1 files changed, 122 insertions, 0 deletions

diff --git a/common/entitystorage.cpp b/common/entitystorage.cpp
new file mode 100644
index 0000000..f84e9f5
--- /dev/null
+++ b/common/entitystorage.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2014 Christian Mollekopf <chrigi_1@fastmail.fm>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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 General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the
+ *   Free Software Foundation, Inc.,
+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
+ */
+
+#include "entitystorage.h"
+
+static void scan(const QSharedPointer<Akonadi2::Storage> &storage, const QByteArray &key, std::function<bool(const QByteArray &key, const Akonadi2::Entity &entity)> callback)
+{
+    storage->scan(key, [=](void *keyValue, int keySize, void *dataValue, int dataSize) -> bool {
+        //Skip internals
+        if (Akonadi2::Storage::isInternalKey(keyValue, keySize)) {
+            return true;
+        }
+
+        //Extract buffers
+        Akonadi2::EntityBuffer buffer(dataValue, dataSize);
+
+        //FIXME implement buffer.isValid()
+        // const auto resourceBuffer = Akonadi2::EntityBuffer::readBuffer<DummyEvent>(buffer.entity().resource());
+        // const auto localBuffer = Akonadi2::EntityBuffer::readBuffer<Akonadi2::ApplicationDomain::Buffer::Event>(buffer.entity().local());
+        // const auto metadataBuffer = Akonadi2::EntityBuffer::readBuffer<Akonadi2::Metadata>(buffer.entity().metadata());
+
+        // if ((!resourceBuffer && !localBuffer) || !metadataBuffer) {
+        //     qWarning() << "invalid buffer " << QByteArray::fromRawData(static_cast<char*>(keyValue), keySize);
+        //     return true;
+        // }
+        return callback(QByteArray::fromRawData(static_cast<char*>(keyValue), keySize), buffer.entity());
+    },
+    [](const Akonadi2::Storage::Error &error) {
+        qWarning() << "Error during query: " << error.message;
+    });
+}
+
+void EntityStorageBase::readValue(const QSharedPointer<Akonadi2::Storage> &storage, const QByteArray &key, const std::function<void(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &)> &resultCallback)
+{
+    scan(storage, key, [=](const QByteArray &key, const Akonadi2::Entity &entity) {
+        const auto metadataBuffer = Akonadi2::EntityBuffer::readBuffer<Akonadi2::Metadata>(entity.metadata());
+        qint64 revision = metadataBuffer ? metadataBuffer->revision() : -1;
+        //This only works for a 1:1 mapping of resource to domain types.
+        //Not i.e. for tags that are stored as flags in each entity of an imap store.
+        //additional properties that don't have a 1:1 mapping (such as separately stored tags),
+        //could be added to the adaptor
+        auto domainObject = create(key, revision, mDomainTypeAdaptorFactory->createAdaptor(entity));
+        resultCallback(domainObject);
+        return true;
+    });
+}
+
+static ResultSet fullScan(const QSharedPointer<Akonadi2::Storage> &storage)
+{
+    //TODO use a result set with an iterator, to read values on demand
+    QVector<QByteArray> keys;
+    scan(storage, QByteArray(), [=, &keys](const QByteArray &key, const Akonadi2::Entity &) {
+        keys << key;
+        return true;
+    });
+    Trace() << "Full scan found " << keys.size() << " results";
+    return ResultSet(keys);
+}
+
+ResultSet EntityStorageBase::filteredSet(const ResultSet &resultSet, const std::function<bool(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject)> &filter, const QSharedPointer<Akonadi2::Storage> &storage, qint64 baseRevision, qint64 topRevision)
+{
+    auto resultSetPtr = QSharedPointer<ResultSet>::create(resultSet);
+
+    //Read through the source values and return whatever matches the filter
+    std::function<bool(std::function<void(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &)>)> generator = [this, resultSetPtr, storage, filter](std::function<void(const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &)> callback) -> bool {
+        while (resultSetPtr->next()) {
+            readValue(storage, resultSetPtr->id(), [this, filter, callback](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject) {
+                if (filter(domainObject)) {
+                    callback(domainObject);
+                }
+            });
+        }
+        return false;
+    };
+    return ResultSet(generator);
+}
+
+ResultSet EntityStorageBase::getResultSet(const Akonadi2::Query &query, const QSharedPointer<Akonadi2::Storage> &storage, qint64 baseRevision, qint64 topRevision)
+{
+    QSet<QByteArray> appliedFilters;
+    ResultSet resultSet = queryIndexes(query, mResourceInstanceIdentifier, appliedFilters);
+    const auto remainingFilters = query.propertyFilter.keys().toSet() - appliedFilters;
+
+    //We do a full scan if there were no indexes available to create the initial set.
+    if (appliedFilters.isEmpty()) {
+        resultSet = fullScan(storage);
+    }
+
+    auto filter = [remainingFilters, query, baseRevision, topRevision](const Akonadi2::ApplicationDomain::ApplicationDomainType::Ptr &domainObject) -> bool {
+        if (topRevision > 0) {
+            Trace() << "filtering by revision " << domainObject->revision();
+            if (domainObject->revision() < baseRevision || domainObject->revision() > topRevision) {
+                return false;
+            }
+        }
+        for (const auto &filterProperty : remainingFilters) {
+            //TODO implement other comparison operators than equality
+            if (domainObject->getProperty(filterProperty) != query.propertyFilter.value(filterProperty)) {
+                return false;
+            }
+        }
+        return true;
+    };
+
+    return filteredSet(resultSet, filter, storage, baseRevision, topRevision);
+}