starblockfactory.h

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/***************************************************************************
                 starblockfactory.h  -  K Desktop Planetarium
                             -------------------
    begin                : 7 Jun 2008
    copyright            : (C) 2008 by Akarsh Simha
    email                : akarshsimha@gmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef STARBLOCKFACTORY_H
#define STARBLOCKFACTORY_H

#include "typedef.h"
#include "starblock.h"

class StarBlockFactory {

 public:

    static StarBlockFactory *Instance();

    ~StarBlockFactory();


    StarBlock *getBlock();

    bool markFirst( StarBlock *block );

    bool markNext( StarBlock *after, StarBlock *block );

    inline int getBlockCount() { return nBlocks; }

    inline int freeAll() { return deleteBlocks( nBlocks ); }

    int freeUnused();

    void printStructure();

    quint32 drawID;            // A number identifying the current draw cycle

 private:

    StarBlockFactory();

    int deleteBlocks( int nblocks );

    StarBlock *first, *last;   // Pointers to the beginning and end of the linked list
    int nBlocks;               // Number of blocks we currently have in the cache
    int nCache;                // Number of blocks to start recycling cached blocks at

    static StarBlockFactory *pInstance;

};

#endif