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hegner |
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# decorator for adding iterators to container like objects
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# NOTE: EventBranch._readData has to be taken care of at another place!
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#import cmserror
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def addIterator(obj):
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"""function for adding iterators to objects"""
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if not hasattr(obj, "__iter__"):
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if hasattr(obj, "size"):
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obj.__iter__ = iteratorForSizedObjects
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else:
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begin, end = _findIterators(obj)
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if not hasattr(obj, "_begin") and hasattr(obj, "_end"):
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obj._begin = begin
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obj._end = end
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obj.__iter__ = iteratorForBeginEnd
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#else:
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# obj.__iter__ = EmptyIterator
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return obj
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def iteratorForSizedObjects(self):
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"""dynamically added iterator"""
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entries = container.size()
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for entry in xrange(entries):
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yield obj[entry]
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def iteratorForBeginEnd(self):
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"""dynamically added iterator"""
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it = self._begin
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while (it != end):
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yield begin.__deref__() #*b
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begin.__preinc__() #++b
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def emptyIterator(self):
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"""empty iterator"""
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raise cmserror("Automatic iterator search failed for %s. Either it is no iterable or it has multiple iterator possibilites. Please use loop(begin, end) instead." %obj )
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# automatic detection of iterators.
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def _findIterators(obj):
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objDict = obj.__dict__
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_beginNames = [name for name in objDict.keys() if "begin" in
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name.lower()]
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_endNames = [name for name in objDict.keys() if "end" in name.lower()]
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if len(_beginNames)==1 and len(_endNames)== 1 and _beginNames[0].lower().replace("begin","") == _endNames[0].lower().replace("end",""):
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return objDict[_beginNames[0]], objDict[_endNames[0]]
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else:
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return False
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##########################
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if __name__ == "__main__":
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import unittest
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class TestIterators(unittest.TestCase):
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def testFindIterators(self):
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class A(object):
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pass
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a = A()
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a.BeGin_foo = 1
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a.EnD_foo = 100
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self.assertEqual(_findIterators(a),(1,100))
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a.begin_bar = 1
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a.end_bar = 100
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self.failIf(_findIterators(a))
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def testAddIterator(self):
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# test for size types
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class A(object):
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size = 3
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a = A()
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a = addIterator(a)
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self.assert_(hasattr(a, "__iter__"))
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# test if __iter__ already there
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class B(object):
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def __iter__(self):
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return True
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b = B()
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b = addIterator(b)
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self.assert_(b.__iter__())
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unittest.main()
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