#ifndef COIN_SOSTATE_H
#define COIN_SOSTATE_H

/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
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 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
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 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
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#include <Inventor/SbBasic.h>
#include <stdio.h>
#include <assert.h>

class SoAction;
class SoTypeList;
class SoElement;

class COIN_DLL_API SoState {
public:
  SoState(SoAction * action,
          const SoTypeList & enabledelements);
  ~SoState(void);

  SoAction * getAction(void) const;

  SoElement * getElement(const int stackindex);
  const SoElement * getConstElement(const int stackindex) const;

  void push(void);
  void pop(void);

  void print(FILE * const file = stdout) const;

  SbBool isElementEnabled(const int stackindex) const;

  int getDepth(void) const;

  void setCacheOpen(const SbBool flag);
  SbBool isCacheOpen(void) const;

  SoElement * getElementNoPush(const int stackindex) const;

private:
  SoElement ** stack;
  int numstacks;
  SbBool cacheopen;
  class SoStateP * pimpl;  
};

// these methods are used very often, and is therefore inlined

inline SbBool
SoState::isElementEnabled(const int stackindex) const
{
  return (stackindex < this->numstacks) && (this->stack[stackindex] != NULL);
}

inline const SoElement *
SoState::getConstElement(const int stackindex) const
{
  assert(this->isElementEnabled(stackindex));
  return this->stack[stackindex];
}

inline SbBool 
SoState::isCacheOpen(void) const
{
  return this->cacheopen;
}

inline SoElement *
SoState::getElementNoPush(const int stackindex) const
{
  assert(this->isElementEnabled(stackindex));
  return this->stack[stackindex];
}


#endif // !COIN_SOSTATE_H
