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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2025 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
*
*****************************************************************************
*
* Initially developed by Sandro Santilli <strk@keybit.net> for CartoDB
*
*****************************************************************************/
#include "pgraster_featureset.hpp"
#include "pgraster_wkb_reader.hpp"
#include "../postgis/resultset.hpp"
#include "../postgis/cursorresultset.hpp"
#include "../postgis/numeric2string.hpp"
// mapnik
#include <mapnik/global.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/unicode.hpp>
#include <mapnik/value/types.hpp>
#include <mapnik/feature_factory.hpp>
#include <mapnik/view_transform.hpp>
#include <mapnik/raster.hpp>
#include <mapnik/image.hpp>
#include <mapnik/util/conversions.hpp>
#include <mapnik/util/trim.hpp>
#include <mapnik/global.hpp> // for int2net
// stl
#include <sstream>
#include <string>
using mapnik::context_ptr;
using mapnik::feature_factory;
pgraster_featureset::pgraster_featureset(std::shared_ptr<IResultSet> const& rs,
context_ptr const& ctx,
std::string const& encoding,
bool key_field,
int bandno)
: rs_(rs),
ctx_(ctx),
tr_(new transcoder(encoding)),
feature_id_(1),
key_field_(key_field),
band_(bandno)
{}
feature_ptr pgraster_featureset::next()
{
while (rs_->next())
{
// new feature
unsigned pos = 1;
feature_ptr feature;
if (key_field_)
{
std::string name = rs_->getFieldName(pos);
// null feature id is not acceptable
if (rs_->isNull(pos))
{
MAPNIK_LOG_WARN(pgraster) << "pgraster_featureset: null value encountered for key_field: " << name;
continue;
}
// create feature with user driven id from attribute
int oid = rs_->getTypeOID(pos);
char const* buf = rs_->getValue(pos);
// validation happens of this type at initialization
mapnik::value_integer val;
if (oid == 20)
{
val = int8net(buf);
}
else if (oid == 21)
{
val = int2net(buf);
}
else
{
val = int4net(buf);
}
MAPNIK_LOG_WARN(pgraster) << "pgraster_featureset: feature key: " << val;
feature = feature_factory::create(ctx_, val);
// TODO - extend feature class to know
// that its id is also an attribute to avoid
// this duplication
feature->put<mapnik::value_integer>(name, val);
++pos;
}
else
{
// fallback to auto-incrementing id
MAPNIK_LOG_WARN(pgraster) << "pgraster_featureset: feature id: " << feature_id_;
feature = feature_factory::create(ctx_, feature_id_);
++feature_id_;
}
// null geometry is not acceptable
if (rs_->isNull(0))
{
MAPNIK_LOG_WARN(pgraster) << "pgraster_featureset: null value encountered for raster";
continue;
}
// parse geometry
int size = rs_->getFieldLength(0);
uint8_t const* data = (uint8_t const*)rs_->getValue(0);
mapnik::raster_ptr raster = pgraster_wkb_reader::read(data, size, band_);
if (!raster)
{
MAPNIK_LOG_WARN(pgraster) << "pgraster_featureset: could not parse raster wkb";
// TODO: throw an exception ?
continue;
}
MAPNIK_LOG_WARN(pgraster) << "pgraster_featureset: raster of " << raster->data_.width() << "x"
<< raster->data_.height() << " pixels covering extent " << raster->ext_;
feature->set_raster(raster);
unsigned num_attrs = ctx_->size() + 1;
for (; pos < num_attrs; ++pos)
{
std::string name = rs_->getFieldName(pos);
// NOTE: we intentionally do not store null here
// since it is equivalent to the attribute not existing
if (!rs_->isNull(pos))
{
char const* buf = rs_->getValue(pos);
int const oid = rs_->getTypeOID(pos);
switch (oid)
{
case 16: // bool
{
feature->put(name, (buf[0] != 0));
break;
}
case 23: // int4
{
feature->put<mapnik::value_integer>(name, int4net(buf));
break;
}
case 21: // int2
{
feature->put<mapnik::value_integer>(name, int2net(buf));
break;
}
case 20: // int8/BigInt
{
feature->put<mapnik::value_integer>(name, int8net(buf));
break;
}
case 700: // float4
{
float val;
float4net(val, buf);
feature->put(name, static_cast<double>(val));
break;
}
case 701: // float8
{
double val;
float8net(val, buf);
feature->put(name, val);
break;
}
case 25: // text
case 1043: // varchar
case 705: // literal
{
feature->put(name, tr_->transcode(buf));
break;
}
case 1042: // bpchar
{
std::string str = mapnik::util::trim_copy(buf);
feature->put(name, tr_->transcode(str.c_str()));
break;
}
case 1700: // numeric
{
double val;
std::string str = numeric2string(buf);
if (mapnik::util::string2double(str, val))
{
feature->put(name, val);
}
break;
}
default: {
MAPNIK_LOG_WARN(pgraster) << "pgraster_featureset: Unknown type_oid=" << oid;
break;
}
}
}
}
return feature;
}
return feature_ptr();
}
pgraster_featureset::~pgraster_featureset()
{
rs_->close();
}
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