123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/*
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ELEMENT-QUERY.hpp - session sub-interface to query and retrieve elements
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Copyright (C) Lumiera.org
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2010, 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 the
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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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#ifndef MOBJECT_SESSION_ELEMENT_QUERY_H
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#define MOBJECT_SESSION_ELEMENT_QUERY_H
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//#include "lib/p.hpp"
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//#include "lib/query.hpp"
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#include "proc/mobject/placement.hpp"
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#include "proc/mobject/mobject-ref.hpp"
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#include "proc/mobject/session/specific-contents-query.hpp"
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#include "proc/mobject/session/session-service-explore-scope.hpp"
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//#include <boost/scoped_ptr.hpp>
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#include <boost/noncopyable.hpp>
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#include <tr1/functional>
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namespace mobject {
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namespace session {
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// using lumiera::P;
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// using boost::scoped_ptr;
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using std::tr1::function;
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namespace { // type matching helper
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//////////////////////////////TICKET #644 combine/clean up! see also specific-contents-query.hpp
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template<class PRED>
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struct _PickRes;
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template<class MO>
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struct _PickRes<function<bool(Placement<MO> const&)> >
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{
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typedef MO Type;
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typedef MORef<MO> Result;
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typedef typename ScopeQuery<MO>::iterator Iterator;
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};
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template<class MO>
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struct _PickRes<bool(&)(Placement<MO> const&)>
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{
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typedef MO Type;
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typedef MORef<MO> Result;
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typedef typename ScopeQuery<MO>::iterator Iterator;
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};
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template<class MO>
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struct _PickRes<bool(*)(Placement<MO> const&)>
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{
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typedef MO Type;
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typedef MORef<MO> Result;
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typedef typename ScopeQuery<MO>::iterator Iterator;
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};
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}
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/**
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* Access point to session global search and query functions.
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* This sub-component of the public session interface allows to
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* search and retrieve objects from the high-level-model, by type
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* and using additional filter predicates.
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*
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* WIP-WIP-WIP as of 6/2010 -- this might evolve into an extended
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* query facility, using specialised sub-indices and dedicated queries.
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* For now the motivation to package this as a separate interface module
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* was just to reduce the includes on the top level session API and to allow
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* for templated search functions, based on function objects.
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*/
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class ElementQuery
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: boost::noncopyable
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{
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public:
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template<typename PRED>
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typename _PickRes<PRED>::Result
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pick (PRED const& searchPredicate)
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{
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typedef typename _PickRes<PRED>::Result ResultRef;
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typedef typename _PickRes<PRED>::Iterator Iterator;
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Iterator iter (pickAllSuitable ( SessionServiceExploreScope::getScopeRoot()
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, searchPredicate
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, SessionServiceExploreScope::getResolver()
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));
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ResultRef found;
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if (iter) // in case there is an result
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found.activate(*iter); // pick the first element found...
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return found; // or return an empty MObjectRef else
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}
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};
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}} // namespace mobject::session
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#endif
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