Ichthyostega
6339a288dd
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137 lines
4.7 KiB
C++
137 lines
4.7 KiB
C++
/*
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DEFS-MANAGER.hpp - access to preconfigured default objects and definitions
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Copyright (C) Lumiera.org
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2008, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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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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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file defs-manager.hpp
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** TODO defs-manager.hpp
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*/
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#ifndef LUMIERA_QUERY_DEFS_MANAGER_H
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#define LUMIERA_QUERY_DEFS_MANAGER_H
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#include "lib/p.hpp"
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#include "common/query.hpp"
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#include <boost/scoped_ptr.hpp>
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#include <boost/noncopyable.hpp>
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namespace lumiera{
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namespace query {
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using lumiera::Query;
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using boost::scoped_ptr;
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namespace impl { class DefsRegistry; }
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/**
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* Organise a collection of preconfigured default objects.
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* For various kinds of objects we can tweak the default parametrisation
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* as part of the general session configuration. A ref to an instance of
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* this class is accessible through the current session and can be used
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* to fill in parts of the configuration of new objects, if the user
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* code didn't give more specific parameters. Necessary sub-objects
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* will be created on demand, and any default configuration, once
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* found, will be remembered and stored with the current session.
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*
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* @note while the logic of defaults handling can be considered
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* roughly final, as of 12/09 most of the actual object
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* handling is placeholder code.
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*/
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class DefsManager : private boost::noncopyable
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{
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scoped_ptr<impl::DefsRegistry> defsRegistry_;
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public:
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DefsManager () throw();
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~DefsManager ();
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/** common access point: retrieve the default object fulfilling
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* some given conditions. May silently trigger object creation.
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* @throw error::Config in case no solution is possible, which
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* is considered \e misconfiguration.
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*/
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template<class TAR>
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lib::P<TAR> operator() (Query<TAR> const&);
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/** search through the registered defaults, never create anything.
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* @return object fulfilling the query, \c empty ptr if not found.
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*/
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template<class TAR>
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lib::P<TAR> search (Query<TAR> const&);
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/** retrieve an object fulfilling the query and register it as default.
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* The resolution is delegated to the ConfigQuery system (which may cause
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* creation of new object instances)
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* @return object fulfilling the query, \c empty ptr if no solution.
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*/
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template<class TAR>
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lib::P<TAR> create (Query<TAR> const&);
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/** register the given object as default, after ensuring it fulfils the
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* query. The latter may cause some properties of the object to be set,
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* trigger creation of additional objects, and may fail altogether.
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* @return true if query was successful and object is registered as default
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* @note only a weak ref to the object is stored
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*/
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template<class TAR>
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bool define (lib::P<TAR> const&, Query<TAR> const& =Query<TAR>());
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/** remove the defaults registration of the given object, if there was such
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* @return false if nothing has been changed because the object wasn't registered
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*/
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template<class TAR>
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bool forget (lib::P<TAR> const&);
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/** @internal for session lifecycle */
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void clear();
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// Q: can we have something along the line of...?
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//
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// template
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// < class TAR, ///< the target to query for
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// template <class> class SMP ///< smart pointer class to wrap the result
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// >
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// SMP<TAR> operator() (const lumiera::Query<TAR>&);
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// 12/09: according to my current knowledge of template metaprogramming, the answer is "no",
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// but we could use a traits template to set up a fixed association of smart pointers
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// and kinds of target object. This would allow to define a templated operator() returning
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// the result wrapped into the right holder. But currently I don't see how to build a sensible
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// implementation infrastructure backing such an interface.
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//////////TICKET #452
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};
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}} // namespace lumiera::query
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#endif
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