94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
// ResourceManager.hxx -- manage finding resources by names/paths
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// Copyright (C) 2010 James Turner
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Library General Public License for more details.
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//
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef SG_RESOURCE_MANAGER_HXX
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#define SG_RESOURCE_MANAGER_HXX
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#include <vector>
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#include <simgear/misc/sg_path.hxx>
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namespace simgear
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{
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class ResourceProvider;
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/**
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* singleton management of resources
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*/
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class ResourceManager
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{
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public:
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typedef enum {
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PRIORITY_DEFAULT = 0,
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PRIORITY_FALLBACK = -100,
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PRIORITY_NORMAL = 100,
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PRIORITY_HIGH = 1000
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} Priority;
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static ResourceManager* instance();
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/**
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* add a simple fixed resource location, to resolve against
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*/
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void addBasePath(const SGPath& aPath, Priority aPriority = PRIORITY_DEFAULT);
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/**
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*
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*/
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void addProvider(ResourceProvider* aProvider);
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/**
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* given a resource name (or path), find the appropriate real resource
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* path.
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* @param aContext an optional current location to resolve relative names
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* against (e.g a current directory)
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*/
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SGPath findPath(const std::string& aResource, SGPath aContext = SGPath());
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private:
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ResourceManager();
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typedef std::vector<ResourceProvider*> ProviderVec;
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ProviderVec _providers;
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};
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class ResourceProvider
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{
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public:
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virtual SGPath resolve(const std::string& aResource, SGPath& aContext) const = 0;
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virtual int priority() const
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{
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return _priority;
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}
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protected:
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ResourceProvider(int aPriority) :
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_priority(aPriority)
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{}
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int _priority;
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};
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} // of simgear namespace
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#endif // of header guard
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