330 lines
9.8 KiB
C++
330 lines
9.8 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) 2007 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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// $Id$
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#include "sqlite_datasource.hpp"
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#include "sqlite_featureset.hpp"
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// mapnik
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#include <mapnik/ptree_helpers.hpp>
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// boost
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#include <boost/algorithm/string.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/tokenizer.hpp>
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using std::clog;
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using std::endl;
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using boost::lexical_cast;
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using boost::bad_lexical_cast;
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(sqlite_datasource)
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using mapnik::Envelope;
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using mapnik::coord2d;
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using mapnik::query;
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using mapnik::featureset_ptr;
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using mapnik::layer_descriptor;
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using mapnik::attribute_descriptor;
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using mapnik::datasource_exception;
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std::string table_from_sql(std::string const& sql)
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{
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std::string table_name = boost::algorithm::to_lower_copy(sql);
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boost::algorithm::replace_all(table_name,"\n"," ");
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std::string::size_type idx = table_name.rfind("from");
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if (idx!=std::string::npos)
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{
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idx=table_name.find_first_not_of(" ",idx+4);
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if (idx != std::string::npos)
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{
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table_name=table_name.substr(idx);
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}
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idx=table_name.find_first_of(" ),");
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if (idx != std::string::npos)
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{
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table_name = table_name.substr(0,idx);
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}
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}
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return table_name;
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}
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sqlite_datasource::sqlite_datasource(parameters const& params)
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: datasource(params),
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extent_(),
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extent_initialized_(false),
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type_(datasource::Vector),
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table_(*params.get<std::string>("table","")),
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metadata_(*params.get<std::string>("metadata","")),
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geometry_field_(*params.get<std::string>("geometry_field","the_geom")),
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key_field_(*params.get<std::string>("key_field","OGC_FID")),
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row_offset_(*params_.get<int>("row_offset",0)),
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row_limit_(*params_.get<int>("row_limit",0)),
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desc_(*params.get<std::string>("type"), *params.get<std::string>("encoding","utf-8")),
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format_(mapnik::wkbGeneric)
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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("missing <file> paramater");
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boost::optional<std::string> wkb = params.get<std::string>("wkb_format");
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if (wkb)
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{
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if (*wkb == "spatialite")
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format_ = mapnik::wkbSpatiaLite;
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}
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multiple_geometries_ = *params_.get<mapnik::boolean>("multiple_geometries",false);
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use_spatial_index_ = *params_.get<mapnik::boolean>("use_spatial_index",true);
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dataset_ = new sqlite_connection (*file);
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boost::optional<std::string> ext = params_.get<std::string>("extent");
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if (ext)
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{
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boost::char_separator<char> sep(",");
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boost::tokenizer<boost::char_separator<char> > tok(*ext,sep);
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unsigned i = 0;
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bool success = false;
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double d[4];
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for (boost::tokenizer<boost::char_separator<char> >::iterator beg=tok.begin();
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beg!=tok.end();++beg)
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{
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try
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{
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d[i] = boost::lexical_cast<double>(*beg);
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}
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catch (boost::bad_lexical_cast & ex)
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{
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std::clog << ex.what() << "\n";
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break;
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}
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if (i==3)
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{
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success = true;
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break;
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}
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++i;
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}
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if (success)
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{
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extent_.init(d[0],d[1],d[2],d[3]);
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extent_initialized_ = true;
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}
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}
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std::string table_name = table_from_sql(table_);
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if (metadata_ != "" && ! extent_initialized_)
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{
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std::ostringstream s;
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s << "select xmin, ymin, xmax, ymax from " << metadata_;
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s << " where lower(f_table_name) = lower('" << table_name << "')";
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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if (rs->is_valid () && rs->step_next())
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{
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double xmin = rs->column_double (0);
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double ymin = rs->column_double (1);
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double xmax = rs->column_double (2);
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double ymax = rs->column_double (3);
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extent_.init (xmin,ymin,xmax,ymax);
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extent_initialized_ = true;
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}
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}
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if (use_spatial_index_)
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{
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std::ostringstream s;
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s << "select count (*) from sqlite_master";
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s << " where lower(name) = lower('idx_" << table_name << "_" << geometry_field_ << "')";
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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if (rs->is_valid () && rs->step_next())
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{
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use_spatial_index_ = rs->column_integer (0) == 1;
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}
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#ifdef MAPNIK_DEBUG
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if (! use_spatial_index_)
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clog << "cannot use the spatial index " << endl;
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#endif
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}
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{
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/*
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XXX - This is problematic, if we don't have at least a row,
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we cannot determine the right columns types and names
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as all column_type are SQLITE_NULL
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*/
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std::ostringstream s;
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s << "select * from " << table_ << " limit 0";
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boost::scoped_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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if (rs->is_valid () && rs->step_next())
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{
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for (int i = 0; i < rs->column_count (); ++i)
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{
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const int type_oid = rs->column_type (i);
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const char* fld_name = rs->column_name (i);
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switch (type_oid)
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{
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case SQLITE_INTEGER:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Integer));
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break;
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case SQLITE_FLOAT:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
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break;
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case SQLITE_TEXT:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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break;
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case SQLITE_NULL:
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case SQLITE_BLOB:
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break;
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default:
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#ifdef MAPNIK_DEBUG
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clog << "unknown type_oid="<<type_oid<<endl;
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#endif
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break;
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}
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}
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}
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}
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}
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sqlite_datasource::~sqlite_datasource()
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{
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delete dataset_;
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}
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std::string const sqlite_datasource::name_="sqlite";
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std::string sqlite_datasource::name()
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{
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return name_;
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}
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int sqlite_datasource::type() const
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{
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return type_;
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}
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Envelope<double> sqlite_datasource::envelope() const
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{
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return extent_;
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}
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layer_descriptor sqlite_datasource::get_descriptor() const
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{
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return desc_;
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}
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featureset_ptr sqlite_datasource::features(query const& q) const
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{
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if (dataset_)
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{
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mapnik::Envelope<double> const& e = q.get_bbox();
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std::ostringstream s;
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s << "select " << geometry_field_ << "," << key_field_;
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std::set<std::string> const& props = q.property_names();
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std::set<std::string>::const_iterator pos = props.begin();
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std::set<std::string>::const_iterator end = props.end();
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while (pos != end)
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{
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s << "," << *pos << "";
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++pos;
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}
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s << " from ";
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std::string query (table_);
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if (use_spatial_index_)
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{
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std::string table_name = table_from_sql(query);
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std::ostringstream spatial_sql;
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spatial_sql << std::setprecision(16);
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spatial_sql << " where rowid in (select pkid from idx_" << table_name << "_" << geometry_field_;
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spatial_sql << " where xmax>=" << e.minx() << " and xmin<=" << e.maxx() ;
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spatial_sql << " and ymax>=" << e.miny() << " and ymin<=" << e.maxy() << ")";
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if (boost::algorithm::ifind_first(query,"where"))
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{
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boost::algorithm::ireplace_first(query, "where", spatial_sql.str() + " and");
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}
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else if (boost::algorithm::find_first(query,table_name))
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{
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boost::algorithm::ireplace_first(query, table_name , table_name + " " + spatial_sql.str());
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}
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}
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s << query ;
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if (row_limit_ > 0) {
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s << " limit " << row_limit_;
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}
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if (row_offset_ > 0) {
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s << " offset " << row_offset_;
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}
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#ifdef MAPNIK_DEBUG
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std::cerr << s.str() << "\n";
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#endif
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boost::shared_ptr<sqlite_resultset> rs (dataset_->execute_query (s.str()));
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return featureset_ptr (new sqlite_featureset(rs, desc_.get_encoding(), format_, multiple_geometries_));
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}
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return featureset_ptr();
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}
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featureset_ptr sqlite_datasource::features_at_point(coord2d const& pt) const
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{
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#if 0
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if (dataset_ && layer_)
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{
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OGRPoint point;
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point.setX (pt.x);
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point.setY (pt.y);
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layer_->SetSpatialFilter (&point);
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return featureset_ptr(new ogr_featureset(*dataset_, *layer_, desc_.get_encoding(), multiple_geometries_));
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}
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#endif
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return featureset_ptr();
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}
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