//  Copyright (c) Meta Platforms, Inc. and affiliates.

//

//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).

//

// Copyright (c) 2011 The LevelDB Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file. See the AUTHORS file for names of contributors.

#include "db/compaction/compaction_state.h"

namespace ROCKSDB_NAMESPACE {

Slice CompactionState::SmallestUserKey() {

  for (const auto& sub_compact_state : sub_compact_states) {

    Slice smallest = sub_compact_state.SmallestUserKey();

    if (!smallest.empty()) {

      return smallest;

    }

  }

  // If there is no finished output, return an empty slice.

  return Slice{nullptr, 0};

}

Slice CompactionState::LargestUserKey() {

  for (auto it = sub_compact_states.rbegin(); it < sub_compact_states.rend();

       ++it) {

    Slice largest = it->LargestUserKey();

    if (!largest.empty()) {

      return largest;

    }

  }

  // If there is no finished output, return an empty slice.

  return Slice{nullptr, 0};

}

void CompactionState::AggregateCompactionStats(

    InternalStats::CompactionStatsFull& compaction_stats,

    CompactionJobStats& compaction_job_stats) {

  for (const auto& sc : sub_compact_states) {

    sc.AggregateCompactionStats(compaction_stats);

    compaction_job_stats.Add(sc.compaction_job_stats);

  }

}

}  // namespace ROCKSDB_NAMESPACE