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+# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
+
+# Copyright (C) 2001-2017 Nominum, Inc.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose with or without fee is hereby granted,
+# provided that the above copyright notice and this permission notice
+# appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""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