Current File : //usr/include/boost/geometry/srs/projections/impl/pj_gridlist.hpp
// Boost.Geometry
// This file is manually converted from PROJ4
// This file was modified by Oracle on 2018, 2019.
// Modifications copyright (c) 2018-2019, Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// This file is converted from PROJ4, http://trac.osgeo.org/proj
// PROJ4 is originally written by Gerald Evenden (then of the USGS)
// PROJ4 is maintained by Frank Warmerdam
// This file was converted to Geometry Library by Adam Wulkiewicz
// Original copyright notice:
// Author: Frank Warmerdam, warmerdam@pobox.com
// Copyright (c) 2000, Frank Warmerdam
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#ifndef BOOST_GEOMETRY_SRS_PROJECTIONS_IMPL_PJ_GRIDLIST_HPP
#define BOOST_GEOMETRY_SRS_PROJECTIONS_IMPL_PJ_GRIDLIST_HPP
#include <boost/geometry/srs/projections/exception.hpp>
#include <boost/geometry/srs/projections/grids.hpp>
#include <boost/geometry/srs/projections/impl/pj_gridinfo.hpp>
#include <boost/geometry/srs/projections/impl/pj_strerrno.hpp>
#include <boost/geometry/srs/projections/par_data.hpp>
namespace boost { namespace geometry { namespace projections
{
namespace detail
{
/************************************************************************/
/* pj_gridlist_merge_grid() */
/* */
/* Find/load the named gridfile and merge it into the */
/* last_nadgrids_list. */
/************************************************************************/
// Originally one function, here divided into several functions
// with overloads for various types of grids and stream policies
inline bool pj_gridlist_find_all(std::string const& gridname,
pj_gridinfo const& grids,
std::vector<std::size_t> & gridindexes)
{
bool result = false;
for (std::size_t i = 0 ; i < grids.size() ; ++i)
{
if (grids[i].gridname == gridname)
{
result = true;
gridindexes.push_back(i);
}
}
return result;
}
// Fill container with sequentially increasing numbers
inline void pj_gridlist_add_seq_inc(std::vector<std::size_t> & gridindexes,
std::size_t first, std::size_t last)
{
gridindexes.reserve(gridindexes.size() + (last - first));
for ( ; first < last ; ++first)
{
gridindexes.push_back(first);
}
}
// Generic stream policy and standard grids
template <typename StreamPolicy, typename Grids>
inline bool pj_gridlist_merge_gridfile(std::string const& gridname,
StreamPolicy const& stream_policy,
Grids & grids,
std::vector<std::size_t> & gridindexes,
grids_tag)
{
// Try to find in the existing list of loaded grids. Add all
// matching grids as with NTv2 we can get many grids from one
// file (one shared gridname).
if (pj_gridlist_find_all(gridname, grids.gridinfo, gridindexes))
return true;
std::size_t orig_size = grids.gridinfo.size();
// Try to load the named grid.
typename StreamPolicy::stream_type is;
stream_policy.open(is, gridname);
if (! pj_gridinfo_init(gridname, is, grids.gridinfo))
{
return false;
}
// Add the grid now that it is loaded.
pj_gridlist_add_seq_inc(gridindexes, orig_size, grids.gridinfo.size());
return true;
}
// Generic stream policy and shared grids
template <typename StreamPolicy, typename SharedGrids>
inline bool pj_gridlist_merge_gridfile(std::string const& gridname,
StreamPolicy const& stream_policy,
SharedGrids & grids,
std::vector<std::size_t> & gridindexes,
shared_grids_tag)
{
// Try to find in the existing list of loaded grids. Add all
// matching grids as with NTv2 we can get many grids from one
// file (one shared gridname).
{
typename SharedGrids::read_locked lck_grids(grids);
if (pj_gridlist_find_all(gridname, lck_grids.gridinfo, gridindexes))
return true;
}
// Try to load the named grid.
typename StreamPolicy::stream_type is;
stream_policy.open(is, gridname);
pj_gridinfo new_grids;
if (! pj_gridinfo_init(gridname, is, new_grids))
{
return false;
}
// Add the grid now that it is loaded.
std::size_t orig_size = 0;
std::size_t new_size = 0;
{
typename SharedGrids::write_locked lck_grids(grids);
// Try to find in the existing list of loaded grids again
// in case other thread already added it.
if (pj_gridlist_find_all(gridname, lck_grids.gridinfo, gridindexes))
return true;
orig_size = lck_grids.gridinfo.size();
new_size = orig_size + new_grids.size();
lck_grids.gridinfo.resize(new_size);
for (std::size_t i = 0 ; i < new_grids.size() ; ++ i)
new_grids[i].swap(lck_grids.gridinfo[i + orig_size]);
}
pj_gridlist_add_seq_inc(gridindexes, orig_size, new_size);
return true;
}
/************************************************************************/
/* pj_gridlist_from_nadgrids() */
/* */
/* This functions loads the list of grids corresponding to a */
/* particular nadgrids string into a list, and returns it. The */
/* list is kept around till a request is made with a different */
/* string in order to cut down on the string parsing cost, and */
/* the cost of building the list of tables each time. */
/************************************************************************/
template <typename StreamPolicy, typename Grids>
inline void pj_gridlist_from_nadgrids(srs::detail::nadgrids const& nadgrids,
StreamPolicy const& stream_policy,
Grids & grids,
std::vector<std::size_t> & gridindexes)
{
// Loop processing names out of nadgrids one at a time.
for (srs::detail::nadgrids::const_iterator it = nadgrids.begin() ;
it != nadgrids.end() ; ++it)
{
bool required = (*it)[0] != '@';
std::string name(it->begin() + (required ? 0 : 1), it->end());
if ( ! pj_gridlist_merge_gridfile(name, stream_policy, grids, gridindexes,
typename Grids::tag())
&& required )
{
BOOST_THROW_EXCEPTION( projection_exception(error_failed_to_load_grid) );
}
}
}
template <typename Par, typename ProjectionGrids>
inline void pj_gridlist_from_nadgrids(Par const& defn, ProjectionGrids & proj_grids)
{
pj_gridlist_from_nadgrids(defn.nadgrids,
proj_grids.grids_storage().stream_policy,
proj_grids.grids_storage().hgrids,
proj_grids.hindexes);
}
} // namespace detail
}}} // namespace boost::geometry::projections
#endif // BOOST_GEOMETRY_SRS_PROJECTIONS_IMPL_PJ_GRIDLIST_HPP
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