def get_buildnumber_for_revision(self, revision, refresh=False):
"""
:param revision: subversion revision to look for, int
:param refresh: boolean, whether or not to refresh the revision -> buildnumber map
:return: list of buildnumbers, [int]
"""
if self.get_scm_type() == 'svn' and not isinstance(revision, int):
revision = int(revision)
if self._revmap is None or refresh:
self._revmap = self.get_revision_dict()
try:
return self._revmap[revision]
except KeyError:
raise NotFound("Couldn't find a build with that revision")