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import os
from olpc.datastore import layoutmanager
from olpc.datastore import metadatareader
MAX_SIZE = 256
class MetadataStore(object):
def store(self, uid, metadata):
dir_path = layoutmanager.get_instance().get_entry_path(uid)
if not os.path.exists(dir_path):
os.makedirs(dir_path)
metadata_path = os.path.join(dir_path, 'metadata')
if not os.path.exists(metadata_path):
os.makedirs(metadata_path)
else:
for key in os.listdir(metadata_path):
os.remove(os.path.join(metadata_path, key))
metadata['uid'] = uid
for key, value in metadata.items():
open(os.path.join(metadata_path, key), 'w').write(str(value))
def retrieve(self, uid, properties=None):
dir_path = layoutmanager.get_instance().get_entry_path(uid)
return metadatareader.retrieve(dir_path, properties)
def delete(self, uid):
dir_path = layoutmanager.get_instance().get_entry_path(uid)
metadata_path = os.path.join(dir_path, 'metadata')
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):
dir_path = layoutmanager.get_instance().get_entry_path(uid)
metadata_path = os.path.join(dir_path, 'metadata')
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):
dir_path = layoutmanager.get_instance().get_entry_path(uid)
metadata_path = os.path.join(dir_path, 'metadata')
property_path = os.path.join(metadata_path, key)
open(property_path, 'w').write(value)
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