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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 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
*
*****************************************************************************/
// mapnik
#include <mapnik/global.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/feature_layer_desc.hpp>
#include <mapnik/wkb.hpp>
#include <mapnik/unicode.hpp>
#include <mapnik/value_types.hpp>
#include <mapnik/feature_factory.hpp>
#include <mapnik/geometry_is_empty.hpp>
#include <mapnik/geometry_envelope.hpp>
// ogr
#include "sqlite_featureset.hpp"
#include "sqlite_utils.hpp"
using mapnik::query;
using mapnik::box2d;
using mapnik::feature_ptr;
using mapnik::geometry_utils;
using mapnik::transcoder;
using mapnik::feature_factory;
sqlite_featureset::sqlite_featureset(std::shared_ptr<sqlite_resultset> rs,
mapnik::context_ptr const& ctx,
std::string const& encoding,
mapnik::box2d<double> const& bbox,
mapnik::wkbFormat format,
bool spatial_index,
bool using_subquery)
: rs_(rs),
ctx_(ctx),
tr_(new transcoder(encoding)),
bbox_(bbox),
format_(format),
spatial_index_(spatial_index),
using_subquery_(using_subquery)
{}
sqlite_featureset::~sqlite_featureset() {}
feature_ptr sqlite_featureset::next()
{
while (rs_->is_valid () && rs_->step_next ())
{
int size;
const char* data = (const char*) rs_->column_blob(0, size);
if (data == 0)
{
return feature_ptr();
}
// null feature id is not acceptable
if (rs_->column_type(1) == SQLITE_NULL)
{
MAPNIK_LOG_ERROR(postgis) << "sqlite_featureset: null value encountered for key_field";
continue;
}
feature_ptr feature = feature_factory::create(ctx_,rs_->column_integer64(1));
mapnik::geometry::geometry<double> geom = geometry_utils::from_wkb(data, size, format_);
if (mapnik::geometry::is_empty(geom))
{
continue;
}
if (!spatial_index_)
{
// we are not using r-tree index, check if feature intersects bounding box
box2d<double> bbox = mapnik::geometry::envelope(geom);
if (!bbox_.intersects(bbox))
continue;
}
feature->set_geometry(std::move(geom));
for (int i = 2; i < rs_->column_count(); ++i)
{
const int type_oid = rs_->column_type(i);
const char* fld_name = rs_->column_name(i);
if (! fld_name)
continue;
std::string fld_name_str(fld_name);
// subqueries in sqlite lead to field double quoting which we need to strip
if (using_subquery_)
{
sqlite_utils::dequote(fld_name_str);
}
switch (type_oid)
{
case SQLITE_INTEGER:
{
feature->put<mapnik::value_integer>(fld_name_str, rs_->column_integer64(i));
break;
}
case SQLITE_FLOAT:
{
feature->put(fld_name_str, rs_->column_double(i));
break;
}
case SQLITE_TEXT:
{
int text_col_size;
const char * text_data = rs_->column_text(i, text_col_size);
feature->put(fld_name_str, tr_->transcode(text_data, text_col_size));
break;
}
case SQLITE_NULL:
{
// NOTE: we intentionally do not store null here
// since it is equivalent to the attribute not existing
break;
}
case SQLITE_BLOB:
break;
default:
MAPNIK_LOG_WARN(sqlite) << "sqlite_featureset: Field=" << fld_name_str << " unhandled type_oid=" << type_oid;
break;
}
}
return feature;
}
return feature_ptr();
}
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