53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
# Copyright 2015 Canonical, Ltd.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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""" Model Policy
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"""
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from abc import ABC, abstractmethod
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class BaseModel(ABC):
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"""Expected contract for defining models. """
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# Exposed emitter signals
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signals = []
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# Back navigation
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prev_signal = None
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@abstractmethod
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def get_signal_by_name(self, *args, **kwargs):
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"""Implements a getter for retrieving signals exposed by the model."""
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pass
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@abstractmethod
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def get_signals(self):
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""" Lists available signals for model
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Should return a list with a tuple format of
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[('Name of item', 'signal-name', 'callback function string')]
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"""
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pass
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@abstractmethod
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def get_menu(self):
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""" Returns a list of menu items
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Should return a list with a tuple format the same
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as get_signals()
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"""
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pass
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