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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2018 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
import datetime
from construct import *
class AffineAdapter(Adapter):
def __init__(self, c, a, *args, **kwargs):
self.c = c
self.a = a
return Adapter.__init__(self, *args, **kwargs)
def _encode(self, obj, context, path=None):
return int(round(obj * self.c + self.a))
def _decode(self, obj, context, path=None):
return (float(obj) - self.a) / self.c
class LinearAdapter(AffineAdapter):
def __init__(self, c, *args, **kwargs):
return AffineAdapter.__init__(self, c, 0, *args, **kwargs)
class PolynomialAdapter(Adapter):
def __init__(self, coeffs, *args, **kwargs):
self.c = coeffs
return Adapter.__init__(self, *args, **kwargs)
def _encode(self, obj, context, path=None):
raise NotImplementedError
def _decode(self, obj, context, path=None):
x = float(obj)
return sum([c * (x ** i) for i, c in enumerate(self.c)])
class UNIXTimestampAdapter(Adapter):
def _encode(self, obj, context, path=None):
return round(obj.timestamp())
def _decode(self, obj, context, path=None):
return datetime.datetime.utcfromtimestamp(obj)
class TableAdapter(Adapter):
def __init__(self, table, *args, **kwargs):
self.table = table
return Adapter.__init__(self, *args, **kwargs)
def _encode(self, obj, context, path=None):
try:
return self.table.index(obj)
except ValueError:
return None
def _decode(self, obj, context, path=None):
try:
return self.table[obj]
except IndexError:
return None
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