SpatialQueryProcessor.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/SpatialQueryProcessor.h
 
  \brief A basic query processor for spatial restrictions.
*/
 
#ifndef __TERRALIB_DATAACCESS_INTERNAL_SPATIALQUERYPROCESSOR_H
#define __TERRALIB_DATAACCESS_INTERNAL_SPATIALQUERYPROCESSOR_H
 
// TerraLib
#include "../../common/Enums.h"
#include "../../geometry/Envelope.h"
#include "../dataset/DataSet.h"
#include "../dataset/ObjectIdSet.h"
#include "../datasource/DataSource.h"
 
// Boost
#include <boost/noncopyable.hpp>
 
// STL
#include <memory>
#include <vector>
 
namespace te
{
  namespace da
  {
// Forward declarations
    class DataSetType;
    class DataSourceTransactor;
    class QueryCapabilities;
    class Select;
    struct SpatialRestriction;
 
    /*!
      \class SpatialQueryProcessor
      
      \brief A basic query processor for spatial restrictions.
    */
    class TEDATAACCESSEXPORT SpatialQueryProcessor : public boost::noncopyable
    {
      public:
 
        /*! \brief Constructor. */
        SpatialQueryProcessor();
 
        /*! \brief Virtual destructor. */
        virtual ~SpatialQueryProcessor();
 
        virtual std::unique_ptr<DataSet> getDataSet(const DataSourcePtr& ds, const Select& q,
                                                  te::common::TraverseType travType = te::common::FORWARDONLY);
 
        virtual std::unique_ptr<DataSet> getDataSet(DataSourceTransactor* t, const QueryCapabilities& capabilities,
                                                  const Select& q,
                                                  te::common::TraverseType travType = te::common::FORWARDONLY,
                                                  bool connected = false);
 
        virtual std::unique_ptr<ObjectIdSet> getOIDSet(const DataSourcePtr& ds, const Select& q);
 
        virtual std::unique_ptr<ObjectIdSet> getOIDSet(DataSourceTransactor* t, const QueryCapabilities& capabilities, const Select& q);
 
      protected:
 
        virtual std::unique_ptr<ObjectIdSet> getOIDSet(DataSourceTransactor* t, const Select& q);
 
        virtual ObjectIdSet* getOIDSet(DataSourceTransactor* t, Select& baseSelect, te::da::Expression* attrRestrictions,
                                       SpatialRestriction* restriction, const DataSetType* type,
                                       const std::vector<te::gm::Geometry*>& geomRestrictions);
 
      private:
 
        bool supportsSpatialTopologicOperatos(const QueryCapabilities& capabilities,
                                              const std::vector<SpatialRestriction*>& restrictions) const;
 
        std::string getDataSetName(const Select& q) const;
 
        Expression* getAttrRestrictions(const Select& q) const;
 
      private:
 
        te::gm::Envelope* computeEnvelope(const std::vector<SpatialRestriction*>& restrictions) const;
    };
 
  } // end namespace da
}   // end namespace te
 
#endif  // __TERRALIB_DATAACCESS_INTERNAL_SPATIALQUERYPROCESSOR_H