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+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2015 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+#ifndef REALM_RESULTS_NOTIFIER_HPP
+#define REALM_RESULTS_NOTIFIER_HPP
+
+#include "collection_notifier.hpp"
+#include "results.hpp"
+
+#include <realm/group_shared.hpp>
+
+namespace realm {
+namespace _impl {
+class ResultsNotifier : public CollectionNotifier {
+public:
+    ResultsNotifier(Results& target);
+
+    void target_results_moved(Results& old_target, Results& new_target);
+
+private:
+    // Target Results to update
+    // Can only be used with lock_target() held
+    Results* m_target_results;
+
+    // The source Query, in handover form iff m_sg is null
+    std::unique_ptr<SharedGroup::Handover<Query>> m_query_handover;
+    std::unique_ptr<Query> m_query;
+
+    DescriptorOrdering::HandoverPatch m_ordering_handover;
+    DescriptorOrdering m_descriptor_ordering;
+    bool m_target_is_in_table_order;
+
+    // The TableView resulting from running the query. Will be detached unless
+    // the query was (re)run since the last time the handover object was created
+    TableView m_tv;
+    std::unique_ptr<SharedGroup::Handover<TableView>> m_tv_handover;
+    std::unique_ptr<SharedGroup::Handover<TableView>> m_tv_to_deliver;
+
+    // The table version from the last time the query was run. Used to avoid
+    // rerunning the query when there's no chance of it changing.
+    uint_fast64_t m_last_seen_version = -1;
+
+    // The rows from the previous run of the query, for calculating diffs
+    std::vector<size_t> m_previous_rows;
+
+    // The changeset calculated during run() and delivered in do_prepare_handover()
+    CollectionChangeBuilder m_changes;
+    TransactionChangeInfo* m_info = nullptr;
+
+    bool need_to_run();
+    void calculate_changes();
+    void deliver(SharedGroup&) override;
+
+    void run() override;
+    void do_prepare_handover(SharedGroup&) override;
+    bool do_add_required_change_info(TransactionChangeInfo& info) override;
+    bool prepare_to_deliver() override;
+
+    void release_data() noexcept override;
+    void do_attach_to(SharedGroup& sg) override;
+    void do_detach_from(SharedGroup& sg) override;
+};
+
+} // namespace _impl
+} // namespace realm
+
+#endif /* REALM_RESULTS_NOTIFIER_HPP */