triggerExpression::Prescaler Class Reference

#include <TriggerExpressionPrescaler.h>

Inheritance diagram for triggerExpression::Prescaler:

Public Member Functions
void	dump (std::ostream &out) const
void	init (const Data &data)
bool	operator() (const Data &data) const
	Prescaler (Evaluator *arg, unsigned int prescale)
Public Member Functions inherited from triggerExpression::UnaryOperator
	UnaryOperator (Evaluator *arg)
Public Member Functions inherited from triggerExpression::Evaluator
	Evaluator ()
virtual	~Evaluator ()

Private Attributes
unsigned int	m_counter
unsigned int	m_prescale

Additional Inherited Members
Protected Attributes inherited from triggerExpression::UnaryOperator
boost::scoped_ptr< Evaluator >	m_arg

Detailed Description

Definition at line 9 of file TriggerExpressionPrescaler.h.

Constructor & Destructor Documentation

triggerExpression::Prescaler::Prescaler ( Evaluator *  arg, unsigned int  prescale  )

inline

Definition at line 11 of file TriggerExpressionPrescaler.h.

                                                    :
    UnaryOperator(arg),
    m_prescale(prescale),
    m_counter()
  { }

Member Function Documentation

void triggerExpression::Prescaler::dump ( std::ostream &  out ) const

inlinevirtual

Implements triggerExpression::Evaluator.

Definition at line 21 of file TriggerExpressionPrescaler.h.

References m_prescale.

                                    {
    out << "(" << (*m_arg) << " / " << m_prescale << ")";
  }

void triggerExpression::Prescaler::init ( const Data &  data )

virtual

Reimplemented from triggerExpression::UnaryOperator.

Definition at line 22 of file TriggerExpressionPrescaler.cc.

References triggerExpression::Data::eventNumber(), triggerExpression::UnaryOperator::init(), and m_counter.

                                      {
  // initialize the depending modules
  UnaryOperator::init(data);

  // initialize the counter to the first event number seen, 
  // in order to avoid all prescalers on different FUs to be syncronous
  m_counter = data.eventNumber();
}

bool triggerExpression::Prescaler::operator() ( const Data &  data ) const

virtual

Implements triggerExpression::Evaluator.

Definition at line 5 of file TriggerExpressionPrescaler.cc.

References data, m_counter, m_prescale, and query::result.

                                                  {
  // if the prescale factor is 0, we never need to run any dependent module,
  // so we can safely skip the rest of the processing
  if (m_prescale == 0)
    return false;

  bool result = ((*m_arg)(data));
  if (not result)
    return false;

  // if the prescale factor is 1, we do not need to keep track of the event counter
  if (m_prescale == 1)
    return true;

  return (++m_counter % m_prescale) == 0;
}

Member Data Documentation

unsigned int triggerExpression::Prescaler::m_counter

mutableprivate

Definition at line 27 of file TriggerExpressionPrescaler.h.

Referenced by init(), and operator()().

unsigned int triggerExpression::Prescaler::m_prescale

private

Definition at line 26 of file TriggerExpressionPrescaler.h.

Referenced by dump(), and operator()().