MeVis/ThirdParty/Sources/Inventor/inventor/lib/database/include/Inventor/elements/SoCacheElement.h

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/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library 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 2.1 of the License, or (at your option) any later version.
 *
 *  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 GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */


/*
 * Copyright (C) 1990,91   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.1.1.1 $
 |
 |   Classes:
 |      SoCacheElement
 |
 |   Author(s)          : Paul S. Strauss, Gavin Bell
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */

#ifndef  _SO_CACHE_ELEMENT_
#define  _SO_CACHE_ELEMENT_

#include <Inventor/elements/SoSubElement.h>

class SoCache;


SoEXTENDER class INVENTOR_API SoCacheElement : public SoElement {

    SO_ELEMENT_HEADER(SoCacheElement);

  public:
    virtual void        init(SoState *state);

    static void         set(SoState *state, SoCache *cache);

    SoCache *           getCache() const { return cache; }

    static SbBool       anyOpen(SoState *state);

    static void         invalidate(SoState *state);

    virtual void        pop(SoState *state, const SoElement *prevTopElement);

    virtual SbBool      matches(const SoElement *elt) const;

    virtual SoElement   *copyMatchInfo() const;

    SoCacheElement *    getNextCacheElement() const
        { return (SoCacheElement *) getNextInStack(); }

  SoINTERNAL public:
    static void         initClass();

    static void         addElement(SoState *state, const SoElement *elt);

    static void         addCacheDependency(SoState *state, SoCache *cache);

    static SbBool       setInvalid(SbBool newValue);

    static SoCache *    getCurrentCache(SoState *state)
        {return ((SoCacheElement*)(state->getElementNoPush(classStackIndex)))->cache;}

    virtual ~SoCacheElement();

  private:
    SoCache             *cache;                 

    static SbBool       invalidated;            

friend class SoElement;
};

#endif /* _SO_CACHE_ELEMENT_ */