// $Id: GetAlg.h,v 1.2 2007/11/20 13:01:06 marcocle Exp $
 // ============================================================================
 #ifndef GAUDIALG_GETALG_H 
 #define GAUDIALG_GETALG_H 1
 // ============================================================================
 // Include files 
 // ============================================================================
 // GaudiKernnel
 // ============================================================================
 #include "GaudiKernel/IAlgorithm.h"
 // ============================================================================
 // forward declarations 
 // ============================================================================
 class IAlgContextSvc ;
 // ============================================================================
 namespace Gaudi
 {
   namespace Utils 
   {
     // ========================================================================
     /** @class AlgSelector
      *  Simple interface class for selection of algorithms 
      *  @author Vanya BELYAEV ibelyaev@physics.syr.edu
      *  @date 2007-09-07
      */
     class AlgSelector
     {
     public:
       /// the only one essential method:
       virtual bool operator() ( const IAlgorithm* ) const = 0 ;
       // virtual destructor 
       virtual ~AlgSelector () ;
     };
     // ========================================================================
     /** @class AlgTypeSelector 
      *  The trivial selector of algorithm by type 
      *  @see Gaudi::Utils::AlgSelector
      *  @author Vanya BELYAEV ibelyaev@physics.syr.edu
      *  @date 2007-09-07
      */     
     template <class TYPE>
     class AlgTypeSelector : public AlgSelector 
     {
     public:
       /// the only one essential method:
       virtual bool operator() ( const IAlgorithm* a ) const 
       { return dynamic_cast<const TYPE*>( a ) != 0; }
     } ;
     // ========================================================================
     template <class TYPE>
     class AlgTypeSelector<TYPE*>       : public AlgTypeSelector<TYPE>   {} ;
     // ========================================================================
     template <class TYPE>
     class AlgTypeSelector<const TYPE*> : public AlgTypeSelector<TYPE>   {} ;
     // ========================================================================
     template <class TYPE>
     class AlgTypeSelector<TYPE&>       : public AlgTypeSelector<TYPE>   {} ;
     // ========================================================================
     template <class TYPE>
     class AlgTypeSelector<const TYPE&> : public AlgTypeSelector<TYPE>   {} ;
     // ========================================================================
     template <class TYPE>
     class AlgTypeSelector<const TYPE>  : public AlgTypeSelector<TYPE>   {} ;
     // ========================================================================
     /** @class AlgNameSelector 
      *  The trivial selector of algorithm by type 
      *  @see Gaudi::Utils::AlgSelector
      *  @author Vanya BELYAEV ibelyaev@physics.syr.edu
      *  @date 2007-09-07
      */     
     class AlgNameSelector : public AlgSelector 
     {
     public:
       /// constructor form the name 
       AlgNameSelector ( const std::string& name  ) : m_name ( name ) {} ;
       /// the only one essential method:
       virtual bool operator() ( const IAlgorithm* a ) const 
       { return 0 != a ? a->name() == m_name : false ; }
     private:
       // the default constructor is disabled 
       AlgNameSelector() ;
     private:
       // algorithm name
       std::string m_name ; ///< algorithm name
     } ;
     // ========================================================================
   } // end of namespace Gaudi::Utils 
 } // end of namespace Gaudi 
 // ============================================================================
 namespace Gaudi
 {
   namespace Utils 
   {
     // ========================================================================
     /** simple function to get the algorithm from Context Service
      * 
      *  @code
      * 
      *  // get the selector 
      *  const AlgSelector& selector = ... ;
      * 
      *  // get the context service:
      *  const IAlgContextSvc* svc = ... ;
      *
      *  // get the appropriate algorithm:
      *  IAlgorithm* alg = getAlgorithm ( svc , selector ) ;
      *
      *  @endcode 
      *  
      *  @see IAlgContextSvc 
      *  @see Gaudi::Utils::AlgSelector
      *  @param svc pointer to Algororithm Contetx Service
      *  @param sel the selection functor 
      *  @author Vanya BELYAEV ibelyaev@physics.syr.edu
      *  @date 2007-09-07
      */
     IAlgorithm* getAlgorithm  
     ( const IAlgContextSvc* svc , 
       const AlgSelector&    sel ) ;
     // ========================================================================
     /** simple function to get the algorithm from Context Service
      * 
      *  @code
      * 
      *  // get the selector 
      *  const AlgSelector& selector = ... ;
      * 
      *  // get the list of algorithms:
      *  const std::vector<IAlgorithm*>& algs = ... ;
      *
      *  // get the appropriate algorithm:
      *  IAlgorithm* alg = getAlgorithm ( algs  , selector ) ;
      *
      *  @endcode 
      *  
      *  @see IAlgContextSvc 
      *  @see Gaudi::Utils::AlgSelector
      *  @param lst list of the algorithms 
      *  @param sel the selection functor 
      *  @author Vanya BELYAEV ibelyaev@physics.syr.edu
      *  @date 2007-09-07
      */
     IAlgorithm* getAlgorithm  
     ( const std::vector<IAlgorithm*>& lst , 
       const AlgSelector&              sel ) ;
     // ========================================================================
   } // end of namespace Gaudi::Utils 
 } // end of namespace Gaudi 
 // ============================================================================
 // The END 
 // ============================================================================
 #endif // GAUDIALG_GETALG_H
 // ============================================================================
 

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