110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
/*
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META.hpp - key abstraction: metadata and organisational asset
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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 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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/** @file meta.hpp
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** Internal and organisational metadata. Some internally created data elements,
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** like automation data sets, inventory of session contents, can be exposed and
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** treated as specific Kind of Asset.
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**
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** For the different <i>Kinds</i> of Assets, we use sub-interfaces inheriting
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** from the general Asset interface. To be able to get asset::Meta instances
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** directly from the AssetManager, we define a specialisation of the Asset ID.
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**
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** @see asset.hpp explanation of assets in general
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** @see MetaFactory creating concrete asset::Meta instances
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**
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*/
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#ifndef ASSET_META_H
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#define ASSET_META_H
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#include "pre_a.hpp"
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#include "proc/asset.hpp"
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#include "lib/factory.hpp"
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namespace asset {
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class Meta;
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class MetaFactory;
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template<>
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class ID<Meta> : public ID<Asset>
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{
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public:
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ID (size_t id);
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ID (const Meta&);
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};
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/**
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* key abstraction: metadata and organisational asset
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* @todo just a stub, still have to figure out the distinctive properties of asset::Meta
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*/
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class Meta : public Asset
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{
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public:
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static MetaFactory create;
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virtual const ID<Meta>& getID() const ///< @return ID of kind Meta
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{
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return static_cast<const ID<Meta>& > (Asset::getID());
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}
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protected:
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Meta (const Asset::Ident& idi) : Asset(idi) {} //////////////TODO
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friend class MetaFactory;
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};
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// definition of ID<Meta> ctors is possible now,
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// after providing full definition of class Proc
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inline ID<Meta>::ID(size_t id) : ID<Asset> (id) {};
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inline ID<Meta>::ID(const Meta& meta) : ID<Asset> (meta.getID()) {};
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typedef P<Meta> PMeta;
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/**
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* Factory specialised for creating Metadata Asset objects.
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*/
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class MetaFactory : public lib::Factory<asset::Meta>
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{
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public:
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typedef P<asset::Meta> PType;
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PType operator() (Asset::Ident& key); ////////////TODO define actual operation
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};
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} // namespace asset
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#endif
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