Inheritance diagram for QDeclarativeXmlQueryEngine:

Signals
void	error (void *, const QString &)

void	queryCompleted (const QDeclarativeXmlQueryResult &)

Signals inherited from QThread
void	finished ()
	This signal is emitted when the thread has finished executing. More...

void	started ()
	This signal is emitted when the thread starts executing. More...

void	terminated ()
	This signal is emitted when the thread is terminated. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Public Functions
void	abort (int id)

int	doQuery (QString query, QString namespaces, QByteArray data, QList< QDeclarativeXmlListModelRole > roleObjects, QStringList keyRoleResultsCache)

void	processJobs ()

	QDeclarativeXmlQueryEngine (QDeclarativeEngine *eng)

	~QDeclarativeXmlQueryEngine ()

Public Functions inherited from QThread
void	exit (int retcode=0)
	Tells the thread's event loop to exit with a return code. More...

bool	isFinished () const
	Returns true if the thread is finished; otherwise returns false. More...

bool	isRunning () const
	Returns true if the thread is running; otherwise returns false. More...

Priority	priority () const
	Returns the priority for a running thread. More...

	QThread (QObject *parent=0)
	Constructs a new QThread to manage a new thread. More...

void	setPriority (Priority priority)
	This function sets the priority for a running thread. More...

void	setStackSize (uint stackSize)
	Sets the maximum stack size for the thread to stackSize. More...

uint	stackSize () const
	Returns the maximum stack size for the thread (if set with setStackSize()); otherwise returns zero. More...

bool	wait (unsigned long time=ULONG_MAX)
	Blocks the thread until either of these conditions is met: More...

	~QThread ()
	Destroys the QThread. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Static Public Functions
static QDeclarativeXmlQueryEngine *	instance (QDeclarativeEngine *engine)

Static Public Functions inherited from QThread
static QThread *	currentThread ()
	Returns a pointer to a QThread which manages the currently executing thread. More...

static Qt::HANDLE	currentThreadId ()
	Returns the thread handle of the currently executing thread. More...

static int	idealThreadCount ()
	Returns the ideal number of threads that can be run on the system. More...

static void	yieldCurrentThread ()
	Yields execution of the current thread to another runnable thread, if any. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Protected Functions
void	run ()
	The starting point for the thread. More...

Protected Functions inherited from QThread
int	exec ()
	Enters the event loop and waits until exit() is called, returning the value that was passed to exit(). More...

	QThread (QThreadPrivate &dd, QObject *parent=0)

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Private Functions
void	addIndexToRangeList (QList< QDeclarativeXmlListRange > *ranges, int index) const

void	doQueryJob (XmlQueryJob job, QDeclarativeXmlQueryResult currentResult)

void	doSubQueryJob (XmlQueryJob job, QDeclarativeXmlQueryResult currentResult)

void	getValuesOfKeyRoles (const XmlQueryJob &currentJob, QStringList values, QXmlQuery query) const

void	processQuery (XmlQueryJob *job)

Properties
QSet< int >	m_cancelledJobs

QDeclarativeEngine *	m_engine

QObject *	m_eventLoopQuitHack

QList< XmlQueryJob >	m_jobs

QMutex	m_mutex

QAtomicInt	m_queryIds

QDeclarativeXmlQueryThreadObject *	m_threadObject

Static Private Attributes
static QHash< QDeclarativeEngine , QDeclarativeXmlQueryEngine >	queryEngines

static QMutex	queryEnginesMutex

Additional Inherited Members
Public Types inherited from QThread
enum	Priority { IdlePriority, LowestPriority, LowPriority, NormalPriority, HighPriority, HighestPriority, TimeCriticalPriority, InheritPriority }
	This enum type indicates how the operating system should schedule newly created threads. More...

Public Slots inherited from QThread
void	quit ()
	Tells the thread's event loop to exit with return code 0 (success). More...

void	start (Priority=InheritPriority)
	Begins execution of the thread by calling run(). More...

void	terminate ()
	Terminates the execution of the thread. More...

Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Static Protected Functions inherited from QThread
static void	msleep (unsigned long)
	Forces the current thread to sleep for msecs milliseconds. More...

static void	setTerminationEnabled (bool enabled=true)
	Enables or disables termination of the current thread based on the enabled parameter. More...

static void	sleep (unsigned long)
	Forces the current thread to sleep for secs seconds. More...

static void	usleep (unsigned long)
	Forces the current thread to sleep for usecs microseconds. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 178 of file qdeclarativexmllistmodel.cpp.

Constructors and Destructors

◆ QDeclarativeXmlQueryEngine()

QDeclarativeXmlQueryEngine::QDeclarativeXmlQueryEngine ( QDeclarativeEngine * eng )

Definition at line 244 of file qdeclarativexmllistmodel.cpp.

Referenced by instance().

 : QThread(eng), m_threadObject(0), m_queryIds(XMLLISTMODEL_CLEAR_ID + 1), m_engine(eng), m_eventLoopQuitHack(0)
 {
     qRegisterMetaType<QDeclarativeXmlQueryResult>("QDeclarativeXmlQueryResult");
 
     m_eventLoopQuitHack = new QObject;
     m_eventLoopQuitHack->moveToThread(this);
     connect(m_eventLoopQuitHack, SIGNAL(destroyed(QObject*)), SLOT(quit()), Qt::DirectConnection);
     start(QThread::IdlePriority);
 }

◆ ~QDeclarativeXmlQueryEngine()

QDeclarativeXmlQueryEngine::~QDeclarativeXmlQueryEngine ( )

Definition at line 255 of file qdeclarativexmllistmodel.cpp.

 {
     queryEnginesMutex.lock();
     queryEngines.remove(m_engine);
     queryEnginesMutex.unlock();
 
     m_eventLoopQuitHack->deleteLater();
     wait();
 }

Functions

◆ abort()

void QDeclarativeXmlQueryEngine::abort ( int id )

Definition at line 301 of file qdeclarativexmllistmodel.cpp.

Referenced by QDeclarativeXmlListModel::reload().

 {
     QMutexLocker ml(&m_mutex);
     if (id != -1)
         m_cancelledJobs.insert(id);
 }

◆ addIndexToRangeList()

void QDeclarativeXmlQueryEngine::addIndexToRangeList	(	QList< QDeclarativeXmlListRange > *	ranges,
		int	index
	)		const

private

Definition at line 432 of file qdeclarativexmllistmodel.cpp.

Referenced by doSubQueryJob().

                                                                                                              {
     if (ranges->isEmpty())
         ranges->append(qMakePair(index, 1));
     else if (ranges->last().first + ranges->last().second == index)
         ranges->last().second += 1;
     else
         ranges->append(qMakePair(index, 1));
 }

◆ doQuery()

int QDeclarativeXmlQueryEngine::doQuery	(	QString	query,
		QString	namespaces,
		QByteArray	data,
		QList< QDeclarativeXmlListModelRole >	roleObjects,
		QStringList	keyRoleResultsCache
	)

Definition at line 265 of file qdeclarativexmllistmodel.cpp.

Referenced by QDeclarativeXmlListModel::reload(), and QDeclarativeXmlListModel::requestFinished().

                                                                                                                                                                                {
     {
         QMutexLocker m1(&m_mutex);
         m_queryIds.ref();
         if (m_queryIds <= 0)
             m_queryIds = 1;
     }
 
     XmlQueryJob job;
     job.queryId = m_queryIds;
     job.data = data;
     job.query = QLatin1String("doc($src)") + query;
     job.namespaces = namespaces;
     job.keyRoleResultsCache = keyRoleResultsCache;
 
     for (int i=0; i<roleObjects->count(); i++) {
         if (!roleObjects->at(i)->isValid()) {
             job.roleQueries << QString();
             continue;
         }
         job.roleQueries << roleObjects->at(i)->query();
         job.roleQueryErrorId << static_cast<void*>(roleObjects->at(i));
         if (roleObjects->at(i)->isKey())
             job.keyRoleQueries << job.roleQueries.last();
     }
 
     {
         QMutexLocker ml(&m_mutex);
         m_jobs.append(job);
         if (m_threadObject)
             m_threadObject->processJobs();
     }
 
     return job.queryId;
 }

◆ doQueryJob()

void QDeclarativeXmlQueryEngine::doQueryJob	(	XmlQueryJob *	job,
		QDeclarativeXmlQueryResult *	currentResult
	)

private

Definition at line 372 of file qdeclarativexmllistmodel.cpp.

Referenced by processQuery().

 {
     Q_ASSERT(currentJob->queryId != -1);
 
     QString r;
     QXmlQuery query;
     QBuffer buffer(&currentJob->data);
     buffer.open(QIODevice::ReadOnly);
     query.bindVariable(QLatin1String("src"), &buffer);
     query.setQuery(currentJob->namespaces + currentJob->query);
     query.evaluateTo(&r);
 
     //always need a single root element
     QByteArray xml = "<dummy:items xmlns:dummy=\"http://qtsotware.com/dummy\">\n" + r.toUtf8() + "</dummy:items>";
     QBuffer b(&xml);
     b.open(QIODevice::ReadOnly);
 
     QString namespaces = QLatin1String("declare namespace dummy=\"http://qtsotware.com/dummy\";\n") + currentJob->namespaces;
     QString prefix = QLatin1String("doc($inputDocument)/dummy:items") +
                      currentJob->query.mid(currentJob->query.lastIndexOf(QLatin1Char('/')));
 
     //figure out how many items we are dealing with
     int count = -1;
     {
         QXmlResultItems result;
         QXmlQuery countquery;
         countquery.bindVariable(QLatin1String("inputDocument"), &b);
         countquery.setQuery(namespaces + QLatin1String("count(") + prefix + QLatin1Char(')'));
         countquery.evaluateTo(&result);
         QXmlItem item(result.next());
         if (item.isAtomicValue())
             count = item.toAtomicValue().toInt();
     }
 
     currentJob->data = xml;
     currentJob->prefix = namespaces + prefix + QLatin1Char('/');
     currentResult->size = (count > 0 ? count : 0);
 }

◆ doSubQueryJob()

void QDeclarativeXmlQueryEngine::doSubQueryJob	(	XmlQueryJob *	job,
		QDeclarativeXmlQueryResult *	currentResult
	)

private

Definition at line 441 of file qdeclarativexmllistmodel.cpp.

Referenced by processQuery().

 {
     Q_ASSERT(currentJob->queryId != -1);
 
     QBuffer b(&currentJob->data);
     b.open(QIODevice::ReadOnly);
 
     QXmlQuery subquery;
     subquery.bindVariable(QLatin1String("inputDocument"), &b);
 
     QStringList keyRoleResults;
     getValuesOfKeyRoles(*currentJob, &keyRoleResults, &subquery);
 
     // See if any values of key roles have been inserted or removed.
 
     if (currentJob->keyRoleResultsCache.isEmpty()) {
         currentResult->inserted << qMakePair(0, currentResult->size);
     } else {
         if (keyRoleResults != currentJob->keyRoleResultsCache) {
             QStringList temp;
             for (int i=0; i<currentJob->keyRoleResultsCache.count(); i++) {
                 if (!keyRoleResults.contains(currentJob->keyRoleResultsCache[i]))
                     addIndexToRangeList(&currentResult->removed, i);
                 else
                     temp << currentJob->keyRoleResultsCache[i];
             }
 
             for (int i=0; i<keyRoleResults.count(); i++) {
                 if (temp.count() == i || keyRoleResults[i] != temp[i]) {
                     temp.insert(i, keyRoleResults[i]);
                     addIndexToRangeList(&currentResult->inserted, i);
                 }
             }
         }
     }
     currentResult->keyRoleResultsCache = keyRoleResults;
 
     // Get the new values for each role.
     //### we might be able to condense even further (query for everything in one go)
     const QStringList &queries = currentJob->roleQueries;
     for (int i = 0; i < queries.size(); ++i) {
         QList<QVariant> resultList;
         if (!queries[i].isEmpty()) {
             subquery.setQuery(currentJob->prefix + QLatin1String("(let $v := string(") + queries[i] + QLatin1String(") return if ($v) then ") + queries[i] + QLatin1String(" else \"\")"));
             if (subquery.isValid()) {
                 QXmlResultItems resultItems;
                 subquery.evaluateTo(&resultItems);
                 QXmlItem item(resultItems.next());
                 while (!item.isNull()) {
                     resultList << item.toAtomicValue(); //### we used to trim strings
                     item = resultItems.next();
                 }
             } else {
                 emit error(currentJob->roleQueryErrorId.at(i), queries[i]);
             }
         }
         //### should warn here if things have gone wrong.
         while (resultList.count() < currentResult->size)
             resultList << QVariant();
         currentResult->data << resultList;
         b.seek(0);
     }
 
     //this method is much slower, but works better for incremental loading
     /*for (int j = 0; j < m_size; ++j) {
         QList<QVariant> resultList;
         for (int i = 0; i < m_roleObjects->size(); ++i) {
             QDeclarativeXmlListModelRole *role = m_roleObjects->at(i);
             subquery.setQuery(m_prefix.arg(j+1) + role->query());
             if (role->isStringList()) {
                 QStringList data;
                 subquery.evaluateTo(&data);
                 resultList << QVariant(data);
                 //qDebug() << data;
             } else {
                 QString s;
                 subquery.evaluateTo(&s);
                 if (role->isCData()) {
                     //un-escape
                     s.replace(QLatin1String("&lt;"), QLatin1String("<"));
                     s.replace(QLatin1String("&gt;"), QLatin1String(">"));
                     s.replace(QLatin1String("&amp;"), QLatin1String("&"));
                 }
                 resultList << s.trimmed();
                 //qDebug() << s;
             }
             b.seek(0);
         }
         m_modelData << resultList;
     }*/
 }

◆ error

void QDeclarativeXmlQueryEngine::error	(	void *	,
		const QString &
	)

signal

Referenced by doSubQueryJob().

◆ getValuesOfKeyRoles()

void QDeclarativeXmlQueryEngine::getValuesOfKeyRoles	(	const XmlQueryJob &	currentJob,
		QStringList *	values,
		QXmlQuery *	query
	)		const

private

Definition at line 411 of file qdeclarativexmllistmodel.cpp.

Referenced by doSubQueryJob().

 {
     const QStringList &keysQueries = currentJob.keyRoleQueries;
     QString keysQuery;
     if (keysQueries.count() == 1)
         keysQuery = currentJob.prefix + keysQueries[0];
     else if (keysQueries.count() > 1)
         keysQuery = currentJob.prefix + QLatin1String("concat(") + keysQueries.join(QLatin1String(",")) + QLatin1String(")");
 
     if (!keysQuery.isEmpty()) {
         query->setQuery(keysQuery);
         QXmlResultItems resultItems;
         query->evaluateTo(&resultItems);
         QXmlItem item(resultItems.next());
         while (!item.isNull()) {
             values->append(item.toAtomicValue().toString());
             item = resultItems.next();
         }
     }
 }

◆ instance()

QDeclarativeXmlQueryEngine * QDeclarativeXmlQueryEngine::instance ( QDeclarativeEngine * engine )

static

Definition at line 342 of file qdeclarativexmllistmodel.cpp.

Referenced by QDeclarativeXmlListModel::classBegin(), QDeclarativeXmlListModel::reload(), and QDeclarativeXmlListModel::requestFinished().

 {
     queryEnginesMutex.lock();
     QDeclarativeXmlQueryEngine *queryEng = queryEngines.value(engine);
     if (!queryEng) {
         queryEng = new QDeclarativeXmlQueryEngine(engine);
         queryEngines.insert(engine, queryEng);
     }
     queryEnginesMutex.unlock();
 
     return queryEng;
 }

◆ processJobs()

void QDeclarativeXmlQueryEngine::processJobs ( )

Definition at line 321 of file qdeclarativexmllistmodel.cpp.

Referenced by QDeclarativeXmlQueryThreadObject::event(), and run().

 {
     QMutexLocker locker(&m_mutex);
 
     while (true) {
         if (m_jobs.isEmpty())
             return;
 
         XmlQueryJob currentJob = m_jobs.takeLast();
         while (m_cancelledJobs.remove(currentJob.queryId)) {
             if (m_jobs.isEmpty())
               return;
             currentJob = m_jobs.takeLast();
         }
 
         locker.unlock();
         processQuery(&currentJob);
         locker.relock();
     }
 }

◆ processQuery()

void QDeclarativeXmlQueryEngine::processQuery ( XmlQueryJob * job )

private

Definition at line 355 of file qdeclarativexmllistmodel.cpp.

Referenced by processJobs().

 {
     QDeclarativeXmlQueryResult result;
     result.queryId = job->queryId;
     doQueryJob(job, &result);
     doSubQueryJob(job, &result);
 
     {
         QMutexLocker ml(&m_mutex);
         if (m_cancelledJobs.contains(job->queryId)) {
             m_cancelledJobs.remove(job->queryId);
         } else {
             emit queryCompleted(result);
         }
     }
 }

◆ queryCompleted

void QDeclarativeXmlQueryEngine::queryCompleted ( const QDeclarativeXmlQueryResult & )

signal

Referenced by processQuery().

◆ run()

void QDeclarativeXmlQueryEngine::run ( void )

protectedvirtual

The starting point for the thread.

After calling start(), the newly created thread calls this function. The default implementation simply calls exec().

You can reimplement this function to facilitate advanced thread management. Returning from this method will end the execution of the thread.

See also: start() wait()

Reimplemented from QThread.

Definition at line 308 of file qdeclarativexmllistmodel.cpp.

 {
     m_mutex.lock();
     m_threadObject = new QDeclarativeXmlQueryThreadObject(this);
     m_mutex.unlock();
 
     processJobs();
     exec();
 
     delete m_threadObject;
     m_threadObject = 0;
 }