class AliADDigitizer: public AliDigitizer

 default constructor
 Initialize OCDB and containers used in the digitization

 constructor
 Initialize OCDB and containers used in the digitization

 constructor
 Initialize OCDB and containers used in the digitization

 destructor

 Initialises the digitizer
 Initialize OCDB and containers used in the digitization

 Creates digits from hits

 Digitize the hits to the level of
 SDigits (fTime arrays)

 Digitize the fTime arrays (SDigits) to the level of
 Digits (fAdc arrays)

 Read SDigits which are then to precessed
 in the following method

 Take fAdc arrays filled by the previous
 method and produce and add digits to the digit Tree

 Take fTime arrays filled by the previous
 method and produce and add sdigits to the sdigit Tree

/
  AliCDBManager *man = AliCDBManager::Instance();

  AliCDBEntry *entry=0;

  entry = man->Get("AD/Calib/Data");

  AliADCalibData *calibdata = 0;

  if (entry) calibdata = (AliADCalibData*) entry->GetObject();
  if (!calibdata)  AliFatal("No calibration data from calibration database !");
/

 this function simulates the time
 of arrival of the photons at the
 photocathode

 this function describes the
 PM time response to a single
 photoelectron

 this function describes the
 PM amplitude response to a single
 photoelectron

 Initialize digit array if not already and
 return pointer to it.

 Initialize sdigit array if not already and
 return pointer to it.