SQLVisitor.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/postgis/SQLVisitor.h
 
  \brief A visitor for building an SQL statement using PostGIS dialect.
*/
 
#ifndef __TERRALIB_POSTGIS_INTERNAL_SQLVISITOR_H
#define __TERRALIB_POSTGIS_INTERNAL_SQLVISITOR_H
 
// TerraLib
#include "../dataaccess/query/SQLVisitor.h"
#include "Config.h"
 
// Boost
#include <boost/noncopyable.hpp>
 
// Forward declaration for libpq
extern "C"
{
struct pg_conn;
typedef struct pg_conn PGconn;
}
 
namespace te
{
  namespace pgis
  {
    /*!
      \class SQLVisitor
      
      \brief A visitor for building an SQL statement using PostGIS dialect.
    */
    class TEPGISEXPORT SQLVisitor : public te::da::SQLVisitor
    {
      public:
 
        /** @name Initializer Methods
         *  Methods related to instantiation and destruction.
         */
        //@{
 
        /*! \brief Default constructor. */
        SQLVisitor(const te::da::SQLDialect& dialect, std::string& sql, PGconn* conn);
 
        /*! \brief Destructor. */
        ~SQLVisitor() {}
 
        //@}
 
        /** @name Select
         *  All concrete visitors must implement these methods.
         */
        //@{
 
        void visit(const te::da::LiteralByteArray& visited);
        void visit(const te::da::LiteralDateTime& visited);
        void visit(const te::da::LiteralEnvelope& visited);
        void visit(const te::da::LiteralGeom& visited);
        void visit(const te::da::LiteralString& visited);
 
        //@}
 
      private:
 
        PGconn* m_conn; //!< The PostGIS connection used to escape string!
    };
 
  } // end namespace pgis
}   // end namespace te
 
#endif  // __TERRALIB_POSTGIS_INTERNAL_SQLVISITOR_H