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# -*- coding: utf-8
__author__="lreqc"
__date__ ="$2009-07-14 01:04:28$"
class Resolver(object):
__by_ID_in = {}
__by_ID_out = {}
__by_class = {}
__by_name = {}
@classmethod
def packet(cls, id, is_out):
def decorator(pcls):
dict = cls.__by_ID_out if is_out else cls.__by_ID_in
conflict = dict.get(id, None)
if conflict is not None:
raise ValueError("ID %d for packet %s conflicts with %s" \
% (id,pcls.__name__,conflict.__name__) )
if dict.has_key(pcls):
raise ValueError("Every class can have only ONE ID.")
dict[id] = pcls
cls.__by_class[pcls] = (id, is_out)
cls.__by_name[pcls.__name__] = pcls
pcls.packet_id = id
return pcls
return decorator
@classmethod
def list_packets(cls):
print "Listing packets:"
for (klass, (id, is_out)) in sorted(cls.__by_class.iteritems(), key=lambda k: (k[1][1],k[1][0])):
print klass.__name__, hex(id), "(%s)" % (is_out and "OUT" or "IN")
@classmethod
def by_name(cls, name):
return cls.__by_name[name]
@classmethod
def by_IDi(cls, id):
return cls.__by_ID_in[id]
@classmethod
def by_IDo(cls, id):
return cls.__by_ID_out[id]
def inpacket(id):
return Resolver.packet(id, False)
def outpacket(id):
return Resolver.packet(id, True)
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