# Copyright (C) Nov 2020 Mellanox Technologies Ltd. All rights reserved.
#
# This software is available to you under a choice of one of two
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# General Public License (GPL) Version 2, available from the file
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# OpenIB.org BSD license below:
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#     without modification, are permitted provided that the following
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#      - Redistributions of source code must retain the above
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# --

import os
from collections.abc import Iterable
from errno import ENOENT

from ..factory import Product, FactoryMeta

__all__ = ['PacketLoader']


class PacketLoader(Iterable, Product, metaclass=FactoryMeta):
    """An abstract class that represents packet loader.

    :param str path: The path to a file which contains packets
    """
    def __init__(self, path, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.path = path

    def load(self):
        """Loads a list of packets from a file.

        :return: A list of packets.
        :rtype: list[Packet]
        """
        return [packet for packet in self]

    @property
    def path(self):
        """The path to an input file.

        :getter: Gets the path to an input file
        :setter: Sets the path to an input file
        :type: str
        """
        return self._path

    @path.setter
    def path(self, path):
        if os.path.isfile(path) is False:
            raise FileNotFoundError(ENOENT, os.strerror(ENOENT), path)
        self._path = path