/*
 * Copyright (c) 2001, DecisionSoft Limited All rights reserved.
 * Please see LICENSE.TXT for more information.
 */

#ifndef _DATAITEMLITERAL_HPP
#define _DATAITEMLITERAL_HPP

#include <pathan/Pathan.hpp>

#include <pathan/dataItem/DataItemImpl.hpp>
#include <pathan/Sequence.hpp>

class Item;
class ATDecimalOrDerived;
class ATDoubleOrDerived;
class ATStringOrDerived;

/** defines the behaviour for the literal  types*/
class PATHAN_EXPORT DataItemLiteral : public DataItemImpl
{

public:
  DataItemLiteral(const ATStringOrDerived* s, XPath2MemoryManager* memMgr);
  DataItemLiteral(const ATDecimalOrDerived* d, XPath2MemoryManager* memMgr);
  DataItemLiteral(const ATDoubleOrDerived* d, XPath2MemoryManager* memMgr);

  ~DataItemLiteral();

  /**
   * Called during static analysis to determine if statically correct.
   * Performs constant folding.
   */
  virtual DataItem* staticResolution(StaticContext *context, StaticResolutionContext *src);

	//collapase the compiled expression based on context
	virtual Sequence collapseTreeInternal(DynamicContext* context, int flags=0) const;

private:
  const Item* _item;
};

#endif