Where.h

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/*  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.

    This file is part of the TerraLib - a Framework for building GIS enabled applications.

    TerraLib is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License,
    or (at your option) any later version.

    TerraLib 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with TerraLib. See COPYING. If not, write to
    TerraLib Team at <terralib-team@terralib.org>.
 */

/*!
  \file terralib/dataaccess/query/Where.h

  \brief A class that can be used to model a filter expression that can be applied to a query.
*/

#ifndef __TERRALIB_DATAACCESS_INTERNAL_WHERE_H
#define __TERRALIB_DATAACCESS_INTERNAL_WHERE_H

// TerraLib
#include "../Config.h"

// STL
#include <memory>

namespace te
{
  namespace da
  {
// Forward declaration
    class Expression;

    /*!
      \class Where

      \brief A class that can be used to model a filter expression that can be applied to a query.
    */
    class TEDATAACCESSEXPORT Where
    {
      public:

        /*!
          \brief Constructor.

          \param e The where expression.

          \note The Where clause will take the ownership of the expression.
        */
        explicit Where(Expression* e);

        explicit Where(const Expression& e);

        Where(const Where& rhs);

        ~Where();
        
        Where& operator=(const Where& rhs);

        Expression* getExp() const;

        /*!
          \brief Sets the expression.

          \param e The where expression.

          \note The Where clause will take the ownership of the expression.
        */
        void setExp(Expression* exp);

      private:

        std::unique_ptr<Expression> m_exp;  //!< The expression that defines the where clause.
    };

  } // end namespace da
}   // end namespace te

#endif  // __TERRALIB_DATAACCESS_INTERNAL_WHERE_H