLOT(slotUnBlockPlugin(const QString&)));
      connect(dialog, SIGNAL(loadPlugin(const QString& ,const bool , QString& , QObject* )),
          this,SLOT(loadPlugin(const QString& ,const bool , QString& , QObject* )));
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      //if a plugin was deleted/loaded the dialog returns 0 and it needs to be loaded again
      ret = dialog->exec();

      delete dialog;
    }
  }
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}

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void Core::slotBlockPlugin(const QString &_name)
{
  QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames",QStringList()).toStringList();
  if ( !dontLoadPlugins.contains(_name) ){
    dontLoadPlugins << _name;
    OpenFlipperSettings().setValue("PluginControl/DontLoadNames",dontLoadPlugins);
  }
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  for (size_t i = 0; i < plugins_.size();++i)
    if (plugins_[i].name == _name)
      plugins_[i].status = PluginInfo::BLOCKED;
}
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void Core::slotUnBlockPlugin(const QString &_name)
{
  QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames",QStringList()).toStringList();
  dontLoadPlugins.removeAll(_name);
  OpenFlipperSettings().setValue("PluginControl/DontLoadNames",dontLoadPlugins);
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  for (size_t i = 0; i < plugins_.size();++i)
      if (plugins_[i].name == _name)
        plugins_[i].status = PluginInfo::UNLOADED;
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}

/** @brief Load a Plugin with given filename
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 *  @param _filename complete path + filename of the plugin
 *  @param _silent if 'true': user isn't asked what to do if a plugin is already loaded
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 *  @param _licenseErrors String will be epty when no license issues occured, otherwise it contains the required information for obtaining a license
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 *  @param _plugin You can provide a preloaded plugin here. If this is 0 the filename will be used to load the plugin.
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 */
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void Core::loadPlugin(const QString& _filename,const bool _silent, QString& _licenseErrors, QObject* _plugin){
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  _licenseErrors = "";
  
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  // Only load .dll under windows
  if ( OpenFlipper::Options::isWindows() ) {
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    QString dllname = _filename;
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    if ( ! dllname.endsWith( ".dll" ) )
      return;
  }
  // Only load .so under linux
  if ( OpenFlipper::Options::isLinux() ) {
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    QString soname = _filename;
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    if ( ! soname.endsWith( ".so" ) )
      return;
  }

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  // This will be the reference to our plugin
  QObject *plugin = 0;
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  // Try to open the file if we did not get a plugin,
  // Otherwise use the supplied plugin pointer
  if ( _plugin == 0 ) {
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    QPluginLoader loader( _filename );
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    plugin = loader.instance();  
    
    if ( !plugin) {
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      emit log(LOGERR,tr("Unable to load Plugin :\t %1").arg( _filename ) );
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      emit log(LOGERR,tr("Error was : ") + loader.errorString() );
      emit log(LOGOUT,"================================================================================");       
    }
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    emit log (LOGOUT,tr("Plugin loaded: \t %1").arg(_filename));
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  } else {
      plugin = _plugin;
  }
  
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  // Check if a plugin has been loaded
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  PluginInfo info;
  int alreadyLoadedAt = -1;
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  for (unsigned int k=0; k < plugins_.size(); k++)
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  {
    if (plugins_[k].path == _filename)
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      alreadyLoadedAt = static_cast<int>(k);
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  }
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  info.status = PluginInfo::FAILED;
  info.path = _filename;
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  QString supported;
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  emit log(LOGOUT,tr("Location : \t %1").arg( _filename) );
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  // Check if it is a BasePlugin
  BaseInterface* basePlugin = qobject_cast< BaseInterface * >(plugin);
  if ( basePlugin ) {
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    //set basic information about plugin
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    info.name = basePlugin->name();
    info.rpcName = info.name.remove(" ").toLower();
    info.description = basePlugin->description();
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    QStringList additionalPlugins = OpenFlipperSettings().value("PluginControl/AdditionalPlugins", QStringList()).toStringList();
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    info.buildIn = !additionalPlugins.contains(info.path);
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    emit log(LOGOUT,tr("Found Plugin : \t %1").arg(basePlugin->name()) );
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    if ( OpenFlipper::Options::gui() && OpenFlipperSettings().value("Core/Gui/splash",true).toBool() ) {
      splashMessage_ = splashMessage_ + " " + basePlugin->name() ;
      splash_->showMessage( splashMessage_ , Qt::AlignBottom | Qt::AlignLeft , Qt::white);
    }
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    //Check if plugin is already loaded
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    for (unsigned int k=0; k < plugins_.size(); k++){
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        QString name_nospace =  basePlugin->name();
        name_nospace.remove(" ");

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        if (plugins_[k].name == name_nospace && plugins_[k].path != _filename && plugins_[k].status == PluginInfo::LOADED){
          if (_silent || OpenFlipper::Options::nogui() ){ //dont load the plugin
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            emit log(LOGWARN, tr("\t\t\t Already loaded from %1").arg( plugins_[k].path) );
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            emit log(LOGOUT,"================================================================================");
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            info.description = basePlugin->description() + tr(" *Already loaded.*");
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            return;
        }else{ //ask the user
          int ret = QMessageBox::question(coreWidget_,
                                          tr("Plugin already loaded"),
                                          tr("A Plugin with the same name was already loaded from %1.\n" 
                                              "You can only load the new plugin if you unload the existing one first.\n\n"
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                                              "Do you want to unload the existing plugin first?").arg( plugins_[k].path),
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                                          QMessageBox::Yes|QMessageBox::No, QMessageBox::No);
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          if (ret == QMessageBox::No)
          {
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            emit log(LOGWARN, tr("\t\t\t Already loaded from %1.").arg( plugins_[k].path));
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            emit log(LOGOUT,"================================================================================");
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            info.description = basePlugin->description() + tr(" *Already loaded.*");
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            return;
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          }
        }
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      }
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    }
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    QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames",QStringList()).toStringList();
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    if ( dontLoadPlugins.contains(basePlugin->name(), Qt::CaseInsensitive) ) {
      emit log(LOGWARN,tr("OpenFlipper.ini prevented Plugin %1 from being loaded! ").arg( basePlugin->name() ));
      emit log(LOGOUT,"================================================================================");
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      info.status = PluginInfo::BLOCKED;
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      return;
    }
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    //Check if it is a BasePlugin
    SecurityInterface * securePlugin = qobject_cast< SecurityInterface * >(plugin);
    if ( securePlugin ) {
      emit log(LOGINFO,tr("Plugin uses security interface. Trying to authenticate against plugin ..."));
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      bool success = false;
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      QMetaObject::invokeMethod(plugin,"authenticate", Q_RETURN_ARG( bool , success ) ) ;
      
      QString message = "";
      QMetaObject::invokeMethod(plugin,"licenseError", Q_RETURN_ARG( QString , message ) ) ;
      _licenseErrors = message;
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      if ( success )
        emit log(LOGINFO,tr("... ok. Loading plugin "));
      else {
        emit log(LOGERR,tr("... failed. Plugin access denied."));
        emit log(LOGOUT,"================================================================================");
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        info.description = basePlugin->description() + tr(" *Plugin access denied.*");
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        // Abort here, as the plugin will not do anything else until correct authentication.
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        return;
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      }
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    }
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    emit log(LOGOUT,tr("Plugin Desciption :\t %1 ").arg( basePlugin->description()) );
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    supported = "BaseInterface ";
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    info.plugin        = plugin;
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    if ( checkSlot(plugin,"version()") )
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      info.version = basePlugin->version();
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    else
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      info.version = QString::number(-1);
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    if ( OpenFlipper::Options::nogui() ) {
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      if ( ! checkSlot( plugin , "noguiSupported()" ) ) {
        emit log(LOGWARN,tr("Running in nogui mode which is unsupported by this plugin, skipping") );
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        emit log(LOGOUT,"================================================================================");
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        return;
      }

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    }
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    // Check for baseInterface of old style!
    if ( checkSignal(plugin,"updated_objects(int)") ) {
      log(LOGERR,tr("Plugin Uses old style updated_objects! Convert to updatedObject!"));
      emit log(LOGOUT,"================================================================================");
      return;
    }
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    if ( checkSignal(plugin,"update_view()") ) {
      log(LOGERR,tr("Plugin Uses old style update_view! Convert to updateView!"));
      emit log(LOGOUT,"================================================================================");
      return;
    }
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    if ( checkSignal(plugin,"updateView()") )
      connect(plugin,SIGNAL(updateView()),this,SLOT(updateView()));
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    if ( checkSignal(plugin,"updatedObject(int)") && checkSignal(plugin,"updatedObject(int,const UpdateType&)") ){
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      log(LOGERR,tr("Plugin uses deprecated and(!) new updatedObject. Only new updatedObject will be active."));
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      connect(plugin,SIGNAL(updatedObject(int,const UpdateType&)),this,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
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    } else {
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      if ( checkSignal(plugin,"updatedObject(int)") ){
        log(LOGWARN,tr("Plugin uses deprecated updatedObject."));
        connect(plugin,SIGNAL(updatedObject(int)),this,SLOT(slotObjectUpdated(int)), Qt::DirectConnection);
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      }
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      if ( checkSignal(plugin,"updatedObject(int,const UpdateType&)") )
        connect(plugin,SIGNAL(updatedObject(int,const UpdateType&)),this,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
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    }
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    if ( checkSlot( plugin , "slotObjectUpdated(int)" ) && checkSlot( plugin , "slotObjectUpdated(int,const UpdateType&)" ) ){
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      log(LOGERR,tr("Plugin uses deprecated and(!) new slotObjectUpdated. Only new slotObjectUpdated will be active."));
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      connect(this,SIGNAL(signalObjectUpdated(int,const UpdateType&)),plugin,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
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    } else {
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      if ( checkSlot( plugin , "slotObjectUpdated(int)" ) ){
        log(LOGWARN,tr("Plugin uses deprecated slotObjectUpdated."));
        connect(this,SIGNAL(signalObjectUpdated(int)),plugin,SLOT(slotObjectUpdated(int)), Qt::DirectConnection);
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      }
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      if ( checkSlot( plugin , "slotObjectUpdated(int,const UpdateType&)" ) )
        connect(this,SIGNAL(signalObjectUpdated(int,const UpdateType&)),plugin,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
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    }

    if ( checkSignal(plugin,"objectPropertiesChanged(int)")) {
      emit log (LOGERR,tr("Signal objectPropertiesChanged(int) is deprecated. " ));
      emit log (LOGERR,tr("The signal will be automatically emitted by the object that has been changed and the core will deliver it to the plugins!. "));
      emit log (LOGERR,tr("Please remove this signal from your plugins!. "));
    }
    
    if ( checkSlot( plugin , "slotViewChanged()" ) )
      connect(this,SIGNAL(pluginViewChanged()),plugin,SLOT(slotViewChanged()), Qt::DirectConnection);
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    if ( checkSlot( plugin , "slotSceneDrawn()" ) )
      connect(this,SIGNAL(pluginSceneDrawn()),plugin,SLOT(slotSceneDrawn()), Qt::DirectConnection);

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    if ( checkSlot( plugin , "slotDrawModeChanged(int)" ) )
          connect(coreWidget_,SIGNAL(drawModeChanged(int)),plugin,SLOT(slotDrawModeChanged(int)), Qt::DirectConnection);

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    if ( checkSlot(plugin,"slotObjectPropertiesChanged(int)"))
      connect(this,SIGNAL(objectPropertiesChanged(int)),plugin,SLOT(slotObjectPropertiesChanged(int)), Qt::DirectConnection);
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    if ( checkSignal(plugin,"visibilityChanged()" ) )
      emit log (LOGERR,tr("Signal visibilityChanged() now requires objectid or -1 as argument " ));
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    if ( checkSignal(plugin,"visibilityChanged(int)") ) {
      emit log (LOGERR,tr("Signal visibilityChanged(int) is deprecated! " ));
      emit log (LOGERR,tr("If an object changes its visibility, it will call the required functions automatically." ));
      emit log (LOGERR,tr("If you change a scenegraph node, call nodeVisibilityChanged(int). See docu of this function for details." ));
    }
    
    if ( checkSignal(plugin,"nodeVisibilityChanged(int)") )
      connect(plugin,SIGNAL(nodeVisibilityChanged(int)),this,SLOT(slotVisibilityChanged(int)), Qt::DirectConnection);
    
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    if ( checkSlot(plugin,"slotVisibilityChanged(int)") )
      connect(this,SIGNAL(visibilityChanged(int)),plugin,SLOT(slotVisibilityChanged(int)), Qt::DirectConnection);
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    if ( checkSignal(plugin,"activeObjectChanged()" ) )
      emit log (LOGERR,tr("Signal activeObjectChanged() is now objectSelectionChanged( int _objectId ) ") );
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    if ( checkSlot(plugin,"slotActiveObjectChanged()" ) )
      emit log (LOGERR,tr("Slot slotActiveObjectChanged() is now slotObjectSelectionChanged( int _objectId ) ") );
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    if ( checkSlot(plugin,"slotAllCleared()") )
      connect(this,SIGNAL(allCleared()),plugin,SLOT(slotAllCleared()));
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    if ( checkSignal(plugin,"objectSelectionChanged(int)") ) {
      emit log (LOGERR,tr("Signal objectSelectionChanged(in) is deprecated!") );
      emit log (LOGERR,tr("If the selection for an object is changed, the core will emit the required signals itself!") );
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    }

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    if ( checkSlot( plugin , "slotObjectSelectionChanged(int)" ) )
      connect(this,SIGNAL(objectSelectionChanged(int)),plugin,SLOT(slotObjectSelectionChanged(int) ), Qt::DirectConnection);
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    if ( checkSlot( plugin , "pluginsInitialized()" ) )
      connect(this,SIGNAL(pluginsInitialized()),plugin,SLOT(pluginsInitialized()), Qt::DirectConnection);
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    if ( checkSignal(plugin,"setSlotDescription(QString,QString,QStringList,QStringList)") )
      connect(plugin, SIGNAL(setSlotDescription(QString,QString,QStringList,QStringList)),
              this,   SLOT(slotSetSlotDescription(QString,QString,QStringList,QStringList)) );
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    // =============================================
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    // Function allowing switching of renderers from other plugins
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    // =============================================
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    if ( checkSignal(plugin,"setRenderer(unsigned int,QString)" ) ) {
      connect(plugin,SIGNAL(setRenderer(unsigned int,QString)),this,SLOT(slotSetRenderer(unsigned int,QString)));
    }

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    if ( checkSignal(plugin,"getCurrentRenderer(unsigned int,QString&)" ) ) {
      connect(plugin,SIGNAL(getCurrentRenderer(unsigned int,QString&)),this,SLOT(slotGetCurrentRenderer(unsigned int,QString&)), Qt::DirectConnection);
    }


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  }
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  //Check if the plugin supports Logging
  LoggingInterface* logPlugin = qobject_cast< LoggingInterface * >(plugin);
  if ( logPlugin ) {
    supported = supported + "Logging ";
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    // Create intermediate logger class which will mangle the output
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    PluginLogger* newlog = new PluginLogger(info.name);
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    loggers_.push_back(newlog);
    connect(plugin,SIGNAL(log(Logtype, QString )),newlog,SLOT(slotLog(Logtype, QString )),Qt::DirectConnection);
    connect(plugin,SIGNAL(log(QString )),newlog,SLOT(slotLog(QString )),Qt::DirectConnection);
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    // Connect it to the core widget logger
    if ( OpenFlipper::Options::gui() )
      connect(newlog,SIGNAL(log(Logtype, QString )),coreWidget_,SLOT(slotLog(Logtype, QString )),Qt::DirectConnection);
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    // connection to console logger
    connect(newlog,SIGNAL(log(Logtype, QString )),this,SLOT(slotLog(Logtype, QString )),Qt::DirectConnection);
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    // connection to file logger
    connect(newlog,SIGNAL(log(Logtype, QString )),this,SLOT(slotLogToFile(Logtype, QString )),Qt::DirectConnection);
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    // connection to external plugin logger
    if ( checkSlot(plugin,"logOutput(Logtype,QString)") )
      connect(this,SIGNAL(externalLog(Logtype,QString)), plugin, SLOT(logOutput(Logtype,QString)) ) ;
  }
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  //Check if the plugin supports Menubar-Interface
  MenuInterface* menubarPlugin = qobject_cast< MenuInterface * >(plugin);
  if ( menubarPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "Menubar ";

    if ( checkSignal(plugin,"addMenubarAction(QAction*,QString)") )
      connect(plugin      , SIGNAL(addMenubarAction(QAction*,QString)),
              coreWidget_ , SLOT(slotAddMenubarAction(QAction*,QString)),Qt::DirectConnection);
    if ( checkSignal(plugin,"getMenubarMenu (QString,QMenu*&,bool)") )
      connect(plugin      , SIGNAL(getMenubarMenu (QString,QMenu*&,bool)),
              coreWidget_ , SLOT(slotGetMenubarMenu (QString,QMenu*&,bool)),Qt::DirectConnection);
  }
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  //Check if the plugin supports ContextMenuInterface
  ContextMenuInterface* contextMenuPlugin = qobject_cast< ContextMenuInterface * >(plugin);
  if ( contextMenuPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "ContextMenu ";
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    if ( checkSignal(plugin,"addContextMenuItem(QAction*,ContextMenuType)") )
      connect(plugin      , SIGNAL(addContextMenuItem(QAction*,ContextMenuType)),
              coreWidget_ , SLOT(slotAddContextItem(QAction*,ContextMenuType)),Qt::DirectConnection);
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    if ( checkSignal(plugin,"addContextMenuItem(QAction*,DataType,ContextMenuType)") )
      connect(plugin      , SIGNAL(addContextMenuItem(QAction*,DataType,ContextMenuType)),
              coreWidget_ , SLOT(slotAddContextItem(QAction*,DataType,ContextMenuType)),Qt::DirectConnection);
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    if ( checkSignal(plugin,"hideContextMenu()") )
          connect(plugin      , SIGNAL(hideContextMenu()),
                  coreWidget_ , SLOT(slotHideContextMenu()),Qt::DirectConnection);

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    if ( checkSlot(plugin,"slotUpdateContextMenu(int)") )
      connect(coreWidget_ , SIGNAL(updateContextMenu(int)),
              plugin      , SLOT(slotUpdateContextMenu(int)),Qt::DirectConnection);
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    if ( checkSlot(plugin,"slotUpdateContextMenuNode(int)") )
      connect(coreWidget_ , SIGNAL(updateContextMenuNode(int)),
              plugin      , SLOT(slotUpdateContextMenuNode(int)),Qt::DirectConnection);
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    if ( checkSlot(plugin,"slotUpdateContextMenuBackground()") )
      connect(coreWidget_ , SIGNAL(updateContextMenuBackground()),
              plugin      , SLOT(slotUpdateContextMenuBackground()),Qt::DirectConnection);
  }
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  //Check if the plugin supports Toolbox-Interface
  ToolboxInterface* toolboxPlugin = qobject_cast< ToolboxInterface * >(plugin);
  if ( toolboxPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "Toolbox ";
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    if ( checkSignal(plugin, "addToolbox(QString,QWidget*)"))
      connect(plugin, SIGNAL( addToolbox(QString,QWidget*) ),
              this, SLOT( addToolbox(QString,QWidget*) ),Qt::DirectConnection );
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    if ( checkSignal(plugin, "addToolbox(QString,QWidget*,QIcon*)"))
      connect(plugin, SIGNAL( addToolbox(QString,QWidget*,QIcon*) ),
              this, SLOT( addToolbox(QString,QWidget*,QIcon*) ),Qt::DirectConnection );
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  }
  
  //Check if the plugin supports ViewMode-Interface
  ViewModeInterface* viewModePlugin = qobject_cast< ViewModeInterface * >(plugin);
  if ( viewModePlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "ViewMode ";
    
    if ( checkSignal(plugin, "defineViewModeToolboxes(QString,QStringList)"))
      connect(plugin, SIGNAL( defineViewModeToolboxes(QString, QStringList) ),
              coreWidget_, SLOT( slotAddViewModeToolboxes(QString, QStringList) ),Qt::DirectConnection );
              
    if ( checkSignal(plugin, "defineViewModeToolbars(QString,QStringList)"))
      connect(plugin, SIGNAL( defineViewModeToolbars(QString, QStringList) ),
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              coreWidget_, SLOT( slotAddViewModeToolbars(QString, QStringList) ),Qt::DirectConnection );    
              
    if ( checkSignal(plugin, "defineViewModeContextMenus(QString,QStringList)"))
      connect(plugin, SIGNAL( defineViewModeContextMenus(QString, QStringList) ),
              coreWidget_, SLOT( slotAddViewModeContextMenus(QString, QStringList) ),Qt::DirectConnection );                
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    if ( checkSignal(plugin, "defineViewModeIcon(QString,QString)"))
      connect(plugin, SIGNAL( defineViewModeIcon(QString, QString) ),
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              coreWidget_, SLOT( slotSetViewModeIcon(QString, QString) ),Qt::DirectConnection );

    if ( checkSignal(plugin, "setViewMode(QString,bool)"))
      connect(plugin,    SIGNAL( setViewMode(QString, bool) ),
              coreWidget_, SLOT( setViewMode(QString, bool) ),Qt::DirectConnection );
  }
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  //Check if the plugin supports Options-Interface
  OptionsInterface* optionsPlugin = qobject_cast< OptionsInterface * >(plugin);
  if ( optionsPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "Options ";

    QWidget* widget = 0;
    if ( optionsPlugin->initializeOptionsWidget( widget ) ) {
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          info.optionsWidget = widget;
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          if ( checkSlot(plugin,"applyOptions()") )
            connect(coreWidget_ , SIGNAL( applyOptions() ),
                    plugin      , SLOT( applyOptions() ),Qt::DirectConnection);
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    }
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  }
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  //Check if the plugin supports Toolbar-Interface
  ToolbarInterface* toolbarPlugin = qobject_cast< ToolbarInterface * >(plugin);
  if ( toolbarPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "Toolbars ";
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    if ( checkSignal(plugin,"addToolbar(QToolBar*)") )
      connect(plugin,SIGNAL(addToolbar(QToolBar*)),
              coreWidget_,SLOT(slotAddToolbar(QToolBar*)),Qt::DirectConnection);
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    if ( checkSignal(plugin,"removeToolbar(QToolBar*)") )
      connect(plugin,SIGNAL(removeToolbar(QToolBar*)),
              coreWidget_,SLOT(slotRemoveToolbar(QToolBar*)),Qt::DirectConnection);
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    if ( checkSignal(plugin,"getToolBar(QString,QToolBar*&)") )
      connect(plugin,SIGNAL(getToolBar(QString,QToolBar*&)),
              coreWidget_,SLOT(getToolBar(QString,QToolBar*&)),Qt::DirectConnection);
        
  }
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  //Check if the plugin supports StatusBar-Interface
  StatusbarInterface* statusbarPlugin = qobject_cast< StatusbarInterface * >(plugin);
  if ( statusbarPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "StatusBar ";
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