TRTHitIdHelper Node1 TRTHitIdHelper + isBarrel() + isEndcap() + isPositive() + isNegative() + getRingWheel() + getPhiSector() + getLayerPlane() + getStraw() + buildHitId() + GetHelper() - TRTHitIdHelper() - Initialize() Node2 HitIdHelper # m_IDs # m_currentStorage + HitIdHelper() + ~HitIdHelper() + InitializeField() + InitializeField() + SetFieldValue() + GetFieldValue() + PrintFields() + Print() # SetBit() # UnsetBit() # Store() # Retrieve() Node2->Node1