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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
class IterableChunkedFile:
"""File object chunk iterator using yield.
Represents a local file as an iterable object by splitting the file
into chunks. Avoids the file from being completely loaded into memory.
"""
def __init__(self, file_object, chunk_size=1024 * 1024 * 128, close=False):
self.close_after_read = close
self.file_object = file_object
self.chunk_size = chunk_size
def __iter__(self):
try:
while True:
data = self.file_object.read(self.chunk_size)
if not data:
break
yield data
finally:
if self.close_after_read:
self.file_object.close()
def __len__(self):
return len(self.file_object)
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