293 lines
9 KiB
C++
293 lines
9 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 <iostream>
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#include <fstream>
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#include <stdexcept>
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#include "ogr_datasource.hpp"
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#include "ogr_featureset.hpp"
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#include "ogr_index_featureset.hpp"
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// mapnik
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#include <mapnik/ptree_helpers.hpp>
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#include <mapnik/geom_util.hpp>
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// boost
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#include <boost/algorithm/string.hpp>
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using std::clog;
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using std::endl;
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(ogr_datasource)
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using mapnik::box2d;
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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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using mapnik::filter_in_box;
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using mapnik::filter_at_point;
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ogr_datasource::ogr_datasource(parameters const& params)
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: datasource(params),
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extent_(),
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type_(datasource::Vector),
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desc_(*params.get<std::string>("type"), *params.get<std::string>("encoding","utf-8")),
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indexed_(false)
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{
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OGRRegisterAll();
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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> parameter");
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multiple_geometries_ = *params_.get<mapnik::boolean>("multiple_geometries",false);
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boost::optional<std::string> base = params.get<std::string>("base");
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if (base)
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dataset_name_ = *base + "/" + *file;
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else
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dataset_name_ = *file;
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// open ogr driver
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dataset_ = OGRSFDriverRegistrar::Open ((dataset_name_).c_str(), FALSE);
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if (!dataset_)
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{
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std::string err = CPLGetLastErrorMsg();
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if( err.size() == 0 ) {
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throw datasource_exception("Connection failed: " + dataset_name_ + " was not found or is not a supported format");
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} else {
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throw datasource_exception(err);
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}
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}
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// initialize layer
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boost::optional<std::string> layer = params.get<std::string>("layer");
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if (!layer)
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{
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std::string s ("missing <layer> parameter, available layers are: ");
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unsigned num_layers = dataset_->GetLayerCount();
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for (unsigned i = 0; i < num_layers; ++i )
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{
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OGRLayer *ogr_layer = dataset_->GetLayer(i);
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OGRFeatureDefn* def = ogr_layer->GetLayerDefn();
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if (def != 0) {
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s += " '";
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s += def->GetName();
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s += "' ";
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} else {
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s += "No layers found!";
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}
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}
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throw datasource_exception(s);
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}
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layerName_ = *layer;
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layer_ = dataset_->GetLayerByName (layerName_.c_str());
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if (! layer_) throw datasource_exception("cannot find <layer> in dataset");
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// initialize envelope
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OGREnvelope envelope;
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layer_->GetExtent (&envelope);
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extent_.init (envelope.MinX, envelope.MinY, envelope.MaxX, envelope.MaxY);
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// scan for index file
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size_t breakpoint = dataset_name_.find_last_of (".");
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if (breakpoint == std::string::npos) breakpoint = dataset_name_.length();
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index_name_ = dataset_name_.substr(0, breakpoint) + ".index";
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std::ifstream index_file (index_name_.c_str(), std::ios::in | std::ios::binary);
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if (index_file)
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{
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indexed_=true;
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index_file.close();
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}
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// deal with attributes descriptions
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OGRFeatureDefn* def = layer_->GetLayerDefn ();
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if (def != 0)
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{
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int fld_count = def->GetFieldCount ();
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for (int i = 0; i < fld_count; i++)
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{
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OGRFieldDefn* fld = def->GetFieldDefn (i);
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std::string fld_name = fld->GetNameRef ();
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OGRFieldType type_oid = fld->GetType ();
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switch (type_oid)
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{
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case OFTInteger:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Integer));
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break;
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case OFTReal:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
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break;
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case OFTString:
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case OFTWideString: // deprecated
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::String));
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break;
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case OFTBinary:
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Object));
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break;
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case OFTIntegerList:
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case OFTRealList:
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case OFTStringList:
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case OFTWideStringList: // deprecated !
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#ifdef MAPNIK_DEBUG
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clog << "unhandled type_oid=" << type_oid << endl;
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#endif
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break;
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case OFTDate:
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case OFTTime:
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case OFTDateTime: // unhandled !
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#ifdef MAPNIK_DEBUG
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clog << "unhandled type_oid=" << type_oid << endl;
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#endif
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desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Object));
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break;
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default: // unknown
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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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ogr_datasource::~ogr_datasource()
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{
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OGRDataSource::DestroyDataSource (dataset_);
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}
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std::string ogr_datasource::name()
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{
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return "ogr";
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}
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int ogr_datasource::type() const
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{
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return type_;
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}
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box2d<double> ogr_datasource::envelope() const
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{
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return extent_;
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}
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layer_descriptor ogr_datasource::get_descriptor() const
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{
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return desc_;
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}
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featureset_ptr ogr_datasource::features(query const& q) const
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{
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if (dataset_ && layer_)
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{
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#if 0
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std::ostringstream s;
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s << "select ";
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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 " << layerName_ ;
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// execute existing SQL
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OGRLayer* layer = dataset_->ExecuteSQL (s.str(), poly);
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// layer must be freed
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dataset_->ReleaseResultSet (layer);
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#endif
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if (indexed_)
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{
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filter_in_box filter(q.get_bbox());
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return featureset_ptr(new ogr_index_featureset<filter_in_box> (*dataset_,
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*layer_,
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filter,
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index_name_,
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desc_.get_encoding(),
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multiple_geometries_));
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}
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else
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{
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return featureset_ptr(new ogr_featureset (*dataset_,
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*layer_,
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q.get_bbox(),
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desc_.get_encoding(),
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multiple_geometries_));
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}
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}
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return featureset_ptr();
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}
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featureset_ptr ogr_datasource::features_at_point(coord2d const& pt) const
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{
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if (dataset_ && layer_)
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{
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if (indexed_)
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{
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filter_at_point filter(pt);
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return featureset_ptr(new ogr_index_featureset<filter_at_point> (*dataset_,
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*layer_,
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filter,
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index_name_,
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desc_.get_encoding(),
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multiple_geometries_));
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}
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else
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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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return featureset_ptr(new ogr_featureset (*dataset_,
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*layer_,
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point,
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desc_.get_encoding(),
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multiple_geometries_));
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}
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}
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return featureset_ptr();
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}
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