97 lines
2.9 KiB
Python
97 lines
2.9 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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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. The first is during
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the stream processing itself. The second is after stream processing
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and during SleekXMPP's main event loop. The prerun method is used
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for execution during stream processing, and the run method is used
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during the main event loop.
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Attributes:
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name -- The name of the handler.
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stream -- The stream this handler is assigned to.
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Methods:
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match -- Compare a stanza with the handler's matcher.
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prerun -- Handler execution during stream processing.
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run -- Handler execution during the main event loop.
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check_delete -- Indicate if the handler may be removed from use.
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"""
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def __init__(self, name, matcher, stream=None):
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"""
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Create a new stream handler.
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Arguments:
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name -- The name of the handler.
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matcher -- A matcher object from xmlstream.matcher that will be
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used to determine if a stanza should be accepted by
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this handler.
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stream -- The XMLStream instance the handler should monitor.
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"""
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self.name = name
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if stream is not None:
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self.stream = weakref.ref(stream)
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else:
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self.stream = None
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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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if stream is not None:
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stream.registerHandler(self)
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def match(self, xml):
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"""
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Compare a stanza or XML object with the handler's matcher.
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Arguments
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xml -- An XML or stanza 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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"""
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Prepare the handler for execution while the XML stream is being
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processed.
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Arguments:
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payload -- A stanza object.
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"""
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self._payload = payload
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def run(self, payload):
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"""
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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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Arguments:
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payload -- A stanza object.
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"""
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self._payload = payload
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def check_delete(self):
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"""
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Check if the handler should be removed from the list of stream
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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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