QFactoryLoader Class Reference

#include <qfactoryloader_p.h>

Inheritance diagram for QFactoryLoader:

[legend]Collaboration diagram for QFactoryLoader:

[legend]List of all members.

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Detailed Description

Definition at line 46 of file qfactoryloader_p.h.

Public Member Functions
	QFactoryLoader (const char *iid, const QStringList &paths=QStringList(), const QString &suffix=QString(), Qt::CaseSensitivity=Qt::CaseSensitive)
	~QFactoryLoader ()
QStringList	keys () const
QObject *	instance (const QString &key) const

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Constructor & Destructor Documentation

QFactoryLoader::QFactoryLoader	(	const char *	iid,
		const QStringList &	paths = QStringList(),
		const QString &	suffix = QString(),
		Qt::CaseSensitivity	= Qt::CaseSensitive
	)

Definition at line 50 of file qfactoryloader.cpp.

References QString::arg(), QList< T >::at(), QDir::cleanPath(), QList< T >::clear(), QList< T >::count(), d, QDir::Files, QLibraryPrivate::findOrCreate(), QString::fromLatin1(), i, instance(), QList< T >::isEmpty(), j, key, QFactoryInterface::keys(), keys(), library, QCoreApplicationPrivate::mainThread(), QObject::moveToThread(), path, qDebug(), qt_debug_component(), QT_VERSION, QLibraryPrivate::qt_version, QList< T >::removeFirst(), QSettings::setValue(), QVariant::toStringList(), QSettings::UserScope, and QSettings::value().

    : QObject(*new QFactoryLoaderPrivate)
{
    moveToThread(QCoreApplicationPrivate::mainThread());
    Q_D(QFactoryLoader);
    d->iid = iid;

    QSettings settings(QSettings::UserScope, QLatin1String("Trolltech"));

    for (int i = 0; i < paths.count(); ++i) {
        QString path = paths.at(i) + suffix;
        if (!QDir(path).exists(QLatin1String(".")))
            continue;
        QStringList plugins = QDir(path).entryList(QDir::Files);
        QLibraryPrivate *library = 0;
        for (int j = 0; j < plugins.count(); ++j) {
            QString fileName = QDir::cleanPath(path + QLatin1Char('/') + plugins.at(j));
            if (qt_debug_component()) {
                qDebug() << "QFactoryLoader::QFactoryLoader() looking at" << fileName;
            }
            library = QLibraryPrivate::findOrCreate(QFileInfo(fileName).canonicalFilePath());
            if (!library->isPlugin()) {
                library->release();
                if (qt_debug_component()) {
                    qDebug() << "         not a plugin";
                }
                continue;
            }
            QString regkey = QString::fromLatin1("Qt Factory Cache %1.%2/%3:/%4")
                             .arg((QT_VERSION & 0xff0000) >> 16)
                             .arg((QT_VERSION & 0xff00) >> 8)
                             .arg(QLatin1String(iid))
                             .arg(fileName);
            QStringList reg, keys;
            reg = settings.value(regkey).toStringList();
            if (reg.count() && library->lastModified == reg[0]) {
                keys = reg;
                keys.removeFirst();
            } else {
                if (!library->loadPlugin()) {
                    if (qt_debug_component()) {
                        qDebug() << "           could not load";
                    }
                    library->release();
                    continue;
                }
                QObject *instance = library->instance();
                if (!instance)
                    // ignore plugins that have a valid signature but cannot be loaded.
                    continue;
                QFactoryInterface *factory = qobject_cast<QFactoryInterface*>(instance);
                if (instance && factory && instance->qt_metacast(iid))
                    keys = factory->keys();
                if (keys.isEmpty())
                    library->unload();
                reg.clear();
                reg << library->lastModified;
                reg += keys;
                settings.setValue(regkey, reg);
            }
            if (qt_debug_component()) {
                qDebug() << "keys" << keys;
            }

            if (keys.isEmpty()) {
                library->release();
                continue;
            }
            d->libraryList += library;
            for (int k = 0; k < keys.count(); ++k) {
                // first come first serve, unless the first
                // library was built with a future Qt version,
                // whereas the new one has a Qt version that fits
                // better
                QString key = keys.at(k);
                if (!cs)
                    key = key.toLower();
                QLibraryPrivate *previous = d->keyMap.value(key);
                if (!previous || (previous->qt_version > QT_VERSION && library->qt_version <= QT_VERSION)) {
                    d->keyMap[key] = library;
                    d->keyList += keys.at(k);
                }
            }
        }
    }
}

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QFactoryLoader::~QFactoryLoader

(

)

Definition at line 139 of file qfactoryloader.cpp.

References d, and i.

{
    Q_D(QFactoryLoader);
    for (int i = 0; i < d->libraryList.count(); ++i)
        d->libraryList.at(i)->release();
}

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Member Function Documentation

QStringList QFactoryLoader::keys

(

)

const

Definition at line 146 of file qfactoryloader.cpp.

References QList< T >::at(), QList< T >::count(), d, i, and QPluginLoader::staticInstances().

Referenced by Q_GLOBAL_STATIC_WITH_ARGS(), and QFactoryLoader().

{
    Q_D(const QFactoryLoader);
    QMutexLocker locker(&d->mutex);
    QStringList keys = d->keyList;
    QObjectList instances = QPluginLoader::staticInstances();
    for (int i = 0; i < instances.count(); ++i)
        if (QFactoryInterface *factory = qobject_cast<QFactoryInterface*>(instances.at(i)))
            if (instances.at(i)->qt_metacast(d->iid))
                    keys += factory->keys();
    return keys;
}

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QObject * QFactoryLoader::instance

(

const QString &

key

)

const

Definition at line 159 of file qfactoryloader.cpp.

References QList< T >::at(), Qt::CaseInsensitive, QList< T >::count(), d, i, key, library, QCoreApplicationPrivate::mainThread(), and QPluginLoader::staticInstances().

Referenced by Q_GLOBAL_STATIC_WITH_ARGS(), and QFactoryLoader().

{
    Q_D(const QFactoryLoader);
    QMutexLocker locker(&d->mutex);
    QObjectList instances = QPluginLoader::staticInstances();
    for (int i = 0; i < instances.count(); ++i)
        if (QFactoryInterface *factory = qobject_cast<QFactoryInterface*>(instances.at(i)))
            if (instances.at(i)->qt_metacast(d->iid) && factory->keys().contains(key, Qt::CaseInsensitive))
                return instances.at(i);

    if (QLibraryPrivate* library = d->keyMap.value(key)) {
        if (library->instance || library->loadPlugin()) {
            if (QObject *obj = library->instance()) {
                if (obj && !obj->parent())
                    obj->moveToThread(QCoreApplicationPrivate::mainThread());
                return obj;
            }
        }
    }
    return 0;
}

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The documentation for this class was generated from the following files:

• src/corelib/plugin/qfactoryloader_p.h
• src/corelib/plugin/qfactoryloader.cpp

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