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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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
*
*****************************************************************************/
#include "rasterlite_datasource.hpp"
#include "rasterlite_featureset.hpp"
// boost
#include <boost/filesystem/operations.hpp>
#include <boost/make_shared.hpp>
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/boolean.hpp>
#include <mapnik/geom_util.hpp>
using mapnik::datasource;
using mapnik::parameters;
DATASOURCE_PLUGIN(rasterlite_datasource)
using mapnik::box2d;
using mapnik::coord2d;
using mapnik::query;
using mapnik::featureset_ptr;
using mapnik::layer_descriptor;
using mapnik::datasource_exception;
/*
* Opens a GDALDataset and returns a pointer to it.
* Caller is responsible for calling GDALClose on it
*/
inline void* rasterlite_datasource::open_dataset() const
{
void* dataset = rasterliteOpen (dataset_name_.c_str(), table_name_.c_str());
if (! dataset)
{
throw datasource_exception("Rasterlite Plugin: Error opening dataset");
}
if (rasterliteIsError (dataset))
{
std::string error (rasterliteGetLastError(dataset));
rasterliteClose (dataset);
throw datasource_exception(error);
}
return dataset;
}
rasterlite_datasource::rasterlite_datasource(parameters const& params, bool bind)
: datasource(params),
desc_(*params.get<std::string>("type"),"utf-8")
{
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: Initializing...";
boost::optional<std::string> file = params.get<std::string>("file");
if (!file) throw datasource_exception("missing <file> parameter");
boost::optional<std::string> table = params.get<std::string>("table");
if (!table) throw datasource_exception("missing <table> parameter");
table_name_ = *table;
boost::optional<std::string> base = params.get<std::string>("base");
if (base)
dataset_name_ = *base + "/" + *file;
else
dataset_name_ = *file;
if (bind)
{
this->bind();
}
}
void rasterlite_datasource::bind() const
{
if (is_bound_) return;
if (!boost::filesystem::exists(dataset_name_)) throw datasource_exception(dataset_name_ + " does not exist");
void *dataset = open_dataset();
double x0, y0, x1, y1;
if (rasterliteGetExtent (dataset, &x0, &y0, &x1, &y1) != RASTERLITE_OK)
{
std::string error (rasterliteGetLastError(dataset));
rasterliteClose (dataset);
throw datasource_exception(error);
}
extent_.init(x0,y0,x1,y1);
#ifdef MAPNIK_LOG
int srid, auth_srid;
const char *auth_name;
const char *ref_sys_name;
const char *proj4text;
int tile_count;
double pixel_x_size, pixel_y_size;
int levels = rasterliteGetLevels (dataset);
if (rasterliteGetSrid(dataset, &srid, &auth_name, &auth_srid, &ref_sys_name, &proj4text) != RASTERLITE_OK)
{
std::string error (rasterliteGetLastError(dataset));
rasterliteClose (dataset);
throw datasource_exception(error);
}
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: Data Source=" << rasterliteGetTablePrefix(dataset);
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: SRID=" << srid;
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: Authority=" << auth_name;
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: AuthSRID=" << auth_srid;
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: RefSys Name=" << ref_sys_name;
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: Proj4Text=" << proj4text;
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: Extent=" << x0 << "," << y0 << " " << x1 << "," << y1 << ")";
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: Levels=" << levels;
for (int i = 0; i < levels; i++)
{
if (rasterliteGetResolution(dataset, i, &pixel_x_size, &pixel_y_size, &tile_count) == RASTERLITE_OK)
{
MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_datasource: Level=" << i
<< " x=" << pixel_x_size
<< " y=" << pixel_y_size
<< " tiles=" << tile_count;
}
}
#endif
rasterliteClose(dataset);
is_bound_ = true;
}
rasterlite_datasource::~rasterlite_datasource()
{
}
const char * rasterlite_datasource::name()
{
return "rasterlite";
}
mapnik::datasource::datasource_t rasterlite_datasource::type() const
{
return datasource::Raster;
}
box2d<double> rasterlite_datasource::envelope() const
{
if (!is_bound_) bind();
return extent_;
}
boost::optional<mapnik::datasource::geometry_t> rasterlite_datasource::get_geometry_type() const
{
return boost::optional<mapnik::datasource::geometry_t>();
}
layer_descriptor rasterlite_datasource::get_descriptor() const
{
return desc_;
}
featureset_ptr rasterlite_datasource::features(query const& q) const
{
if (!is_bound_) bind();
rasterlite_query gq = q;
return boost::make_shared<rasterlite_featureset>(open_dataset(), gq);
}
featureset_ptr rasterlite_datasource::features_at_point(coord2d const& pt, double tol) const
{
if (!is_bound_) bind();
rasterlite_query gq = pt;
return boost::make_shared<rasterlite_featureset>(open_dataset(), gq);
}
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