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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_FEATURES_LABELSOURCE_H
#define OSGEARTH_FEATURES_LABELSOURCE_H 1

#include <osgEarthFeatures/Common>
#include <osgEarthFeatures/Feature>
#include <osgEarthFeatures/FilterContext>
#include <osgEarth/Config>
#include <osgEarth/Revisioning>
#include <osgEarthSymbology/TextSymbol>

namespace osgEarth { namespace Features
{  
    using namespace osgEarth;
    using namespace osgEarth::Symbology;

    /**
     * Configuration options for a label source.
     */
    class OSGEARTHFEATURES_EXPORT LabelSourceOptions : public DriverConfigOptions
    {
    public:
        LabelSourceOptions( const ConfigOptions& options =ConfigOptions() )
            : DriverConfigOptions( options )
        {
            fromConfig(_conf);
        }
        
        virtual ~LabelSourceOptions() { }

    public:
        virtual Config getConfig() const;

    protected:
        virtual void mergeConfig( const Config& conf );
        
    private:
        void fromConfig( const Config& conf );
    };

    //--------------------------------------------------------------------

    /**
     * Plugin object that generates text label nodes.
     */
    class OSGEARTHFEATURES_EXPORT LabelSource : public osg::Object, public Revisioned
    {
    public:        
        LabelSource( const LabelSourceOptions& options =LabelSourceOptions() )
        {
            //nop
        }

        /**
         * Subclass implements this method to create the labeling node.
         */
        virtual osg::Node* createNode(
            const FeatureList&   input,
            const Style&         style,
            const FilterContext& context ) =0;

        /**
         * Creates a single labeling node.
         *
         * @param text     Text string to put in the label
         * @param style    Style information for the label
         *
         * @return A scene graph node
         */
        virtual osg::Node* createNode(
            const std::string&  text,
            const Style&        style ) =0;


    public:
        
        // META_Object specialization:
        virtual osg::Object* cloneType() const { return 0; } // cloneType() not appropriate
        virtual osg::Object* clone(const osg::CopyOp&) const { return 0; } // clone() not appropriate
        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const LabelSource*>(obj)!=NULL; }
        virtual const char* className() const { return "LabelSource"; }
        virtual const char* libraryName() const { return "osgEarth::Features"; }

    protected:
        virtual ~LabelSource() { }
    };

    //--------------------------------------------------------------------

    class OSGEARTHFEATURES_EXPORT LabelSourceDriver : public osgDB::ReaderWriter
    {
    protected:
        const LabelSourceOptions& getLabelSourceOptions( const osgDB::ReaderWriter::Options* rwOpt ) const;
    };

    //--------------------------------------------------------------------

    class OSGEARTHFEATURES_EXPORT LabelSourceFactory
    {   
	public:
        static LabelSource* create( const LabelSourceOptions& options =LabelSourceOptions() );
    };

} } // namespace osgEarth::Features

#endif // OSGEARTH_FEATURES_LABELSOURCE_H