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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.
from ...utils.openclose import OpenClose
from .exceptions import ReaderException, AlreadyReadException
class Reader(object):
"""
Base class for ARIA readers.
Readers provide agnostic raw data by consuming :class:`aria.parser.loading.Loader` instances.
"""
def __init__(self, context, location, loader):
self.context = context
self.location = location
self.loader = loader
def load(self):
with OpenClose(self.loader) as loader:
if self.context is not None:
with self.context._locations:
for location in self.context._locations:
if location.is_equivalent(loader.location):
raise AlreadyReadException('already read: %s' % loader.location)
self.context._locations.append(loader.location)
data = loader.load()
if data is None:
raise ReaderException('loader did not provide data: %s' % loader)
return data
def read(self):
raise NotImplementedError
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