Example #1
0
feature_ptr ogr_index_featureset<filterT>::next()
{
    while (itr_ != ids_.end())
    {
        int pos = *itr_++;
        layer_.SetNextByIndex (pos);

        OGRFeature *poFeature = layer_.GetNextFeature();
        if (poFeature == nullptr)
        {
            return feature_ptr();
        }

        // ogr feature ids start at 0, so add one to stay
        // consistent with other mapnik datasources that start at 1
        mapnik::value_integer feature_id = (poFeature->GetFID() + 1);
        feature_ptr feature(feature_factory::create(ctx_,feature_id));

        OGRGeometry* geom=poFeature->GetGeometryRef();
        if (geom && !geom->IsEmpty())
        {
            geom->getEnvelope(&feature_envelope_);
            if (!filter_.pass(mapnik::box2d<double>(feature_envelope_.MinX,feature_envelope_.MinY,
                                            feature_envelope_.MaxX,feature_envelope_.MaxY))) continue;
            auto geom_corrected = ogr_converter::convert_geometry(geom);
            mapnik::geometry::correct(geom_corrected);
            feature->set_geometry(std::move(geom_corrected));
        }
        else
        {
            MAPNIK_LOG_DEBUG(ogr) << "ogr_index_featureset: Feature with null geometry="
                << poFeature->GetFID();
            OGRFeature::DestroyFeature( poFeature );
            continue;
        }

        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:
            {
                feature->put<mapnik::value_integer>(fld_name,poFeature->GetFieldAsInteger (i));
                break;
            }
#if GDAL_VERSION_MAJOR >= 2
            case OFTInteger64:
            {
                feature->put<mapnik::value_integer>( fld_name, poFeature->GetFieldAsInteger64(i));
                break;
            }
#endif

            case OFTReal:
            {
                feature->put(fld_name,poFeature->GetFieldAsDouble (i));
                break;
            }

            case OFTString:
            case OFTWideString:     // deprecated !
            {
                feature->put(fld_name,tr_->transcode(poFeature->GetFieldAsString (i)));
                break;
            }

            case OFTIntegerList:
#if GDAL_VERSION_MAJOR >= 2
            case OFTInteger64List:
#endif
            case OFTRealList:
            case OFTStringList:
            case OFTWideStringList: // deprecated !
            {
                MAPNIK_LOG_WARN(ogr) << "ogr_index_featureset: Unhandled type_oid=" << type_oid;
                break;
            }

            case OFTBinary:
            {
                MAPNIK_LOG_WARN(ogr) << "ogr_index_featureset: Unhandled type_oid=" << type_oid;
                //feature->put(name,feat->GetFieldAsBinary (i, size));
                break;
            }

            case OFTDate:
            case OFTTime:
            case OFTDateTime:       // unhandled !
            {
                MAPNIK_LOG_WARN(ogr) << "ogr_index_featureset: Unhandled type_oid=" << type_oid;
                break;
            }
            }
        }
        OGRFeature::DestroyFeature( poFeature );
        return feature;
    }

    return feature_ptr();
}