ScanCells.h

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/* -*- c++ -*-
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 3 of the
 * License, or any later version.
 *
 * Hypertable 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef Hypertable_Lib_ScanCells_h
#define Hypertable_Lib_ScanCells_h

#include <Hypertable/Lib/Cells.h>
#include <Hypertable/Lib/ProfileDataScanner.h>
#include <Hypertable/Lib/ScanBlock.h>
#include <Hypertable/Lib/ScanLimitState.h>
#include <Hypertable/Lib/Schema.h>

#include <Common/StringExt.h>

#include <memory>
#include <vector>

namespace Hypertable {
class IntervalScannerAsync;
namespace Lib {

  using namespace std;

  class ScanCells {

  public:
    ScanCells() : m_eos(false){}

    void get(Cells &cells) {
      if (m_cells) {
        m_cells->get(cells);
      }
      else {
        cells.clear();
      }
    }
    void get_cell_unchecked(Cell &cc, size_t ii) { m_cells->get_cell(cc, ii); }
    void set_eos(bool eos = true) { m_eos = eos; }
    bool get_eos() const { return m_eos; }
    size_t size() const {
      if (m_cells)
        return m_cells->size();
      else
        return 0;
    }

    bool empty() const {
      return size() == 0;
    }

    size_t memory_used() const {
      size_t mem_used=0;
      for (const auto &v : m_scanblocks) {
        mem_used += v->memory_used();
      }
      return mem_used;
    }

    ProfileDataScanner &profile_data() { return m_profile_data; }

    bool add(EventPtr &event, int *scanner_id);

    void add(Cell &cell, bool own = true);

    bool load(SchemaPtr &schema, const std::string &end_row, bool end_inclusive,
              ScanLimitState *limit_state, CstrSet &rowset,
              int64_t *bytes_scanned, Key *lastkey);

    int get_skipped_rows() {
      for (const auto &v : m_scanblocks) {
        if (v->get_skipped_rows())
          return (v->get_skipped_rows());
      }
      return 0;
    }

    int get_skipped_cells() {
      for (const auto &v : m_scanblocks) {
        if (v->get_skipped_cells())
          return (v->get_skipped_cells());
      }
      return 0;
    }

  protected:

    vector<ScanBlockPtr> m_scanblocks;
    CellsBuilderPtr m_cells;
    ProfileDataScanner m_profile_data;
    bool m_eos {};
  };

  typedef std::shared_ptr<ScanCells> ScanCellsPtr;

}}

#endif // Hypertable_Lib_ScanCells_h