JPrescaler.hh

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#ifndef __JTRIGGER__JPRESCALER__
#define __JTRIGGER__JPRESCALER__
 
#include <istream>
#include <ostream>
 
#include <TROOT.h>
#include <TObject.h>
 
 
/**
 * \author mdejong
 */
 
namespace JTRIGGER {}
namespace JPP { using namespace JTRIGGER; }
 
namespace JTRIGGER {
 
  /**
   * Auxiliary class for prescaling.
   */
  class JPrescaler :
    public TObject
  {
  public:
    /**
     * Default constructor.
     */
    JPrescaler() :
      prescale(0),
      counter (0)
    {}
 
 
    /**
     * Constructor.
     *
     * \param  value         prescale value (0 is off)
     */
    JPrescaler(const long long int value) :
      prescale(value),
      counter (0)
    {}
 
 
    /**
     * Virtual destructor.
     */
    virtual ~JPrescaler()
    {}
 
 
    /**
     * Equality
     *
     * \param  prescaler     prescaler
     * \return               true if equals; else false
     */
    bool equals(const JPrescaler& prescaler) const
    {
      return  prescale == prescaler.prescale;
    }
 
 
    /**
     * Test operator.
     *
     * This operator increments the internal counter and 
     * checks whether this counter complies with the prescale value.
     *
     * \return               true if this turn not prescaled; else false
     */
    bool operator()() const
    {
      ++counter;
      
      return prescale != 0 && counter%prescale == 0;
    }
 
 
    /**
     * Check status.
     *
     * \return               true if this turn not prescaled; else false
     */
    operator bool() const
    {
      return prescale != 0 && counter%prescale == 0;
    }
    
 
    ClassDef(JPrescaler, 2);
 
    
    long long int          prescale;
    mutable long long int  counter;
  };
};
 
 
#endif