99 lines
4.1 KiB
Python
99 lines
4.1 KiB
Python
from uuid import UUID
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from state.base import State
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from services.bottom.V0 import Bottom
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from services.primitives.integer_type import Integer
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from services.primitives.string_type import String
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# Object Diagrams service
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class OD:
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def __init__(self, type_model: UUID, model: UUID, state: State):
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"""
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Implements services for the object diagrams LTM.
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Implementation is done in terms of services provided by LTM-bottom.
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Args:
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type_model: The SCD-conforming class diagram that contains the types of this object diagram
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model: UUID of the (OD) model to manipulate
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"""
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self.type_model = type_model
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self.model = model
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self.bottom = Bottom(state)
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def create_object(self, name: str, class_name: str):
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class_node, = self.bottom.read_outgoing_elements(self.type_model, class_name)
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abstract_nodes = self.bottom.read_outgoing_elements(self.type_model, f"{class_name}.abstract")
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if len(abstract_nodes) == 1:
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is_abstract = self.bottom.read_value(abstract_node)
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else:
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# 'abstract' is optional attribute, default is False
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is_abstract = False
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print("class", name, "is abstract?", is_abstract)
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if is_abstract:
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raise Exception("Cannot instantiate abstract class!")
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object_node = self.bottom.create_node()
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self.bottom.create_edge(self.model, object_node, name) # attach to model
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self.bottom.create_edge(object_node, class_node, "Morphism") # typed-by link
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return object_node
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def get_class_of_object(self, object_name: str):
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object_node, = self.bottom.read_outgoing_elements(self.model, object_name) # get the object
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type_el, = self.bottom.read_outgoing_elements(object_node, "Morphism")
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for key in self.bottom.read_keys(self.type_model):
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type_el2, = self.bottom.read_outgoing_elements(self.type_model, key)
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if type_el == type_el2:
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return key
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def create_slot(self, attr_name: str, object_name: str, target_name: str):
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class_name = self.get_class_of_object(object_name)
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attr_link_name = f"{class_name}_{attr_name}"
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# An attribute-link is indistinguishable from an ordinary link:
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return self.create_link(attr_link_name, object_name, target_name)
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def create_integer_value(self, value: int):
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from services.primitives.integer_type import Integer
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int_node = self.bottom.create_node()
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integer_t = Integer(int_node, self.bottom.state)
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integer_t.create(value)
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name = 'int'+str(value) # name of the ref to the created integer
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# By convention, the type model must have a ModelRef named "Integer"
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self.create_model_ref(name, "Integer", int_node)
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return name
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# Identical to the same SCD method:
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def create_model_ref(self, name: str, type_name: str, model: UUID):
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# create element + morphism links
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element_node = self.bottom.create_node(str(model)) # create element node
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self.bottom.create_edge(self.model, element_node, name) # attach to model
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scd_node, = self.bottom.read_outgoing_elements(self.type_model, type_name) # retrieve type
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self.bottom.create_edge(element_node, scd_node, "Morphism") # create morphism link
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def create_link(self, assoc_name: str, src_obj_name: str, tgt_obj_name: str):
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src_obj_node, = self.bottom.read_outgoing_elements(self.model, src_obj_name)
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tgt_obj_node, = self.bottom.read_outgoing_elements(self.model, tgt_obj_name)
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link_edge = self.bottom.create_edge(src_obj_node, tgt_obj_node);
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# generate a unique name for the link
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i = 0;
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while True:
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link_name = f"{assoc_name}{i}"
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if len(self.bottom.read_outgoing_elements(self.model, link_name)) == 0:
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break
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i += 1
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self.bottom.create_edge(self.model, link_edge, link_name)
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type_edge, = self.bottom.read_outgoing_elements(self.type_model, assoc_name)
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self.bottom.create_edge(link_edge, type_edge, "Morphism")
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