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/*
Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef LIBDCP_REF_H
#define LIBDCP_REF_H
#include "exceptions.h"
#include "object.h"
#include <boost/shared_ptr.hpp>
#include <string>
namespace dcp {
template<class T>
class Ref
{
public:
Ref (std::string id)
: _id (id)
{}
Ref (boost::shared_ptr<T> object)
: _id (object->id ())
, _object (object)
{}
void set_id (std::string id)
{
_id = id;
}
void resolve (std::list<boost::shared_ptr<Object> > objects)
{
typename std::list<boost::shared_ptr<Object> >::iterator i = objects.begin();
while (i != objects.end() && (*i)->id() != _id) {
++i;
}
if (i != objects.end ()) {
_object = boost::dynamic_pointer_cast<T> (*i);
}
}
std::string id () const {
return _id;
}
boost::shared_ptr<T> object () const {
if (!_object) {
throw UnresolvedRefError (_id);
}
return _object;
}
T * operator->() const {
if (!_object) {
throw UnresolvedRefError (_id);
}
return _object.get ();
}
bool resolved () const {
return _object;
}
private:
std::string _id;
boost::shared_ptr<T> _object;
};
}
#endif
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