Merge pull request #912 from mapnik/csv_plugin
New CSV datasource plugin
This commit is contained in:
Dane Springmeyer
commit
c97c4c90bf
6 changed files with 866 additions and 1 deletions
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@ -14,6 +14,8 @@ For a complete change history, see the SVN log.
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Mapnik 2.1.0
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------------
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- New CSV plugin - reads tabular files - autodetecting geo columns, newlines, and delimiters. Uses in-memory featureset for fast rendering and is not designed for large files (#902)
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- Fixed bug in shield line placement when dx/dy are used to shift the label relative to the placement point (Matt Amos) (#908)
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@ -104,6 +104,7 @@ PLUGINS = { # plugins with external dependencies
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'shape': {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
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'csv': {'default':False,'path':None,'inc':None,'lib':None,'lang':'C++'},
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'raster': {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
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'csv': {'default':False,'path':None,'inc':None,'lib':None,'lang':'C++'},
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'kismet': {'default':False,'path':None,'inc':None,'lib':None,'lang':'C++'},
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}
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32
plugins/input/csv/build.py
Normal file
32
plugins/input/csv/build.py
Normal file
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@ -0,0 +1,32 @@
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#!/usr/bin/env python
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import os
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Import ('env')
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PLUGIN_NAME = 'csv'
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install_dest = env['MAPNIK_INPUT_PLUGINS_DEST']
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plugin_env = env.Clone()
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plugin_sources = Split(
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"""
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%(PLUGIN_NAME)s_datasource.cpp
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""" % locals()
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)
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libraries = []
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libraries.append('mapnik2')
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libraries.append(env['ICU_LIB_NAME'])
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TARGET = plugin_env.SharedLibrary(
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'../%s' % PLUGIN_NAME,
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SHLIBPREFIX='',
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SHLIBSUFFIX='.input',
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source=plugin_sources,
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LIBS=libraries,
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LINKFLAGS=env.get('CUSTOM_LDFLAGS')
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)
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if 'uninstall' not in COMMAND_LINE_TARGETS:
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env.Install(install_dest, TARGET)
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env.Alias('install', install_dest)
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784
plugins/input/csv/csv_datasource.cpp
Normal file
784
plugins/input/csv/csv_datasource.cpp
Normal file
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@ -0,0 +1,784 @@
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#include "csv_datasource.hpp"
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// boost
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#include <boost/make_shared.hpp>
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#include <boost/tokenizer.hpp>
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#include <boost/tokenizer.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/algorithm/string.hpp>
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#include <boost/spirit/include/qi.hpp>
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// mapnik
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#include <mapnik/feature_layer_desc.hpp>
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#include <mapnik/feature_factory.hpp>
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#include <mapnik/geometry.hpp>
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#include <mapnik/memory_featureset.hpp>
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#include <mapnik/wkt/wkt_factory.hpp>
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#include <mapnik/ptree_helpers.hpp> // mapnik::boolean
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// stl
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#include <sstream>
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#include <fstream> // fstream
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#include <string>
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#include <iterator> // ostream_operator
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// std lib
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#include <stdio.h>
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#include <stdlib.h>
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using mapnik::datasource;
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using mapnik::parameters;
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using namespace boost::spirit;
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DATASOURCE_PLUGIN(csv_datasource)
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csv_datasource::csv_datasource(parameters const& params, bool bind)
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: datasource(params),
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desc_(*params_.get<std::string>("type"), *params_.get<std::string>("encoding","utf-8")),
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extent_(),
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filename_(),
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inline_string_(),
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file_length_(0),
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row_limit_(*params_.get<int>("row_limit",0)),
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features_(),
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escape_(*params_.get<std::string>("escape","")),
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separator_(*params_.get<std::string>("separator","")),
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quote_(*params_.get<std::string>("quote","")),
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headers_(),
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manual_headers_(boost::trim_copy(*params_.get<std::string>("headers",""))),
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strict_(*params_.get<mapnik::boolean>("strict",false)),
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quiet_(*params_.get<mapnik::boolean>("quiet",false)),
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filesize_max_(*params_.get<float>("filesize_max",20.0)) // MB
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{
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/* TODO:
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general:
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- refactor parser into generic class
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- tests
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alternate large file pipeline:
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- stat file, detect > 15 MB
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- build up csv line-by-line iterator
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- creates opportunity to filter attributes by map query
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speed:
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- add properties for wkt/lon/lat at parse time
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- remove boost::lexical_cast
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- add ability to pass 'filter' keyword to drop attributes at layer init
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- create quad tree on the fly for small/med size files
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- memory map large files for reading
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- smaller features (less memory overhead)
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usability:
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- enforce column names without leading digit
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- better error messages (add filepath) if not reading from string
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- move to spirit to tokenize and add character level error feedback:
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http://boost-spirit.com/home/articles/qi-example/tracking-the-input-position-while-parsing/
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*/
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boost::optional<std::string> inline_string = params_.get<std::string>("inline");
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if (inline_string)
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{
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inline_string_ = *inline_string;
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}
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else
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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 mapnik::datasource_exception("CSV 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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filename_ = *base + "/" + *file;
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else
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filename_ = *file;
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}
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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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csv_datasource::~csv_datasource() { }
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void csv_datasource::bind() const
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{
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if (is_bound_) return;
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if (!inline_string_.empty())
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{
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std::istringstream in(inline_string_);
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parse_csv(in,escape_, separator_, quote_);
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}
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else
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{
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std::ifstream in(filename_.c_str(),std::ios_base::in | std::ios_base::binary);
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if (!in.is_open())
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throw mapnik::datasource_exception("CSV Plugin: could not open: '" + filename_ + "'");
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parse_csv(in,escape_, separator_, quote_);
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in.close();
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}
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is_bound_ = true;
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}
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template <typename T>
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void csv_datasource::parse_csv(T& stream,
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std::string const& escape,
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std::string const& separator,
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std::string const& quote) const
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{
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if (filesize_max_ > 0)
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{
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stream.seekg (0, std::ios::end);
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int file_length_ = stream.tellg();
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double file_mb = static_cast<double>(file_length_)/1048576;
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// throw if this is an unreasonably large file to read into memory
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if (file_mb > filesize_max_)
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{
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std::ostringstream s;
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s << "CSV Plugin: csv file is greater than " << filesize_max_ << "MB "
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<< " - you should use a more efficient data format like sqlite, postgis or a shapefile "
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<< " to render this data (set 'filesize_max=0' to disable this restriction if you have lots of memory)";
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throw mapnik::datasource_exception(s.str());
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}
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// set back to start
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stream.seekg (0, std::ios::beg);
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}
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char newline;
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std::string csv_line;
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// autodetect newlines
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bool found_break = false;
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if (std::getline(stream,csv_line,'\n'))
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{
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found_break = true;
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newline = '\n';
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}
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else if (std::getline(stream,csv_line,'\r'))
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{
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found_break = true;
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newline = '\r';
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}
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else
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{
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throw mapnik::datasource_exception("CSV Plugin: could not detect any line breaks in this csv (http://en.wikipedia.org/wiki/Newline)\n");
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}
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// set back to start
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stream.seekg (0, std::ios::beg);
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// if user has not passed separator manuall
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// then attempt to detect by reading first line
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std::string sep = boost::trim_copy(separator);
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if (sep.empty())
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{
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// default to ','
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sep = ",";
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// detect tabs
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int num_tabs = std::count(csv_line.begin(), csv_line.end(), '\t');
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if (num_tabs > 0)
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{
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int num_commas = std::count(csv_line.begin(), csv_line.end(), ',');
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if (num_tabs > num_commas)
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{
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sep = "\t";
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#ifdef MAPNIK_DEBUG
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std::clog << "CSV Plugin: auto detected tab separator\n";
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#endif
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}
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}
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}
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typedef boost::escaped_list_separator<char> escape_type;
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std::string esc = boost::trim_copy(escape);
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if (esc.empty()) esc = "\\";
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std::string quo = boost::trim_copy(quote);
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if (quo.empty()) quo = "\"";
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#ifdef MAPNIK_DEBUG
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std::clog << "CSV Plugin: csv grammer: sep: '" << sep << "' quo: '" << quo << "' esc: '" << esc << "'\n";
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#endif
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boost::escaped_list_separator<char> grammer;
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try
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{
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//grammer = boost::escaped_list_separator<char>('\\', ',', '\"');
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grammer = boost::escaped_list_separator<char>(esc, sep, quo);
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}
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catch (const std::exception & ex )
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{
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std::ostringstream s;
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s << "CSV Plugin: " << ex.what();
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throw mapnik::datasource_exception(s.str());
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}
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typedef boost::tokenizer< escape_type > Tokenizer;
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int line_number(1);
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bool has_wkt_field = false;
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bool has_lat_field = false;
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bool has_lon_field = false;
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unsigned wkt_idx;
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unsigned lat_idx;
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unsigned lon_idx;
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if (!manual_headers_.empty())
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{
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Tokenizer tok(manual_headers_, grammer);
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Tokenizer::iterator beg = tok.begin();
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unsigned idx(0);
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for (; beg != tok.end(); ++beg)
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{
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std::string val = boost::trim_copy(*beg);
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std::string lower_val = boost::algorithm::to_lower_copy(val);
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if (lower_val == "wkt")
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{
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wkt_idx = idx;
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has_wkt_field = true;
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}
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if (lower_val == "x" || (lower_val.find("longitude") != std::string::npos))
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{
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lon_idx = idx;
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has_lon_field = true;
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}
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if (lower_val == "y" || (lower_val.find("latitude") != std::string::npos))
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{
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lat_idx = idx;
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has_lat_field = true;
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}
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++idx;
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headers_.push_back(val);
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}
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}
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else // parse first line as headers
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{
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while (std::getline(stream,csv_line,newline))
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{
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try
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{
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Tokenizer tok(csv_line, grammer);
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Tokenizer::iterator beg = tok.begin();
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std::string val = boost::trim_copy(*beg);
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// skip blank lines
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if (val.empty())
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{
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// do nothing
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++line_number;
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}
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else
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{
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int idx = -1;
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for (; beg != tok.end(); ++beg)
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{
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++idx;
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val = boost::trim_copy(*beg);
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if (val.empty())
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{
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std::ostringstream s;
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s << "CSV Plugin: expected a column header at line "
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<< line_number << ", column " << idx
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<< " - ensure this row contains valid header fields: '"
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<< csv_line << "'\n";
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throw mapnik::datasource_exception(s.str());
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}
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else
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{
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std::string lower_val = boost::algorithm::to_lower_copy(val);
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if (lower_val == "wkt")
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{
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wkt_idx = idx;
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has_wkt_field = true;
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}
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if (lower_val == "x" || (lower_val.find("longitude") != std::string::npos))
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{
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lon_idx = idx;
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has_lon_field = true;
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}
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if (lower_val == "y" || (lower_val.find("latitude") != std::string::npos))
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{
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lat_idx = idx;
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has_lat_field = true;
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}
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headers_.push_back(val);
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}
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}
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++line_number;
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break;
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}
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}
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catch (const std::exception & ex )
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{
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std::ostringstream s;
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s << "CSV Plugin: error parsing headers: " << ex.what();
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throw mapnik::datasource_exception(s.str());
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}
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}
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}
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if (!has_wkt_field && (!has_lon_field || !has_lat_field) )
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{
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std::ostringstream s;
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s << "CSV Plugin: could not detect column headers with the name of 'wkt' or lat/lon - this is required for reading geometry data";
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throw mapnik::datasource_exception(s.str());
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}
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int feature_count(0);
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bool extent_initialized = false;
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int num_headers = headers_.size();
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mapnik::transcoder tr(desc_.get_encoding());
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while (std::getline(stream,csv_line,newline))
|
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{
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if ((row_limit_ > 0) && (line_number > row_limit_))
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "CSV Plugin: row limit hit, exiting at feature: " << feature_count << "\n";
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#endif
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break;
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}
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// skip blank lines
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if (csv_line.empty()){
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++line_number;
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continue;
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#ifdef MAPNIK_DEBUG
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std::clog << "CSV Plugin: empty row encountered at line: " << line_number << "\n";
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#endif
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}
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||||
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try
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{
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Tokenizer tok(csv_line, grammer);
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Tokenizer::iterator beg = tok.begin();
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// early return for strict mode
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if (strict_)
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{
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int num_fields = std::distance(beg,tok.end());
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if (num_fields != num_headers)
|
||||
{
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std::ostringstream s;
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s << "CSV Plugin: # of headers != # of values parsed for row " << line_number << "\n";
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throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
}
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||||
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mapnik::feature_ptr feature(mapnik::feature_factory::create(feature_count));
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double x(0);
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double y(0);
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bool parsed_x = false;
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bool parsed_y = false;
|
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bool parsed_wkt = false;
|
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bool first_feature = true;
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bool skip = false;
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||||
bool null_geom = false;
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std::vector<std::string> collected;
|
||||
|
||||
int i = -1;
|
||||
for (;beg != tok.end(); ++beg)
|
||||
{
|
||||
++i;
|
||||
std::string value = boost::trim_copy(*beg);
|
||||
|
||||
// avoid range error if trailing separator
|
||||
if (i >= num_headers)
|
||||
{
|
||||
#ifdef MAPNIK_DEBUG
|
||||
std::clog << "CSV Plugin: messed up line encountered where # values > # column headers at: " << line_number << "\n";
|
||||
#endif
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skip = true;
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||||
break;
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}
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std::string fld_name(headers_.at(i));
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collected.push_back(fld_name);
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int value_length = value.length();
|
||||
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// parse wkt
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||||
if (has_wkt_field)
|
||||
{
|
||||
if (i == wkt_idx)
|
||||
{
|
||||
// skip empty geoms
|
||||
if (value.empty())
|
||||
{
|
||||
null_geom = true;
|
||||
break;
|
||||
}
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||||
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||||
// optimize simple "POINT (x y)"
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||||
// using this shaved 2 seconds off csv that took 8 seconds total to parse
|
||||
if (value.find("POINT") == 0)
|
||||
{
|
||||
using boost::phoenix::ref;
|
||||
using boost::spirit::qi::_1;
|
||||
std::string::const_iterator str_beg = value.begin();
|
||||
std::string::const_iterator str_end = value.end();
|
||||
bool r = qi::phrase_parse(str_beg,str_end,
|
||||
(
|
||||
qi::lit("POINT") >> '(' >> double_[ref(x) = _1] >> double_[ref(y) = _1] >> ')'
|
||||
),
|
||||
ascii::space);
|
||||
|
||||
if (r /*&& (str_beg != str_end)*/)
|
||||
{
|
||||
mapnik::geometry_type * pt = new mapnik::geometry_type(mapnik::Point);
|
||||
pt->move_to(x,y);
|
||||
feature->add_geometry(pt);
|
||||
parsed_wkt = true;
|
||||
}
|
||||
else
|
||||
{
|
||||
std::clog << "could not parse: " << value << "\n";
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (mapnik::from_wkt(value, feature->paths()))
|
||||
{
|
||||
parsed_wkt = true;
|
||||
}
|
||||
else
|
||||
{
|
||||
std::ostringstream s;
|
||||
s << "CSV Plugin: expected well known text geometry: could not parse row "
|
||||
<< line_number
|
||||
<< ",column "
|
||||
<< i << " - found: '"
|
||||
<< value << "'";
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// longitude
|
||||
if (i == lon_idx)
|
||||
{
|
||||
// skip empty geoms
|
||||
if (value.empty())
|
||||
{
|
||||
null_geom = true;
|
||||
break;
|
||||
}
|
||||
|
||||
try
|
||||
{
|
||||
x = boost::lexical_cast<double>(value);
|
||||
parsed_x = true;
|
||||
}
|
||||
catch (boost::bad_lexical_cast & ex)
|
||||
{
|
||||
std::ostringstream s;
|
||||
s << "CSV Plugin: expected a float value for longitude: could not parse row "
|
||||
<< line_number
|
||||
<< ", column "
|
||||
<< i << " - found: '"
|
||||
<< value << "'";
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
// latitude
|
||||
else if (i == lat_idx)
|
||||
{
|
||||
// skip empty geoms
|
||||
if (value.empty())
|
||||
{
|
||||
null_geom = true;
|
||||
break;
|
||||
}
|
||||
|
||||
try
|
||||
{
|
||||
y = boost::lexical_cast<double>(value);
|
||||
parsed_y = true;
|
||||
}
|
||||
catch (boost::bad_lexical_cast & ex)
|
||||
{
|
||||
std::ostringstream s;
|
||||
s << "CSV Plugin: expected a float value for latitude: could not parse row "
|
||||
<< line_number
|
||||
<< ", column "
|
||||
<< i << " - found: '"
|
||||
<< value << "'";
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// add all values as attributes
|
||||
if (value.empty())
|
||||
{
|
||||
boost::put(*feature,fld_name,mapnik::value_null());
|
||||
}
|
||||
// only true strings are this long
|
||||
else if (value_length > 20)
|
||||
{
|
||||
UnicodeString ustr = tr.transcode(value.c_str());
|
||||
boost::put(*feature,fld_name,ustr);
|
||||
if (first_feature)
|
||||
desc_.add_descriptor(mapnik::attribute_descriptor(fld_name,mapnik::String));
|
||||
|
||||
}
|
||||
else if ((value[0] >= '0' && value[0] <= '9') || value[0] == '-')
|
||||
{
|
||||
double float_val = 0.0;
|
||||
std::string::const_iterator str_beg = value.begin();
|
||||
std::string::const_iterator str_end = value.end();
|
||||
bool r = qi::phrase_parse(str_beg,str_end,qi::double_,ascii::space,float_val);
|
||||
if (r)
|
||||
{
|
||||
if (value.find(".") != std::string::npos)
|
||||
{
|
||||
boost::put(*feature,fld_name,float_val);
|
||||
if (first_feature)
|
||||
desc_.add_descriptor(mapnik::attribute_descriptor(fld_name,mapnik::Double));
|
||||
}
|
||||
else
|
||||
{
|
||||
int val = static_cast<int>(float_val);
|
||||
boost::put(*feature,fld_name,val);
|
||||
if (first_feature)
|
||||
desc_.add_descriptor(mapnik::attribute_descriptor(fld_name,mapnik::Integer));
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// fallback to normal string
|
||||
UnicodeString ustr = tr.transcode(value.c_str());
|
||||
boost::put(*feature,fld_name,ustr);
|
||||
if (first_feature)
|
||||
desc_.add_descriptor(mapnik::attribute_descriptor(fld_name,mapnik::String));
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (value == "true")
|
||||
{
|
||||
boost::put(*feature,fld_name,true);
|
||||
if (first_feature)
|
||||
desc_.add_descriptor(mapnik::attribute_descriptor(fld_name,mapnik::Boolean));
|
||||
}
|
||||
else if(value == "false")
|
||||
{
|
||||
boost::put(*feature,fld_name,false);
|
||||
if (first_feature)
|
||||
desc_.add_descriptor(mapnik::attribute_descriptor(fld_name,mapnik::Boolean));
|
||||
}
|
||||
else
|
||||
{
|
||||
// fallback to normal string
|
||||
UnicodeString ustr = tr.transcode(value.c_str());
|
||||
boost::put(*feature,fld_name,ustr);
|
||||
if (first_feature)
|
||||
desc_.add_descriptor(mapnik::attribute_descriptor(fld_name,mapnik::String));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
first_feature = false;
|
||||
|
||||
if (skip)
|
||||
{
|
||||
++line_number;
|
||||
std::ostringstream s;
|
||||
s << "CSV Plugin: # values > # column headers"
|
||||
<< "for line " << line_number << " - found " << headers_.size()
|
||||
<< " with values like: " << csv_line << "\n";
|
||||
//<< "for: " << boost::algorithm::join(collected, ",") << "\n";
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
continue;
|
||||
}
|
||||
}
|
||||
else if (null_geom)
|
||||
{
|
||||
++line_number;
|
||||
std::ostringstream s;
|
||||
s << "CSV Plugin: null geometry encountered for line "
|
||||
<< line_number;
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
if (has_wkt_field)
|
||||
{
|
||||
if (parsed_wkt)
|
||||
{
|
||||
if (!extent_initialized)
|
||||
{
|
||||
extent_initialized = true;
|
||||
extent_ = feature->envelope();
|
||||
}
|
||||
else
|
||||
{
|
||||
extent_.expand_to_include(feature->envelope());
|
||||
}
|
||||
features_.push_back(feature);
|
||||
}
|
||||
else
|
||||
{
|
||||
std::ostringstream s;
|
||||
s << "CSV Plugin: could not read WKT geometry "
|
||||
<< "for line " << line_number << " - found " << headers_.size()
|
||||
<< " with values like: " << csv_line << "\n";
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if (parsed_x && parsed_y)
|
||||
{
|
||||
mapnik::geometry_type * pt = new mapnik::geometry_type(mapnik::Point);
|
||||
pt->move_to(x,y);
|
||||
feature->add_geometry(pt);
|
||||
features_.push_back(feature);
|
||||
++feature_count;
|
||||
|
||||
if (!extent_initialized)
|
||||
{
|
||||
extent_initialized = true;
|
||||
extent_ = feature->envelope();
|
||||
|
||||
}
|
||||
else
|
||||
{
|
||||
extent_.expand_to_include(feature->envelope());
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
std::ostringstream s;
|
||||
if (!parsed_x)
|
||||
{
|
||||
s << "CSV Plugin: does your csv have valid headers?\n"
|
||||
<< "Could not detect or parse any rows named 'x' or 'longitude' "
|
||||
<< "for line " << line_number << " but found " << headers_.size()
|
||||
<< " with values like: " << csv_line << "\n"
|
||||
<< "for: " << boost::algorithm::join(collected, ",") << "\n";
|
||||
}
|
||||
if (!parsed_y)
|
||||
{
|
||||
s << "CSV Plugin: does your csv have valid headers?\n"
|
||||
<< "Could not detect or parse any rows named 'y' or 'latitude' "
|
||||
<< "for line " << line_number << " but found " << headers_.size()
|
||||
<< " with values like: " << csv_line << "\n"
|
||||
<< "for: " << boost::algorithm::join(collected, ",") << "\n";
|
||||
}
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
++line_number;
|
||||
}
|
||||
catch (const std::exception & ex )
|
||||
{
|
||||
std::ostringstream s;
|
||||
s << "CSV Plugin: unexpected error parsing line: " << line_number
|
||||
<< " - found " << headers_.size() << " with values like: " << csv_line << "\n"
|
||||
<< " and got error like: " << ex.what();
|
||||
if (strict_)
|
||||
{
|
||||
throw mapnik::datasource_exception(s.str());
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!quiet_) std::clog << s.str() << "\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
std::string csv_datasource::name()
|
||||
{
|
||||
return "csv";
|
||||
}
|
||||
|
||||
int csv_datasource::type() const
|
||||
{
|
||||
return datasource::Vector;
|
||||
}
|
||||
|
||||
mapnik::box2d<double> csv_datasource::envelope() const
|
||||
{
|
||||
if (!is_bound_) bind();
|
||||
|
||||
return extent_;
|
||||
}
|
||||
|
||||
mapnik::layer_descriptor csv_datasource::get_descriptor() const
|
||||
{
|
||||
if (!is_bound_) bind();
|
||||
|
||||
return desc_;
|
||||
}
|
||||
|
||||
mapnik::featureset_ptr csv_datasource::features(mapnik::query const& q) const
|
||||
{
|
||||
if (!is_bound_) bind();
|
||||
|
||||
// TODO - should we check q.property_names() and throw if not found in headers_?
|
||||
//const std::set<std::string>& attribute_names = q.property_names();
|
||||
|
||||
return boost::make_shared<mapnik::memory_featureset>(q.get_bbox(),features_);
|
||||
}
|
||||
|
||||
mapnik::featureset_ptr csv_datasource::features_at_point(mapnik::coord2d const& pt) const
|
||||
{
|
||||
if (!is_bound_) bind();
|
||||
|
||||
throw mapnik::datasource_exception("CSV Plugin: features_at_point is not supported yet");
|
||||
}
|
||||
46
plugins/input/csv/csv_datasource.hpp
Normal file
46
plugins/input/csv/csv_datasource.hpp
Normal file
|
|
@ -0,0 +1,46 @@
|
|||
#ifndef MAPNIK_CSV_DATASOURCE_HPP
|
||||
#define MAPNIK_CSV_DATASOURCE_HPP
|
||||
|
||||
// mapnik
|
||||
#include <mapnik/datasource.hpp>
|
||||
|
||||
// stl
|
||||
#include <vector>
|
||||
|
||||
class csv_datasource : public mapnik::datasource
|
||||
{
|
||||
public:
|
||||
csv_datasource(mapnik::parameters const& params, bool bind=true);
|
||||
virtual ~csv_datasource ();
|
||||
int type() const;
|
||||
static std::string name();
|
||||
mapnik::featureset_ptr features(mapnik::query const& q) const;
|
||||
mapnik::featureset_ptr features_at_point(mapnik::coord2d const& pt) const;
|
||||
mapnik::box2d<double> envelope() const;
|
||||
mapnik::layer_descriptor get_descriptor() const;
|
||||
void bind() const;
|
||||
template <typename T>
|
||||
void parse_csv(T& stream,
|
||||
std::string const& escape,
|
||||
std::string const& separator,
|
||||
std::string const& quote) const;
|
||||
private:
|
||||
mutable mapnik::layer_descriptor desc_;
|
||||
mutable mapnik::box2d<double> extent_;
|
||||
mutable std::string filename_;
|
||||
mutable std::string inline_string_;
|
||||
mutable int file_length_;
|
||||
mutable int row_limit_;
|
||||
mutable std::vector<mapnik::feature_ptr> features_;
|
||||
mutable std::string escape_;
|
||||
mutable std::string separator_;
|
||||
mutable std::string quote_;
|
||||
mutable std::vector<std::string> headers_;
|
||||
mutable std::string manual_headers_;
|
||||
mutable bool strict_;
|
||||
mutable bool quiet_;
|
||||
mutable double filesize_max_;
|
||||
};
|
||||
|
||||
|
||||
#endif // MAPNIK_CSV_DATASOURCE_HPP
|
||||
|
|
@ -8,7 +8,7 @@
|
|||
|
||||
<Layer name="lay" srs="+proj=longlat +ellps=airy +datum=OSGB36 +no_defs">
|
||||
<StyleName>test</StyleName>
|
||||
<Datasource base="shp">
|
||||
<Datasource>
|
||||
<Parameter name="type">shape</Parameter>
|
||||
<Parameter name="file">../../data/shp/poly.shp</Parameter>
|
||||
</Datasource>
|
||||
|
|
|
|||
Loading…
Reference in a new issue