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annotate planemo/lib/python3.7/site-packages/rdflib/events.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 __doc__ = """
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2 Dirt Simple Events
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3
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4 A Dispatcher (or a subclass of Dispatcher) stores event handlers that
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5 are 'fired' simple event objects when interesting things happen.
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6
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7 Create a dispatcher:
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8
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9 >>> d = Dispatcher()
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10
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11 Now create a handler for the event and subscribe it to the dispatcher
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12 to handle Event events. A handler is a simple function or method that
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13 accepts the event as an argument:
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14
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15 >>> def handler1(event): print(repr(event))
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16 >>> d.subscribe(Event, handler1)
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17
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18 Now dispatch a new event into the dispatcher, and see handler1 get
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19 fired:
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20
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21 >>> d.dispatch(Event(foo='bar', data='yours', used_by='the event handlers'))
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22 <rdflib.events.Event ['data', 'foo', 'used_by']>
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23 """
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24
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25 __all__ = ['Event', 'Dispatcher']
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26
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27
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28 class Event(object):
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29 """
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30 An event is a container for attributes. The source of an event
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31 creates this object, or a subclass, gives it any kind of data that
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32 the events handlers need to handle the event, and then calls
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33 notify(event).
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34
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35 The target of an event registers a function to handle the event it
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36 is interested with subscribe(). When a sources calls
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37 notify(event), each subscriber to that event will be called in no
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38 particular order.
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39 """
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40
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41 def __init__(self, **kw):
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42 self.__dict__.update(kw)
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43
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44 def __repr__(self):
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45 attrs = list(self.__dict__.keys())
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46 attrs.sort()
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47 return '<rdflib.events.Event %s>' % ([a for a in attrs],)
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48
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49
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50 class Dispatcher(object):
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51 """
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52 An object that can dispatch events to a privately managed group of
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53 subscribers.
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54 """
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55
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56 _dispatch_map = None
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57
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58 def set_map(self, amap):
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59 self._dispatch_map = amap
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60
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61 def get_map(self):
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62 return self._dispatch_map
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63
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64 def subscribe(self, event_type, handler):
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65 """ Subscribe the given handler to an event_type. Handlers
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66 are called in the order they are subscribed.
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67 """
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68 if self._dispatch_map is None:
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69 self.set_map({})
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70 lst = self._dispatch_map.get(event_type, None)
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71 if lst is None:
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72 lst = [handler]
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73 else:
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74 lst.append(handler)
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75 self._dispatch_map[event_type] = lst
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76
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77 def dispatch(self, event):
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78 """ Dispatch the given event to the subscribed handlers for
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79 the event's type"""
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80 if self._dispatch_map is not None:
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81 lst = self._dispatch_map.get(type(event), None)
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82 if lst is None:
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83 raise ValueError("unknown event type: %s" % type(event))
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84 for l in lst:
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85 l(event)
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86
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87
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88 def test():
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89 import doctest
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90 doctest.testmod()
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91
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92 if __name__ == '__main__':
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93 test()