//-----------------------------------------------------------------------------
//
// File and Version Information:
// 	$Id: BdbAbsQuery.hh,v 1.3 1998/01/29 07:39:44 yury Exp $
//
// Description:
//	Class BdbAbsQuery -- defines an interface for looking up a 
//         configuration object.
//
// Environment:
//	Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//	Yury Kolomensky			
//
// Copyright Information:
//	Copyright (C) 1997	Caltech
//
//-----------------------------------------------------------------------------

#ifndef BDBABSQUERY_HH
#define BDBABSQUERY_HH

#include "BaBar/BaBar.hh"

//----------------------
// Base Class Headers --
//----------------------

//-------------------------------
// Collaborating Class Headers --
//-------------------------------
#include "BdbUtil/Bdb.hh"

class BdbConfigObject;
class BdbConfigContObj;
class ooLookupKey;

//		---------------------
// 		-- Class Interface --
//		---------------------
 
class BdbAbsQuery {

//--------------------
// Instance Members --
//--------------------

public:

  // Constructors
  BdbAbsQuery( ) {};
  
  // Destructor
  virtual ~BdbAbsQuery( );

  // evaluate the query
  virtual bool evaluate( const BdbHandle(BdbConfigObject)& ) const = 0;

  // scan a container and return the first object to match the query
  virtual bool lookup(BdbHandle(BdbConfigObject)& theObjectH,
		      const BdbHandle(BdbConfigContObj)& containerH);

  // creates the lookup key to be used in index lookup
  virtual const ooLookupKey* getLookupKey() = 0 ;

};

#endif