def retrieve_dependency_graph(specification,
exact_match=False,
factory=None):
"""
Gets the best matching generator from a dependency graph generator factory
and retrieve the dependency from it.
@param specification: A specification
@param exact_match: the parameter is passed to the factory.
@param factory: The dependency graph factory to be used. If None, the dependency graph
factory is retrieved from the configuration.
@type factory: DependencyGraphGeneratorFactory or NoneType
"""
if factory == None:
factory = config_dependency_graph_factory
assert isinstance(factory, DependencyGraphGeneratorFactory)
assert isinstance(specification, DependencyGraphSpecification)
generator = IterTools.first(
factory.get_dependency_graph_generators(specification,
max_count=1))
if generator:
assert isinstance(generator, DependencyGraphGenerator)
return generator.retrieve_graph()
else:
return None
def test_first(self):
testee = (x for x in range(2))
self.assertEquals(0, IterTools.first(testee))
self.assertEquals(1, IterTools.first(testee))
self.assertRaises(StopIteration, IterTools.first, testee)
self.assertEquals(0, IterTools.first(testee, 0))