workspace/libs/solid/control/managerbase.cpp

   1 /*  This file is part of the KDE project
   2     Copyright (C) 2006-2007 Kevin Ottens <ervin@kde.org>
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License version 2 as published by the Free Software Foundation.
   7
   8     This library is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11     Library General Public License for more details.
  12
  13     You should have received a copy of the GNU Library General Public License
  14     along with this library; see the file COPYING.LIB.  If not, write to
  15     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  16     Boston, MA 02110-1301, USA.
  17
  18 */
  19
  20 #include "managerbase_p.h"
  21
  22 #include <kservicetypetrader.h>
  23 #include <kservice.h>
  24 #include <klibloader.h>
  25
  26 #include <klocale.h>
  27 #include <kdebug.h>
  28
  29 static QMap<QString, QObject *> _k_preloadedBackends;
  30
  31 Solid::Control::ManagerBasePrivate::ManagerBasePrivate()
  32     : m_backend(0)
  33 {
  34 }
  35
  36 Solid::Control::ManagerBasePrivate::~ManagerBasePrivate()
  37 {
  38 }
  39
  40 void Solid::Control::ManagerBasePrivate::loadBackend(const QString &description, const char *serviceName,
  41                                             const char *backendClassName)
  42 {
  43     if (_k_preloadedBackends.contains(backendClassName)) {
  44         m_backend = _k_preloadedBackends[backendClassName];
  45         return;
  46     }
  47
  48     QStringList error_msg;
  49
  50     KService::List offers = KServiceTypeTrader::self()->query(serviceName, "(Type == 'Service')");
  51
  52     foreach (const KService::Ptr &ptr, offers)
  53     {
  54         QString error_string;
  55         m_backend = ptr->createInstance<QObject>(0, QVariantList(), &error_string);
  56
  57         if(m_backend!=0) {
  58             if (m_backend->inherits(backendClassName)) {
  59                 kDebug() << "Backend loaded: " << ptr->name();
  60                 break;
  61             } else {
  62                 QString error_string = i18n("Backend loaded but wrong type obtained, expected %1",
  63                                              backendClassName);
  64
  65                 kDebug() << "Error loading '" << ptr->name() << "': " << error_string;
  66                 error_msg.append(error_string);
  67
  68                 delete m_backend;
  69                 m_backend = 0;
  70             }
  71         } else {
  72             kDebug() << "Error loading '" << ptr->name() << "', KService said: " << error_string;
  73             error_msg.append(error_string);
  74         }
  75     }
  76
  77     if (m_backend==0) {
  78         if (offers.size() == 0)
  79         {
  80             m_errorText = i18n("No %1 Backend found", description);
  81         }
  82         else
  83         {
  84             m_errorText = "<qt>";
  85             m_errorText+= i18n("Unable to use any of the %1 Backends", description);
  86             m_errorText+= "<table>";
  87
  88             QString line = "<tr><td><b>%1</b></td><td>%2</td></tr>";
  89
  90             for (int i = 0; i< offers.size(); i++)
  91             {
  92                 m_errorText+= line.arg(offers[i]->name()).arg(error_msg[i]);
  93             }
  94
  95             m_errorText+= "</table></qt>";
  96         }
  97     }
  98 }
  99
 100 QString Solid::Control::ManagerBasePrivate::errorText() const
 101 {
 102     return m_errorText;
 103 }
 104
 105 QObject *Solid::Control::ManagerBasePrivate::managerBackend() const
 106 {
 107     return m_backend;
 108 }
 109
 110 void Solid::Control::ManagerBasePrivate::_k_forcePreloadedBackend(const char *backendClassName, QObject *backend)
 111 {
 112     _k_preloadedBackends[backendClassName] = backend;
 113 }
 114
 115