class TestEventManager(unittest.TestCase):
""" Class for testing event.EventManager from cspy """
def setUp(self):
""" Prepare the test """
self.e_mgr = EventManager()
def test_singleton(self):
""" Design pattern implemented correctly? """
self.assertEqual(self.e_mgr._Singleton__instance, EventManager()._Singleton__instance)
def test_subscription(self):
""" Events are created correctly a recieved? """
def function(**kwargs):
""" Test function """
self.assertEqual(1, kwargs['test'])
self.e_mgr.register_event('test_event')
self.e_mgr.subscribe('test_event', function)
self.e_mgr.raise_event('test_event', test=1)
class SolverVariable():
""" Varible class for cspy Solver. Each Variable has a domain. When a variable
is set an unique event is raised.
"""
def __init__(self, id, domain):
""" Init method """
self.id = id
self.instancied = False
self.event_name = "%s_on_set_value" % id
self.e_mgr = EventManager()
self.e_mgr.register_event(self.event_name)
if len(domain) == 0:
raise BTException()
self.domain = domain
if len(domain) == 1:
self.set(domain[0])
else:
self.value = None
def _restore(self, domain):
""" Restore domain to a previous domain """
self.domain = domain
if len(domain) > 1:
self.instancied = False
self.value = None
def set(self, val):
""" Set the value to val and raise a event """
self.domain = [val]
self.value = val
self.instancied = True
self.e_mgr.raise_event(self.event_name, id=self.id, value=val)
def remove_from_domain(self, values):
""" Remove values from domain. If domain had more than one value
and after remove only have one the variable become set.
"""
# len before removing
domain_len = len(self.domain)
for value in values:
if self.in_domain(value):
self.domain.remove(value)
# No values is an invalid states
if len(self.domain) == 0:
raise BTException()
# Now the variable is set
elif len(self.domain) == 1 and domain_len > 1:
self.set(self.domain[0])
def subscribe(self, function):
""" Subscribe to variable event """
self.e_mgr.subscribe(self.event_name, function)
def in_domain(self, value):
""" Is the value in the domain? """
return value in self.domain
def min(self):
""" Min posible value of the variable"""
return min(self.domain)
def max(self):
""" Max posible value of the variable"""
return max(self.domain)
def __str__(self):
""" String representation of the variable """
return str(self.domain)
