JezK

Edit File: rdataclass.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2001-2017 Nominum, Inc.
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"""DNS Rdata Classes."""

import dns.enum
import dns.exception

class RdataClass(dns.enum.IntEnum):
    """DNS Rdata Class"""

RESERVED0 = 0
    IN = 1
    INTERNET = IN
    CH = 3
    CHAOS = CH
    HS = 4
    HESIOD = HS
    NONE = 254
    ANY = 255

@classmethod
    def _maximum(cls):
        return 65535

@classmethod
    def _short_name(cls):
        return "class"

@classmethod
    def _prefix(cls):
        return "CLASS"

@classmethod
    def _unknown_exception_class(cls):
        return UnknownRdataclass

_metaclasses = {RdataClass.NONE, RdataClass.ANY}

class UnknownRdataclass(dns.exception.DNSException):
    """A DNS class is unknown."""

def from_text(text: str) -> RdataClass:
    """Convert text into a DNS rdata class value.

The input text can be a defined DNS RR class mnemonic or
    instance of the DNS generic class syntax.

For example, "IN" and "CLASS1" will both result in a value of 1.

Raises ``dns.rdatatype.UnknownRdataclass`` if the class is unknown.

Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.

Returns a ``dns.rdataclass.RdataClass``.
    """

return RdataClass.from_text(text)

def to_text(value: RdataClass) -> str:
    """Convert a DNS rdata class value to text.

If the value has a known mnemonic, it will be used, otherwise the
    DNS generic class syntax will be used.

Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.

Returns a ``str``.
    """

return RdataClass.to_text(value)

def is_metaclass(rdclass: RdataClass) -> bool:
    """True if the specified class is a metaclass.

The currently defined metaclasses are ANY and NONE.

*rdclass* is a ``dns.rdataclass.RdataClass``.
    """

if rdclass in _metaclasses:
        return True
    return False

### BEGIN generated RdataClass constants

RESERVED0 = RdataClass.RESERVED0
IN = RdataClass.IN
INTERNET = RdataClass.INTERNET
CH = RdataClass.CH
CHAOS = RdataClass.CHAOS
HS = RdataClass.HS
HESIOD = RdataClass.HESIOD
NONE = RdataClass.NONE
ANY = RdataClass.ANY

### END generated RdataClass constants