////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 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
////////////////////////////////////////////////////////////////////////////////

#ifndef ARANGOD_MMFILES_MMFILES_PERSISTENT_INDEX_KEY_COMPARATOR_H
#define ARANGOD_MMFILES_MMFILES_PERSISTENT_INDEX_KEY_COMPARATOR_H 1

#include "Basics/Common.h"
#include "MMFiles/MMFilesPersistentIndex.h"

#include <rocksdb/comparator.h>
#include <rocksdb/slice.h>

#include <velocypack/Slice.h>

namespace arangodb {

class MMFilesPersistentIndexKeyComparator final : public rocksdb::Comparator {
 public:
  MMFilesPersistentIndexKeyComparator() = default;
  ~MMFilesPersistentIndexKeyComparator() = default;

  static inline arangodb::velocypack::Slice extractKeySlice(rocksdb::Slice const& slice) {
    return arangodb::velocypack::Slice(reinterpret_cast<uint8_t const*>(slice.data() + MMFilesPersistentIndex::keyPrefixSize()));
  }

  int Compare(rocksdb::Slice const& lhs, rocksdb::Slice const& rhs) const override;

  char const* Name() const override { return "ArangoComparator"; }

  void FindShortestSeparator(std::string*, rocksdb::Slice const&) const override {}
  void FindShortSuccessor(std::string*) const override {}
};

}  // namespace arangodb

#endif