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# slixmpp.xmlstream.handler.base
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Part of Slixmpp: The Slick XMPP Library
# :copyright: (c) 2011 Nathanael C. Fritz
# :license: MIT, see LICENSE for more details
import weakref
class BaseHandler(object):
"""
Base class for stream handlers. Stream handlers are matched with
incoming stanzas so that the stanza may be processed in some way.
Stanzas may be matched with multiple handlers.
Handler execution may take place in two phases: during the incoming
stream processing, and in the main event loop. The :meth:`prerun()`
method is executed in the first case, and :meth:`run()` is called
during the second.
:param string name: The name of the handler.
:param matcher: A :class:`~slixmpp.xmlstream.matcher.base.MatcherBase`
derived object that will be used to determine if a
stanza should be accepted by this handler.
:param stream: The :class:`~slixmpp.xmlstream.xmlstream.XMLStream`
instance that the handle will respond to.
"""
def __init__(self, name, matcher, stream=None):
#: The name of the handler
self.name = name
#: The XML stream this handler is assigned to
self.stream = None
if stream is not None:
self.stream = weakref.ref(stream)
stream.register_handler(self)
self._destroy = False
self._payload = None
self._matcher = matcher
def match(self, xml):
"""Compare a stanza or XML object with the handler's matcher.
:param xml: An XML or
:class:`~slixmpp.xmlstream.stanzabase.ElementBase` object
"""
return self._matcher.match(xml)
def prerun(self, payload):
"""Prepare the handler for execution while the XML
stream is being processed.
:param payload: A :class:`~slixmpp.xmlstream.stanzabase.ElementBase`
object.
"""
self._payload = payload
def run(self, payload):
"""Execute the handler after XML stream processing and during the
main event loop.
:param payload: A :class:`~slixmpp.xmlstream.stanzabase.ElementBase`
object.
"""
self._payload = payload
def check_delete(self):
"""Check if the handler should be removed from the list
of stream handlers.
"""
return self._destroy
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