text: #ifndef STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
  #define STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
  
  #include "leveldb/write_batch.h"
  
  namespace leveldb {
  
  class MemTable;
  
  // WriteBatchInternal provides static methods for manipulating a
  // WriteBatch that we don't want in the public WriteBatch interface.
  class WriteBatchInternal {
   public:
    // Return the number of entries in the batch.
    static int Count(const WriteBatch* batch);
  
    // Set the count for the number of entries in the batch.
    static void SetCount(WriteBatch* batch, int n);
  
    // Return the seqeunce number for the start of this batch.
    static SequenceNumber Sequence(const WriteBatch* batch);
  
    // Store the specified number as the seqeunce number for the start of
    // this batch.
    static void SetSequence(WriteBatch* batch, SequenceNumber seq);
  
    static Slice Contents(const WriteBatch* batch) {
      return Slice(batch->rep_);
    }
  
    static size_t ByteSize(const WriteBatch* batch) {
      return batch->rep_.size();
    }
  
    static void SetContents(WriteBatch* batch, const Slice& contents);
  
    static Status InsertInto(const WriteBatch* batch, MemTable* memtable);
  
    static void Append(WriteBatch* dst, const WriteBatch* src);
  };
  
  }  // namespace leveldb
  
  
  #endif  // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
  