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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2006 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
*
*****************************************************************************/
//$Id: shape_index_featureset.cc 36 2005-04-05 14:32:18Z pavlenko $
#include <mapnik/feature_factory.hpp>
// boost
#include <boost/iostreams/stream.hpp>
#include <boost/iostreams/device/file.hpp>
#include <boost/iostreams/device/mapped_file.hpp>
#include "shape_index_featureset.hpp"
using namespace boost::iostreams;
template <typename filterT>
shape_index_featureset<filterT>::shape_index_featureset(const filterT& filter,
const std::string& shape_file,
const std::set<std::string>& attribute_names,
std::string const& encoding)
: filter_(filter),
shape_type_(0),
shape_(shape_file),
tr_(new transcoder(encoding)),
count_(0)
{
shape_.shp().skip(100);
stream<mapped_file_source> file(shape_file + ".index");
if (file)
{
shp_index<filterT,stream<mapped_file_source> >::query(filter,file,ids_);
file.close();
}
std::sort(ids_.begin(),ids_.end());
#ifdef MAPNIK_DEBUG
std::clog<< "query size=" << ids_.size() << "\n";
#endif
itr_ = ids_.begin();
// deal with attributes
std::set<std::string>::const_iterator pos=attribute_names.begin();
while (pos!=attribute_names.end())
{
for (int i=0;i<shape_.dbf().num_fields();++i)
{
if (shape_.dbf().descriptor(i).name_ == *pos)
{
attr_ids_.insert(i);
break;
}
}
++pos;
}
}
template <typename filterT>
feature_ptr shape_index_featureset<filterT>::next()
{
using mapnik::feature_factory;
using mapnik::point_impl;
if (itr_!=ids_.end())
{
int pos=*itr_++;
shape_.move_to(pos);
int type=shape_.type();
feature_ptr feature(feature_factory::create(shape_.id_));
if (type==shape_io::shape_point)
{
double x=shape_.shp().read_double();
double y=shape_.shp().read_double();
geometry2d * point = new point_impl;
point->move_to(x,y);
feature->add_geometry(point);
++count_;
}
else if (type == shape_io::shape_pointm)
{
double x=shape_.shp().read_double();
double y=shape_.shp().read_double();
shape_.shp().read_double();// m
geometry2d * point = new point_impl;
point->move_to(x,y);
feature->add_geometry(point);
++count_;
}
else if (type == shape_io::shape_pointz)
{
double x=shape_.shp().read_double();
double y=shape_.shp().read_double();
shape_.shp().read_double();// z
shape_.shp().read_double();// m
geometry2d * point = new point_impl;
point->move_to(x,y);
feature->add_geometry(point);
++count_;
}
else
{
while(!filter_.pass(shape_.current_extent()) &&
itr_!=ids_.end())
{
pos=*itr_++;
shape_.move_to(pos);
}
switch (type)
{
case shape_io::shape_polyline:
{
geometry2d * line = shape_.read_polyline();
feature->add_geometry(line);
++count_;
break;
}
case shape_io::shape_polylinem:
{
geometry2d * line = shape_.read_polylinem();
feature->add_geometry(line);
++count_;
break;
}
case shape_io::shape_polylinez:
{
geometry2d * line = shape_.read_polylinez();
feature->add_geometry(line);
++count_;
break;
}
case shape_io::shape_polygon:
{
geometry2d * poly = shape_.read_polygon();
feature->add_geometry(poly);
++count_;
break;
}
case shape_io::shape_polygonm:
{
geometry2d * poly = shape_.read_polygonm();
feature->add_geometry(poly);
++count_;
break;
}
case shape_io::shape_polygonz:
{
geometry2d * poly = shape_.read_polygonz();
feature->add_geometry(poly);
++count_;
break;
}
}
}
if (attr_ids_.size())
{
shape_.dbf().move_to(shape_.id_);
std::set<int>::const_iterator pos=attr_ids_.begin();
while (pos!=attr_ids_.end())
{
try
{
shape_.dbf().add_attribute(*pos,*tr_,*feature);
}
catch (...)
{
std::clog<<"exception caught\n";
}
++pos;
}
}
return feature;
}
else
{
#ifdef MAPNIK_DEBUG
std::clog<<count_<<" features\n";
#endif
return feature_ptr();
}
}
template <typename filterT>
shape_index_featureset<filterT>::~shape_index_featureset() {}
template class shape_index_featureset<mapnik::filter_in_box>;
template class shape_index_featureset<mapnik::filter_at_point>;
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