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/* vim: set sw=4 sts=4 et foldmethod=syntax : */
/*
* Copyright (c) 2010 Ciaran McCreesh
*
* This file is part of the Paludis package manager. Paludis is free software;
* you can redistribute it and/or modify it under the terms of the GNU General
* Public License version 2, as published by the Free Software Foundation.
*
* Paludis 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., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <paludis/resolver/decision_utils.hh>
#include <paludis/resolver/decision.hh>
using namespace paludis;
using namespace paludis::resolver;
namespace
{
struct IDVisitor
{
std::shared_ptr<const PackageID> visit(const ChangesToMakeDecision & decision) const
{
return decision.origin_id();
}
std::shared_ptr<const PackageID> visit(const BreakDecision & decision) const
{
return decision.existing_id();
}
std::shared_ptr<const PackageID> visit(const ExistingNoChangeDecision & decision) const
{
return decision.existing_id();
}
std::shared_ptr<const PackageID> visit(const NothingNoChangeDecision &) const
{
return nullptr;
}
std::shared_ptr<const PackageID> visit(const RemoveDecision &) const
{
return nullptr;
}
std::shared_ptr<const PackageID> visit(const UnableToMakeDecision &) const
{
return nullptr;
}
};
}
const std::shared_ptr<const PackageID>
paludis::resolver::get_decided_id_or_null(const std::shared_ptr<const Decision> & decision)
{
return decision->accept_returning<std::shared_ptr<const PackageID> >(IDVisitor());
}
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