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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.
"""Base classes for formatters.
"""
import abc
import six
@six.add_metaclass(abc.ABCMeta)
class Formatter(object):
@abc.abstractmethod
def add_argument_group(self, parser):
"""Add any options to the argument parser.
Should use our own argument group.
"""
@six.add_metaclass(abc.ABCMeta)
class ListFormatter(Formatter):
"""Base class for formatters that know how to deal with multiple objects.
"""
@abc.abstractmethod
def emit_list(self, column_names, data, stdout, parsed_args):
"""Format and print the list from the iterable data source.
Data values can be primitive types like ints and strings, or
can be an instance of a :class:`FormattableColumn` for
situations where the value is complex, and may need to be
handled differently for human readable output vs. machine
readable output.
:param column_names: names of the columns
:param data: iterable data source, one tuple per object
with values in order of column names
:param stdout: output stream where data should be written
:param parsed_args: argparse namespace from our local options
"""
@six.add_metaclass(abc.ABCMeta)
class SingleFormatter(Formatter):
"""Base class for formatters that work with single objects.
"""
@abc.abstractmethod
def emit_one(self, column_names, data, stdout, parsed_args):
"""Format and print the values associated with the single object.
Data values can be primitive types like ints and strings, or
can be an instance of a :class:`FormattableColumn` for
situations where the value is complex, and may need to be
handled differently for human readable output vs. machine
readable output.
:param column_names: names of the columns
:param data: iterable data source with values in order of column names
:param stdout: output stream where data should be written
:param parsed_args: argparse namespace from our local options
"""
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