git / moonbite-core / src/leveldb/table/block_builder.h · raw

// 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.#ifndef STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_#define STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_#include <stdint.h>#include <vector>#include "leveldb/slice.h"namespace leveldb {struct Options;class BlockBuilder { public:  explicit BlockBuilder(const Options* options);  BlockBuilder(const BlockBuilder&) = delete;  BlockBuilder& operator=(const BlockBuilder&) = delete;  // Reset the contents as if the BlockBuilder was just constructed.  void Reset();  // REQUIRES: Finish() has not been called since the last call to Reset().  // REQUIRES: key is larger than any previously added key  void Add(const Slice& key, const Slice& value);  // Finish building the block and return a slice that refers to the  // block contents.  The returned slice will remain valid for the  // lifetime of this builder or until Reset() is called.  Slice Finish();  // Returns an estimate of the current (uncompressed) size of the block  // we are building.  size_t CurrentSizeEstimate() const;  // Return true iff no entries have been added since the last Reset()  bool empty() const { return buffer_.empty(); } private:  const Options* options_;  std::string buffer_;              // Destination buffer  std::vector<uint32_t> restarts_;  // Restart points  int counter_;                     // Number of entries emitted since restart  bool finished_;                   // Has Finish() been called?  std::string last_key_;};}  // namespace leveldb#endif  // STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_