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annotate env/lib/python3.9/site-packages/rdflib/events.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import
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2 from __future__ import division
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3 from __future__ import print_function
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4
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5 __doc__ = """
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6 Dirt Simple Events
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7
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8 A Dispatcher (or a subclass of Dispatcher) stores event handlers that
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9 are 'fired' simple event objects when interesting things happen.
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10
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11 Create a dispatcher:
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12
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13 >>> d = Dispatcher()
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14
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15 Now create a handler for the event and subscribe it to the dispatcher
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16 to handle Event events. A handler is a simple function or method that
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17 accepts the event as an argument:
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18
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19 >>> def handler1(event): print(repr(event))
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20 >>> d.subscribe(Event, handler1)
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21
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22 Now dispatch a new event into the dispatcher, and see handler1 get
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23 fired:
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24
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25 >>> d.dispatch(Event(foo='bar', data='yours', used_by='the event handlers'))
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26 <rdflib.events.Event ['data', 'foo', 'used_by']>
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27 """
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28
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29 __all__ = ['Event', 'Dispatcher']
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30
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31
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32 class Event(object):
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33 """
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34 An event is a container for attributes. The source of an event
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35 creates this object, or a subclass, gives it any kind of data that
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36 the events handlers need to handle the event, and then calls
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37 notify(event).
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38
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39 The target of an event registers a function to handle the event it
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40 is interested with subscribe(). When a sources calls
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41 notify(event), each subscriber to that event will be called in no
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42 particular order.
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43 """
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44
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45 def __init__(self, **kw):
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46 self.__dict__.update(kw)
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47
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48 def __repr__(self):
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49 attrs = sorted(self.__dict__.keys())
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50 return '<rdflib.events.Event %s>' % ([a for a in attrs],)
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51
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52
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53 class Dispatcher(object):
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54 """
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55 An object that can dispatch events to a privately managed group of
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56 subscribers.
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57 """
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58
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59 _dispatch_map = None
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60
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61 def set_map(self, amap):
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62 self._dispatch_map = amap
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63
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64 def get_map(self):
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65 return self._dispatch_map
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66
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67 def subscribe(self, event_type, handler):
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68 """ Subscribe the given handler to an event_type. Handlers
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69 are called in the order they are subscribed.
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70 """
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71 if self._dispatch_map is None:
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72 self.set_map({})
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73 lst = self._dispatch_map.get(event_type, None)
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74 if lst is None:
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75 lst = [handler]
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76 else:
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77 lst.append(handler)
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78 self._dispatch_map[event_type] = lst
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79
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80 def dispatch(self, event):
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81 """ Dispatch the given event to the subscribed handlers for
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82 the event's type"""
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83 if self._dispatch_map is not None:
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84 lst = self._dispatch_map.get(type(event), None)
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85 if lst is None:
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86 raise ValueError("unknown event type: %s" % type(event))
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87 for l in lst:
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88 l(event)
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89
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90
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91 def test():
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92 import doctest
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93 doctest.testmod()
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94
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95
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96 if __name__ == '__main__':
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97 test()