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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2013 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */

#ifndef OSGEARTH_REGISTRY
#define OSGEARTH_REGISTRY 1

#include <osgEarth/Common>
#include <osgEarth/CachePolicy>
#include <osgEarth/Units>
#include <OpenThreads/ReentrantMutex>
#include <OpenThreads/ScopedLock>
#include <osgEarth/ThreadingUtils>
#include <osg/Referenced>
#include <osgDB/ReaderWriter>
#include <osgText/Font>

#define GDAL_SCOPED_LOCK \
    OpenThreads::ScopedLock<OpenThreads::ReentrantMutex> _slock( osgEarth::Registry::instance()->getGDALMutex() )\


namespace osgEarth
{    
    class Cache;
    class Capabilities;
    class Profile;
    class ShaderFactory;
    class TaskServiceManager;
    class URIReadCallback;
    class ColorFilterRegistry;
    class StateSetCache;

    /**
     * Application-wide global repository.
     */
    class OSGEARTH_EXPORT Registry : public osg::Referenced
    {
    public:
        /** Access the global Registry singleton. */
        static Registry* instance(bool erase = false);

        /** Gets a well-known named profile instance. */
        const Profile* getNamedProfile( const std::string& name ) const;

        /** Gets the global-geodetic builtin profile */
        const Profile* getGlobalGeodeticProfile() const;

        /** Gets the global-meractor builtin profile (mercator/WGS84 datum) */
        const Profile* getGlobalMercatorProfile() const;

        /** Gets the spherical-mercator builtin profile (mercator/sphere) */
        const Profile* getSphericalMercatorProfile() const;

        /** Gets the unified cube builtin profile */
        const Profile* getCubeProfile() const;

        /** Access to the application-wide GDAL serialization mutex. GDAL is not thread-safe. */
        OpenThreads::ReentrantMutex& getGDALMutex();

        /** The system-wide default cache. */
        Cache* getCache() const;
        void setCache( Cache* cache );

        /** The override cache policy (overrides all others if set) */
        const optional<CachePolicy>& overrideCachePolicy() const { return _overrideCachePolicy; }
        void setOverrideCachePolicy( const CachePolicy& policy );

        /** The default cache policy (used when no policy is set) */
        const optional<CachePolicy>& defaultCachePolicy() const { return _defaultCachePolicy; }
        void setDefaultCachePolicy( const CachePolicy& policy );

        /**
         * Gets the cache policy. 
         * First checks for an override policy; then looks in the DB::Options for one,
         * then checks for the default policy; then returns false as a last resort.
         */
        bool getCachePolicy( optional<CachePolicy>& cp, const osgDB::Options* options =0L ) const;

        /**
         * Whether the given filename is blacklisted
         */
        bool isBlacklisted(const std::string &filename);

        /**
         * Blacklist the given filename
         */
        void blacklist(const std::string &filename);

        /**
         * Gets the number of blacklisted filenames
         */
        unsigned int getNumBlacklistedFilenames();

        /**
         * Clears the blacklist
         */
        void clearBlacklist();

        /**
         * Sets or gets a default system font to use
         */
        void setDefaultFont( osgText::Font* font );
        osgText::Font* getDefaultFont();

        /**
         * The graphics hardware capabilities for this platform.
         */
        const Capabilities& getCapabilities() const;
        void setCapabilities( Capabilities* caps );
        static const Capabilities& capabilities() { return instance()->getCapabilities(); }

        /**
         * Gets or sets the default shader factory. You can replace the default
         * shader factory if you want to alter any of osgEarth's baseline shaders
         * (advanced usage).
         */
        const ShaderFactory* getShaderFactory() const;
        void setShaderFactory( ShaderFactory* lib );
        static const ShaderFactory* shaderFactory() { return instance()->getShaderFactory(); }

        /**
         * A default StateSetCache to use by any process that uses one.
         * A StateSetCache assist in stateset sharing across multiple nodes.
         * Note: A registry-wide SSC is only supported in OSG 3.1.4+. See
         * the Registry.cpp comments for details.
         */
        StateSetCache* getStateSetCache() const;
        void setStateSetCache( StateSetCache* cache );
        static StateSetCache* stateSetCache() { return instance()->getStateSetCache(); }

        /**
         * Gets a reference to the global task service manager.
         */
        TaskServiceManager* getTaskServiceManager() {
            return _taskServiceManager.get(); }

        /**
         * Generates an instance-wide global unique ID.
         */
        UID createUID();

        /**
         * Sets a global read callback for URI objects.
         */
        void setURIReadCallback( URIReadCallback* callback );

        /**
         * Gets the global read callback for URI objects.
         */
        URIReadCallback* getURIReadCallback() const;

        /**
         * Gets the default set of osgDB::Options to use.
         */
        const osgDB::Options* getDefaultOptions() const { return _defaultOptions.get(); }

        /**
         * Clones an options structure (fixing the archive caching), or creates
         * a new one.
         */
        osgDB::Options* cloneOrCreateOptions( const osgDB::Options* options =0L ) const;

        /**
         * Registers a Units definition.
         */
        void registerUnits( const Units* staticInstance );

        const Units* getUnits(const std::string& name) const;

        /**
         * The name of the default terrain engine driver
         */
        void setDefaultTerrainEngineDriverName( const std::string& name );
        const std::string& getDefaultTerrainEngineDriverName() const { return _terrainEngineDriver; }

    protected:
        virtual ~Registry();
        Registry();

        void destruct();

        OpenThreads::ReentrantMutex _gdal_mutex;
        bool _gdal_registered;

        osg::ref_ptr<const Profile> _global_geodetic_profile;
        osg::ref_ptr<const Profile> _global_mercator_profile;
        osg::ref_ptr<const Profile> _spherical_mercator_profile;
        osg::ref_ptr<const Profile> _cube_profile;

        Threading::ReadWriteMutex _regMutex;  
        int _numGdalMutexGets;
        
        typedef std::map< std::string, std::string> MimeTypeExtensionMap;
        // maps mime-types to extensions.
        MimeTypeExtensionMap _mimeTypeExtMap;

        osg::ref_ptr<Cache> _cache;
        optional<CachePolicy> _defaultCachePolicy;
        optional<CachePolicy> _overrideCachePolicy;

        typedef std::set<std::string> StringSet;
        StringSet _blacklistedFilenames;
        Threading::ReadWriteMutex _blacklistMutex;

        osg::ref_ptr<ShaderFactory> _shaderLib;

        osg::ref_ptr<TaskServiceManager> _taskServiceManager;

        // unique ID generator:
        int                      _uidGen;
        mutable Threading::Mutex _uidGenMutex;

        // system capabilities:
        osg::ref_ptr< Capabilities > _caps;
        mutable Threading::Mutex     _capsMutex;
        void initCapabilities();

        osg::ref_ptr<osgDB::Options> _defaultOptions;

        osg::ref_ptr<URIReadCallback> _uriReadCallback;

        osg::ref_ptr<osgText::Font> _defaultFont;

        typedef std::vector<const Units*> UnitsVector;
        UnitsVector                       _unitsVector;
        mutable Threading::ReadWriteMutex _unitsVectorMutex;

        osg::ref_ptr<StateSetCache> _stateSetCache;

        std::string _terrainEngineDriver;
    };
}


/** Proxy class for automatic registration of Units with the Registry.*/
struct osgEarthRegisterUnits {
    osgEarthRegisterUnits(const osgEarth::Units* units) {
        osgEarth::Registry::instance()->registerUnits(units);
    }
};
#define OSGEARTH_REGISTER_UNITS(NAME,INSTANCE) \
    static osgEarthRegisterUnits s_osgEarthRegistryUnitsProxy##NAME (INSTANCE)



#endif //OSGEARTH_REGISTRY