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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 OSGEARTHFEATURES_FEATURE_CURSOR_H
#define OSGEARTHFEATURES_FEATURE_CURSOR_H 1

#include <osgEarthFeatures/Common>
#include <osgEarthFeatures/Feature>
#include <osgEarthFeatures/Filter>
#include <osgEarth/Profile>

namespace osgEarth { namespace Features
{   
    using namespace osgEarth;

    /**
     * A cursor that lets you iterate over a collection of features returned 
     * from a feature query performed on a FeatureStore.
     */
    class OSGEARTHFEATURES_EXPORT FeatureCursor : public osg::Referenced
    {
    public:
        virtual bool hasMore() const =0;
        virtual Feature* nextFeature() =0;

    public:
        void fill( FeatureList& output );

        virtual ~FeatureCursor() { }
    };

    /**
     * A simple cursor implementation that returns features from an in-memory
     * feature list.
     */
    class OSGEARTHFEATURES_EXPORT FeatureListCursor : public FeatureCursor
    {
    public:
        FeatureListCursor( const FeatureList& input, bool cloneFeatures =false );
        
        virtual ~FeatureListCursor() { }

        virtual bool hasMore() const;
        virtual Feature* nextFeature();

    protected:
        FeatureList           _features;
        FeatureList::iterator _iter;
        bool                  _clone;
    };

    /**
     * A simple cursor that returns each Geometry wrapped in a feature.
     */
    class OSGEARTHFEATURES_EXPORT GeometryFeatureCursor : public FeatureCursor
    {
    public:
        GeometryFeatureCursor( Symbology::Geometry* geom );
        GeometryFeatureCursor( Symbology::Geometry* geom, const FeatureProfile* fp, const FeatureFilterList& filters );
        virtual ~GeometryFeatureCursor() { }
        virtual bool hasMore() const;
        virtual Feature* nextFeature();
    protected:
        osg::ref_ptr<Symbology::Geometry> _geom;
        osg::ref_ptr<const FeatureProfile> _featureProfile;
        const FeatureFilterList _filters;
        osg::ref_ptr<Feature> _lastFeature;
    };

} } // namespace osgEarth::Features

#endif // OSGEARTHFEATURES_FEATURE_CURSOR_H