/*
----
This file is part of SECONDO.

Copyright (C) 2004-2009, University in Hagen, Faculty of Mathematics
and Computer Science, Database Systems for New Applications.

SECONDO 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; either version 2 of the License, or
(at your option) any later version.

SECONDO 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 SECONDO; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
----

*/

#pragma once

#include "AlgebraTypes.h"
#include <cstdint>
#include "NestedList.h"
#include "Operator.h"
#include "SecondoSMI.h"
#include "Stream.h"
#include "../TBlock.h"
#include "../TypeConstructors/TBlockTC.h"
#include <vector>

namespace CRelAlgebra
{
  namespace Operators
  {
    class Project : public Operator
    {
    public:
      class Info
      {
      public:
        Info(const TBlockTI &blockTypeInfo, const ListExpr columnNames,
             bool invert = false);

        bool HasError() const;

        const std::string &GetError() const;

        const TBlockTI &GetBlockTypeInfo() const;

        const std::vector<uint64_t> &GetIndices() const;

        ListExpr GetIndicesExpr() const;

        ListExpr GetIndicesExpr(ListExpr listEnd) const;

      private:
        TBlockTI m_blockTypeInfo;

        std::vector<uint64_t> m_indices;

        std::string m_error;
      };

      Project();

    private:
      class State
      {
      public:
        State(ArgVector args, Supplier s);

        ~State();

        TBlock *Request();

      private:
        Stream<TBlock> m_stream;

        std::vector<uint64_t> m_indices;
      };

      static const OperatorInfo info;

      static ValueMapping valueMappings[];

      static ListExpr TypeMapping(ListExpr args);

      static int SelectValueMapping(ListExpr args);

      static int TBlockValueMapping(ArgVector args, Word &result, int message,
                                    Word &local, Supplier s);
    };
  }
}