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KDECore

klibloader.cpp

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00001 /* This file is part of the KDE libraries
00002    Copyright (C) 1999 Torben Weis <weis@kde.org>
00003    Copyright (C) 2000 Michael Matz <matz@kde.org>
00004 
00005    This library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public
00007    License version 2 as published by the Free Software Foundation.
00008 
00009    This library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Library General Public License for more details.
00013 
00014    You should have received a copy of the GNU Library General Public License
00015    along with this library; see the file COPYING.LIB.  If not, write to
00016    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017    Boston, MA 02110-1301, USA.
00018 */
00019 #include "klibloader.h"
00020 
00021 #include <QtCore/QFile>
00022 #include <QtCore/QDir>
00023 #include <QtCore/QTimer>
00024 #include <QtCore/QLibrary>
00025 #include <QStack>
00026 #include <QtCore/QCoreApplication>
00027 #include <QtCore/QObjectCleanupHandler>
00028 
00029 #include "kstandarddirs.h"
00030 #include "kcomponentdata.h"
00031 #include "kdebug.h"
00032 #include "klocale.h"
00033 
00034 class KLibLoaderPrivate
00035 {
00036 public:
00037     KLibLoader instance;
00038     QObjectCleanupHandler cleanuphandler;
00039     QString errorString;
00040 };
00041 
00042 K_GLOBAL_STATIC(KLibLoaderPrivate, kLibLoaderPrivate)
00043 
00044 #define KLIBLOADER_PRIVATE KLibLoaderPrivate *const d = kLibLoaderPrivate
00045 
00046 KLibLoader* KLibLoader::self()
00047 {
00048     return &kLibLoaderPrivate->instance;
00049 }
00050 
00051 KLibLoader::KLibLoader()
00052     : QObject(0)
00053 {
00054 }
00055 
00056 KLibLoader::~KLibLoader()
00057 {
00058 }
00059 
00060 extern QString makeLibName( const QString &libname );
00061 
00062 extern QString findLibrary(const QString &name, const KComponentData &cData);
00063 
00064 #ifdef Q_OS_WIN
00065 // removes "lib" prefix, if present
00066 QString fixLibPrefix(const QString& libname)
00067 {
00068     int pos = libname.lastIndexOf( '/' );
00069     if ( pos >= 0 )
00070     {
00071         QString file = libname.mid( pos + 1 );
00072         QString path = libname.left( pos );
00073         if( !file.startsWith( "lib" ) )
00074             return libname;
00075         return path + '/' + file.mid( 3 );
00076     }
00077     if( !libname.startsWith( "lib" ) )
00078         return libname;
00079     return libname.mid( 3 );
00080 }
00081 #endif
00082 
00083 //static
00084 QString KLibLoader::findLibrary(const QString &_name, const KComponentData &cData)
00085 {
00086     return ::findLibrary(_name, cData);
00087 }
00088 
00089 KLibrary* KLibLoader::library( const QString &_name, QLibrary::LoadHints hint )
00090 {
00091     if (_name.isEmpty())
00092         return 0;
00093 
00094     KLibrary *lib = new KLibrary(_name);
00095 
00096     // Klibrary search magic did work?
00097     if (lib->fileName().isEmpty()) {
00098         kLibLoaderPrivate->errorString = i18n("Library \"%1\" not found",_name);
00099         delete lib;
00100         return 0;
00101     }
00102 
00103     lib->setLoadHints(hint);
00104 
00105     lib->load();
00106 
00107     if (!lib->isLoaded()) {
00108         kLibLoaderPrivate->errorString = lib->errorString();
00109         delete lib;
00110         return 0;
00111     }
00112 
00113     kLibLoaderPrivate->cleanuphandler.add(lib);
00114 
00115     return lib;
00116 }
00117 
00118 QString KLibLoader::lastErrorMessage() const
00119 {
00120     return kLibLoaderPrivate->errorString;
00121 }
00122 
00123 void KLibLoader::unloadLibrary( const QString &)
00124 {
00125 }
00126 
00127 KPluginFactory* KLibLoader::factory( const QString &_name, QLibrary::LoadHints hint )
00128 {
00129     KLibrary* lib = library( _name, hint);
00130     if ( !lib )
00131         return 0;
00132 
00133     KPluginFactory* fac = lib->factory();
00134     if ( !fac ) {
00135         kLibLoaderPrivate->errorString = errorString( ErrNoFactory );
00136         return 0;
00137     }
00138 
00139     return fac;
00140 }
00141 
00142 QString KLibLoader::errorString( int componentLoadingError )
00143 {
00144     switch ( componentLoadingError ) {
00145     case ErrNoServiceFound:
00146         return i18n( "No service matching the requirements was found." );
00147     case ErrServiceProvidesNoLibrary:
00148         return i18n( "The service provides no library, the Library key is missing in the .desktop file." );
00149     case ErrNoLibrary:
00150         return kLibLoaderPrivate->instance.lastErrorMessage();
00151     case ErrNoFactory:
00152         return i18n( "The library does not export a factory for creating components." );
00153     case ErrNoComponent:
00154         return i18n( "The factory does not support creating components of the specified type." );
00155     default:
00156         return i18n( "KLibLoader: Unknown error" );
00157     }
00158 }
00159 
00160 #include "klibloader.moc"
00161 // vim: sw=4 sts=4 et

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