ROOTData Namespace Reference

Functions
def	literal2root
def	loadStreamerInfo
def	tfile_cd

Function Documentation

def ROOTData.literal2root	(		literal,
			rootType,
			debug = False
	)

Convert an hexadecimal string into a root-object. In case a
TStreamerInfo object is passed, this will be decoded by the
loadStreamerInfo function to handle it properly and a None object
will be returned. It is the responsibility of the user not the use
the returned object in this very case.

Definition at line 52 of file ROOTData.py.

References loadStreamerInfo().

Referenced by dqm_interfaces.DQMcommunicator.get_root_objects(), dqm_interfaces.DQMcommunicator.get_root_objects_list(), dqm_interfaces.DQMcommunicator.get_root_objects_list_recursive(), dqm_interfaces.DQMcommunicator.get_root_objects_recursive(), and dqm_interfaces.DirWalkerDB.run().

def literal2root (literal, rootType, debug=False):

  """Convert an hexadecimal string into a root-object. In case a
  TStreamerInfo object is passed, this will be decoded by the
  loadStreamerInfo function to handle it properly and a None object
  will be returned. It is the responsibility of the user not the use
  the returned object in this very case."""

  if rootType == "TStreamerInfo":
    loadStreamerInfo(literal, debug)
    return None

  bitsarray = array('B')
  bitsarray.fromstring(literal.decode('hex'))

  tbuffer = TBufferFile(TBufferFile.kRead)
  tbuffer.SetBuffer(bitsarray,len(bitsarray),False)

  # replace a couple of shortcuts with the real root class name
  if rootType == 'TPROF':
      rootType = 'TProfile'
  if rootType == 'TPROF2D':
      rootType = 'TProfile2D'

  root_class = eval(rootType+'.Class()')

  return tbuffer.ReadObject(root_class)

def ROOTData.loadStreamerInfo	(		literal,
			debug
	)

Decode a literal made of TStreamerInfo informations and load
streamers that are not part of the currently used version of
ROOT. The implementation is a back-to-bone and simplified version of
the one contained in the DQM GUI source code.

Definition at line 24 of file ROOTData.py.

Referenced by literal2root().

def loadStreamerInfo(literal, debug):

  """Decode a literal made of TStreamerInfo informations and load
  streamers that are not part of the currently used version of
  ROOT. The implementation is a back-to-bone and simplified version of
  the one contained in the DQM GUI source code."""

  bitsarray = array('B')
  bitsarray.fromstring(literal.decode('hex'))

  tbuffer = TBufferFile(TBufferFile.kRead)
  tbuffer.Reset();
  tbuffer.SetBuffer(bitsarray, len(bitsarray), False)
  while tbuffer.Length() != tbuffer.BufferSize():
    obj = tbuffer.ReadObject(eval("TStreamerInfo.Class()"))
    v = obj.GetClassVersion()
    c = TClass.GetClass(obj.GetName(), kTRUE)
    if c:
      c.GetStreamerInfo();
      if c.GetStreamerInfos().At(v):
        if debug:
          print "skipping already present streamer info version %d for %s" % (v, obj.GetName())
        continue
    if debug:
      print "Importing streamer info version %d for %s" % (v, obj.GetName())
    obj.BuildCheck();