text: // record_data.h
  
  /**
   *    Copyright (C) 2014 MongoDB Inc.
   *
   *    This program is free software: you can redistribute it and/or  modify
   *    it under the terms of the GNU Affero General Public License, version 3,
   *    as published by the Free Software Foundation.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    GNU Affero General Public License for more details.
   *
   *    You should have received a copy of the GNU Affero General Public License
   *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   *    As a special exception, the copyright holders give permission to link the
   *    code of portions of this program with the OpenSSL library under certain
   *    conditions as described in each individual source file and distribute
   *    linked combinations including the program with the OpenSSL library. You
   *    must comply with the GNU Affero General Public License in all respects for
   *    all of the code used other than as permitted herein. If you modify file(s)
   *    with this exception, you may extend this exception to your version of the
   *    file(s), but you are not obligated to do so. If you do not wish to do so,
   *    delete this exception statement from your version. If you delete this
   *    exception statement from all source files in the program, then also delete
   *    it in the license file.
   */
  
  #pragma once
  
  #include "mongo/bson/bsonobj.h"
  #include "mongo/util/shared_buffer.h"
  
  namespace mongo {
  
      /**
       * A replacement for the Record class. This class represents data in a record store.
       * The _dataPtr attribute is used to manage memory ownership. If _dataPtr is NULL, then
       * the memory pointed to by _data is owned by the RecordStore. If _dataPtr is not NULL, then
       * it must point to the same array as _data.
       */
      class RecordData {
      public:
          RecordData() : _data( NULL ), _size( 0 ) {}
          RecordData(const char* data, int size): _data(data), _size(size) { }
  
          RecordData(SharedBuffer ownedData, int size)
                  : _data(ownedData.get()), _size(size), _ownedData(ownedData.moveFrom()) {
          }
  
          const char* data() const { return _data; }
  
          int size() const { return _size; }
  
          /**
           * Returns true if this owns its own memory, and false otherwise
           */
          bool isOwned() const { return _ownedData.get(); }
  
          SharedBuffer releaseBuffer() {
              return _ownedData.moveFrom();
          }
  
          BSONObj toBson() const { return isOwned() ? BSONObj(_ownedData) : BSONObj(_data); }
  
          BSONObj releaseToBson() { return isOwned() ? BSONObj(releaseBuffer()) : BSONObj(_data); }
  
          // TODO uncomment once we require compilers that support overloading for rvalue this.
          // BSONObj toBson() && { return releaseToBson(); }
  
      private:
          const char* _data;
          int _size;
          SharedBuffer _ownedData;
      };
  
  } // namespace mongo
  