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84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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sleekxmpp.xmlstream.handler.base
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Part of SleekXMPP: The Sleek XMPP Library
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:copyright: (c) 2011 Nathanael C. Fritz
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:license: MIT, see LICENSE for more details
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"""
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import weakref
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class BaseHandler(object):
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"""
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Base class for stream handlers. Stream handlers are matched with
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incoming stanzas so that the stanza may be processed in some way.
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Stanzas may be matched with multiple handlers.
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Handler execution may take place in two phases: during the incoming
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stream processing, and in the main event loop. The :meth:`prerun()`
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method is executed in the first case, and :meth:`run()` is called
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during the second.
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:param string name: The name of the handler.
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:param matcher: A :class:`~sleekxmpp.xmlstream.matcher.base.MatcherBase`
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derived object that will be used to determine if a
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stanza should be accepted by this handler.
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:param stream: The :class:`~sleekxmpp.xmlstream.xmlstream.XMLStream`
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instance that the handle will respond to.
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"""
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def __init__(self, name, matcher, stream=None):
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#: The name of the handler
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self.name = name
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#: The XML stream this handler is assigned to
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self.stream = None
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if stream is not None:
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self.stream = weakref.ref(stream)
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stream.register_handler(self)
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self._destroy = False
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self._payload = None
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self._matcher = matcher
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def match(self, xml):
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"""Compare a stanza or XML object with the handler's matcher.
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:param xml: An XML or
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:class:`~sleekxmpp.xmlstream.stanzabase.ElementBase` object
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"""
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return self._matcher.match(xml)
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def prerun(self, payload):
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"""Prepare the handler for execution while the XML
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stream is being processed.
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:param payload: A :class:`~sleekxmpp.xmlstream.stanzabase.ElementBase`
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object.
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"""
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self._payload = payload
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def run(self, payload):
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"""Execute the handler after XML stream processing and during the
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main event loop.
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:param payload: A :class:`~sleekxmpp.xmlstream.stanzabase.ElementBase`
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object.
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"""
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self._payload = payload
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def check_delete(self):
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"""Check if the handler should be removed from the list
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of stream handlers.
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"""
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return self._destroy
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# To comply with PEP8, method names now use underscores.
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# Deprecated method names are re-mapped for backwards compatibility.
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BaseHandler.checkDelete = BaseHandler.check_delete
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