Expression.h

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/*  Copyright (C) 2011-2011 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/serialization/fe/Expression.h
   
  \brief Auxiliary classes and functions to serialize filter expressions from a XML document.
*/

#ifndef __TERRALIB_SERIALIZATION_FE_INTERNAL_EXPRESSION_H
#define __TERRALIB_SERIALIZATION_FE_INTERNAL_EXPRESSION_H

// TerraLib
#include "../../common/Singleton.h"
#include "../../fe/Visitor.h"
#include "../Config.h"

// STL
#include <map>
#include <string>

// Boost
#include <boost/function.hpp>

namespace te
{
  namespace fe { class Expression; }

  namespace xml
  {
    class Reader;
    class Writer;
  }

  namespace serialize
  {
    class TESERIALIZATIONEXPORT Expression : public te::common::Singleton<Expression>, public te::fe::Visitor
    {
      friend class te::common::Singleton<Expression>;

      public:

        typedef boost::function<te::fe::Expression* (te::xml::Reader&)> ExpressionReadFnctType;
        typedef std::map<std::string, ExpressionReadFnctType> ExpressionFnctIdxType;

        void reg(const std::string& expName, const ExpressionReadFnctType& fnct);

        te::fe::Expression* read(te::xml::Reader& reader) const;

        void write(const te::fe::Expression* exp, te::xml::Writer& writer);

        /** @name Visitor Methods
         *  All concrete visitors must implement these methods.
         */
        //@{

        void visit(const te::fe::BinaryOperator& visited);
        void visit(const te::fe::Function& visited);
        void visit(const te::fe::Literal& visited);
        void visit(const te::fe::PropertyName& visited);

        void visit(const te::fe::AbstractOp& visited)         { /* no need */ }
        void visit(const te::fe::SpatialOp& visited)          { /* no need */ }
        void visit(const te::fe::ComparisonOp& visited)       { /* no need */ }
        void visit(const te::fe::LogicOp& visited)            { /* no need */ }
        void visit(const te::fe::BBOXOp& visited)             { /* no need */ }
        void visit(const te::fe::BinaryComparisonOp& visited) { /* no need */ }
        void visit(const te::fe::BinaryLogicOp& visited)      { /* no need */ }
        void visit(const te::fe::BinarySpatialOp& visited)    { /* no need */ }
        void visit(const te::fe::DistanceBuffer& visited)     { /* no need */ }
        void visit(const te::fe::PropertyIsBetween& visited)  { /* no need */ }
        void visit(const te::fe::PropertyIsLike& visited)     { /* no need */ }
        void visit(const te::fe::PropertyIsNull& visited)     { /* no need */ }
        void visit(const te::fe::UnaryLogicOp& visited)       { /* no need */ }
        void visit(const te::fe::Expression& visited)         { /* no need */ }

        //@}

        ~Expression();

      protected:

        Expression();

      private:

        ExpressionFnctIdxType m_fncts;
        te::xml::Writer* m_writer;
    };

  } // end namespace serialize
}   // end namespace te

#endif  // __TERRALIB_SERIALIZATION_FE_INTERNAL_EXPRESSION_H