bool ImageScanner::resolveImageHistory(qlonglong imageId, const QString& historyXml,
QList<qlonglong>* needTaggingIds)
{
/** Stage 2 of history scanning */
if (historyXml.isNull())
{
return true; // "true" means nothing is left to resolve
}
DImageHistory history = DImageHistory::fromXml(historyXml);
if (history.isNull())
{
return true;
}
ImageHistoryGraph graph;
graph.addScannedHistory(history, imageId);
if (!graph.hasEdges())
{
return true;
}
QPair<QList<qlonglong>, QList<qlonglong> > cloud = graph.relationCloudParallel();
DatabaseAccess().db()->addImageRelations(cloud.first, cloud.second, DatabaseRelation::DerivedFrom);
int needResolvingTag = TagsCache::instance()->getOrCreateInternalTag(InternalTagName::needResolvingHistory());
int needTaggingTag = TagsCache::instance()->getOrCreateInternalTag(InternalTagName::needTaggingHistoryGraph());
// remove the needResolvingHistory tag from all images in graph
DatabaseAccess().db()->removeTagsFromItems(graph.allImageIds(), QList<int>() << needResolvingTag);
// mark a single image from the graph (sufficient for find the full relation cloud)
QList<ImageInfo> roots = graph.rootImages();
if (!roots.isEmpty())
{
DatabaseAccess().db()->addItemTag(roots.first().id(), needTaggingTag);
if (needTaggingIds)
{
*needTaggingIds << roots.first().id();
}
}
return !graph.hasUnresolvedEntries();
}
