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	diff --git a/nepomuk/core/resourcedata.cpp b/nepomuk/core/resourcedata.cpp
	index bdf277e12f..db9f9fa0e1 100644
	--- a/nepomuk/core/resourcedata.cpp
	+++ b/nepomuk/core/resourcedata.cpp
	@@ -1,830 +1,812 @@
	/*
	* This file is part of the Nepomuk KDE project.
	* Copyright (C) 2006-2010 Sebastian Trueg <trueg@kde.org>
	* Copyright (C) 2010-2012 Vishesh Handa <handa.vish@gmail.com>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#include "resourcedata.h"
	#include "resourcemanager.h"
	#include "resourcemanager_p.h"
	#include "resource.h"
	#include "tools.h"
	#include "nie.h"
	#include "nfo.h"
	#include "pimo.h"
	#include "nepomukmainmodel.h"
	#include "dbusconnectionpool.h"
	#include "class.h"
	#include "dbustypes.h"

	#include <Soprano/Statement>
	#include <Soprano/StatementIterator>
	#include <Soprano/QueryResultIterator>
	#include <Soprano/Model>
	#include <Soprano/Vocabulary/RDFS>
	#include <Soprano/Vocabulary/RDF>
	#include <Soprano/Vocabulary/Xesam>
	#include <Soprano/Vocabulary/NAO>

	#include <QtCore/QFile>
	#include <QtCore/QDateTime>
	#include <QtCore/QMutexLocker>
	#include <QtDBus/QDBusConnection>
	#include <QtDBus/QDBusInterface>
	#include <QtDBus/QDBusReply>

	#include <kdebug.h>
	#include <kurl.h>
	#include <kcomponentdata.h>

	using namespace Soprano;

	#define MAINMODEL (m_rm->m_manager->mainModel())


	Nepomuk::ResourceData::ResourceData( const QUrl& uri, const QUrl& kickOffUri, const QUrl& type, ResourceManagerPrivate* rm )
	: m_uri(uri),
	m_mainType( type ),
	m_modificationMutex(QMutex::Recursive),
	m_cacheDirty(true),
	m_pimoThing(0),
	m_groundingOccurence(0),
	m_rm(rm)
	{
	if( m_mainType.isEmpty() ) {
	m_mainType = Soprano::Vocabulary::RDFS::Resource();
	}

	m_types << m_mainType;

	if( m_rm->dataCacheFull() )
	m_rm->cleanupCache();

	m_rm->dataCnt.ref();

	if( !uri.isEmpty() ) {
	m_kickoffUris.insert( uri );
	}
	if( !kickOffUri.isEmpty() ) {
	m_kickoffUris.insert( kickOffUri );
	}
	m_rm->addToKickOffList( this, m_kickoffUris );
	}


	Nepomuk::ResourceData::~ResourceData()
	{
	resetAll(true);
	m_rm->dataCnt.deref();
	}


	bool Nepomuk::ResourceData::isFile()
	{
	return( m_uri.scheme() == QLatin1String("file") \|\|
	m_nieUrl.scheme() == QLatin1String("file") \|\|
	(!m_kickoffUris.isEmpty() && (*m_kickoffUris.begin()).scheme() == QLatin1String("file")) \|\|
	constHasType( Soprano::Vocabulary::Xesam::File() ) \|\|
	constHasType( Nepomuk::Vocabulary::NFO::FileDataObject() ) );
	}


	QUrl Nepomuk::ResourceData::uri() const
	{
	return m_uri;
	}


	QUrl Nepomuk::ResourceData::type()
	{
	load();
	return m_mainType;
	}


	QList<QUrl> Nepomuk::ResourceData::allTypes()
	{
	load();
	return m_types;
	}


	void Nepomuk::ResourceData::setTypes( const QList<QUrl>& types )
	{
	store();

	QMutexLocker lock(&m_modificationMutex);

	// reset types
	m_types.clear();
	m_mainType = Soprano::Vocabulary::RDFS::Resource();

	QList<Node> nodes;
	// load types (and set maintype)
	foreach( const QUrl& url, types ) {
	loadType( url );
	nodes << Node( url );
	}

	// update the data store
	setProperty(Soprano::Vocabulary::RDF::type(), Nepomuk::Variant(types) );
	}



	void Nepomuk::ResourceData::resetAll( bool isDelete )
	{
	// remove us from all caches (store() will re-insert us later if necessary)
	m_rm->mutex.lock();
	- if( !m_uri.isEmpty() )
	+ if( !m_uri.isEmpty() ) {
	m_rm->m_initializedData.remove( m_uri );
	+ if( m_rm->m_watcher ) {
	+ m_rm->m_watcher->removeResource(Resource::fromResourceUri(m_uri));
	+ }
	+ }
	Q_FOREACH( const KUrl& uri, m_kickoffUris )
	m_rm->m_uriKickoffData.remove( uri );
	m_rm->mutex.unlock();

	// reset all variables
	m_uri = QUrl();
	m_nieUrl = KUrl();
	m_kickoffUris.clear();
	m_cache.clear();
	m_cacheDirty = false;
	m_types.clear();
	delete m_pimoThing;
	m_pimoThing = 0;
	m_groundingOccurence = 0;

	// when we are being deleted the value of m_mainType is not important
	// anymore. Also since ResourceManager is a global static it might be
	// deleted after the global static behind Soprano::Vocabulary::RDFS
	// which results in a crash.
	if( !isDelete )
	m_mainType = Soprano::Vocabulary::RDFS::Resource();
	}


	QHash<QUrl, Nepomuk::Variant> Nepomuk::ResourceData::allProperties()
	{
	load();
	return m_cache;
	}


	bool Nepomuk::ResourceData::hasProperty( const QUrl& uri )
	{
	load();
	QHash<QUrl, Variant>::const_iterator it = m_cache.constFind( uri );
	if( it == m_cache.constEnd() )
	return false;

	return true;
	}


	bool Nepomuk::ResourceData::hasProperty( const QUrl& p, const Variant& v )
	{
	QHash<QUrl, Variant>::const_iterator it = m_cache.constFind( p );
	if( it == m_cache.constEnd() )
	return false;

	QList<Variant> thisVals = it.value().toVariantList();
	QList<Variant> vals = v.toVariantList();
	Q_FOREACH( const Variant& val, vals ) {
	if( !thisVals.contains(val) )
	return false;
	}
	return true;
	}


	bool Nepomuk::ResourceData::hasType( const QUrl& uri )
	{
	load();
	return constHasType( uri );
	}


	bool Nepomuk::ResourceData::constHasType( const QUrl& uri ) const
	{
	// we need to protect the reading, too. setTypes may be triggered from another thread
	QMutexLocker lock(&m_modificationMutex);

	Types::Class requestedType( uri );
	for ( QList<QUrl>::const_iterator it = m_types.constBegin();
	it != m_types.constEnd(); ++it ) {
	Types::Class availType( *it );
	if ( availType == requestedType \|\|
	availType.isSubClassOf( requestedType ) ) {
	return true;
	}
	}
	return false;
	}


	Nepomuk::Variant Nepomuk::ResourceData::property( const QUrl& uri )
	{
	load();

	// we need to protect the reading, too. load my be triggered from another thread's
	// connection to a Soprano statement signal
	QMutexLocker lock(&m_modificationMutex);

	QHash<QUrl, Variant>::const_iterator it = m_cache.constFind( uri );
	if ( it == m_cache.constEnd() ) {
	return Variant();
	}
	else {
	return *it;
	}
	}


	bool Nepomuk::ResourceData::store()
	{
	QMutexLocker lock(&m_modificationMutex);

	if ( m_uri.isEmpty() ) {
	QMutexLocker rmlock(&m_rm->mutex);

	if ( m_nieUrl.isValid() &&
	m_nieUrl.isLocalFile() &&
	m_mainType == Soprano::Vocabulary::RDFS::Resource() ) {
	m_mainType = Nepomuk::Vocabulary::NFO::FileDataObject();
	m_types << m_mainType;
	}

	QDBusConnection bus = QDBusConnection::sessionBus();
	QDBusMessage msg = QDBusMessage::createMethodCall( QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("/datamanagement"),
	QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("createResource") );
	QString app = KGlobal::mainComponent().componentName();
	QVariantList arguments;

	//FIXME: Maybe we should be setting the 'label' over here.
	arguments << DBus::convertUriList(m_types) << QString() << QString() << app;
	msg.setArguments( arguments );

	QDBusMessage reply = bus.call( msg );
	if( reply.type() == QDBusMessage::ErrorMessage ) {
	//TODO: Set the error somehow
	kWarning() << reply.errorMessage();
	return false;
	}
	else if( reply.type() == QDBusMessage::ReplyMessage ) {
	m_uri = reply.arguments().at(0).toUrl();
	}

	// Add us to the initialized data, i.e. make us "valid"
	m_rm->m_initializedData.insert( m_uri, this );

	// each initialized resource has to be in a kickoff list
	// thus, we make sure that is the case.
	if( m_kickoffUris.isEmpty() ) {
	m_kickoffUris.insert( m_uri );
	m_rm->addToKickOffList( this, m_kickoffUris );
	}

	// store our grounding occurrence in case we are a thing created by the pimoThing() method
	if( m_groundingOccurence ) {
	if( m_groundingOccurence != this )
	m_groundingOccurence->store();
	setProperty(Vocabulary::PIMO::groundingOccurrence(), Variant(m_groundingOccurence->uri()) );
	}

	foreach( const KUrl& url, m_kickoffUris ) {
	if( url.scheme().isEmpty() )
	setProperty( Soprano::Vocabulary::NAO::identifier(), Variant(url.url()) );
	else
	setProperty( Nepomuk::Vocabulary::NIE::url(), Variant(url.url()) );
	}
	}

	return true;
	}


	void Nepomuk::ResourceData::loadType( const QUrl& storedType )
	{
	if ( !m_types.contains( storedType ) ) {
	m_types << storedType;
	}
	if ( m_mainType == Soprano::Vocabulary::RDFS::Resource() ) {
	Q_ASSERT( !storedType.isEmpty() );
	m_mainType = storedType;
	}
	else {
	Types::Class currentTypeClass = m_mainType;
	Types::Class storedTypeClass = storedType;

	// Keep the type that is further down the hierarchy
	if ( storedTypeClass.isSubClassOf( currentTypeClass ) ) {
	m_mainType = storedTypeClass.uri();
	}
	else {
	// This is a little convenience hack since the user is most likely
	// more interested in the file content than the actual file
	Types::Class xesamContentClass( Soprano::Vocabulary::Xesam::Content() );
	if ( m_mainType == Soprano::Vocabulary::Xesam::File() &&
	( storedTypeClass == xesamContentClass \|\|
	storedTypeClass.isSubClassOf( xesamContentClass ) ) ) {
	m_mainType = storedTypeClass.uri();
	}
	else {
	// the same is true for nie:DataObject vs. nie:InformationElement
	Types::Class nieInformationElementClass( Vocabulary::NIE::InformationElement() );
	Types::Class nieDataObjectClass( Vocabulary::NIE::DataObject() );
	if( ( currentTypeClass == nieDataObjectClass \|\|
	currentTypeClass.isSubClassOf( nieDataObjectClass ) ) &&
	( storedTypeClass == nieInformationElementClass \|\|
	storedTypeClass.isSubClassOf( nieInformationElementClass ) ) ) {
	m_mainType = storedTypeClass.uri();
	}
	}
	}
	}
	}


	bool Nepomuk::ResourceData::load()
	{
	QMutexLocker lock(&m_modificationMutex);

	if ( m_cacheDirty ) {
	m_cache.clear();

	if ( m_uri.isValid() ) {
	//
	// We exclude properties that are part of the inference graph
	// It would only pollute the user interface
	//
	Soprano::QueryResultIterator it = MAINMODEL->executeQuery(QString("select distinct ?p ?o where { "
	"graph ?g { %1 ?p ?o . } . FILTER(?g!=<urn:crappyinference2:inferredtriples>) . "
	"}").arg(Soprano::Node::resourceToN3(m_uri)),
	Soprano::Query::QueryLanguageSparql);
	while ( it.next() ) {
	QUrl p = it["p"].uri();
	Soprano::Node o = it["o"];
	if ( p == Soprano::Vocabulary::RDF::type() ) {
	if ( o.isResource() ) {
	loadType( o.uri() );
	}
	}
	else {
	Nepomuk::Variant var = Variant::fromNode( o );
	updateKickOffLists( p, var );
	m_cache[p].append( var );
	}
	}

	m_cacheDirty = false;

	delete m_pimoThing;
	m_pimoThing = 0;
	if( hasType( Vocabulary::PIMO::Thing() ) ) {
	m_pimoThing = new Thing( m_uri );
	}
	else {
	// TODO: somehow handle pimo:referencingOccurrence and pimo:occurrence
	QueryResultIterator pimoIt = MAINMODEL->executeQuery( QString( "select ?r where { ?r <%1> <%2> . }")
	.arg( Vocabulary::PIMO::groundingOccurrence().toString() )
	.arg( QString::fromAscii( m_uri.toEncoded() ) ),
	Soprano::Query::QueryLanguageSparql );
	if( pimoIt.next() ) {
	m_pimoThing = new Thing( pimoIt.binding("r").uri() );
	}
	}

	return true;
	}
	else {
	return false;
	}
	}
	else {
	return true;
	}
	}


	void Nepomuk::ResourceData::setProperty( const QUrl& uri, const Nepomuk::Variant& value )
	{
	Q_ASSERT( uri.isValid() );

	if( store() ) {
	// step 0: make sure this resource is in the store
	QMutexLocker lock(&m_modificationMutex);

	// update the store
	QDBusConnection bus = QDBusConnection::sessionBus();
	QDBusMessage msg = QDBusMessage::createMethodCall( QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("/datamanagement"),
	QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("setProperty") );
	QString app = KGlobal::mainComponent().componentName();
	QVariantList arguments;
	QVariantList varList;
	foreach( const Nepomuk::Variant var, value.toVariantList() ) {
	// make sure resource values are in the store
	if( var.simpleType() == qMetaTypeId<Resource>() ) {
	var.toResource().m_data->store();
	varList << var.toUrl();
	}
	else {
	varList << var.variant();
	}
	}

	arguments << DBus::convertUriList(QList<QUrl>() << m_uri) << DBus::convertUri(uri)
	<< QVariant(DBus::normalizeVariantList(varList)) << app;
	msg.setArguments( arguments );

	QDBusMessage reply = bus.call( msg );
	if( reply.type() == QDBusMessage::ErrorMessage ) {
	//TODO: Set the error somehow
	kWarning() << reply.errorMessage();
	return;
	}

	// update the cache for now
	if( value.isValid() )
	m_cache[uri] = value;
	else
	m_cache.remove(uri);

	// update the kickofflists
	updateKickOffLists( uri, value );
	}
	}


	void Nepomuk::ResourceData::addProperty( const QUrl& uri, const Nepomuk::Variant& value )
	{
	Q_ASSERT( uri.isValid() );

	if( value.isValid() && store() ) {
	// step 0: make sure this resource is in the store
	QMutexLocker lock(&m_modificationMutex);

	// update the store
	QDBusConnection bus = QDBusConnection::sessionBus();
	QDBusMessage msg = QDBusMessage::createMethodCall( QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("/datamanagement"),
	QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("addProperty") );
	QString app = KGlobal::mainComponent().componentName();
	QVariantList arguments;
	QVariantList varList;
	foreach( const Nepomuk::Variant var, value.toVariantList() ) {
	// make sure resource values are in the store
	if( var.simpleType() == qMetaTypeId<Resource>() ) {
	var.toResource().m_data->store();
	varList << var.toUrl();
	}
	else {
	varList << var.variant();
	}
	}

	arguments << DBus::convertUriList(QList<QUrl>() << m_uri) << DBus::convertUri(uri)
	<< QVariant(DBus::normalizeVariantList(varList)) << app;
	msg.setArguments( arguments );

	QDBusMessage reply = bus.call( msg );
	if( reply.type() == QDBusMessage::ErrorMessage ) {
	//TODO: Set the error somehow
	kWarning() << reply.errorMessage();
	return;
	}

	// update the cache for now
	if( value.isValid() )
	m_cache[uri].append(value);

	// update the kickofflists
	updateKickOffLists( uri, value );
	}
	}


	void Nepomuk::ResourceData::removeProperty( const QUrl& uri )
	{
	Q_ASSERT( uri.isValid() );
	if( !m_uri.isEmpty() ) {
	QMutexLocker lock(&m_modificationMutex);

	QDBusConnection bus = QDBusConnection::sessionBus();
	QDBusMessage msg = QDBusMessage::createMethodCall( QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("/datamanagement"),
	QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("removeProperties") );
	QString app = KGlobal::mainComponent().componentName();
	QVariantList arguments;
	arguments << DBus::convertUri(m_uri) << DBus::convertUri(uri) << app;
	msg.setArguments( arguments );

	QDBusMessage reply = bus.call( msg );
	if( reply.type() == QDBusMessage::ErrorMessage ) {
	//TODO: Set the error somehow
	kWarning() << reply.errorMessage();
	return;
	}

	// Update the cache
	m_cache.remove( uri );

	// update the kickofflists
	updateKickOffLists( uri, Variant() );
	}
	}


	void Nepomuk::ResourceData::remove( bool recursive )
	{
	Q_UNUSED(recursive)
	QMutexLocker lock(&m_modificationMutex);

	if( !m_uri.isEmpty() ) {
	QDBusConnection bus = QDBusConnection::sessionBus();
	QDBusMessage msg = QDBusMessage::createMethodCall( QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("/datamanagement"),
	QLatin1String("org.kde.nepomuk.DataManagement"),
	QLatin1String("removeResources") );
	QString app = KGlobal::mainComponent().componentName();
	QVariantList arguments;
	// TODO: Set the flag over here
	arguments << DBus::convertUri(m_uri) << 0 << app;
	msg.setArguments( arguments );

	QDBusMessage reply = bus.call( msg );
	if( reply.type() == QDBusMessage::ErrorMessage ) {
	//TODO: Set the error somehow
	kWarning() << reply.errorMessage();
	return;
	}
	}

	resetAll();
	}


	bool Nepomuk::ResourceData::exists()
	{
	if( m_uri.isValid() ) {
	const QString query = QString::fromLatin1("ask { %1 ?p ?o . }")
	.arg( Soprano::Node::resourceToN3(m_uri) );
	return MAINMODEL->executeQuery( query, Soprano::Query::QueryLanguageSparql ).boolValue();
	}
	else {
	return false;
	}
	}


	bool Nepomuk::ResourceData::isValid() const
	{
	return( !m_mainType.isEmpty() && ( !m_uri.isEmpty() \|\| !m_kickoffUris.isEmpty() ) );
	}


	Nepomuk::ResourceData* Nepomuk::ResourceData::determineUri()
	{
	// We have the following possible situations:
	// 1. m_uri is already valid
	// -> simple, nothing to do
	//
	// 2. m_uri is not valid
	// -> we need to determine the URI
	//
	// 2.1. m_kickoffUri is valid
	// 2.1.1. it is a file URL
	// 2.1.1.1. it is nie:url for r
	// -> use r as m_uri
	// 2.1.1.2. it points to a file on a removable device for which we have a filex:/ URL
	// -> use the r in r nie:url filex:/...
	// 2.1.1.3. it is a file which is not an object in some nie:url relation
	// -> create new random m_uri and use kickoffUriOrId() as m_nieUrl
	// 2.1.2. it is a resource URI
	// -> use it as m_uri
	//
	// 2.2. m_kickOffUri is not valid
	// 2.2.1. m_kickOffUri is a nao:identifier for r
	// -> use r as m_uri
	//

	if( m_uri.isEmpty() ) {
	Soprano::Model* model = MAINMODEL;

	if( !m_kickoffUris.isEmpty() ) {
	KUrl kickOffUri = *m_kickoffUris.begin();
	if( kickOffUri.scheme().isEmpty() ) {
	//
	// Not valid. Checking for nao:identifier
	//
	QString query = QString::fromLatin1("select distinct ?r where { ?r %1 %2. } LIMIT 1")
	.arg( Soprano::Node::resourceToN3(Soprano::Vocabulary::NAO::identifier()) )
	.arg( Soprano::Node::literalToN3( kickOffUri.url() ) );

	Soprano::QueryResultIterator it = model->executeQuery( query, Soprano::Query::QueryLanguageSparql );
	if( it.next() ) {
	m_uri = it["r"].uri();
	it.close();
	}
	}
	else {
	//
	// In one query determine if the URI is already used as resource URI or as
	// nie:url
	//
	QString query = QString::fromLatin1("select distinct ?r ?o where { "
	"{ ?r %1 %2 . FILTER(?r!=%2) . } "
	"UNION "
	"{ %2 ?p ?o . } "
	"} LIMIT 1")
	.arg( Soprano::Node::resourceToN3( Nepomuk::Vocabulary::NIE::url() ) )
	.arg( Soprano::Node::resourceToN3( kickOffUri ) );
	Soprano::QueryResultIterator it = model->executeQuery( query, Soprano::Query::QueryLanguageSparql );
	if( it.next() ) {
	QUrl uri = it["r"].uri();
	if( uri.isEmpty() ) {
	m_uri = kickOffUri;
	}
	else {
	m_uri = uri;
	m_nieUrl = kickOffUri;
	}
	it.close();
	}
	else if( kickOffUri.scheme() == QLatin1String("nepomuk") ) {
	// for nepomuk URIs we simply use the kickoff URI as resource URI
	m_uri = kickOffUri;
	}
	else {
	// for everything else we use m_kickoffUri as nie:url with a new random m_uri
	m_nieUrl = kickOffUri;
	}
	}
	}
	}

	//
	// Move us to the final data hash now that the URI is known
	//
	if( !m_uri.isEmpty() ) {
	//vHanda: Is there some way to avoid this hash lookup every time?
	// It sure would speed things up.
	ResourceDataHash::iterator it = m_rm->m_initializedData.find(m_uri);
	if( it == m_rm->m_initializedData.end() ) {
	m_rm->m_initializedData.insert( m_uri, this );
	- m_watcher = new ResourceWatcher(this);
	- m_watcher->addResource( Nepomuk::Resource::fromResourceUri(m_uri) );
	-
	- connect( m_watcher, SIGNAL(propertyAdded(Nepomuk::Resource,Nepomuk::Types::Property,QVariant)),
	- this, SLOT(propertyAdded(Nepomuk::Resource,Nepomuk::Types::Property,QVariant)) );
	- connect( m_watcher, SIGNAL(propertyRemoved(Nepomuk::Resource,Nepomuk::Types::Property,QVariant)),
	- this, SLOT(propertyRemoved(Nepomuk::Resource,Nepomuk::Types::Property,QVariant)) );
	-
	- m_watcher->start();
	+ if(!m_rm->m_watcher) {
	+ m_rm->m_watcher = new ResourceWatcher(m_rm->m_manager);
	+ QObject::connect( m_watcher, SIGNAL(propertyAdded(Nepomuk::Resource, Nepomuk::Types::Property, QVariant)),
	+ m_rm->m_manager, SLOT(propertyAdded(Nepomuk::Resource, Nepomuk::Types::Property, QVariant)) );
	+ QObject::connect( m_watcher, SIGNAL(propertyRemoved(Nepomuk::Resource, Nepomuk::Types::Property, QVariant)),
	+ m_rm->m_manager, SLOT(propertyRemoved(Nepomuk::Resource, Nepomuk::Types::Property, QVariant)) );
	+ m_rm->m_watcher->start();
	+ }
	+ m_rm->m_watcher->addResource( Nepomuk::Resource::fromResourceUri(m_uri) );
	}
	else {
	return it.value();
	}
	}

	return this;
	}


	void Nepomuk::ResourceData::invalidateCache()
	{
	m_cacheDirty = true;
	}


	Nepomuk::Thing Nepomuk::ResourceData::pimoThing()
	{
	load();
	if( !m_pimoThing ) {
	//
	// We only create a new thing if we are a nie:InformationElement.
	// All other resources will simply be converted into a pimo:Thing
	//
	// Files, however, are a special case in every aspect. this includes pimo things.
	// Files are their own grounding occurrence. This makes a lot of things
	// much simpler.
	//
	if( hasType( Vocabulary::PIMO::Thing() ) \|\|
	isFile() \|\|
	!hasType( Vocabulary::NIE::InformationElement() ) ) {
	m_pimoThing = new Thing(this);
	}
	else {
	m_pimoThing = new Thing();
	}
	m_pimoThing->m_data->m_groundingOccurence = this;
	}
	return *m_pimoThing;
	}


	bool Nepomuk::ResourceData::operator==( const ResourceData& other ) const
	{
	if( this == &other )
	return true;

	return( m_uri == other.m_uri &&
	m_mainType == other.m_mainType &&
	m_kickoffUris == other.m_kickoffUris );
	}


	QDebug Nepomuk::ResourceData::operator<<( QDebug dbg ) const
	{
	KUrl::List list = m_kickoffUris.toList();
	dbg << QString::fromLatin1("[kickoffuri: %1; uri: %2; type: %3; ref: %4]")
	.arg( list.toStringList().join(QLatin1String(",")),
	m_uri.url(),
	m_mainType.toString() )
	.arg( m_ref );

	return dbg;
	}


	QDebug operator<<( QDebug dbg, const Nepomuk::ResourceData& data )
	{
	return data.operator<<( dbg );
	}


	void Nepomuk::ResourceData::updateKickOffLists(const QUrl& prop, const Nepomuk::Variant& v)
	{
	KUrl oldUrl;
	KUrl newUrl;
	if( prop == Nepomuk::Vocabulary::NIE::url() ) {
	oldUrl = m_nieUrl;
	newUrl = v.toUrl();
	m_nieUrl = newUrl;
	}
	else if( prop == Soprano::Vocabulary::NAO::identifier() ) {
	Q_FOREACH( const KUrl& url, m_kickoffUris ) {
	if( url.scheme().isEmpty() ) {
	oldUrl = url;
	break;
	}
	}
	newUrl = KUrl( v.toString() );
	}
	else {
	return;
	}

	if( oldUrl != newUrl ) {
	QMutexLocker rmlock(&m_rm->mutex);

	m_kickoffUris.remove( oldUrl );
	m_rm->m_uriKickoffData.remove( oldUrl );

	if( !newUrl.isEmpty() ) {
	m_kickoffUris.insert( newUrl );
	m_rm->m_uriKickoffData.insert( newUrl, this );
	}
	}
	}
	-
	-void Nepomuk::ResourceData::propertyAdded(const Nepomuk::Resource& res, const Nepomuk::Types::Property& prop, const QVariant& value)
	-{
	- Q_ASSERT( res.resourceUri() == m_uri );
	- const QUrl propUri = prop.uri();
	- const Nepomuk::Variant var(value);
	-
	- m_cache.insert(propUri, var);
	- updateKickOffLists(propUri, var);
	-}
	-
	-void Nepomuk::ResourceData::propertyRemoved(const Nepomuk::Resource& res, const Nepomuk::Types::Property& prop, const QVariant& value)
	-{
	- Q_ASSERT( res.resourceUri() == m_uri );
	- const QUrl propUri = prop.uri();
	- const Nepomuk::Variant var(value);
	-
	- //FIXME: What if the property doesn't have a cardinality of 1?
	- m_cache.remove(propUri);
	-
	- updateKickOffLists(propUri, Variant());
	-}
	diff --git a/nepomuk/core/resourcedata.h b/nepomuk/core/resourcedata.h
	index b2c414593d..bd941e5a0f 100644
	--- a/nepomuk/core/resourcedata.h
	+++ b/nepomuk/core/resourcedata.h
	@@ -1,226 +1,222 @@
	/*
	* This file is part of the Nepomuk KDE project.
	* Copyright (C) 2006-2010 Sebastian Trueg <trueg@kde.org>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifndef _NEPOMUK_RESOURCE_DATA_H_
	#define _NEPOMUK_RESOURCE_DATA_H_

	#include <QtCore/QString>
	#include <QtCore/QList>
	#include <QtCore/QHash>
	#include <QtCore/QMutex>
	#include <QtCore/QAtomicInt>
	#include <QtCore/QSet>

	#include "variant.h"
	#include "thing.h"
	#include "resourcewatcher.h"

	#include <kurl.h>

	#include <soprano/statement.h>


	namespace Nepomuk {

	class Resource;
	class ResourceManagerPrivate;

	- class ResourceData : public QObject
	+ class ResourceData
	{
	- Q_OBJECT
	public:
	explicit ResourceData( const QUrl& uri, const QUrl& kickOffUri, const QUrl& type_, ResourceManagerPrivate* rm );
	~ResourceData();

	inline bool ref(Nepomuk::Resource* res) {
	m_resources.push_back( res );
	return m_ref.ref();
	}


	inline bool deref(Nepomuk::Resource* res) {
	m_resources.removeAll( res );
	return m_ref.deref();
	}

	inline int cnt() const {
	return m_ref;
	}

	/**
	* Tries to determine if this resource represents a file by examining the type and the uri.
	*/
	bool isFile();

	/**
	* The URI of the resource. This might be empty if the resource was not synced yet.
	*/
	QUrl uri() const;

	/**
	* \return The main type of the resource. ResourceData tries hard to make this the
	* most important type, i.e. that which is furthest down the hierachy.
	*/
	QUrl type();

	QList<QUrl> allTypes();

	void setTypes( const QList<QUrl>& types );

	QHash<QUrl, Variant> allProperties();

	bool hasProperty( const QUrl& uri );

	bool hasProperty( const QUrl& p, const Variant& v );

	/**
	* Does also check for subClass relations.
	*/
	bool hasType( const QUrl& uri );

	/**
	* Check the type without loading data from the store.
	*/
	bool constHasType( const QUrl& type ) const;

	Variant property( const QUrl& uri );

	/**
	* Set a property. The property will directly be saved to the RDF store.
	* Calls store to make sure this resource and property resources are properly
	* stored.
	*/
	void setProperty( const QUrl& uri, const Variant& value );

	void addProperty( const QUrl& uri, const Variant& value );

	void removeProperty( const QUrl& uri );

	/**
	* Makes sure the resource is present in the RDF store. This means that if it does
	* not exist the type and the identifier (if one has been used to create the instance)
	* are stored.
	*
	* This is also the only place where a new URI is generated via ResourceManager::generateUniqueUri()
	* in case m_uri is empty.
	*
	* \sa exists, setProperty
	*/
	bool store();

	bool load();

	/**
	* Remove this resource data from the store completely.
	* \param recursive If true all statements that contain this
	* resource as an object will be removed, too.
	*/
	void remove( bool recursive = true );

	/**
	* This method only works with a proper URI, i.e. it does
	* not work on non-initialized resources that only know
	* their kickoffUriOrId
	*/
	bool exists();

	bool isValid() const;

	/**
	* Searches for the resource in the Nepomuk store using m_kickoffId and m_kickoffUri.
	*
	* This will either get the actual resource URI from the database
	* and add m_data into ResourceManagerPrivate::m_initializedData
	* or it will find another ResourceData instance in m_initializedData
	* which represents the same resource. The ResourceData that should be
	* used is returned.
	*
	* \returns The initialized ResourceData object representing the actual resource.
	*
	* m_determineUriMutex needs to be locked before calling this method
	*/
	ResourceData* determineUri();

	void invalidateCache();

	Thing pimoThing();

	/**
	* Compares the properties of two ResourceData objects taking into account the Deleted flag
	*/
	bool operator==( const ResourceData& other ) const;

	QDebug operator<<( QDebug dbg ) const;

	ResourceManagerPrivate* rm() const { return m_rm; }

	/// Contains a list of resources which use this ResourceData
	QList<Resource*> m_resources;

	/// the URI that was used to construct the resource. Will be used by determineUri
	/// to find the actual resource URI which is either m_kickoffUri itself or
	/// a resource URI which relates to m_kickoffUri by nie:url
	/// This is a set since Resource::determineFinalResourceData may add additional uris
	QSet<KUrl> m_kickoffUris;

	+ QHash<QUrl, Variant> m_cache;
	+
	+ /// Updates both m_kickoffUris and ResourceMangerPrivate's list
	+ void updateKickOffLists( const QUrl & prop, const Variant & v );
	+
	private:
	void loadType( const QUrl& type );

	/// Will reset this instance to 0 as if constructed without parameters
	/// Used by remove() and deleteData()
	void resetAll( bool isDelete = false );

	- /// Updates both m_kickoffUris and ResourceMangerPrivate's list
	- void updateKickOffLists( const QUrl & prop, const Variant & v );
	-
	/// final resource URI created by determineUri
	KUrl m_uri;

	/// the URL of file resources
	KUrl m_nieUrl;

	QUrl m_mainType;
	QList<QUrl> m_types;

	QAtomicInt m_ref;

	mutable QMutex m_modificationMutex;

	- QHash<QUrl, Variant> m_cache;
	bool m_cacheDirty;

	// using a pointer to avoid infinite creation loop
	Thing* m_pimoThing;

	// only used for delayed storage of the pimo thing relation
	ResourceData* m_groundingOccurence;

	ResourceManagerPrivate* m_rm;
	ResourceWatcher* m_watcher;
	-
	- private Q_SLOTS:
	- void propertyAdded(const Resource &res, const Types::Property &prop, const QVariant &value);
	- void propertyRemoved(const Resource &res, const Types::Property &prop, const QVariant &value);
	};
	}

	QDebug operator<<( QDebug dbg, const Nepomuk::ResourceData& );

	#endif
	diff --git a/nepomuk/core/resourcemanager.cpp b/nepomuk/core/resourcemanager.cpp
	index 43b543edcf..1e0b5ff1c4 100644
	--- a/nepomuk/core/resourcemanager.cpp
	+++ b/nepomuk/core/resourcemanager.cpp
	@@ -1,546 +1,569 @@
	/*
	* This file is part of the Nepomuk KDE project.
	* Copyright (C) 2006-2012 Sebastian Trueg <trueg@kde.org>
	* Copyright (C) 2010 Vishesh Handa <handa.vish@gmail.com>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#include "resourcemanager.h"
	#include "resourcemanager_p.h"
	#include "resourcedata.h"
	#include "tools.h"
	#include "nepomukmainmodel.h"
	#include "resource.h"
	#include "class.h"
	#include "nie.h"
	#include "dbustypes.h"
	+#include "resourcewatcher.h"

	#include <kglobal.h>
	#include <kdebug.h>
	#include <krandom.h>

	#include <Soprano/Node>
	#include <Soprano/Statement>
	#include <Soprano/Vocabulary/RDF>
	#include <Soprano/StatementIterator>
	#include <Soprano/QueryResultIterator>

	#include <QtCore/QFileInfo>
	#include <QtCore/QMutex>
	#include <QtCore/QMutexLocker>
	#include <QtCore/QUuid>
	#include <QtCore/QMutableHashIterator>
	#include <QtCore/QCoreApplication>
	#include <QtDBus/QDBusConnection>
	#include <QtDBus/QDBusConnectionInterface>
	#include <QtDBus/QDBusServiceWatcher>
	#include <QtDBus/QDBusMetaType>

	using namespace Soprano;

	Nepomuk::ResourceManager* Nepomuk::ResourceManager::s_instance = 0;

	Nepomuk::ResourceManagerPrivate::ResourceManagerPrivate( ResourceManager* manager )
	: mainModel( 0 ),
	overrideModel( 0 ),
	mutex(QMutex::Recursive),
	dataCnt( 0 ),
	- m_manager( manager )
	+ m_manager( manager ),
	+ m_watcher( 0 )
	{
	Nepomuk::DBus::registerDBusTypes();
	}


	Nepomuk::ResourceData* Nepomuk::ResourceManagerPrivate::data( const QUrl& uri, const QUrl& type )
	{
	if ( uri.isEmpty() ) {
	// return an invalid resource which may be activated by calling setProperty
	return new ResourceData( QUrl(), QUrl(), type, this );
	}

	if( ResourceData* data = findData( uri ) ) {
	return data;
	}
	else {
	return new ResourceData( QUrl(), uri, type, this );
	}
	}


	Nepomuk::ResourceData* Nepomuk::ResourceManagerPrivate::data( const QString& uriOrId, const QUrl& type )
	{
	if ( !uriOrId.isEmpty() ) {
	KUrl url(uriOrId);
	return data( url, type );
	}

	return new ResourceData( QUrl(), QUrl(), type, this );
	}


	Nepomuk::ResourceData* Nepomuk::ResourceManagerPrivate::dataForResourceUri( const QUrl& uri, const QUrl& type )
	{
	if ( uri.isEmpty() ) {
	// return an invalid resource which may be activated by calling setProperty
	return new ResourceData( QUrl(), QUrl(), type, this );
	}

	if( ResourceData* data = findData( uri ) ) {
	return data;
	}
	else {
	return new ResourceData( uri, QUrl(), type, this );
	}
	}


	QList<Nepomuk::ResourceData*> Nepomuk::ResourceManagerPrivate::allResourceDataOfType( const QUrl& type )
	{
	QList<ResourceData*> l;

	if( !type.isEmpty() ) {
	mutex.lock();
	QSet<ResourceData*> rdl = m_uriKickoffData.values().toSet();
	mutex.unlock();
	for( QSet<ResourceData*>::iterator rdIt = rdl.begin();
	rdIt != rdl.end(); ++rdIt ) {
	ResourceData* rd = *rdIt;
	//
	// make sure we do not trigger a load here since
	// 1. that could result in the deletion of values from the iterated list (m_cache.clear() in ResourceData::load)
	// 2. We only need to check non-existing resources anyway, since the rest is queried from the db below
	//
	if( rd->constHasType( type ) ) {
	l.append( rd );
	}
	}
	}

	return l;
	}


	QList<Nepomuk::ResourceData*> Nepomuk::ResourceManagerPrivate::allResourceDataWithProperty( const QUrl& uri, const Variant& v )
	{
	QList<ResourceData*> l;

	//
	// We need to cache m_uriKickoffData since it might be changed
	// in the loop by ResourceData::load()
	//
	mutex.lock();
	QSet<ResourceData*> rdl = m_uriKickoffData.values().toSet();
	mutex.unlock();

	//
	// make sure none of the ResourceData objects are deleted by ResourceData::load below
	// which would result in a crash since we have them cached.
	//
	QList<Resource> tmp;
	foreach( ResourceData* rd, rdl ) {
	tmp << Resource( rd );
	}

	for( QSet<ResourceData*>::iterator rdIt = rdl.begin();
	rdIt != rdl.end(); ++rdIt ) {
	ResourceData* rd = *rdIt;
	if( rd->hasProperty( uri ) &&
	rd->property( uri ) == v ) {
	l.append( rd );
	}
	}

	return l;
	}


	QList<Nepomuk::ResourceData*> Nepomuk::ResourceManagerPrivate::allResourceData()
	{
	return m_uriKickoffData.values().toSet().toList();
	}


	bool Nepomuk::ResourceManagerPrivate::dataCacheFull() const
	{
	return dataCnt >= 1000;
	}


	void Nepomuk::ResourceManagerPrivate::cleanupCache( int num )
	{
	QMutexLocker lock( &mutex );

	QSet<ResourceData*> rdl = m_uriKickoffData.values().toSet() + m_initializedData.values().toSet();
	for( QSet<ResourceData*>::iterator rdIt = rdl.begin();
	rdIt != rdl.end(); ++rdIt ) {
	ResourceData* data = *rdIt;
	if ( !data->cnt() ) {
	delete data;
	if( num > 0 && --num == 0 )
	break;
	}
	}
	}


	bool Nepomuk::ResourceManagerPrivate::shouldBeDeleted( ResourceData * rd ) const
	{
	//
	// We delete data objects in one of two cases:
	// 1. They are not valid and as such not in one of the ResourceManagerPrivate kickoff lists
	// 2. The cache is already full and we need to clean up
	//
	return( !rd->cnt() && ( !rd->isValid() \|\| dataCacheFull() ));
	}


	void Nepomuk::ResourceManagerPrivate::addToKickOffList( ResourceData* rd, const QSet<KUrl> & uris )
	{
	Q_FOREACH( const KUrl& uri, uris )
	m_uriKickoffData.insert( uri, rd );
	}


	void Nepomuk::ResourceManagerPrivate::_k_storageServiceInitialized( bool success )
	{
	if( success ) {
	kDebug() << "Nepomuk Storage service up and initialized.";
	cleanupCache(-1);
	m_manager->init();
	emit m_manager->nepomukSystemStarted();
	}
	}


	void Nepomuk::ResourceManagerPrivate::_k_dbusServiceUnregistered( const QString& serviceName )
	{
	if( serviceName == QLatin1String("org.kde.NepomukStorage") ) {
	kDebug() << "Nepomuk Storage service went down.";
	cleanupCache(-1);
	emit m_manager->nepomukSystemStopped();
	}
	}



	Nepomuk::ResourceData* Nepomuk::ResourceManagerPrivate::findData( const QUrl& uri )
	{
	if ( !uri.isEmpty() ) {
	QMutexLocker lock( &mutex );

	// look for the URI in the initialized and in the URI kickoff data
	ResourceDataHash::iterator end = m_initializedData.end();
	ResourceDataHash::iterator it = m_initializedData.find( uri );
	if( it == end ) {
	end = m_uriKickoffData.end();
	it = m_uriKickoffData.find( uri );
	}

	if( it != end ) {
	return it.value();
	}
	}

	return 0;
	}


	Nepomuk::ResourceManager::ResourceManager()
	: QObject(),
	d( new ResourceManagerPrivate( this ) )
	{
	// connect to the storage service's initialized signal to be able to emit
	// the nepomukSystemStarted signal
	QDBusConnection::sessionBus().connect( QLatin1String("org.kde.NepomukStorage"),
	QLatin1String("/servicecontrol"),
	QLatin1String("org.kde.nepomuk.ServiceControl"),
	QLatin1String("serviceInitialized"),
	this,
	SLOT(_k_storageServiceInitialized(bool)) );

	// connect to the serviceUnregistered signal to be able to connect the nepomukSystemStopped
	// signal once the storage service goes away
	QDBusServiceWatcher *watcher = new QDBusServiceWatcher( QLatin1String("org.kde.NepomukStorage"),
	QDBusConnection::sessionBus(),
	QDBusServiceWatcher::WatchForUnregistration,
	this );
	connect( watcher, SIGNAL(serviceUnregistered(QString)),
	this, SLOT(_k_dbusServiceUnregistered(QString)) );

	init();
	}


	Nepomuk::ResourceManager::~ResourceManager()
	{
	clearCache();
	delete d->mainModel;
	delete d;

	if(s_instance == this) {
	s_instance = 0;
	}
	}


	void Nepomuk::ResourceManager::deleteInstance()
	{
	delete this;
	}


	Nepomuk::ResourceManager* Nepomuk::ResourceManager::instance()
	{
	if(!s_instance) {
	s_instance = new ResourceManager();
	s_instance->setParent(QCoreApplication::instance());
	}
	return s_instance;
	}


	int Nepomuk::ResourceManager::init()
	{
	QMutexLocker lock( &d->initMutex );

	if( !d->mainModel ) {
	d->mainModel = new MainModel( this );
	- // FIXME: use the ResourceWatcher instead
	- connect( d->mainModel, SIGNAL(statementsAdded()),
	- this, SLOT(slotStoreChanged()) );
	- connect( d->mainModel, SIGNAL(statementsRemoved()),
	- this, SLOT(slotStoreChanged()) );
	}

	d->mainModel->init();

	return d->mainModel->isValid() ? 0 : -1;
	}


	bool Nepomuk::ResourceManager::initialized() const
	{
	QMutexLocker lock( &d->initMutex );
	return d->mainModel && d->mainModel->isValid();
	}


	#ifndef KDE_NO_DEPRECATED
	Nepomuk::Resource Nepomuk::ResourceManager::createResourceFromUri( const QString& uri )
	{
	return Resource( uri, QUrl() );
	}
	#endif

	void Nepomuk::ResourceManager::removeResource( const QString& uri )
	{
	Resource res( uri );
	res.remove();
	}

	void Nepomuk::ResourceManager::notifyError( const QString& uri, int errorCode )
	{
	kDebug() << "(Nepomuk::ResourceManager) error: " << uri << " " << errorCode;
	emit error( uri, errorCode );
	}


	#ifndef KDE_NO_DEPRECATED
	QList<Nepomuk::Resource> Nepomuk::ResourceManager::allResourcesOfType( const QString& type )
	{
	return allResourcesOfType( QUrl(type) );
	}
	#endif


	QList<Nepomuk::Resource> Nepomuk::ResourceManager::allResourcesOfType( const QUrl& type )
	{
	QSet<Resource> set;

	if( !type.isEmpty() ) {
	// check local data
	QList<ResourceData*> localData = d->allResourceDataOfType( type );
	for( QList<ResourceData*>::iterator rdIt = localData.begin();
	rdIt != localData.end(); ++rdIt ) {
	Resource res( *rdIt );
	set.insert(res);
	}

	// kDebug() << " added local resources: " << l.count();

	Soprano::Model* model = mainModel();
	Soprano::StatementIterator it = model->listStatements( Soprano::Statement( Soprano::Node(), Soprano::Vocabulary::RDF::type(), type ) );

	while( it.next() ) {
	Statement s = *it;
	Resource res( s.subject().uri() );
	set.insert(res);
	}

	// kDebug() << " added remote resources: " << l.count();
	}

	return set.toList();
	}


	QList<Nepomuk::Resource> Nepomuk::ResourceManager::allResources()
	{
	QList<Nepomuk::Resource> l;
	Q_FOREACH( ResourceData* data, d->allResourceData()) {
	l << Resource( data );
	}

	Soprano::QueryResultIterator it = mainModel()->executeQuery( QLatin1String("select distinct ?r where { ?r a ?t . FILTER(?t != rdf:Property && ?t != rdfs:Class) . }"),
	Soprano::Query::QueryLanguageSparql );
	while( it.next() ) {
	Resource r( it[0].uri() );
	l << r;
	}

	return l;
	}


	#ifndef KDE_NO_DEPRECATED
	QList<Nepomuk::Resource> Nepomuk::ResourceManager::allResourcesWithProperty( const QString& uri, const Variant& v )
	{
	return allResourcesWithProperty( QUrl(uri), v );
	}
	#endif


	QList<Nepomuk::Resource> Nepomuk::ResourceManager::allResourcesWithProperty( const QUrl& uri, const Variant& v )
	{
	QSet<Resource> set;

	if( v.isList() ) {
	kDebug() << "(ResourceManager::allResourcesWithProperty) list values not supported.";
	}
	else {
	// check local data
	QList<ResourceData*> localData = d->allResourceDataWithProperty( uri, v );
	for( QList<ResourceData*>::iterator rdIt = localData.begin();
	rdIt != localData.end(); ++rdIt ) {
	set.insert( Resource( *rdIt ) );
	}

	// check remote data
	Soprano::Model* model = mainModel();
	Soprano::StatementIterator it = model->listStatements( Soprano::Statement( Soprano::Node(), uri, v.toNode() ) );

	while( it.next() ) {
	Statement s = *it;
	Resource res( s.subject().uri() );
	set.insert( res );
	}
	}

	return set.toList();
	}


	void Nepomuk::ResourceManager::clearCache()
	{
	d->cleanupCache( -1 );
	}


	#ifndef KDE_NO_DEPRECATED
	QString Nepomuk::ResourceManager::generateUniqueUri()
	{
	return generateUniqueUri( QString() ).toString();
	}
	#endif


	QUrl Nepomuk::ResourceManager::generateUniqueUri( const QString& name )
	{
	// default to res URIs
	QString type = QLatin1String("res");

	// ctx is the only used value for name
	if(name == QLatin1String("ctx")) {
	type = name;
	}

	Soprano::Model* model = mainModel();

	while( 1 ) {
	QString uuid = QUuid::createUuid().toString();
	uuid = uuid.mid(1, uuid.length()-2);
	QUrl uri = QUrl( QLatin1String("nepomuk:/") + type + QLatin1String("/") + uuid );
	if ( !model->executeQuery( QString::fromLatin1("ask where { "
	"{ <%1> ?p1 ?o1 . } "
	"UNION "
	"{ ?s2 <%1> ?o2 . } "
	"UNION "
	"{ ?s3 ?p3 <%1> . } "
	"UNION "
	"{ graph <%1> { ?s4 ?4 ?o4 . } . } "
	"}")
	.arg( QString::fromAscii( uri.toEncoded() ) ), Soprano::Query::QueryLanguageSparql ).boolValue() ) {
	return uri;
	}
	}
	}


	Soprano::Model* Nepomuk::ResourceManager::mainModel()
	{
	// make sure we are initialized
	if ( !d->overrideModel && !initialized() ) {
	init();
	}

	return d->mainModel;
	}


	-void Nepomuk::ResourceManager::slotStoreChanged()
	+void Nepomuk::ResourceManager::slotPropertyAdded(const Resource &res, const Types::Property &prop, const QVariant &value)
	{
	- QMutexLocker lock( &d->mutex );
	-
	- Q_FOREACH( ResourceData* data, d->allResourceData()) {
	- data->invalidateCache();
	+ ResourceDataHash::iterator it = d->m_initializedData.find(res.resourceUri());
	+ if(it != d->m_initializedData.end()) {
	+ ResourceData* data = *it;
	+ data->m_cache[prop.uri()].append(Variant(value));
	+ data->updateKickOffLists(prop.uri(), Variant(value));
	}
	}

	+void Nepomuk::ResourceManager::slotPropertyRemoved(const Resource &res, const Types::Property &prop, const QVariant &value_)
	+{
	+ ResourceDataHash::iterator it = d->m_initializedData.find(res.resourceUri());
	+ if(it != d->m_initializedData.end()) {
	+ ResourceData* data = *it;
	+
	+
	+ QHash<QUrl, Variant>::iterator cacheIt = data->m_cache.find(prop.uri());
	+ if(cacheIt != data->m_cache.end()) {
	+ Variant v = *cacheIt;
	+ const Variant value(value_);
	+ QList<Variant> vl = v.toVariantList();
	+ if(vl.contains(value)) {
	+ vl.removeAll(value);
	+ data->updateKickOffLists(prop.uri(), Variant());
	+ if(vl.isEmpty()) {
	+ data->m_cache.erase(cacheIt);
	+ }
	+ else {
	+ cacheIt.value() = vl;
	+ }
	+ }
	+ }
	+ }
	+}

	void Nepomuk::ResourceManager::setOverrideMainModel( Soprano::Model* model )
	{
	QMutexLocker lock( &d->mutex );

	if( model != d->mainModel ) {
	d->overrideModel = model;

	// clear cache to make sure we do not mix data
	Q_FOREACH( ResourceData* data, d->allResourceData()) {
	data->invalidateCache();
	}
	}
	}


	Nepomuk::ResourceManager* Nepomuk::ResourceManager::createManagerForModel( Soprano::Model* model )
	{
	ResourceManager* manager = new ResourceManager();
	manager->setOverrideMainModel( model );
	return manager;
	}

	#include "resourcemanager.moc"
	diff --git a/nepomuk/core/resourcemanager.h b/nepomuk/core/resourcemanager.h
	index 24565c729a..215dd8a557 100644
	--- a/nepomuk/core/resourcemanager.h
	+++ b/nepomuk/core/resourcemanager.h
	@@ -1,284 +1,289 @@
	/*
	* This file is part of the Nepomuk KDE project.
	* Copyright (C) 2006-2009 Sebastian Trueg <trueg@kde.org>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifndef _NEPOMUK_RESOURCE_MANAGER_H_
	#define _NEPOMUK_RESOURCE_MANAGER_H_

	#include "nepomuk_export.h"

	#include <QtCore/QObject>
	#include <QtCore/QUrl>


	namespace Soprano {
	class Model;
	}

	namespace Nepomuk {
	class Resource;
	class Variant;
	class ResourceManagerHelper;
	class ResourceManagerPrivate;
	+ namespace Types {
	+ class Class;
	+ class Property;
	+ }

	/**
	* \class ResourceManager resourcemanager.h Nepomuk/ResourceManager
	*
	* \brief The ResourceManager is the central \a %Nepomuk configuration point.
	*
	* Use the initialized() method to check the availabity of the %Nepomuk system.
	* Signals nepomukSystemStarted() and nepomukSystemStopped() can be used to
	* enable or disable Nepomuk-specific GUI elements.
	*
	* \author Sebastian Trueg <trueg@kde.org>
	*/
	class NEPOMUK_EXPORT ResourceManager : public QObject
	{
	Q_OBJECT

	public:
	static ResourceManager* instance();

	/**
	* In KDE 4.3 support for multiple ResourceManager instances
	* has been introduced. To keep binary compatibility both the constructor's
	* and destructor's access visibility could not be changed. Thus, instead of deleting
	* a custom ResourceManager instance the standard way, one has to call this
	* method or use QObject::deleteLater.
	*
	* \since 4.3
	*/
	void deleteInstance();

	/**
	* Initialize the Nepomuk framework. This method will initialize the communication with
	* the local Nepomuk-KDE services, ie. the data repository. It will trigger a reconnect
	* to the %Nepomuk database.
	*
	* There is normally no reason to call this method manually except when using multiple
	* threads. In that case it is highly recommended to call this method in the main thread
	* before doing anything else.
	*
	* \return 0 if all necessary components could be found and -1 otherwise.
	*/
	int init();

	/**
	* \return true if init() has been called successfully, ie. the KMetaData system is connected
	* to the local RDF repository service and ready to work.
	*/
	bool initialized() const;

	/**
	* Retrieve the main data storage model.
	*/
	Soprano::Model* mainModel();

	/**
	* Override the main model used for all storage. By default the main model
	* used is the Nepomuk server main model.
	*
	* \param model The model to use instead of the Nepomuk server or 0 to reset.
	*
	* \since 4.1
	*/
	void setOverrideMainModel( Soprano::Model* model );

	/**
	* \deprecated Use the Resource constructor directly.
	*
	* Creates a Resource object representing the data referenced by \a uri.
	* The result is the same as from using the Resource::Resource( const QString&, const QString& )
	* constructor with an empty type.
	*
	* \return The Resource representing the data at \a uri or an invalid Resource object if the local
	* NEPOMUK RDF store does not contain an object with URI \a uri.
	*/
	#ifndef KDE_NO_DEPRECATED
	KDE_DEPRECATED Resource createResourceFromUri( const QString& uri );
	#endif

	/**
	* Remove the resource denoted by \a uri completely.
	*
	* This method is just a wrapper around Resource::remove. The result
	* is the same.
	*/
	void removeResource( const QString& uri );

	/**
	* Retrieve a list of all resource managed by this manager.
	*
	* \warning This list will be very big. Usage of this method is
	* discouraged. Use Query::QueryServiceClient in combination with an
	* empty Query::Query instead.
	*
	* \since 4.3
	*/
	QList<Resource> allResources();

	/**
	* Retrieve a list of all resources of the specified \a type.
	*
	* This includes Resources that are not synced yet so it might
	* not represent exactly the state as in the RDF store.
	*
	* \warning This list can be very big. Usage of this method is
	* discouraged. Use Query::QueryServiceClient in combination with
	* a Query::Query containing one Query::ResourceTypeTerm instead.
	*/
	QList<Resource> allResourcesOfType( const QUrl& type );

	/**
	* \deprecated Use allResourcesOfType( const QString& type )
	*/
	#ifndef KDE_NO_DEPRECATED
	KDE_DEPRECATED QList<Resource> allResourcesOfType( const QString& type );
	#endif

	/**
	* Retrieve a list of all resources that have property \a uri defined with a value of \a v.
	*
	* This includes Resources that are not synced yet so it might
	* not represent exactly the state as in the RDF store.
	*
	* \param uri The URI identifying the property. If this URI does
	* not include a namespace the default namespace is
	* prepended.
	* \param v The value all returned resources should have set as properts \a uri.
	*
	* \warning This list can be very big. Usage of this method is
	* discouraged. Use Query::QueryServiceClient in combination with
	* a Query::Query containing one Query::ComparisonTerm instead.
	*/
	QList<Resource> allResourcesWithProperty( const QUrl& uri, const Variant& v );

	/**
	* \deprecated Use allResourcesWithProperty( const QString& type )
	*/
	#ifndef KDE_NO_DEPRECATED
	KDE_DEPRECATED QList<Resource> allResourcesWithProperty( const QString& uri, const Variant& v );
	#endif

	/**
	* %ResourceManager caches resource locally so subsequent access is faster.
	* This method clears this cache, deleting any Resource that is not used.
	*
	* \since 4.4
	*/
	void clearCache();

	/**
	* \deprecated Use generateUniqueUri(const QString&)
	*
	* Generates a unique URI that is not used in the store yet. This method ca be used to
	* generate URIs for virtual types such as Tag.
	*/
	#ifndef KDE_NO_DEPRECATED
	KDE_DEPRECATED QString generateUniqueUri();
	#endif

	/**
	* Generates a unique URI that is not used in the store yet. This method can be used to
	* generate URIs for virtual types such as Tag.
	*
	* \param label A label that the algorithm should use to try to create a more readable URI.
	*
	* \return A new unique URI which can be used to define a new resource.
	*
	* \since 4.2
	*/
	QUrl generateUniqueUri( const QString& label );

	/**
	* \internal Non-public API. Used by Resource to signalize errors.
	*/
	void notifyError( const QString& uri, int errorCode );

	/**
	* Create a new ResourceManager instance which uses model as its
	* override model. This allows to use multiple instances of ResourceManager
	* at the same time. Normally one does not need this method as the singleton
	* accessed via instance() should be enough.
	*
	* \param model The model to read and write data from and to.
	*
	* \since 4.3
	*/
	static ResourceManager* createManagerForModel( Soprano::Model* model );

	Q_SIGNALS:
	/**
	* This signal gets emitted whenever a Resource changes due to a sync procedure.
	* Be aware that modifying resources locally via the Resource::setProperty method
	* does not result in a resourceModified signal being emitted.
	*
	* \param uri The URI of the modified resource.
	*
	* NOT IMPLEMENTED YET
	*/
	void resourceModified( const QString& uri );

	/**
	* Whenever a problem occurs (like for example failed resource syncing) this
	* signal is emitted.
	*
	* \param uri The resource related to the error.
	* \param errorCode The type of the error (Resource::ErrorCode)
	*/
	void error( const QString& uri, int errorCode );

	/**
	* Emitted once the Nepomuk system is up and can be used.
	*
	* \warning This signal will not be emitted if the Nepomuk
	* system is running when the ResourceManager is created.
	* Use initialized() to check the status.
	*
	* \since 4.4
	*/
	void nepomukSystemStarted();

	/**
	* Emitted once the Nepomuk system goes down.
	*
	* \since 4.4
	*/
	void nepomukSystemStopped();

	private Q_SLOTS:
	- void slotStoreChanged();
	+ void slotPropertyAdded(const Resource &res, const Types::Property &prop, const QVariant &value);
	+ void slotPropertyRemoved(const Resource &res, const Types::Property &prop, const QVariant &value);

	private:
	friend class Nepomuk::Resource;
	friend class Nepomuk::ResourceManagerPrivate;

	ResourceManager();
	~ResourceManager();

	static ResourceManager* s_instance;

	ResourceManagerPrivate* const d;

	Q_PRIVATE_SLOT( d, void _k_storageServiceInitialized(bool) )
	Q_PRIVATE_SLOT( d, void _k_dbusServiceUnregistered(QString) )
	};
	}

	#endif
	diff --git a/nepomuk/core/resourcemanager_p.h b/nepomuk/core/resourcemanager_p.h
	index 128dc5b6d8..3a1d58295e 100644
	--- a/nepomuk/core/resourcemanager_p.h
	+++ b/nepomuk/core/resourcemanager_p.h
	@@ -1,130 +1,133 @@
	/*
	* This file is part of the Nepomuk KDE project.
	* Copyright (C) 2006-2009 Sebastian Trueg <trueg@kde.org>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifndef _NEPOMUK_RESOURCE_MANAGER_P_H_
	#define _NEPOMUK_RESOURCE_MANAGER_P_H_

	#include <QtCore/QMutex>

	#include <kurl.h>

	#include <Soprano/Node> // for qHash(QUrl)

	#include "resourcedata.h"


	namespace Soprano {
	class Model;
	}


	namespace Nepomuk {

	class ResourceManager;
	class MainModel;
	+ class ResourceWatcher;

	typedef QHash<KUrl, Nepomuk::ResourceData*> ResourceDataHash;

	class ResourceManagerPrivate
	{
	public:
	ResourceManagerPrivate( ResourceManager* manager );

	Nepomuk::MainModel* mainModel;
	Soprano::Model* overrideModel;

	/// used to protect the initialization
	QMutex initMutex;

	/// used to protect all data in ResourceManager
	QMutex mutex;

	/// contains all initialized ResourceData object, i.e. all those which
	/// successfully ran determineUri()
	ResourceDataHash m_initializedData;

	/// contains all non-initialized ResourceData objects created in data(QUrl)
	ResourceDataHash m_uriKickoffData;

	QAtomicInt dataCnt;

	ResourceManager* m_manager;

	+ ResourceWatcher* m_watcher;
	+
	/**
	* The Nepomuk lib is based on the fact that for each uri only one ResourceData object is
	* created at all times. This method searches for an existing data object to reuse or creates
	* a new one if none exists.
	*
	* \param uriOrId The URI or identifier of the resource is question.
	* \type The type of the resource.
	*
	* The Resource constructors use this method in combination with ref()
	*/
	ResourceData* data( const QString& uriOrId, const QUrl& type );

	/**
	* The Nepomuk lib is based on the fact that for each uri only one ResourceData object is
	* created at all times. This method searches for an existing data object to reuse or creates
	* a new one if none exists.
	*
	* \param uri The URI of the resource is question or it's nie:url or even its identified stored in
	* a QUrl object.
	* \type The type of the resource.
	*
	* The Resource constructors use this method in combination with ref()
	*/
	ResourceData* data( const QUrl& uri, const QUrl& type );

	/**
	* In contrast to data(QUrl,QUrl) this method avoids the overhead of determining the resource URI
	* via ResourceData::determineUri() and simply uses \p uri as the resource URI.
	*/
	ResourceData* dataForResourceUri( const QUrl& uri, const QUrl& type );

	bool dataCacheFull() const;

	/**
	* Delete unused ResourceData objects from the cache.
	* \param num The number of needed slots. The ResourceData constructor
	* uses this to make room for itself. Use < 0 to free the complete cache.
	*
	* Does NOT lock the mutex.
	*/
	void cleanupCache( int num = 1 );

	bool shouldBeDeleted( ResourceData* rd ) const;

	void addToKickOffList( ResourceData* rd, const QSet<KUrl>& uris );

	QList<ResourceData*> allResourceData();
	QList<ResourceData*> allResourceDataOfType( const QUrl& type );
	QList<ResourceData*> allResourceDataWithProperty( const QUrl& _uri, const Variant& v );

	void _k_storageServiceInitialized( bool );
	void _k_dbusServiceUnregistered( const QString& serviceName );

	private:
	ResourceData* findData( const QUrl& uri );

	QUrl m_mainContext;
	};
	}

	#endif

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