def __init__(self, argv):
self.iom = IOManager(argv)
self.keys = {}
self.IF = WhiteImageFactory()
# get keys from rootfile, iterate over the enum
# and see what's in the root file
for i in xrange(larcv.kProductUnknown):
product = larcv.ProductName(i)
self.keys[product] = []
producers = self.iom.iom.producer_list(i)
for p in producers:
self.keys[product].append(p)
# run subrun and event start at zero
self.run = -1
self.subrun = -1
self.event = -1
