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arangodb/arangod/RocksDBEngine/RocksDBComparator.h

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C++

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