File indexing completed on 2024-06-23 05:06:48

 /*
     SPDX-FileCopyrightText: 2007, 2009 Volker Krause <vkrause@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "akonadicore_debug.h"
 #include "collection.h"
 #include "collectioncreatejob.h"
 #include "collectiondeletejob.h"
 #include "collectionfetchjob.h"
 #include "collectionfetchscope.h"
 #include "collectionmodifyjob.h"
 #include "collectionmovejob.h"
 #include "collectionsync_p.h"
 
 #include "cachepolicy.h"
 
 #include <KLocalizedString>
 #include <QHash>
 #include <QList>
 
 #include <functional>
 
 using namespace Akonadi;
 
 static const char CONTENTMIMETYPES[] = "CONTENTMIMETYPES";
 
 static const char ROOTPARENTRID[] = "AKONADI_ROOT_COLLECTION";
 
 class RemoteId
 {
 public:
     explicit RemoteId()
     {
     }
 
     explicit inline RemoteId(const QStringList &ridChain)
         : ridChain(ridChain)
     {
     }
 
     explicit inline RemoteId(const QString &rid)
     {
         ridChain.append(rid);
     }
 
     inline bool isAbsolute() const
     {
         return ridChain.last() == QString::fromLatin1(ROOTPARENTRID);
     }
 
     inline bool isEmpty() const
     {
         return ridChain.isEmpty();
     }
 
     inline bool operator==(const RemoteId &other) const
     {
         return ridChain == other.ridChain;
     }
 
     QStringList ridChain;
 
     static RemoteId rootRid;
 };
 
 RemoteId RemoteId::rootRid = RemoteId(QStringList() << QString::fromLatin1(ROOTPARENTRID));
 
 Q_DECLARE_METATYPE(RemoteId)
 
 size_t qHash(const RemoteId &rid, size_t seed = 0) noexcept
 {
     return qHashRange(rid.ridChain.constBegin(), rid.ridChain.constEnd(), seed);
 }
 
 inline bool operator<(const RemoteId &r1, const RemoteId &r2)
 {
     if (r1.ridChain.length() == r2.ridChain.length()) {
         auto it1 = r1.ridChain.constBegin();
         auto end1 = r1.ridChain.constEnd();
         auto it2 = r2.ridChain.constBegin();
         while (it1 != end1) {
             if ((*it1) == (*it2)) {
                 ++it1;
                 ++it2;
                 continue;
             }
             return (*it1) < (*it2);
         }
     } else {
         return r1.ridChain.length() < r2.ridChain.length();
     }
     return false;
 }
 
 QDebug operator<<(QDebug s, const RemoteId &rid)
 {
     s.nospace() << "RemoteId(" << rid.ridChain << ")";
     return s;
 }
 
 /**
  * @internal
  */
 class Akonadi::CollectionSyncPrivate
 {
 public:
     explicit CollectionSyncPrivate(CollectionSync *parent)
         : q(parent)
         , pendingJobs(0)
         , progress(0)
         , currentTransaction(nullptr)
         , incremental(false)
         , streaming(false)
         , hierarchicalRIDs(false)
         , localListDone(false)
         , deliveryDone(false)
         , akonadiRootCollection(Collection::root())
         , resultEmitted(false)
     {
     }
 
     ~CollectionSyncPrivate()
     {
     }
 
     RemoteId remoteIdForCollection(const Collection &collection) const
     {
         if (collection == Collection::root()) {
             return RemoteId::rootRid;
         }
 
         if (!hierarchicalRIDs) {
             return RemoteId(collection.remoteId());
         }
 
         RemoteId rid;
         Collection parent = collection;
         while (parent.isValid() || !parent.remoteId().isEmpty()) {
             QString prid = parent.remoteId();
             if (prid.isEmpty() && parent.isValid()) {
                 prid = uidRidMap.value(parent.id());
             }
             if (prid.isEmpty()) {
                 break;
             }
             rid.ridChain.append(prid);
             parent = parent.parentCollection();
             if (parent == akonadiRootCollection) {
                 rid.ridChain.append(QString::fromLatin1(ROOTPARENTRID));
                 break;
             }
         }
         return rid;
     }
 
     void addRemoteColection(const Collection &collection, bool removed = false)
     {
         QHash<RemoteId, Collection::List> &map = (removed ? removedRemoteCollections : remoteCollections);
         const Collection parentCollection = collection.parentCollection();
         if (parentCollection.remoteId() == akonadiRootCollection.remoteId() || parentCollection.id() == akonadiRootCollection.id()) {
             Collection c2(collection);
             c2.setParentCollection(akonadiRootCollection);
             map[RemoteId::rootRid].append(c2);
         } else {
             Q_ASSERT(!parentCollection.remoteId().isEmpty());
             map[remoteIdForCollection(parentCollection)].append(collection);
         }
     }
 
     /* Compares collections by remoteId and falls back to name comparison in case
      * local collection does not have remoteId (which can happen in some cases)
      */
     bool matchLocalAndRemoteCollection(const Collection &local, const Collection &remote)
     {
         if (!local.remoteId().isEmpty()) {
             return local.remoteId() == remote.remoteId();
         } else {
             return local.name() == remote.name();
         }
     }
 
     void localCollectionsReceived(const Akonadi::Collection::List &localCols)
     {
         for (const Akonadi::Collection &collection : localCols) {
             const RemoteId parentRid = remoteIdForCollection(collection.parentCollection());
             localCollections[parentRid] += collection;
         }
     }
 
     void processCollections(const RemoteId &parentRid)
     {
         Collection::List remoteChildren = remoteCollections.value(parentRid);
         Collection::List removedChildren = removedRemoteCollections.value(parentRid);
         Collection::List localChildren = localCollections.value(parentRid);
 
         // Iterate over the list of local children of localParent
         for (auto localIter = localChildren.begin(), localEnd = localChildren.end(); localIter != localEnd;) {
             const Collection localCollection = *localIter;
             bool matched = false;
             uidRidMap.insert(localIter->id(), localIter->remoteId());
 
             // Try to map removed remote collections (from incremental sync) to local collections
             for (auto removedIter = removedChildren.begin(), removedEnd = removedChildren.end(); removedIter != removedEnd;) {
                 Collection removedCollection = *removedIter;
 
                 if (matchLocalAndRemoteCollection(localCollection, removedCollection)) {
                     matched = true;
                     if (!localCollection.remoteId().isEmpty()) {
                         localCollectionsToRemove.append(localCollection);
                     }
                     // Remove the matched removed collection from the list so that
                     // we don't have to iterate over it again next time.
                     removedIter = removedChildren.erase(removedIter);
                     removedEnd = removedChildren.end();
                     break;
                 } else {
                     // Keep looking
                     ++removedIter;
                 }
             }
 
             if (matched) {
                 // Remove the matched local collection from the list, because we
                 // have already put it into localCollectionsToRemove
                 localIter = localChildren.erase(localIter);
                 localEnd = localChildren.end();
                 continue;
             }
 
             // Try to find a matching collection in the list of remote children
             for (auto remoteIter = remoteChildren.begin(), remoteEnd = remoteChildren.end(); !matched && remoteIter != remoteEnd;) {
                 Collection remoteCollection = *remoteIter;
 
                 // Yay, we found a match!
                 if (matchLocalAndRemoteCollection(localCollection, remoteCollection)) {
                     matched = true;
 
                     // "Virtual" flag cannot be updated: we need to recreate
                     // the collection from scratch.
                     if (localCollection.isVirtual() != remoteCollection.isVirtual()) {
                         // Mark the local collection and all its children for deletion and re-creation
                         QList<QPair<Collection /*local*/, Collection /*remote*/>> parents = {{localCollection, remoteCollection}};
                         while (!parents.empty()) {
                             auto parent = parents.takeFirst();
                             qCDebug(AKONADICORE_LOG) << "Local collection " << parent.first.name() << " will be recreated";
                             localCollectionsToRemove.push_back(parent.first);
                             remoteCollectionsToCreate.push_back(parent.second);
                             for (auto it = localChildren.begin(), end = localChildren.end(); it != end;) {
                                 if (it->parentCollection() == parent.first) {
                                     Collection remoteParent;
                                     auto remoteIt = std::find_if(
                                         remoteChildren.begin(),
                                         remoteChildren.end(),
                                         std::bind(&CollectionSyncPrivate::matchLocalAndRemoteCollection, this, parent.first, std::placeholders::_1));
                                     if (remoteIt != remoteChildren.end()) {
                                         remoteParent = *remoteIt;
                                         remoteEnd = remoteChildren.erase(remoteIt);
                                     }
                                     parents.push_back({*it, remoteParent});
                                     it = localChildren.erase(it);
                                     localEnd = end = localChildren.end();
                                 } else {
                                     ++it;
                                 }
                             }
                         }
                     } else if (collectionNeedsUpdate(localCollection, remoteCollection)) {
                         // We need to store both local and remote collections, so that
                         // we can copy over attributes to be preserved
                         remoteCollectionsToUpdate.append(qMakePair(localCollection, remoteCollection));
                     } else {
                         // Collections are the same, no need to update anything
                     }
 
                     // Remove the matched remote collection from the list so that
                     // in the end we are left with list of collections that don't
                     // exist locally (i.e. new collections)
                     remoteIter = remoteChildren.erase(remoteIter);
                     remoteEnd = remoteChildren.end();
                     break;
                 } else {
                     // Keep looking
                     ++remoteIter;
                 }
             }
 
             if (matched) {
                 // Remove the matched local collection from the list so that
                 // in the end we are left with list of collections that don't
                 // exist remotely (i.e. removed collections)
                 localIter = localChildren.erase(localIter);
                 localEnd = localChildren.end();
             } else {
                 ++localIter;
             }
         }
 
         if (!removedChildren.isEmpty()) {
             removedRemoteCollections[parentRid] = removedChildren;
         } else {
             removedRemoteCollections.remove(parentRid);
         }
 
         if (!remoteChildren.isEmpty()) {
             remoteCollections[parentRid] = remoteChildren;
         } else {
             remoteCollections.remove(parentRid);
         }
 
         if (!localChildren.isEmpty()) {
             localCollections[parentRid] = localChildren;
         } else {
             localCollections.remove(parentRid);
         }
     }
 
     void processLocalCollections(const RemoteId &parentRid, const Collection &parentCollection)
     {
         const Collection::List originalChildren = localCollections.value(parentRid);
         processCollections(parentRid);
 
         const Collection::List remoteChildren = remoteCollections.take(parentRid);
         const Collection::List localChildren = localCollections.take(parentRid);
 
         // At this point remoteChildren contains collections that don't exist locally yet
         if (!remoteChildren.isEmpty()) {
             for (Collection c : remoteChildren) {
                 c.setParentCollection(parentCollection);
                 remoteCollectionsToCreate.append(c);
             }
         }
         // At this point localChildren contains collections that don't exist remotely anymore
         if (!localChildren.isEmpty() && !incremental) {
             for (const auto &c : localChildren) {
                 if (!c.remoteId().isEmpty()) {
                     localCollectionsToRemove.push_back(c);
                 }
             }
         }
 
         // Recurse into children
         for (const Collection &c : originalChildren) {
             processLocalCollections(remoteIdForCollection(c), c);
         }
     }
 
     void localCollectionFetchResult(KJob *job)
     {
         if (job->error()) {
             return; // handled by the base class
         }
 
         processLocalCollections(RemoteId::rootRid, akonadiRootCollection);
         localListDone = true;
         execute();
     }
 
     bool ignoreAttributeChanges(const Akonadi::Collection &col, const QByteArray &attribute) const
     {
         return (keepLocalChanges.contains(attribute) || col.keepLocalChanges().contains(attribute));
     }
 
     /**
       Checks if the given localCollection and remoteCollection are different
     */
     bool collectionNeedsUpdate(const Collection &localCollection, const Collection &remoteCollection) const
     {
         if (!ignoreAttributeChanges(remoteCollection, CONTENTMIMETYPES)) {
             if (localCollection.contentMimeTypes().size() != remoteCollection.contentMimeTypes().size()) {
                 return true;
             } else {
                 for (qsizetype i = 0, total = remoteCollection.contentMimeTypes().size(); i < total; ++i) {
                     const auto contentMimeTypes = remoteCollection.contentMimeTypes();
                     const QString mimeType = contentMimeTypes.at(i);
                     if (!localCollection.contentMimeTypes().contains(mimeType)) {
                         return true;
                     }
                 }
             }
         }
 
         if (localCollection.parentCollection().remoteId() != remoteCollection.parentCollection().remoteId()) {
             return true;
         }
         if (localCollection.name() != remoteCollection.name()) {
             return true;
         }
         if (localCollection.remoteId() != remoteCollection.remoteId()) {
             return true;
         }
         if (localCollection.remoteRevision() != remoteCollection.remoteRevision()) {
             return true;
         }
         if (!(localCollection.cachePolicy() == remoteCollection.cachePolicy())) {
             return true;
         }
         if (localCollection.enabled() != remoteCollection.enabled()) {
             return true;
         }
 
         // CollectionModifyJob adds the remote attributes to the local collection
         const Akonadi::Attribute::List lstAttr = remoteCollection.attributes();
         for (const Attribute *attr : lstAttr) {
             const Attribute *localAttr = localCollection.attribute(attr->type());
             if (localAttr && ignoreAttributeChanges(remoteCollection, attr->type())) {
                 continue;
             }
             // The attribute must both exist and have equal contents
             if (!localAttr || localAttr->serialized() != attr->serialized()) {
                 return true;
             }
         }
 
         return false;
     }
 
     void createLocalCollections()
     {
         if (remoteCollectionsToCreate.isEmpty()) {
             updateLocalCollections();
             return;
         }
 
         for (auto iter = remoteCollectionsToCreate.begin(), end = remoteCollectionsToCreate.end(); iter != end;) {
             const Collection col = *iter;
             const Collection parentCollection = col.parentCollection();
             // The parent already exists locally
             if (parentCollection == akonadiRootCollection || parentCollection.id() > 0) {
                 ++pendingJobs;
                 auto create = new CollectionCreateJob(col, currentTransaction);
                 QObject::connect(create, &KJob::result, q, [this](KJob *job) {
                     createLocalCollectionResult(job);
                 });
 
                 // Commit transaction after every 100 collections are created,
                 // otherwise it overloads database journal and things get veeery slow
                 if (pendingJobs % 100 == 0) {
                     currentTransaction->commit();
                     createTransaction();
                 }
 
                 iter = remoteCollectionsToCreate.erase(iter);
                 end = remoteCollectionsToCreate.end();
             } else {
                 // Skip the collection, we'll try again once we create all the other
                 // collection we already have a parent for
                 ++iter;
             }
         }
     }
 
     void createLocalCollectionResult(KJob *job)
     {
         --pendingJobs;
         if (job->error()) {
             return; // handled by the base class
         }
 
         q->setProcessedAmount(KJob::Bytes, ++progress);
 
         const Collection newLocal = static_cast<CollectionCreateJob *>(job)->collection();
         uidRidMap.insert(newLocal.id(), newLocal.remoteId());
         const RemoteId newLocalRID = remoteIdForCollection(newLocal);
 
         // See if there are any pending collections that this collection is parent of and
         // update them if so
         for (auto iter = remoteCollectionsToCreate.begin(), end = remoteCollectionsToCreate.end(); iter != end; ++iter) {
             const Collection parentCollection = iter->parentCollection();
             if (parentCollection != akonadiRootCollection && parentCollection.id() <= 0) {
                 const RemoteId remoteRID = remoteIdForCollection(*iter);
                 if (remoteRID.isAbsolute()) {
                     if (newLocalRID == remoteIdForCollection(*iter)) {
                         iter->setParentCollection(newLocal);
                     }
                 } else if (!hierarchicalRIDs) {
                     if (remoteRID.ridChain.startsWith(parentCollection.remoteId())) {
                         iter->setParentCollection(newLocal);
                     }
                 }
             }
         }
 
         // Enqueue all pending remote collections that are children of the just-created
         // collection
         Collection::List collectionsToCreate = remoteCollections.take(newLocalRID);
         if (collectionsToCreate.isEmpty() && !hierarchicalRIDs) {
             collectionsToCreate = remoteCollections.take(RemoteId(newLocal.remoteId()));
         }
         for (Collection col : std::as_const(collectionsToCreate)) {
             col.setParentCollection(newLocal);
             remoteCollectionsToCreate.append(col);
         }
 
         // If there are still any collections to create left, try if we just created
         // a parent for any of them
         if (!remoteCollectionsToCreate.isEmpty()) {
             createLocalCollections();
         } else if (pendingJobs == 0) {
             Q_ASSERT(remoteCollectionsToCreate.isEmpty());
             if (!remoteCollections.isEmpty()) {
                 currentTransaction->rollback();
                 q->setError(CollectionSync::Unknown);
                 q->setErrorText(i18n("Found unresolved orphan collections"));
                 qCWarning(AKONADICORE_LOG) << "found unresolved orphan collection";
                 emitResult();
                 return;
             }
 
             currentTransaction->commit();
             createTransaction();
 
             // Otherwise move to next task: updating existing collections
             updateLocalCollections();
         }
         /*
          * else if (!remoteCollections.isEmpty()) {
             currentTransaction->rollback();
             q->setError(Unknown);
             q->setErrorText(i18n("Incomplete collection tree"));
             emitResult();
             return;
         }
         */
     }
 
     /**
       Performs a local update for the given node pair.
     */
     void updateLocalCollections()
     {
         if (remoteCollectionsToUpdate.isEmpty()) {
             deleteLocalCollections();
             return;
         }
 
         using CollectionPair = QPair<Collection, Collection>;
         for (const CollectionPair &pair : std::as_const(remoteCollectionsToUpdate)) {
             const Collection local = pair.first;
             const Collection remote = pair.second;
             Collection upd(remote);
 
             Q_ASSERT(!upd.remoteId().isEmpty());
             Q_ASSERT(currentTransaction);
             upd.setId(local.id());
             if (ignoreAttributeChanges(remote, CONTENTMIMETYPES)) {
                 upd.setContentMimeTypes(local.contentMimeTypes());
             }
             const auto remoteAttributes = upd.attributes();
             for (Attribute *remoteAttr : remoteAttributes) {
                 if (ignoreAttributeChanges(remote, remoteAttr->type()) && local.hasAttribute(remoteAttr->type())) {
                     // We don't want to overwrite the attribute changes with the defaults provided by the resource.
                     const Attribute *localAttr = local.attribute(remoteAttr->type());
                     upd.removeAttribute(localAttr->type());
                     upd.addAttribute(localAttr->clone());
                 }
             }
 
             // ### HACK to work around the implicit move attempts of CollectionModifyJob
             // which we do explicitly below
             Collection c(upd);
             c.setParentCollection(local.parentCollection());
             ++pendingJobs;
             auto mod = new CollectionModifyJob(c, currentTransaction);
             QObject::connect(mod, &KJob::result, q, [this](KJob *job) {
                 updateLocalCollectionResult(job);
             });
 
             // detecting moves is only possible with global RIDs
             if (!hierarchicalRIDs) {
                 if (remote.parentCollection().isValid() && remote.parentCollection().id() != local.parentCollection().id()) {
                     ++pendingJobs;
                     auto move = new CollectionMoveJob(upd, remote.parentCollection(), currentTransaction);
                     QObject::connect(move, &KJob::result, q, [this](KJob *job) {
                         updateLocalCollectionResult(job);
                     });
                 }
             }
         }
     }
 
     void updateLocalCollectionResult(KJob *job)
     {
         --pendingJobs;
         if (job->error()) {
             return; // handled by the base class
         }
         if (qobject_cast<CollectionModifyJob *>(job)) {
             q->setProcessedAmount(KJob::Bytes, ++progress);
         }
 
         // All updates are done, time to move on to next task: deletion
         if (pendingJobs == 0) {
             currentTransaction->commit();
             createTransaction();
 
             deleteLocalCollections();
         }
     }
 
     void deleteLocalCollections()
     {
         if (localCollectionsToRemove.isEmpty()) {
             done();
             return;
         }
 
         for (const Collection &col : std::as_const(localCollectionsToRemove)) {
             Q_ASSERT(!col.remoteId().isEmpty()); // empty RID -> stuff we haven't even written to the remote side yet
 
             ++pendingJobs;
             Q_ASSERT(currentTransaction);
             auto job = new CollectionDeleteJob(col, currentTransaction);
             QObject::connect(job, &KJob::result, q, [this](KJob *job) {
                 deleteLocalCollectionsResult(job);
             });
 
             // It can happen that the groupware servers report us deleted collections
             // twice, in this case this collection delete job will fail on the second try.
             // To avoid a rollback of the complete transaction we gracefully allow the job
             // to fail :)
             currentTransaction->setIgnoreJobFailure(job);
         }
     }
 
     void deleteLocalCollectionsResult(KJob * /*unused*/)
     {
         --pendingJobs;
         q->setProcessedAmount(KJob::Bytes, ++progress);
 
         if (pendingJobs == 0) {
             currentTransaction->commit();
             currentTransaction = nullptr;
 
             done();
         }
     }
 
     void done()
     {
         if (currentTransaction) {
             // This can trigger a direct call of transactionSequenceResult
             currentTransaction->commit();
             currentTransaction = nullptr;
         }
 
         if (!remoteCollections.isEmpty()) {
             q->setError(CollectionSync::Unknown);
             q->setErrorText(i18n("Found unresolved orphan collections"));
         }
         emitResult();
     }
 
     void emitResult()
     {
         // Prevent double result emission
         Q_ASSERT(!resultEmitted);
         if (!resultEmitted) {
             if (q->hasSubjobs()) {
                 // If there are subjobs, pick one, wait for it to finish, then
                 // try again. This way we make sure we don't emit result() signal
                 // while there is still a Transaction job running
                 KJob *subjob = q->subjobs().at(0);
                 QObject::connect(
                     subjob,
                     &KJob::result,
                     q,
                     [this](KJob * /*unused*/) {
                         emitResult();
                     },
                     Qt::QueuedConnection);
             } else {
                 resultEmitted = true;
                 q->emitResult();
             }
         }
     }
 
     void createTransaction()
     {
         currentTransaction = new TransactionSequence(q);
         currentTransaction->setAutomaticCommittingEnabled(false);
         q->connect(currentTransaction, &TransactionSequence::finished, q, [this](KJob *job) {
             transactionSequenceResult(job);
         });
     }
 
     /** After the transaction has finished report we're done as well. */
     void transactionSequenceResult(KJob *job)
     {
         if (job->error()) {
             return; // handled by the base class
         }
 
         // If this was the last transaction, then finish, otherwise there's
         // a new transaction in the queue already
         if (job == currentTransaction) {
             currentTransaction = nullptr;
         }
     }
 
     /**
       Process what's currently available.
     */
     void execute()
     {
         qCDebug(AKONADICORE_LOG) << "localListDone: " << localListDone << " deliveryDone: " << deliveryDone;
         if (!localListDone && !deliveryDone) {
             return;
         }
 
         if (!localListDone && deliveryDone) {
             Job *parent = (currentTransaction ? static_cast<Job *>(currentTransaction) : static_cast<Job *>(q));
             auto job = new CollectionFetchJob(akonadiRootCollection, CollectionFetchJob::Recursive, parent);
             job->fetchScope().setResource(resourceId);
             job->fetchScope().setListFilter(CollectionFetchScope::NoFilter);
             job->fetchScope().setAncestorRetrieval(CollectionFetchScope::All);
             q->connect(job, &CollectionFetchJob::collectionsReceived, q, [this](const auto &cols) {
                 localCollectionsReceived(cols);
             });
             q->connect(job, &KJob::result, q, [this](KJob *job) {
                 localCollectionFetchResult(job);
             });
             return;
         }
 
         // If a transaction is not started yet, it means we just finished local listing
         if (!currentTransaction) {
             // There's nothing to do after local listing -> we are done!
             if (remoteCollectionsToCreate.isEmpty() && remoteCollectionsToUpdate.isEmpty() && localCollectionsToRemove.isEmpty()) {
                 qCDebug(AKONADICORE_LOG) << "Nothing to do";
                 emitResult();
                 return;
             }
             // Ok, there's some work to do, so create a transaction we can use
             createTransaction();
         }
 
         createLocalCollections();
     }
 
     CollectionSync *const q;
 
     QString resourceId;
 
     int pendingJobs;
     int progress;
 
     TransactionSequence *currentTransaction;
 
     bool incremental;
     bool streaming;
     bool hierarchicalRIDs;
 
     bool localListDone;
     bool deliveryDone;
 
     // List of parts where local changes should not be overwritten
     QSet<QByteArray> keepLocalChanges;
 
     QHash<RemoteId /* parent */, Collection::List /* children */> removedRemoteCollections;
     QHash<RemoteId /* parent */, Collection::List /* children */> remoteCollections;
     QHash<RemoteId /* parent */, Collection::List /* children */> localCollections;
 
     Collection::List localCollectionsToRemove;
     Collection::List remoteCollectionsToCreate;
     QList<QPair<Collection /* local */, Collection /* remote */>> remoteCollectionsToUpdate;
     QHash<Collection::Id, QString> uidRidMap;
 
     // HACK: To workaround Collection copy constructor being very expensive, we
     // store the Collection::root() collection in a variable here for faster
     // access
     Collection akonadiRootCollection;
 
     bool resultEmitted;
 };
 
 CollectionSync::CollectionSync(const QString &resourceId, QObject *parent)
     : Job(parent)
     , d(new CollectionSyncPrivate(this))
 {
     d->resourceId = resourceId;
     setTotalAmount(KJob::Bytes, 0);
 }
 
 CollectionSync::~CollectionSync() = default;
 
 void CollectionSync::setRemoteCollections(const Collection::List &remoteCollections)
 {
     setTotalAmount(KJob::Bytes, totalAmount(KJob::Bytes) + remoteCollections.count());
     for (const Collection &c : remoteCollections) {
         d->addRemoteColection(c);
     }
 
     if (!d->streaming) {
         d->deliveryDone = true;
     }
     d->execute();
 }
 
 void CollectionSync::setRemoteCollections(const Collection::List &changedCollections, const Collection::List &removedCollections)
 {
     setTotalAmount(KJob::Bytes, totalAmount(KJob::Bytes) + changedCollections.count());
     d->incremental = true;
     for (const Collection &c : changedCollections) {
         d->addRemoteColection(c);
     }
     for (const Collection &c : removedCollections) {
         d->addRemoteColection(c, true);
     }
 
     if (!d->streaming) {
         d->deliveryDone = true;
     }
     d->execute();
 }
 
 void CollectionSync::doStart()
 {
 }
 
 void CollectionSync::setStreamingEnabled(bool streaming)
 {
     d->streaming = streaming;
 }
 
 void CollectionSync::retrievalDone()
 {
     d->deliveryDone = true;
     d->execute();
 }
 
 void CollectionSync::setHierarchicalRemoteIds(bool hierarchical)
 {
     d->hierarchicalRIDs = hierarchical;
 }
 
 void CollectionSync::rollback()
 {
     if (d->currentTransaction) {
         d->currentTransaction->rollback();
     } else {
         setError(UserCanceled);
         emitResult();
     }
 }
 
 void CollectionSync::setKeepLocalChanges(const QSet<QByteArray> &parts)
 {
     d->keepLocalChanges = parts;
 }
 
 #include "moc_collectionsync_p.cpp"