118 lines
3.6 KiB
C++
118 lines
3.6 KiB
C++
/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//$Id: datasource_cache.cpp 23 2005-03-22 22:16:34Z pavlenko $
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#include "datasource_cache.hpp"
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#include <algorithm>
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#include <stdexcept>
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#include <boost/filesystem/operations.hpp>
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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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datasource_cache::datasource_cache()
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{
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if (lt_dlinit()) throw;
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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_p datasource_cache::create(const parameters& params)
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{
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datasource_p ds;
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try
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{
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const std::string type=params.get("type");
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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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if (itr->second->handle())
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{
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create_ds* create_datasource = (create_ds*) lt_dlsym(itr->second->handle(), "create");
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if (!create_datasource)
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{
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std::cerr << "Cannot load symbols: " << lt_dlerror() << std::endl;
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}
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else
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{
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ds=datasource_p(create_datasource(params),datasource_deleter());
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}
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}
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else
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{
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std::cerr << "Cannot load library: " << " "<< lt_dlerror() << std::endl;
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}
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}
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std::cout<<"datasource="<<ds<<" type="<<type<<std::endl;
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}
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catch (datasource_exception& ex)
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{
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std::cerr<<ex.what()<<std::endl;
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}
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catch (...)
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{
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std::cerr<<"exception caught "<<std::endl;
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}
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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>(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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Lock lock(&mutex_);
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filesystem::path path(str);
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filesystem::directory_iterator end_itr;
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if (exists(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 ) && itr->leaf()[0]!='.')
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{
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lt_dlhandle module=lt_dlopenext(itr->string().c_str());
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if (module)
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{
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datasource_name* ds_name = (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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std::cout<<"registered datasource : "<<ds_name()<<std::endl;
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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::cerr<<lt_dlerror()<<std::endl;
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}
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}
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}
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}
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}
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}
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