StateMachine.cpp

Go to the documentation of this file.

#include "GaudiKernel/StateMachine.h"

namespace Gaudi
{
  namespace StateMachine
  {
    State ChangeState( const Transition transition, const State state )
    {
      switch ( transition ) {
      case CONFIGURE:
        if ( OFFLINE == state ) {
          return CONFIGURED;
        }
        break;
      case INITIALIZE:
        if ( CONFIGURED == state ) {
          return INITIALIZED;
        }
        break;
      case START:
        if ( INITIALIZED == state ) {
          return RUNNING;
        }
        break;
      case STOP:
        if ( RUNNING == state ) {
          return INITIALIZED;
        }
        break;
      case FINALIZE:
        if ( INITIALIZED == state ) {
          return CONFIGURED;
        }
        break;
      case TERMINATE:
        if ( CONFIGURED == state ) {
          return OFFLINE;
        }
        break;
      }
      std::stringstream msg;
      msg << "Invalid transition '" << transition << "' from state '" << state << "'";
      throw GaudiException( msg.str(), "Gaudi::StateMachine::ChangeState", StatusCode( StatusCode::FAILURE, true ) );
      return OFFLINE; // never reached, but maked the compiler happy
    }
  }
} // namespace Gaudi::StateMachine