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# Copyright 2014 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import StringIO
import yaml
import distixlib
class MetadataSerialiser(object):
def serialise(self, metadata):
obj = self._create_python_object(metadata)
return self._create_yaml_text(obj)
def _create_python_object(self, metadata):
obj = {}
for key in metadata.keys():
obj[key] = sorted(metadata.get_all_values(key))
return obj
def _create_yaml_text(self, obj):
return yaml.safe_dump(obj, default_flow_style=False, indent=4)
def deserialise(self, text):
obj = self._parse_yaml_text(text)
return self._create_metadata(obj)
def _parse_yaml_text(self, text):
return yaml.safe_load(StringIO.StringIO(text))
def _create_metadata(self, obj):
metadata = distixlib.Metadata()
if obj:
for key in obj:
for value in obj[key]:
metadata.add(key, value)
return metadata
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