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"""Base classes for formatters.
"""
import abc
class Formatter(object):
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def add_argument_group(self, parser):
"""Add any options to the argument parser.
Should use our own argument group.
"""
class ListFormatter(Formatter):
"""Base class for formatters that know how to deal with multiple objects.
"""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def emit_list(self, column_names, data, stdout, parsed_args):
"""Format and print the list from the iterable data source.
: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
"""
class SingleFormatter(Formatter):
"""Base class for formatters that work with single objects.
"""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def emit_one(self, column_names, data, stdout, parsed_args):
"""Format and print the values associated with the single object.
: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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