189 lines
7.9 KiB
Python
189 lines
7.9 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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from services.primitives.boolean_type import Boolean
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from typing import Optional
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def get_attr_link_name(class_name: str, attr_name: str):
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return f"{class_name}_{attr_name}"
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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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return self._create_object(name, class_node)
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def _create_object(self, name: str, class_node: UUID):
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# Look at our `type_model` as if it's an object diagram:
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mm_od = OD(
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get_scd_mm(self.bottom), # the type model of our type model
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self.type_model,
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self.bottom.state)
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# # Read the 'abstract' slot of the class
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abstract_slot = mm_od.get_slot(class_node, "abstract")
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print('abstract_slot:', abstract_slot)
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if abstract_slot != None:
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is_abstract = Boolean(abstract_slot, self.bottom.state).read()
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else:
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is_abstract = False
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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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return self._get_class_of_object(object_node)
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def _get_class_of_object(self, object_node: UUID):
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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 = get_attr_link_name(class_name, attr_name)
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print('attr_link_name:', attr_link_name)
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# An attribute-link is indistinguishable from an ordinary link:
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return self.create_link(
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get_attr_link_name(object_name, attr_name),
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attr_link_name, object_name, target_name)
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def get_slot(self, object_node: UUID, attr_name: str):
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# I really don't like how complex and inefficient it is to read an attribute of an object...
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class_name = self._get_class_of_object(object_node)
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attr_link_name = get_attr_link_name(class_name, attr_name)
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print(attr_link_name)
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type_edge, = self.bottom.read_outgoing_elements(self.type_model, attr_link_name)
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for outgoing_edge in self.bottom.read_outgoing_edges(object_node):
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if type_edge in self.bottom.read_outgoing_elements(outgoing_edge, "Morphism"):
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slot_ref = self.bottom.read_edge_target(outgoing_edge)
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slot_node = UUID(self.bottom.read_value(slot_ref))
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return slot_node
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def create_integer_value(self, name: str, 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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def create_string_value(self, name: str, value: str):
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from services.primitives.string_type import String
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string_node = self.bottom.create_node()
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string_t = String(string_node, self.bottom.state)
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string_t.create(value)
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# name = '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, "String", string_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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type_node, = self.bottom.read_outgoing_elements(self.type_model, type_name) # retrieve type
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self.bottom.create_edge(element_node, type_node, "Morphism") # create morphism link
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def create_link(self, link_name: Optional[str], 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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# generate a unique name for the link
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if link_name == None:
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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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print('link_name:', link_name)
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type_edge, = self.bottom.read_outgoing_elements(self.type_model, assoc_name)
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return self._create_link(link_name, type_edge, src_obj_node, tgt_obj_node)
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def _create_link(self, link_name: str, type_edge: str, src_obj_node: UUID, tgt_obj_node: UUID):
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# the link itself is unlabeled:
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link_edge = self.bottom.create_edge(src_obj_node, tgt_obj_node)
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# it is only in the context of the model, that the link has a name:
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self.bottom.create_edge(self.model, link_edge, link_name) # add to model
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self.bottom.create_edge(link_edge, type_edge, "Morphism")
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return link_edge
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def get_types(bottom: Bottom, obj: UUID):
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return bottom.read_outgoing_elements(obj, "Morphism")
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def get_type(bottom: Bottom, obj: UUID):
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types = get_types(bottom, obj)
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if len(types) == 1:
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return types[0]
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elif len(types) > 1:
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raise Exception(f"Expected at most one type. Instead got {len(types)}.")
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def is_typed_by(bottom, el: UUID, typ: UUID):
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for typed_by in get_types(bottom, el):
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if typed_by == typ:
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return True
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return False
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def get_scd_mm(bottom):
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scd_metamodel_id = bottom.state.read_dict(bottom.state.read_root(), "SCD")
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scd_metamodel = UUID(bottom.state.read_value(scd_metamodel_id))
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return scd_metamodel
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def get_scd_mm_class_node(bottom: Bottom):
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return get_scd_mm_node(bottom, "Class")
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def get_scd_mm_attributelink_node(bottom: Bottom):
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return get_scd_mm_node(bottom, "AttributeLink")
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def get_scd_mm_assoc_node(bottom: Bottom):
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return get_scd_mm_node(bottom, "Association")
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def get_scd_mm_modelref_node(bottom: Bottom):
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return get_scd_mm_node(bottom, "ModelRef")
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def get_scd_mm_node(bottom: Bottom, node_name: str):
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scd_metamodel = get_scd_mm(bottom)
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node, = bottom.read_outgoing_elements(scd_metamodel, node_name)
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return node
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def get_object_name(bottom: Bottom, model: UUID, object_node: UUID):
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for key in bottom.read_keys(model):
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for el in bottom.read_outgoing_elements(model, key):
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if el == object_node:
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return key
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