def __init__(self, ref):
"""
Create either a new TRE or refer to an existing underlying TRE
The ref parameter is checked
"""
self.error = Error()
if isinstance(ref, str):
tag = ref
ref = nitropy.nitf_TRE_construct(tag, None, self.error)
if not ref:
raise Exception('Unable to create TRE with tag \'%s\'' % tag)
self.ref = ref
def newSubheaderFields(self, tag, id=None):
self.ref.subheaderFields = nitropy.nitf_TRE_construct(
tag, id, self.error)
if not self.ref.subheaderFields:
raise Exception('Unable to create TRE with tag \'%s\'' % tag)
return TRE(self.ref.subheaderFields)