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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2006 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
//$Id: datasource_cache.cpp 23 2005-03-22 22:16:34Z pavlenko $
// mapnik
#include <mapnik/datasource_cache.hpp>
#include <mapnik/config_error.hpp>
// boost
#include <boost/version.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/algorithm/string.hpp>
// ltdl
#include <ltdl.h>
// stl
#include <algorithm>
#include <stdexcept>
namespace mapnik
{
using namespace std;
using namespace boost;
bool is_input_plugin (std::string const& filename)
{
return boost::algorithm::ends_with(filename,std::string(".input"));
}
datasource_cache::datasource_cache()
{
if (lt_dlinit()) throw std::runtime_error("lt_dlinit() failed");
}
datasource_cache::~datasource_cache()
{
lt_dlexit();
}
std::map<string,boost::shared_ptr<PluginInfo> > datasource_cache::plugins_;
bool datasource_cache::registered_=false;
std::vector<std::string> datasource_cache::plugin_directories_;
datasource_ptr datasource_cache::create(const parameters& params)
{
boost::optional<std::string> type = params.get<std::string>("type");
if ( ! type)
{
throw config_error(string("Could not create datasource. Required ") +
"parameter 'type' is missing");
}
datasource_ptr ds;
map<string,boost::shared_ptr<PluginInfo> >::iterator itr=plugins_.find(*type);
if ( itr == plugins_.end() )
{
throw config_error(string("Could not create datasource. No plugin ") +
"found for type '" + * type + "' (searched in: " + plugin_directories() + ")");
}
if ( ! itr->second->handle())
{
throw std::runtime_error(string("Cannot load library: ") +
lt_dlerror());
}
create_ds* create_datasource =
(create_ds*) lt_dlsym(itr->second->handle(), "create");
if ( ! create_datasource)
{
throw std::runtime_error(string("Cannot load symbols: ") +
lt_dlerror());
}
#ifdef MAPNIK_DEBUG
std::clog << "size = " << params.size() << "\n";
parameters::const_iterator i = params.begin();
for (;i!=params.end();++i)
{
std::clog << i->first << "=" << i->second << "\n";
}
#endif
ds=datasource_ptr(create_datasource(params), datasource_deleter());
#ifdef MAPNIK_DEBUG
std::clog<<"datasource="<<ds<<" type="<<type<<std::endl;
#endif
return ds;
}
bool datasource_cache::insert(const std::string& type,const lt_dlhandle module)
{
return plugins_.insert(make_pair(type,boost::shared_ptr<PluginInfo>
(new PluginInfo(type,module)))).second;
}
std::string datasource_cache::plugin_directories()
{
return boost::algorithm::join(plugin_directories_,", ");
}
std::vector<std::string> datasource_cache::plugin_names ()
{
std::vector<std::string> names;
std::map<std::string,boost::shared_ptr<PluginInfo> >::const_iterator itr;
for (itr = plugins_.begin();itr!=plugins_.end();++itr)
{
names.push_back(itr->first);
}
return names;
}
void datasource_cache::register_datasources(const std::string& str)
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mapnik::singleton<mapnik::datasource_cache,
mapnik::CreateStatic>::mutex_);
#endif
filesystem::path path(str);
plugin_directories_.push_back(str);
filesystem::directory_iterator end_itr;
if (exists(path) && is_directory(path))
{
for (filesystem::directory_iterator itr(path);itr!=end_itr;++itr )
{
#if BOOST_VERSION < 103400
if (!is_directory( *itr ) && is_input_plugin(itr->leaf()))
#else
if (!is_directory( *itr ) && is_input_plugin(itr->path().leaf()))
#endif
{
try
{
lt_dlhandle module=lt_dlopen(itr->string().c_str());
if (module)
{
datasource_name* ds_name =
(datasource_name*) lt_dlsym(module, "datasource_name");
if (ds_name && insert(ds_name(),module))
{
#ifdef MAPNIK_DEBUG
std::clog << "registered datasource : " << ds_name() << std::endl;
#endif
registered_=true;
}
}
else
{
std::clog << "Problem loading plugin library: " << itr->string().c_str() << " (libtool error: " << lt_dlerror() << ")" << std::endl;
}
}
catch (...) {}
}
}
}
}
}
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