170 lines
4.2 KiB
C++
170 lines
4.2 KiB
C++
/*
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* Copyright 2006-2007 Aaron Seigo <aseigo@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "dataenginemanager.h"
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#include <KDebug>
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#include <KServiceTypeTrader>
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namespace Plasma
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{
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class NullEngine : public DataEngine
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{
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public:
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NullEngine(QObject* parent = 0)
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: DataEngine(parent)
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{
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setObjectName(i18n("Null Engine"));
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setValid(false);
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// ref() ourselves to ensure we never get deleted
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ref();
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}
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};
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class DataEngineManager::Private
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{
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public:
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Private()
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: nullEng(0)
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{}
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~Private()
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{
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foreach (Plasma::DataEngine* engine, engines) {
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delete engine;
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}
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engines.clear();
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delete nullEng;
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}
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DataEngine* nullEngine()
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{
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if (!nullEng) {
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nullEng = new NullEngine;
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}
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return nullEng;
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}
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DataEngine::Dict engines;
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DataEngine* nullEng;
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};
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class DataEngineManagerSingleton
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{
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public:
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DataEngineManager self;
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};
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K_GLOBAL_STATIC(DataEngineManagerSingleton, privateDataEngineManagerSelf)
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DataEngineManager* DataEngineManager::self()
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{
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return &privateDataEngineManagerSelf->self;
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}
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DataEngineManager::DataEngineManager()
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: d(new Private())
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{
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}
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DataEngineManager::~DataEngineManager()
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{
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delete d;
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}
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Plasma::DataEngine* DataEngineManager::dataEngine(const QString& name) const
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{
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Plasma::DataEngine::Dict::const_iterator it = d->engines.find(name);
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if (it != d->engines.end()) {
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// ref and return the engine
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//Plasma::DataEngine *engine = *it;
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return *it;
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}
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return d->nullEngine();
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}
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Plasma::DataEngine* DataEngineManager::loadDataEngine(const QString& name)
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{
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Plasma::DataEngine* engine = 0;
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Plasma::DataEngine::Dict::const_iterator it = d->engines.find(name);
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if (it != d->engines.end()) {
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engine = *it;
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engine->ref();
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return engine;
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}
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// load the engine, add it to the engines
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QString constraint = QString("[X-Plasma-EngineName] == '%1'").arg(name);
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KService::List offers = KServiceTypeTrader::self()->query("Plasma/DataEngine",
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constraint);
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QString error;
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if (offers.isEmpty()) {
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kDebug() << "offers are empty for " << name << " with constraint " << constraint;
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} else {
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engine = offers.first()->createInstance<Plasma::DataEngine>(0, QVariantList(), &error);
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}
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if (!engine) {
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kDebug() << "Couldn't load engine \"" << name << "\". Error given: " << error;
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return d->nullEngine();
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}
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engine->ref();
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engine->setObjectName(offers.first()->name());
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engine->setIcon(offers.first()->icon());
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d->engines[name] = engine;
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return engine;
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}
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void DataEngineManager::unloadDataEngine(const QString& name)
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{
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Plasma::DataEngine::Dict::iterator it = d->engines.find(name);
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if (it != d->engines.end()) {
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Plasma::DataEngine* engine = *it;
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engine->deref();
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if (!engine->isUsed()) {
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d->engines.erase(it);
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delete engine;
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}
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}
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}
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QStringList DataEngineManager::knownEngines()
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{
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QStringList engines;
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KService::List offers = KServiceTypeTrader::self()->query("Plasma/DataEngine");
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foreach (KService::Ptr service, offers) {
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engines.append(service->property("X-Plasma-EngineName").toString());
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}
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return engines;
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}
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} // namespace Plasma
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#include "dataenginemanager.moc"
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