mirror of https://gitee.com/bigwinds/arangodb
66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2017 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Daniel H. Larkin
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGO_ROCKSDB_ROCKSDB_COMPARATOR_H
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#define ARANGO_ROCKSDB_ROCKSDB_COMPARATOR_H 1
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#include "Basics/Common.h"
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#include <rocksdb/comparator.h>
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#include <rocksdb/slice.h>
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namespace arangodb {
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class RocksDBVPackComparator final : public rocksdb::Comparator {
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public:
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RocksDBVPackComparator() = default;
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~RocksDBVPackComparator() = default;
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/// @brief Compares any two RocksDB keys.
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/// returns < 0 if lhs < rhs
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/// > 0 if lhs > rhs
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/// 0 if lhs == rhs
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int Compare(rocksdb::Slice const& lhs, rocksdb::Slice const& rhs) const override {
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return compareIndexValues(lhs, rhs);
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}
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bool Equal(rocksdb::Slice const& lhs, rocksdb::Slice const& rhs) const override {
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return (compareIndexValues(lhs, rhs) == 0);
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}
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// SECTION: API compatibility
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char const* Name() const override { return "RocksDBVPackComparator"; }
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void FindShortestSeparator(std::string*, rocksdb::Slice const&) const override {}
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void FindShortSuccessor(std::string*) const override {}
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private:
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/// @brief Compares two IndexValue keys or two UniqueIndexValue keys
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/// (containing VelocyPack data and more).
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int compareIndexValues(rocksdb::Slice const& lhs, rocksdb::Slice const& rhs) const;
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};
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} // namespace arangodb
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#endif
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