/*!
Constructs a file handler and registers it with Qt. Once created this
handler's create() function will be called (along with all the other
handlers) for any paths used. The most recently created handler that
recognizes the given path (i.e. that returns a QAbstractFileEngine) is
used for the new path.
\sa create()
*/
QAbstractFileEngineHandler::QAbstractFileEngineHandler()
{
QMutexLocker locker(fileEngineHandlerMutex());
if (!fileEngineHandlers)
fileEngineHandlers = new QList<QAbstractFileEngineHandler *>;
fileEngineHandlers->prepend(this);
}
/*!
Destroys the file handler. This will automatically unregister the handler
from Qt.
*/
QAbstractFileEngineHandler::~QAbstractFileEngineHandler()
{
QWriteLocker locker(fileEngineHandlerMutex());
// Remove this handler from the handler list only if the list is valid.
if (!qt_abstractfileenginehandlerlist_shutDown)
fileEngineHandlers()->removeAll(this);
}
/*!
Destroys the file handler. This will automatically unregister the handler
from Qt.
*/
QAbstractFileEngineHandler::~QAbstractFileEngineHandler()
{
QWriteLocker locker(fileEngineHandlerMutex());
// Remove this handler from the handler list only if the list is valid.
if (!qt_abstractfileenginehandlerlist_shutDown) {
QAbstractFileEngineHandlerList *handlers = fileEngineHandlers();
handlers->removeOne(this);
if (handlers->isEmpty())
qt_file_engine_handlers_in_use = false;
}
}
/*!
Creates and returns a QAbstractFileEngine suitable for processing \a
fileName.
You should not need to call this function; use QFile, QFileInfo or QDir
directly instead.
\sa QAbstractFileEngineHandler
*/
QAbstractFileEngine *QAbstractFileEngine::create(const QString &fileName)
{
QMutexLocker locker(fileEngineHandlerMutex());
if (!fileEngineHandlers)
fileEngineHandlers = new QList<QAbstractFileEngineHandler *>;
// check for registered handlers that can load the file
for (int i = 0; i < fileEngineHandlers->size(); i++) {
if (QAbstractFileEngine *ret = fileEngineHandlers->at(i)->create(fileName))
return ret;
}
// fall back to regular file engine
return new QFSFileEngine(fileName);
}
/*
\internal
Handles calls to custom file engine handlers.
*/
QAbstractFileEngine *qt_custom_file_engine_handler_create(const QString &path)
{
QAbstractFileEngine *engine = 0;
if (qt_file_engine_handlers_in_use) {
QReadLocker locker(fileEngineHandlerMutex());
// check for registered handlers that can load the file
QAbstractFileEngineHandlerList *handlers = fileEngineHandlers();
for (int i = 0; i < handlers->size(); i++) {
if ((engine = handlers->at(i)->create(path)))
break;
}
}
return engine;
}
/*!
Creates and returns a QAbstractFileEngine suitable for processing \a
fileName.
You should not need to call this function; use QFile, QFileInfo or
QDir directly instead.
If you reimplemnt this function, it should only return file
engines that knows how to handle \a fileName; otherwise, it should
return 0.
\sa QAbstractFileEngineHandler
*/
QAbstractFileEngine *QAbstractFileEngine::create(const QString &fileName)
{
{
QReadLocker locker(fileEngineHandlerMutex());
// check for registered handlers that can load the file
for (int i = 0; i < fileEngineHandlers()->size(); i++) {
if (QAbstractFileEngine *ret = fileEngineHandlers()->at(i)->create(fileName))
return ret;
}
}
#ifdef QT_BUILD_CORE_LIB
if (!fileName.startsWith(QLatin1Char('/'))) {
int prefixSeparator = fileName.indexOf(QLatin1Char(':'));
if (prefixSeparator > 1) {
QString prefix = fileName.left(prefixSeparator);
QString fileNameWithoutPrefix = fileName.mid(prefixSeparator + 1).prepend(QLatin1Char('/'));
const QStringList &paths = QDir::searchPaths(prefix);
for (int i = 0; i < paths.count(); i++) {
QString path = paths.at(i);
path.append(fileNameWithoutPrefix);
QAbstractFileEngine *engine = create(path);
if (engine && (engine->fileFlags(QAbstractFileEngine::FlagsMask) & QAbstractFileEngine::ExistsFlag)) {
return engine;
}
delete engine;
}
}
}
#endif
#ifdef QT_NO_FSFILEENGINE
return 0;
#else
// fall back to regular file engine
return new QFSFileEngine(fileName);
#endif
}
/*!
Destroys the file handler. This will automatically unregister the handler
from Qt.
*/
QAbstractFileEngineHandler::~QAbstractFileEngineHandler()
{
QMutexLocker locker(fileEngineHandlerMutex());
fileEngineHandlers->removeAll(this);
}
/*!
Constructs a file handler and registers it with Qt. Once created this
handler's create() function will be called (along with all the other
handlers) for any paths used. The most recently created handler that
recognizes the given path (i.e. that returns a QAbstractFileEngine) is
used for the new path.
\sa create()
*/
QAbstractFileEngineHandler::QAbstractFileEngineHandler()
{
QWriteLocker locker(fileEngineHandlerMutex());
qt_file_engine_handlers_in_use = true;
fileEngineHandlers()->prepend(this);
}
~QAbstractFileEngineHandlerList()
{
QWriteLocker locker(fileEngineHandlerMutex());
qt_abstractfileenginehandlerlist_shutDown = true;
}
/*!
Constructs a file handler and registers it with Qt. Once created this
handler's create() function will be called (along with all the other
handlers) for any paths used. The most recently created handler that
recognizes the given path (i.e. that returns a QAbstractFileEngine) is
used for the new path.
\sa create()
*/
QAbstractFileEngineHandler::QAbstractFileEngineHandler()
{
QWriteLocker locker(fileEngineHandlerMutex());
fileEngineHandlers()->prepend(this);
}
