/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSG_PagedLOD
#define OSG_PagedLOD 1

#include <osg/LOD>

namespace osg {

/** PagedLOD.
*/
class SG_EXPORT PagedLOD : public LOD
{
    public :
    
        PagedLOD() {}

        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        PagedLOD(const PagedLOD&,const CopyOp& copyop=CopyOp::SHALLOW_COPY);

        META_Node(osg, PagedLOD);
        
        

        virtual void traverse(NodeVisitor& nv);
        
        virtual bool addChild(Node *child);

        virtual bool addChild(Node *child, float min, float max);

        virtual bool addChild(Node *child, float min, float max,const std::string& filename);

        virtual bool removeChild(Node *child);

        typedef std::vector<std::string> FileNameList;

        void setFileName(unsigned int childNo, const std::string& filename);
        
        const std::string& getFileName(unsigned int childNo) const { return _fileNameList[childNo]; }
        
        /** returns the number of filenames currently set. */
        inline unsigned int getNumFileNames() const { return _fileNameList.size(); }

        /** return the list of filename.*/
        inline FileNameList& getFileNameList() { return _fileNameList; }
        
        /** return the list of filename.*/
        inline const FileNameList& getFileNameList() const { return _fileNameList; }


        typedef std::vector<double> TimeStampList;

        void setTimeStamp(unsigned int childNo, double timeStamp);
        
        double getTimeStamp(unsigned int childNo) const { return _timeStampList[childNo]; }

        /** returns the number of filenames currently set. */
        inline unsigned int getNumTimeStamps() const { return _fileNameList.size(); }

        /** return the list of time stamps.*/
        inline TimeStampList& getTimeStampList() { return _timeStampList; }
        
        /** return the list of time stamps.*/
        inline const TimeStampList& getTimeStampList() const { return _timeStampList; }

        void removeExpiredChildren(double expiryTime);

    protected :
    
        virtual ~PagedLOD() {}

        FileNameList    _fileNameList;
        TimeStampList   _timeStampList;
};

}

#endif