mapnik/plugins/input/ogr/ogr_featureset.cpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2007 Artem Pavlenko
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/
//$Id$

#include <mapnik/global.hpp>
#include <mapnik/datasource.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/feature_layer_desc.hpp>
#include <mapnik/wkb.hpp>
#include <mapnik/unicode.hpp>

// ogr
#include "ogr_featureset.hpp"
#include "ogr_converter.hpp"
#include "ogr_feature_ptr.hpp"

using std::clog;
using std::endl;

using mapnik::query;
using mapnik::box2d;
using mapnik::CoordTransform;
using mapnik::Feature;
using mapnik::feature_ptr;
using mapnik::geometry_utils;
using mapnik::transcoder;


ogr_featureset::ogr_featureset(OGRDataSource & dataset,
                               OGRLayer & layer,
                               OGRGeometry & extent,
                               const std::string& encoding,
                               const bool multiple_geometries)
   : dataset_(dataset),
     layer_(layer),
     layerdef_(layer.GetLayerDefn()),
     tr_(new transcoder(encoding)),
     fidcolumn_(layer_.GetFIDColumn ()),
     multiple_geometries_(multiple_geometries),
     count_(0)
{
    layer_.SetSpatialFilter (&extent);
}

ogr_featureset::ogr_featureset(OGRDataSource & dataset,
                               OGRLayer & layer,
                               const mapnik::box2d<double> & extent,
                               const std::string& encoding,
                               const bool multiple_geometries)
   : dataset_(dataset),
     layer_(layer),
     layerdef_(layer.GetLayerDefn()),
     tr_(new transcoder(encoding)),
     fidcolumn_(layer_.GetFIDColumn ()),
     multiple_geometries_(multiple_geometries),
     count_(0)
{
    layer_.SetSpatialFilterRect (extent.minx(),
                                 extent.miny(),
                                 extent.maxx(),
                                 extent.maxy());
}

ogr_featureset::~ogr_featureset() {}

feature_ptr ogr_featureset::next()
{
   ogr_feature_ptr feat (layer_.GetNextFeature());
   if ((*feat) != NULL)
   {
      OGRGeometry* geom=(*feat)->GetGeometryRef();
      if (geom && !geom->IsEmpty())
      {
          feature_ptr feature(new Feature((*feat)->GetFID()));

          ogr_converter::convert_geometry (geom, feature, multiple_geometries_);
          ++count_;

          int fld_count = layerdef_->GetFieldCount();
          for (int i = 0; i < fld_count; i++)
          {
              OGRFieldDefn* fld = layerdef_->GetFieldDefn (i);
              OGRFieldType type_oid = fld->GetType ();
              std::string fld_name = fld->GetNameRef ();

              switch (type_oid)
              {
               case OFTInteger:
               {
                   boost::put(*feature,fld_name,(*feat)->GetFieldAsInteger (i));
                   break;
               }

               case OFTReal:
               {
                   boost::put(*feature,fld_name,(*feat)->GetFieldAsDouble (i));
                   break;
               }
                       
               case OFTString:
               case OFTWideString:     // deprecated !
               {
                   UnicodeString ustr = tr_->transcode((*feat)->GetFieldAsString (i));
                   boost::put(*feature,fld_name,ustr);
                   break;
               }

               case OFTIntegerList:
               case OFTRealList:
               case OFTStringList:
               case OFTWideStringList: // deprecated !
               {
#ifdef MAPNIK_DEBUG
                   clog << "unhandled type_oid=" << type_oid << endl;
#endif
                   break;
               }

               case OFTBinary:
               {
#ifdef MAPNIK_DEBUG
                   clog << "unhandled type_oid=" << type_oid << endl;
#endif
                   //boost::put(*feature,name,feat->GetFieldAsBinary (i, size));
                   break;
               }
                   
               case OFTDate:
               case OFTTime:
               case OFTDateTime:       // unhandled !
               {
#ifdef MAPNIK_DEBUG
                   clog << "unhandled type_oid=" << type_oid << endl;
#endif
                   break;
               }

               default: // unknown
               {
#ifdef MAPNIK_DEBUG
                   clog << "unknown type_oid=" << type_oid << endl;
#endif
                   break;
               }
              }
          }
      
          return feature;
      }
   }

#ifdef MAPNIK_DEBUG
   clog << count_ << " features" << endl;
#endif
   return feature_ptr();
}