def _filter_unpacked_dir(self, target, unpacked_dir, class_files):
# The Dx tool returns failure if more than one copy of a class is packed into the dex file and
# it is easy to fetch duplicate libraries (as well as conflicting versions) from the SDK repos.
# This filters the contents of the unpacked_dir against the include/exclude patterns of the
# target, then compares the filtered files against previously gathered class_files to
# dedupe and detect version conflicts.
file_filter = UnpackJars.get_unpack_filter(target)
for root, _, file_names in os.walk(unpacked_dir):
for filename in file_names:
# Calculate the filename relative to the unpacked_dir and then filter.
relative_dir = os.path.relpath(root, unpacked_dir)
class_file = os.path.join(relative_dir, filename)
if file_filter(class_file):
class_location = os.path.join(root, filename)
# If the class_file (e.g. 'a/b/c/Hello.class') has already been added, then compare the
# full path. If the full path is identical then we can ignore it as a duplicate. If
# the path is different, that means that there is probably conflicting version
# numbers amongst the library deps and so we raise an exception.
if class_file in class_files:
if class_files[class_file] != class_location:
raise TaskError("Dependency:\n{}\n\nConflicts\n1: {} "
"\n2: {}".format(target, class_location, class_files[class_file]))
class_files[class_file] = class_location
return class_files.values()
