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

#ifndef _DATAITEMVARIABLE_HPP
#define _DATAITEMVARIABLE_HPP

#include <pathan/Pathan.hpp>

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

/** Deals with all the simple variable stuff.*/
class PATHAN_EXPORT DataItemVariable : public DataItemImpl
{
public:
  DataItemVariable(const XMLCh *qualifiedName, XPath2MemoryManager* memMgr);
  DataItemVariable(const XMLCh *prefix, const XMLCh *name, XPath2MemoryManager* memMgr);
  ~DataItemVariable();

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

  /**
   * Called during static analysis to determine if statically correct.  Checks
   * if variable has been defined in the appropriate scope.
   * If not an appropriate error is thrown.
   */
  virtual DataItem* staticResolution(StaticContext *context, StaticResolutionContext *src);

  const XMLCh *getPrefix() const;
  const XMLCh *getURI() const;
  const XMLCh *getName() const;

private:

  const XMLCh* _prefix;
  const XMLCh* _uri;
  const XMLCh* _name;
};

#endif