155 lines
4.8 KiB
C++
155 lines
4.8 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) 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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//$Id: datasource_cache.cpp 23 2005-03-22 22:16:34Z pavlenko $
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// mapnik
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#include <mapnik/datasource_cache.hpp>
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#include <mapnik/config_error.hpp>
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// boost
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#include <boost/filesystem/operations.hpp>
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#include <boost/algorithm/string.hpp>
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// ltdl
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#include <ltdl.h>
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// stl
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#include <algorithm>
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#include <stdexcept>
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namespace mapnik
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{
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using namespace std;
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using namespace boost;
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bool is_input_plugin (std::string const& filename)
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{
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return boost::algorithm::ends_with(filename,std::string(".input"));
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}
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datasource_cache::datasource_cache()
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{
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if (lt_dlinit()) throw std::runtime_error("lt_dlinit() failed");
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}
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datasource_cache::~datasource_cache()
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{
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lt_dlexit();
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}
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std::map<string,boost::shared_ptr<PluginInfo> > datasource_cache::plugins_;
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bool datasource_cache::registered_=false;
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datasource_ptr datasource_cache::create(const parameters& params)
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{
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boost::optional<std::string> type = params.get<std::string>("type");
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if ( ! type)
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{
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throw config_error(string("Could not create datasource. Required ") +
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"parameter 'type' is missing");
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}
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datasource_ptr ds;
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map<string,boost::shared_ptr<PluginInfo> >::iterator itr=plugins_.find(*type);
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if ( itr == plugins_.end() )
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{
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throw config_error(string("Could not create datasource. No plugin ") +
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"found for type '" + * type + "'");
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}
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if ( ! itr->second->handle())
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{
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throw std::runtime_error(string("Cannot load library: ") +
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lt_dlerror());
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}
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create_ds* create_datasource =
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(create_ds*) lt_dlsym(itr->second->handle(), "create");
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if ( ! create_datasource)
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{
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throw std::runtime_error(string("Cannot load symbols: ") +
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lt_dlerror());
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}
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#ifdef MAPNIK_DEBUG
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std::clog << "size = " << params.size() << "\n";
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parameters::const_iterator i = params.begin();
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for (;i!=params.end();++i)
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{
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std::clog << i->first << "=" << i->second << "\n";
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}
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#endif
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ds=datasource_ptr(create_datasource(params), datasource_deleter());
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#ifdef MAPNIK_DEBUG
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std::clog<<"datasource="<<ds<<" type="<<type<<std::endl;
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#endif
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return ds;
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}
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bool datasource_cache::insert(const std::string& type,const lt_dlhandle module)
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{
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return plugins_.insert(make_pair(type,boost::shared_ptr<PluginInfo>
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(new PluginInfo(type,module)))).second;
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}
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void datasource_cache::register_datasources(const std::string& str)
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{
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#ifdef MAPNIK_THREADSAFE
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mutex::scoped_lock lock(mapnik::singleton<mapnik::datasource_cache,
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mapnik::CreateStatic>::mutex_);
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#endif
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filesystem::path path(str);
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filesystem::directory_iterator end_itr;
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if (exists(path) && is_directory(path))
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{
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for (filesystem::directory_iterator itr(path);itr!=end_itr;++itr )
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{
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if (!is_directory( *itr ) && is_input_plugin(itr->leaf()))
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{
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try
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{
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lt_dlhandle module=lt_dlopen(itr->string().c_str());
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if (module)
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{
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datasource_name* ds_name =
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(datasource_name*) lt_dlsym(module, "datasource_name");
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if (ds_name && insert(ds_name(),module))
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{
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#ifdef MAPNIK_DEBUG
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std::clog<<"registered datasource : "<<ds_name()<<std::endl;
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#endif
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registered_=true;
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}
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}
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else
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{
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std::clog << lt_dlerror() << "\n";
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}
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}
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catch (...) {}
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}
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}
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}
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}
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}
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