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/* This file is part of the Calligra project, made with-in the KDE community
Copyright (C) 2010 KO GmbH <ben.martin@kogmbh.com>
Copyright (C) 2013 Friedrich W. H. Kossebau <kossebau@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.
*/
#include "KoLocationSemanticItemFactory.h"
// lib
#include "KoRdfLocation.h"
// KF5
#include <kdebug.h>
#include <klocalizedstring.h>
KoLocationSemanticItemFactory::KoLocationSemanticItemFactory()
: KoRdfSemanticItemFactoryBase("Location")
{
}
KoLocationSemanticItemFactory::~KoLocationSemanticItemFactory()
{
}
QString KoLocationSemanticItemFactory::className() const
{
return QLatin1String("Location");
}
QString KoLocationSemanticItemFactory::classDisplayName() const
{
return i18nc("displayname of the semantic item type Location", "Location");
}
/**
* The redland library is used for in memory Rdf by Soprano. Unfortunately
* the distinct keyword doesn't always do what it should so a postprocess
* has to be applied in some cases to ensure DISTINCT semantics in the results.
*/
struct SparqlDistinctPostprocess {
explicit SparqlDistinctPostprocess(const QString &bindingForID) {
m_bindingsThatMakeID << bindingForID;
}
bool shouldSkip(const Soprano::QueryResultIterator &it) {
const QString id = uniqueID(it);
const bool ret = m_uniqfilter.contains(id);
m_uniqfilter << id;
return ret;
}
void addBindingToKeySet(const QString &n) {
m_bindingsThatMakeID << n;
}
protected:
QString uniqueID(const Soprano::QueryResultIterator &it) {
QString ret;
foreach (const QString &b, m_bindingsThatMakeID) {
ret += it.binding(b).toString();
}
return ret;
}
private:
QStringList m_bindingsThatMakeID;
QSet<QString> m_uniqfilter;
};
/**
* Because there are at least two different ways of associating digital longitude
* and latitude with triples in Rdf, the locations() method farms off discovering
* these values to this method using specific SPARQL query text.
*/
static void addLocations(QList<hKoRdfSemanticItem> &ret, const KoDocumentRdf *rdf, QSharedPointer<Soprano::Model> m,
bool isGeo84,
const QString &sparqlQuery)
{
Soprano::QueryResultIterator it = m->executeQuery(sparqlQuery,
Soprano::Query::QueryLanguageSparql);
SparqlDistinctPostprocess uniqFilter(QLatin1String("lat"));
uniqFilter.addBindingToKeySet(QLatin1String("long"));
while (it.next()) {
if (uniqFilter.shouldSkip(it)) {
continue;
}
hKoRdfSemanticItem semObj(new KoRdfLocation(0, rdf, it, isGeo84));
ret << semObj;
}
}
void KoLocationSemanticItemFactory::updateSemanticItems(QList<hKoRdfBasicSemanticItem> &semanticItems, const KoDocumentRdf *rdf, QSharedPointer<Soprano::Model> m)
{
QList<hKoRdfSemanticItem> currentKoRdfLocations;
addLocations(currentKoRdfLocations, rdf, m, false,
"prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> \n"
"prefix cal: <http://www.w3.org/2002/12/cal/icaltzd#> \n"
"select distinct ?graph ?geo ?long ?lat ?joiner \n"
"where { \n"
" GRAPH ?graph { \n"
" ?ev cal:geo ?geo . \n"
" ?geo rdf:first ?lat . \n"
" ?geo rdf:rest ?joiner . \n"
" ?joiner rdf:first ?long \n"
" } \n"
"} \n");
addLocations(currentKoRdfLocations, rdf, m, true,
"prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> \n"
"prefix geo84: <http://www.w3.org/2003/01/geo/wgs84_pos#> \n"
"select ?graph ?geo ?long ?lat ?type \n"
"where { \n"
" GRAPH ?graph { \n"
" \n"
" ?geo geo84:lat ?lat . \n"
" ?geo geo84:long ?long \n"
" OPTIONAL { ?geo rdf:type ?type } \n"
" \n"
" } \n"
"} \n");
// add the new, remove the no longer existing between locObjects and currentKoRdfLocations.
// The semantic items have a lifetime of this KoDocumentRDF.
// If we could use smart pointers then we could just return the new list of locations,
// As semantic items have a lifetime of this KoDocumentRDF,
// we don't want to create any more than are needed.
//
// As currentKoRdfLocations contains all the location semitems we have found to be valid,
// we need to transfer any new ones from that list to locObjects and delete what
// remains (which are objects that existed in locObjects before and were rediscovered
// during the query process).
//
// Creating a list of locations each time simplifies the query and discovery process
// at the expense of this little mess to merge the new and old with explicit pointer
// and object lifetime handling
QList<hKoRdfBasicSemanticItem> removeSet;
foreach (hKoRdfBasicSemanticItem oldItem, semanticItems) {
const QString oldItemLs = oldItem->linkingSubject().toString();
bool found = false;
foreach (hKoRdfBasicSemanticItem newItem, currentKoRdfLocations) {
if (oldItemLs == newItem->linkingSubject().toString()) {
found = true;
break;
}
}
if (!found) {
removeSet << oldItem;
}
}
foreach (hKoRdfBasicSemanticItem item, removeSet) {
semanticItems.removeAll(item);
}
foreach (hKoRdfBasicSemanticItem newItem, currentKoRdfLocations) {
const QString newItemLs = newItem->linkingSubject().toString();
bool found = false;
foreach (hKoRdfBasicSemanticItem oldItem, semanticItems) {
if (newItemLs == oldItem->linkingSubject().toString()) {
found = true;
break;
}
}
if (!found) {
semanticItems << newItem;
}
}
}
hKoRdfBasicSemanticItem KoLocationSemanticItemFactory::createSemanticItem(const KoDocumentRdf* rdf, QObject* parent)
{
return hKoRdfBasicSemanticItem(new KoRdfLocation(parent, rdf));
}
bool KoLocationSemanticItemFactory::canCreateSemanticItemFromMimeData(const QMimeData* mimeData) const
{
Q_UNUSED(mimeData);
return false;
}
hKoRdfBasicSemanticItem KoLocationSemanticItemFactory::createSemanticItemFromMimeData(const QMimeData* mimeData, KoCanvasBase* host, const KoDocumentRdf* rdf, QObject* parent) const
{
Q_UNUSED(mimeData);
Q_UNUSED(host);
Q_UNUSED(rdf);
Q_UNUSED(parent);
return hKoRdfSemanticItem(0);
}
bool KoLocationSemanticItemFactory::isBasic() const
{
return false;
}
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