304 lines
9.3 KiB
C++
304 lines
9.3 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2006 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/geom_util.hpp>
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// boost
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#include <boost/version.hpp>
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#include <boost/format.hpp>
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#include <boost/algorithm/string.hpp>
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#include <boost/filesystem/operations.hpp>
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#include <boost/make_shared.hpp>
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// stl
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#include <iostream>
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#include <fstream>
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#include <stdexcept>
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#include "shape_datasource.hpp"
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#include "shape_featureset.hpp"
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#include "shape_index_featureset.hpp"
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DATASOURCE_PLUGIN(shape_datasource)
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using mapnik::String;
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using mapnik::Double;
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using mapnik::Integer;
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using mapnik::datasource_exception;
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using mapnik::filter_in_box;
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using mapnik::filter_at_point;
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using mapnik::attribute_descriptor;
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shape_datasource::shape_datasource(const parameters ¶ms, bool bind)
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: datasource (params),
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type_(datasource::Vector),
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file_length_(0),
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indexed_(false),
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desc_(*params.get<std::string>("type"), *params.get<std::string>("encoding","utf-8"))
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{
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boost::optional<std::string> file = params.get<std::string>("file");
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if (!file) throw datasource_exception("Shape Plugin: missing <file> parameter");
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boost::optional<std::string> base = params.get<std::string>("base");
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if (base)
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shape_name_ = *base + "/" + *file;
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else
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shape_name_ = *file;
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boost::algorithm::ireplace_last(shape_name_,".shp","");
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if (bind)
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{
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this->bind();
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}
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}
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void shape_datasource::bind() const
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{
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if (is_bound_) return;
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if (!boost::filesystem::exists(shape_name_ + ".shp"))
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{
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throw datasource_exception("Shape Plugin: shapefile '" + shape_name_ + ".shp' does not exist");
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}
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if (boost::filesystem::is_directory(shape_name_ + ".shp"))
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{
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throw datasource_exception("Shape Plugin: shapefile '" + shape_name_ + ".shp' appears to be a directory not a file");
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}
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if (!boost::filesystem::exists(shape_name_ + ".dbf"))
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{
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throw datasource_exception("Shape Plugin: shapefile '" + shape_name_ + ".dbf' does not exist");
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}
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try
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{
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boost::shared_ptr<shape_io> shape_ref = boost::make_shared<shape_io>(shape_name_);
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init(*shape_ref);
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for (int i=0;i<shape_ref->dbf().num_fields();++i)
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{
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field_descriptor const& fd=shape_ref->dbf().descriptor(i);
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std::string fld_name=fd.name_;
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switch (fd.type_)
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{
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case 'C':
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case 'D':
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case 'M':
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case 'L':
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desc_.add_descriptor(attribute_descriptor(fld_name, String));
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break;
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case 'N':
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case 'F':
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{
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if (fd.dec_>0)
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{
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desc_.add_descriptor(attribute_descriptor(fld_name,Double,false,8));
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}
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else
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{
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desc_.add_descriptor(attribute_descriptor(fld_name,Integer,false,4));
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}
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break;
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}
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default:
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#ifdef MAPNIK_DEBUG
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std::clog << "Shape Plugin: unknown type " << fd.type_ << std::endl;
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#endif
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break;
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}
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}
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// for indexed shapefiles we keep open the file descriptor for fast reads
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if (indexed_) {
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shape_ = shape_ref;
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}
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}
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catch (const datasource_exception& ex)
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{
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std::clog << "Shape Plugin: error processing field attributes, " << ex.what() << std::endl;
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throw;
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}
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catch (const std::exception& ex)
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{
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std::clog << "Shape Plugin: error processing field attributes, " << ex.what() << std::endl;
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throw;
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}
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catch (...) // exception: pipe_select_interrupter: Too many open files
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{
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std::clog << "Shape Plugin: error processing field attributes" << std::endl;
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throw;
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}
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is_bound_ = true;
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}
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shape_datasource::~shape_datasource() {}
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void shape_datasource::init(shape_io& shape) const
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{
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//first read header from *.shp
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int file_code=shape.shp().read_xdr_integer();
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if (file_code!=9994)
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{
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//invalid file code
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throw datasource_exception("Shape Plugin: " + (boost::format("wrong file code : %d") % file_code).str());
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}
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shape.shp().skip(5*4);
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file_length_=shape.shp().read_xdr_integer();
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int version=shape.shp().read_ndr_integer();
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if (version!=1000)
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{
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//invalid version number
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throw datasource_exception("Shape Plugin: " + (boost::format("invalid version number: %d") % version).str());
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}
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int shape_type = shape.shp().read_ndr_integer();
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if (shape_type == shape_io::shape_multipatch)
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throw datasource_exception("Shape Plugin: shapefile multipatch type is not supported");
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shape.shp().read_envelope(extent_);
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#ifdef MAPNIK_DEBUG
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double zmin = shape.shp().read_double();
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double zmax = shape.shp().read_double();
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double mmin = shape.shp().read_double();
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double mmax = shape.shp().read_double();
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std::clog << "Shape Plugin: Z min/max " << zmin << "," << zmax << std::endl;
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std::clog << "Shape Plugin: M min/max " << mmin << "," << mmax << "\n";
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#else
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shape.shp().skip(4*8);
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#endif
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// check if we have an index file around
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indexed_ = shape.has_index();
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//std::string index_name(shape_name_+".index");
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//std::ifstream file(index_name.c_str(),std::ios::in | std::ios::binary);
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//if (file)
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//{
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// indexed_=true;
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// file.close();
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//}
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//else
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//{
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// std::clog << "### Notice: no .index file found for " + shape_name_ + ".shp, use the 'shapeindex' program to build an index for faster rendering\n";
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//}
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#ifdef MAPNIK_DEBUG
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std::clog << "Shape Plugin: extent=" << extent_ << std::endl;
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std::clog << "Shape Plugin: file_length=" << file_length_ << std::endl;
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std::clog << "Shape Plugin: shape_type=" << shape_type << std::endl;
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#endif
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}
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std::string shape_datasource::name()
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{
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return "shape";
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}
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int shape_datasource::type() const
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{
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return type_;
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}
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layer_descriptor shape_datasource::get_descriptor() const
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{
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if (!is_bound_) bind();
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return desc_;
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}
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featureset_ptr shape_datasource::features(const query& q) const
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{
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if (!is_bound_) bind();
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filter_in_box filter(q.get_bbox());
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if (indexed_)
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{
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shape_->shp().seek(0);
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// TODO - use boost::make_shared - #760
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return featureset_ptr
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(new shape_index_featureset<filter_in_box>(filter,
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*shape_,
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q.property_names(),
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desc_.get_encoding()));
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}
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else
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{
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return boost::make_shared<shape_featureset<filter_in_box> >(filter,
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shape_name_,
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q.property_names(),
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desc_.get_encoding(),
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file_length_);
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}
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}
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featureset_ptr shape_datasource::features_at_point(coord2d const& pt) const
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{
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if (!is_bound_) bind();
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filter_at_point filter(pt);
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// collect all attribute names
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std::vector<attribute_descriptor> const& desc_vector = desc_.get_descriptors();
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std::vector<attribute_descriptor>::const_iterator itr = desc_vector.begin();
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std::vector<attribute_descriptor>::const_iterator end = desc_vector.end();
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std::set<std::string> names;
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while (itr != end)
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{
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names.insert(itr->get_name());
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++itr;
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}
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if (indexed_)
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{
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shape_->shp().seek(0);
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// TODO - use boost::make_shared - #760
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return featureset_ptr
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(new shape_index_featureset<filter_at_point>(filter,
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*shape_,
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names,
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desc_.get_encoding()));
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}
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else
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{
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return boost::make_shared<shape_featureset<filter_at_point> >(filter,
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shape_name_,
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names,
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desc_.get_encoding(),
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file_length_);
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}
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}
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box2d<double> shape_datasource::envelope() const
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{
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if (!is_bound_) bind();
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return extent_;
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}
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