PileUpHashHelper Class Reference

#include <PileUpHashHelper.h>

Collaboration diagram for PileUpHashHelper:

Public Member Functions
	PileUpHashHelper ()
void	addToHashSource (const std::string &string)
	Add a plain string to the stream.
void	addToHashSource (const xAOD::EventInfo *eventInfo)
	Add subevents to the stream.
void	clearHashSource ()
	Clear the stream.
std::string	hashSource () const
	Get the current hash base.
void	calculateHash (uuid_t &hash) const
	Calculate the hash.

Static Public Member Functions
static xAOD::EventInfo::PileUpMixtureID	uuidToPileUpMixtureId (const uuid_t &hash)
	Convert uuid_t to xAOD::EventInfo::PileUpMixtureID.
static void	pileUpMixtureIdToUuid (const xAOD::EventInfo::PileUpMixtureID &mixture, uuid_t &hash)
	xAOD::EventInfo::PileUpMixtureID to uuid_t

Static Public Attributes
static const uint16_t	PILEUP_SIZE_BYTES = 8
	Size of individual low/high bits in bytes.

Private Attributes
std::stringstream	m_stream

Detailed Description

Definition at line 20 of file PileUpHashHelper.h.

Constructor & Destructor Documentation

PileUpHashHelper()

PileUpHashHelper::PileUpHashHelper ( )

inline

Definition at line 23 of file PileUpHashHelper.h.

{}

Member Function Documentation

addToHashSource() [1/2]

void PileUpHashHelper::addToHashSource

(

const std::string &

string

)

Add a plain string to the stream.

Author

Tadej Novak

Definition at line 11 of file PileUpHashHelper.cxx.

{
  m_stream << string;
}

addToHashSource() [2/2]

void PileUpHashHelper::addToHashSource

(

const xAOD::EventInfo *

eventInfo

)

Add subevents to the stream.

Definition at line 16 of file PileUpHashHelper.cxx.

{
  const std::vector<xAOD::EventInfo::SubEvent> &subEventsSource = eventInfo->subEvents();
  std::vector<std::reference_wrapper<const xAOD::EventInfo::SubEvent>> subEvents(subEventsSource.begin(), subEventsSource.end());
 
  std::stable_sort(subEvents.begin(), subEvents.end(), [](const xAOD::EventInfo::SubEvent &a, const xAOD::EventInfo::SubEvent &b) {
    return (a.ptr()->bcid() < b.ptr()->bcid()) ||
      ((a.ptr()->bcid() == b.ptr()->bcid()) && (a.type() < b.type())) ||
      ((a.ptr()->bcid() == b.ptr()->bcid()) && (a.type() == b.type()) && (a.ptr()->eventNumber() < b.ptr()->eventNumber()));
  });
 
  // Generate subevents info string
  bool first = true;
  for (const xAOD::EventInfo::SubEvent &subevent : subEvents) {
    if (subevent.type() == xAOD::EventInfo::Signal) {
      continue;
    }
 
    if (first) {
      first = false;
    } else {
      m_stream << ";";
    }
 
    m_stream << (static_cast<int32_t>(subevent.ptr()->bcid()) - static_cast<int32_t>(eventInfo->bcid())) << "_" << subevent.type() << "_" << subevent.ptr()->eventNumber();
  }
}

calculateHash()

void PileUpHashHelper::calculateHash

(

uuid_t &

hash

)

const

Calculate the hash.

Definition at line 49 of file PileUpHashHelper.cxx.

{
  std::string sourceStr = m_stream.str();
 
  MD5 md5Hash(sourceStr);
  md5Hash.uuid_digest(hash);
}

clearHashSource()

void PileUpHashHelper::clearHashSource

(

)

Clear the stream.

Definition at line 44 of file PileUpHashHelper.cxx.

{
  m_stream.str(std::string());
}

hashSource()

std::string PileUpHashHelper::hashSource ( ) const

inline

Get the current hash base.

Definition at line 35 of file PileUpHashHelper.h.

{ return m_stream.str(); }

pileUpMixtureIdToUuid()

void PileUpHashHelper::pileUpMixtureIdToUuid ( const xAOD::EventInfo::PileUpMixtureID & mixture, uuid_t & hash )

static

xAOD::EventInfo::PileUpMixtureID to uuid_t

Definition at line 69 of file PileUpHashHelper.cxx.

{
  for (uint16_t i = 0; i < PILEUP_SIZE_BYTES; i++) {
    hash[i] |= (mixture.lowBits >> (i * sizeof(unsigned char) * CHAR_BIT));
    hash[i + PILEUP_SIZE_BYTES] |= (mixture.highBits >> (i * sizeof(unsigned char) * CHAR_BIT));
  }
}

uuidToPileUpMixtureId()

xAOD::EventInfo::PileUpMixtureID PileUpHashHelper::uuidToPileUpMixtureId ( const uuid_t & hash )

static

Convert uuid_t to xAOD::EventInfo::PileUpMixtureID.

Definition at line 57 of file PileUpHashHelper.cxx.

{
  xAOD::EventInfo::PileUpMixtureID mixture{};
 
  for (uint16_t i = 0; i < PILEUP_SIZE_BYTES; i++) {
    mixture.lowBits |= (static_cast<unsigned long long>(hash[i]) << (i * sizeof(unsigned char) * CHAR_BIT));
    mixture.highBits |= (static_cast<unsigned long long>(hash[i + PILEUP_SIZE_BYTES]) << (i * sizeof(unsigned char) * CHAR_BIT));
  }
 
  return mixture;
}

Member Data Documentation

m_stream

std::stringstream PileUpHashHelper::m_stream

private

Definition at line 51 of file PileUpHashHelper.h.

PILEUP_SIZE_BYTES

const uint16_t PileUpHashHelper::PILEUP_SIZE_BYTES = 8

static

Size of individual low/high bits in bytes.

Definition at line 48 of file PileUpHashHelper.h.

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The documentation for this class was generated from the following files:

• PileUpHashHelper.h
• PileUpHashHelper.cxx