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import os
from carquinyol import layoutmanager
from carquinyol import metadatareader
MAX_SIZE = 256
_INTERNAL_KEYS = ['checksum']
class MetadataStore(object):
def store(self, uid, metadata):
metadata_path = layoutmanager.get_instance().get_metadata_path(uid)
if not os.path.exists(metadata_path):
os.makedirs(metadata_path)
else:
for key in os.listdir(metadata_path):
if key not in _INTERNAL_KEYS:
os.remove(os.path.join(metadata_path, key))
metadata['uid'] = uid
for key, value in metadata.items():
# Hack to support activities that still pass properties named as
# for example title:text.
if ':' in key:
key = key.split(':', 1)[0]
f = open(os.path.join(metadata_path, key), 'w')
try:
if isinstance(value, unicode):
value = value.encode('utf-8')
elif not isinstance(value, basestring):
value = str(value)
f.write(value)
finally:
f.close()
def retrieve(self, uid, properties=None):
metadata_path = layoutmanager.get_instance().get_metadata_path(uid)
return metadatareader.retrieve(metadata_path, properties)
def delete(self, uid):
metadata_path = layoutmanager.get_instance().get_metadata_path(uid)
for key in os.listdir(metadata_path):
os.remove(os.path.join(metadata_path, key))
os.rmdir(metadata_path)
def get_property(self, uid, key):
metadata_path = layoutmanager.get_instance().get_metadata_path(uid)
property_path = os.path.join(metadata_path, key)
if os.path.exists(property_path):
return open(property_path, 'r').read()
else:
return None
def set_property(self, uid, key, value):
metadata_path = layoutmanager.get_instance().get_metadata_path(uid)
property_path = os.path.join(metadata_path, key)
open(property_path, 'w').write(value)
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