93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
////////////////////////////////////////////////////////////////////////////
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//
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// Copyright 2016 Realm Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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////////////////////////////////////////////////////////////////////////////
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#ifndef REALM_COLLECTION_CHANGE_BUILDER_HPP
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#define REALM_COLLECTION_CHANGE_BUILDER_HPP
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#include "collection_notifications.hpp"
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#include <realm/util/optional.hpp>
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#include <unordered_map>
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namespace realm {
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namespace _impl {
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class CollectionChangeBuilder : public CollectionChangeSet {
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public:
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CollectionChangeBuilder(CollectionChangeBuilder const&) = default;
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CollectionChangeBuilder(CollectionChangeBuilder&&) = default;
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CollectionChangeBuilder& operator=(CollectionChangeBuilder const&) = default;
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CollectionChangeBuilder& operator=(CollectionChangeBuilder&&) = default;
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CollectionChangeBuilder(IndexSet deletions = {},
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IndexSet insertions = {},
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IndexSet modification = {},
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std::vector<Move> moves = {});
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// Calculate where rows need to be inserted or deleted from old_rows to turn
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// it into new_rows, and check all matching rows for modifications
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// If `move_candidates` is supplied they it will be used to do more accurate
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// determination of which rows moved. This is only supported when the rows
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// are in table order (i.e. not sorted or from a LinkList)
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static CollectionChangeBuilder calculate(std::vector<size_t> const& old_rows,
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std::vector<size_t> const& new_rows,
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std::function<bool (size_t)> row_did_change,
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util::Optional<IndexSet> const& move_candidates = util::none);
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// generic operations {
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CollectionChangeSet finalize() &&;
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void merge(CollectionChangeBuilder&&);
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void insert(size_t ndx, size_t count=1, bool track_moves=true);
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void modify(size_t ndx, size_t col=-1);
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void erase(size_t ndx);
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void clear(size_t old_size);
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// }
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// operations only implemented for LinkList semantics {
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void clean_up_stale_moves();
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void move(size_t from, size_t to);
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// }
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// operations only implemented for Row semantics {
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void move_over(size_t ndx, size_t last_ndx, bool track_moves=true);
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// must be followed by move_over(old_ndx, ...)
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// precondition: `new_ndx` must be a new insertion
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void subsume(size_t old_ndx, size_t new_ndx, bool track_moves=true);
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void swap(size_t ndx_1, size_t ndx_2, bool track_moves=true);
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void parse_complete();
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// }
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void insert_column(size_t ndx);
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void move_column(size_t from, size_t to);
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private:
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std::unordered_map<size_t, size_t> m_move_mapping;
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bool m_track_columns = true;
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template<typename Func>
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void for_each_col(Func&& f);
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void verify();
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};
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} // namespace _impl
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} // namespace realm
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#endif // REALM_COLLECTION_CHANGE_BUILDER_HPP
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