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kdbusservicestarter.cpp

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00001 /* This file is part of the KDE libraries
00002    Copyright (C) 2003 David Faure <faure@kde.org>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License version 2 as published by the Free Software Foundation.
00007 
00008    This library is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011    Library General Public License for more details.
00012 
00013    You should have received a copy of the GNU Library General Public License
00014    along with this library; see the file COPYING.LIB.  If not, write to
00015    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00016    Boston, MA 02110-1301, USA.
00017 */
00018 
00019 #include "kdbusservicestarter.h"
00020 #include "kservicetypetrader.h"
00021 #include <kapplication.h>
00022 #include "kservice.h"
00023 #include <kdebug.h>
00024 #include <klocale.h>
00025 #include <ktoolinvocation.h>
00026 #include "QtDBus/QtDBus"
00027 
00028 class KDBusServiceStarterPrivate
00029 {
00030     public:
00031         KDBusServiceStarterPrivate() : q(0) {}
00032         ~KDBusServiceStarterPrivate()
00033         {
00034             delete q;
00035         }
00036         KDBusServiceStarter *q;
00037 };
00038 
00039 K_GLOBAL_STATIC(KDBusServiceStarterPrivate, privateObject)
00040 
00041 KDBusServiceStarter* KDBusServiceStarter::self()
00042 {
00043     if (!privateObject->q) {
00044         new KDBusServiceStarter;
00045         Q_ASSERT(privateObject->q);
00046     }
00047     return privateObject->q;
00048 }
00049 
00050 KDBusServiceStarter::KDBusServiceStarter()
00051 {
00052     // Set the singleton instance - useful when a derived KDBusServiceStarter
00053     // was created (before self() was called)
00054     Q_ASSERT(!privateObject->q);
00055     privateObject->q = this;
00056 }
00057 
00058 KDBusServiceStarter::~KDBusServiceStarter()
00059 {
00060 }
00061 
00062 int KDBusServiceStarter::findServiceFor( const QString& serviceType,
00063                                          const QString& _constraint,
00064                                          QString *error, QString* pDBusService,
00065                                          int flags )
00066 {
00067     // Ask the trader which service is preferred for this servicetype
00068     // We want one that provides a DBus interface
00069     QString constraint = _constraint;
00070     if ( !constraint.isEmpty() )
00071         constraint += " and ";
00072     constraint += "exist [X-DBUS-ServiceName]";
00073     const KService::List offers = KServiceTypeTrader::self()->query(serviceType, constraint);
00074     if ( offers.isEmpty() ) {
00075         if ( error )
00076             *error = i18n("No service implementing %1",  serviceType );
00077         kWarning() << "KDBusServiceStarter: No service implementing " << serviceType;
00078         return -1;
00079     }
00080     KService::Ptr ptr = offers.first();
00081     QString dbusService = ptr->property("X-DBUS-ServiceName").toString();
00082 
00083     if ( !QDBusConnection::sessionBus().interface()->isServiceRegistered( dbusService ) )
00084     {
00085         QString error;
00086         if ( startServiceFor( serviceType, constraint, &error, &dbusService, flags ) != 0 )
00087         {
00088             kDebug() << "Couldn't start service:" << error;
00089             return -2;
00090         }
00091     }
00092     kDebug() << "DBus service is available now, as" << dbusService;
00093     if ( pDBusService )
00094         *pDBusService = dbusService;
00095     return 0;
00096 }
00097 
00098 int KDBusServiceStarter::startServiceFor( const QString& serviceType,
00099                                           const QString& constraint,
00100                                           QString *error, QString* dbusService, int /*flags*/ )
00101 {
00102     const KService::List offers = KServiceTypeTrader::self()->query(serviceType, constraint);
00103     if ( offers.isEmpty() )
00104         return -1;
00105     KService::Ptr ptr = offers.first();
00106     kDebug() << "starting" << ptr->entryPath();
00107     return KToolInvocation::startServiceByDesktopPath( ptr->entryPath(), QStringList(), error, dbusService );
00108 }

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