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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
*
*****************************************************************************/
#include <iostream>
#include <fstream>
#include <stdexcept>
#include <mapnik/geom_util.hpp>
#include "shape_featureset.hpp"
#include "shape_index_featureset.hpp"
#include "shape.hpp"
DATASOURCE_PLUGIN(shape_datasource)
using mapnik::String;
using mapnik::Double;
using mapnik::Integer;
using mapnik::datasource_exception;
using mapnik::filter_in_box;
using mapnik::filter_at_point;
using mapnik::attribute_descriptor;
shape_datasource::shape_datasource(const parameters ¶ms)
: datasource (params),
type_(datasource::Vector),
file_length_(0),
indexed_(false),
desc_(*params.get<std::string>("type"), *params.get<std::string>("encoding","utf-8"))
{
boost::optional<std::string> base = params.get<std::string>("base");
if (base)
shape_name_ = *base + "/" + *params_.get<std::string>("file","");
else
shape_name_ = *params_.get<std::string>("file","");
try
{
shape_io shape(shape_name_);
init(shape);
for (int i=0;i<shape.dbf().num_fields();++i)
{
field_descriptor const& fd=shape.dbf().descriptor(i);
std::string fld_name=fd.name_;
switch (fd.type_)
{
case 'C':
case 'D':
case 'M':
case 'L':
desc_.add_descriptor(attribute_descriptor(fld_name, String));
break;
case 'N':
case 'F':
{
if (fd.dec_>0)
{
desc_.add_descriptor(attribute_descriptor(fld_name,Double,false,8));
}
else
{
desc_.add_descriptor(attribute_descriptor(fld_name,Integer,false,4));
}
break;
}
default:
#ifdef MAPNIK_DEBUG
std::clog << "unknown type "<<fd.type_<<"\n";
#endif
break;
}
}
}
catch (datasource_exception& ex)
{
std::clog<<ex.what()<<std::endl;
throw;
}
catch (...)
{
std::clog << " got exception ... \n";
throw;
}
}
shape_datasource::~shape_datasource() {}
const std::string shape_datasource::name_="shape";
void shape_datasource::init(shape_io& shape)
{
//first read header from *.shp
int file_code=shape.shp().read_xdr_integer();
if (file_code!=9994)
{
//invalid
throw datasource_exception("wrong file code");
}
shape.shp().skip(5*4);
file_length_=shape.shp().read_xdr_integer();
int version=shape.shp().read_ndr_integer();
if (version!=1000)
{
//invalid version number
throw datasource_exception("invalid version number");
}
#ifdef MAPNIK_DEBUG
int shape_type = shape.shp().read_ndr_integer();
#else
shape.shp().skip(4);
#endif
shape.shp().read_envelope(extent_);
shape.shp().skip(4*8);
// check if we have an index file around
std::string index_name(shape_name_+".index");
std::ifstream file(index_name.c_str(),std::ios::in | std::ios::binary);
if (file)
{
indexed_=true;
file.close();
}
#ifdef MAPNIK_DEBUG
std::clog << extent_ << std::endl;
std::clog << "file_length=" << file_length_ << std::endl;
std::clog << "shape_type=" << shape_type << std::endl;
#endif
}
int shape_datasource::type() const
{
return type_;
}
layer_descriptor shape_datasource::get_descriptor() const
{
return desc_;
}
std::string shape_datasource::name()
{
return name_;
}
featureset_ptr shape_datasource::features(const query& q) const
{
filter_in_box filter(q.get_bbox());
if (indexed_)
{
return featureset_ptr
(new shape_index_featureset<filter_in_box>(filter,
shape_name_,
q.property_names(),
desc_.get_encoding()));
}
else
{
return featureset_ptr
(new shape_featureset<filter_in_box>(filter,
shape_name_,
q.property_names(),
desc_.get_encoding(),
file_length_));
}
}
featureset_ptr shape_datasource::features_at_point(coord2d const& pt) const
{
filter_at_point filter(pt);
// collect all attribute names
std::vector<attribute_descriptor> const& desc_vector = desc_.get_descriptors();
std::vector<attribute_descriptor>::const_iterator itr = desc_vector.begin();
std::vector<attribute_descriptor>::const_iterator end = desc_vector.end();
std::set<std::string> names;
while (itr != end)
{
names.insert(itr->get_name());
++itr;
}
if (indexed_)
{
return featureset_ptr
(new shape_index_featureset<filter_at_point>(filter,
shape_name_,
names,
desc_.get_encoding()));
}
else
{
return featureset_ptr
(new shape_featureset<filter_at_point>(filter,
shape_name_,
names,
desc_.get_encoding(),
file_length_));
}
}
Envelope<double> shape_datasource::envelope() const
{
return extent_;
}
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