def add_parallel_gateway(bpmn, counts):
from pm4py.objects.bpmn.obj import BPMN
counts.inc_para_gateways()
split_name = "parallel_" + str(counts.num_para_gateways) + "_split"
join_name = "parallel_" + str(counts.num_para_gateways) + "_join"
split = BPMN.ParallelGateway(name=split_name, gateway_direction=BPMN.Gateway.Direction.DIVERGING)
join = BPMN.ParallelGateway(name=join_name, gateway_direction=BPMN.Gateway.Direction.CONVERGING)
bpmn.add_node(split)
bpmn.add_node(join)
return bpmn, split, join, counts
def add_inclusive_gateway(bpmn, counts):
from pm4py.objects.bpmn.obj import BPMN
counts.inc_para_gateways()
split_name = "parallel_" + str(counts.num_para_gateways) + "_split"
join_name = "parallel_" + str(counts.num_para_gateways) + "_join"
split = BPMN.InclusiveGateway(name=split_name)
join = BPMN.InclusiveGateway(name=join_name)
bpmn.add_node(split)
bpmn.add_node(join)
return bpmn, split, join, counts
def apply(tree, parameters=None):
"""
Converts the process tree into a BPMN diagram
Parameters
--------------
tree
Process tree
parameters
Parameters of the algorithm
Returns
--------------
bpmn_graph
BPMN diagram
"""
from pm4py.objects.bpmn.obj import BPMN
counts = Counts()
bpmn = BPMN()
start_event = BPMN.StartEvent(name="start", isInterrupting=True)
end_event = BPMN.EndEvent(name="end")
bpmn.add_node(start_event)
bpmn.add_node(end_event)
bpmn, counts, _, _ = recursively_add_tree(tree, tree, bpmn, start_event,
end_event, counts, 0)
bpmn = delete_tau_transitions(bpmn, counts)
return bpmn
def add_task(bpmn, counts, label):
"""
Create a task with the specified label in the BPMN
"""
from pm4py.objects.bpmn.obj import BPMN
task = BPMN.Task(name=label)
bpmn.add_node(task)
return bpmn, task, counts
def add_tau_task(bpmn, counts):
"""
Create a task with the specified label in the BPMN
"""
from pm4py.objects.bpmn.obj import BPMN
counts.inc_tau_trans()
tau_name = "tau_" + str(counts.num_tau_trans)
tau_task = BPMN.Task(name=tau_name)
bpmn.add_node(tau_task)
counts.append_tau(tau_task)
return bpmn, tau_task, counts
def delete_tau_transitions(bpmn, counts):
from pm4py.objects.bpmn.obj import BPMN
for tau_tran in counts.tau_trans:
in_arcs = tau_tran.get_in_arcs()
out_arcs = tau_tran.get_out_arcs()
if len(in_arcs) > 1 or len(out_arcs) > 1:
raise Exception("Tau transition has more than one incoming or outgoing edge!")
if in_arcs and out_arcs:
out_flow = out_arcs[0]
in_flow = in_arcs[0]
source = in_flow.get_source()
target = out_flow.get_target()
bpmn.remove_flow(out_flow)
bpmn.remove_flow(in_flow)
bpmn.add_flow(BPMN.Flow(source, target))
else:
for in_flow in copy.copy(in_arcs):
bpmn.remove_flow(in_flow)
for out_flow in copy.copy(out_arcs):
bpmn.remove_flow(out_flow)
bpmn.remove_node(tau_tran)
return bpmn
def import_xml_tree_from_root(root):
"""
Imports a BPMN graph from (the root of) an XML tree
Parameters
-------------
root
Root of the tree
Returns
-------------
bpmn_graph
BPMN graph
"""
bpmn_graph = BPMN()
counts = Counts()
incoming_dict = {}
outgoing_dict = {}
nodes_dict = {}
nodes_bounds = {}
flow_info = {}
return parse_element(bpmn_graph, counts, root, [], incoming_dict, outgoing_dict, nodes_dict, nodes_bounds,
flow_info)
def parse_element(bpmn_graph, counts, curr_el, parents, incoming_dict, outgoing_dict, nodes_dict, nodes_bounds,
flow_info, process=None, node=None, bpmn_element=None, flow=None, rec_depth=0):
"""
Parses a BPMN element from the XML file
"""
tag = curr_el.tag.lower()
if tag.endswith("subprocess"): # subprocess invocation
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el.attrib else ""
subprocess = BPMN.SubProcess(id=curr_el.get("id"), name=name, process=process, depth=rec_depth)
bpmn_graph.add_node(subprocess)
node = subprocess
process = curr_el.get("id")
nodes_dict[process] = node
elif tag.endswith("process"): # process of the current subtree
process = curr_el.get("id")
bpmn_graph.set_process_id(process)
elif tag.endswith("shape"): # shape of a node, contains x,y,width,height information
bpmn_element = curr_el.get("bpmnElement")
elif tag.endswith("task"): # simple task object
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el.attrib else ""
#this_type = str(curr_el.tag)
#this_type = this_type[this_type.index("}") + 1:]
task = BPMN.Task(id=id, name=name, process=process)
bpmn_graph.add_node(task)
node = task
nodes_dict[id] = node
elif tag.endswith("startevent"): # start node starting the (sub)process
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el.attrib else ""
event_definitions = [child.tag.lower().replace("eventdefinition","") for child in curr_el if child.tag.lower().endswith("eventdefinition")]
if len(event_definitions) > 0:
event_type = event_definitions[0]
if event_type.endswith("message"):
start_event = BPMN.MessageStartEvent(id=curr_el.get("id"), name=name, process=process)
else: # TODO: expand functionality, support more start event types
start_event = BPMN.NormalStartEvent(id=curr_el.get("id"), name=name, process=process)
else:
start_event = BPMN.NormalStartEvent(id=curr_el.get("id"), name=name, process=process)
bpmn_graph.add_node(start_event)
node = start_event
nodes_dict[id] = node
elif tag.endswith("endevent"): # end node ending the (sub)process
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el.attrib else ""
event_definitions = [child.tag.lower().replace("eventdefinition","") for child in curr_el if child.tag.lower().endswith("eventdefinition")]
if len(event_definitions) > 0:
event_type = event_definitions[0]
if event_type.endswith("message"):
end_event = BPMN.MessageEndEvent(id=curr_el.get("id"), name=name, process=process)
elif event_type.endswith("terminate"):
end_event = BPMN.TerminateEndEvent(id=curr_el.get("id"), name=name, process=process)
elif event_type.endswith("error"):
end_event = BPMN.ErrorEndEvent(id=curr_el.get("id"), name=name, process=process)
elif event_type.endswith("cancel"):
end_event = BPMN.CancelEndEvent(id=curr_el.get("id"), name=name, process=process)
else: # TODO: expand functionality, support more start event types
end_event = BPMN.NormalEndEvent(id=curr_el.get("id"), name=name, process=process)
else:
end_event = BPMN.NormalEndEvent(id=curr_el.get("id"), name=name, process=process)
bpmn_graph.add_node(end_event)
node = end_event
nodes_dict[id] = node
elif tag.endswith("intermediatecatchevent"): # intermediate event that happens (externally) and can be catched
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el.attrib else ""
event_definitions = [child.tag.lower().replace("eventdefinition","") for child in curr_el if child.tag.lower().endswith("eventdefinition")]
if len(event_definitions) > 0:
event_type = event_definitions[0]
if event_type.endswith("message"):
intermediate_catch_event = BPMN.MessageIntermediateCatchEvent(id=curr_el.get("id"), name=name, process=process)
elif event_type.endswith("error"):
intermediate_catch_event = BPMN.ErrorIntermediateCatchEvent(id=curr_el.get("id"), name=name, process=process)
elif event_type.endswith("cancel"):
intermediate_catch_event = BPMN.CancelIntermediateCatchEvent(id=curr_el.get("id"), name=name, process=process)
else:
intermediate_catch_event = BPMN.IntermediateCatchEvent(id=curr_el.get("id"), name=name, process=process)
else:
intermediate_catch_event = BPMN.IntermediateCatchEvent(id=curr_el.get("id"), name=name, process=process)
bpmn_graph.add_node(intermediate_catch_event)
node = intermediate_catch_event
nodes_dict[id] = node
elif tag.endswith("intermediatethrowevent"): # intermediate event that is activated through the (sub)process
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el.attrib else ""
event_definitions = [child.tag.lower().replace("eventdefinition","") for child in curr_el if child.tag.lower().endswith("eventdefinition")]
if len(event_definitions) > 0:
event_type = event_definitions[0]
if event_type.endswith("message"):
intermediate_throw_event = BPMN.MessageIntermediateThrowEvent(id=curr_el.get("id"), name=name, process=process)
else:
intermediate_throw_event = BPMN.NormalIntermediateThrowEvent(id=curr_el.get("id"), name=name, process=process)
else:
intermediate_throw_event = BPMN.NormalIntermediateThrowEvent(id=curr_el.get("id"), name=name, process=process)
bpmn_graph.add_node(intermediate_throw_event)
node = intermediate_throw_event
nodes_dict[id] = node
elif tag.endswith("boundaryevent"):
id = curr_el.get("id")
ref_activity = curr_el.get("attachedToRef")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el.attrib else ""
event_definitions = [child.tag.lower().replace("eventdefinition","") for child in curr_el if child.tag.lower().endswith("eventdefinition")]
if len(event_definitions) > 0:
event_type = event_definitions[0]
if event_type.endswith("message"):
boundary_event = BPMN.MessageBoundaryEvent(id=curr_el.get("id"), name=name, process=process, activity=ref_activity)
elif event_type.endswith("error"):
boundary_event = BPMN.ErrorBoundaryEvent(id=curr_el.get("id"), name=name, process=process, activity=ref_activity)
elif event_type.endswith("cancel"):
boundary_event = BPMN.CancelBoundaryEvent(id=curr_el.get("id"), name=name, process=process, activity=ref_activity)
else:
boundary_event = BPMN.BoundaryEvent(id=curr_el.get("id"), name=name, process=process, activity=ref_activity)
else:
boundary_event = BPMN.BoundaryEvent(id=curr_el.get("id"), name=name, process=process, activity=ref_activity)
bpmn_graph.add_node(boundary_event)
node = boundary_event
nodes_dict[id] = node
elif tag.endswith("edge"): # related to the x, y information of an arc
bpmnElement = curr_el.get("bpmnElement")
flow = bpmnElement
elif tag.endswith("exclusivegateway"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el.attrib else ""
try:
direction = BPMN.Gateway.Direction[curr_el.get("gatewayDirection").upper()]
exclusive_gateway = BPMN.ExclusiveGateway(id=curr_el.get("id"), name=name, gateway_direction=direction, process=process)
except:
exclusive_gateway = BPMN.ExclusiveGateway(id=curr_el.get("id"), name=name, gateway_direction=BPMN.Gateway.Direction.UNSPECIFIED, process=process)
bpmn_graph.add_node(exclusive_gateway)
node = exclusive_gateway
nodes_dict[id] = node
elif tag.endswith("parallelgateway"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el.attrib else ""
try:
direction = BPMN.Gateway.Direction[curr_el.get("gatewayDirection").upper()]
parallel_gateway = BPMN.ParallelGateway(id=curr_el.get("id"), name=name, gateway_direction=direction, process=process)
except:
parallel_gateway = BPMN.ParallelGateway(id=curr_el.get("id"), name=name, gateway_direction=BPMN.Gateway.Direction.UNSPECIFIED, process=process)
bpmn_graph.add_node(parallel_gateway)
node = parallel_gateway
nodes_dict[id] = node
elif tag.endswith("inclusivegateway"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el.attrib else ""
try:
direction = BPMN.Gateway.Direction[curr_el.get("gatewayDirection").upper()]
inclusive_gateway = BPMN.InclusiveGateway(id=curr_el.get("id"), name=name, gateway_direction=direction, process=process)
except:
inclusive_gateway = BPMN.InclusiveGateway(id=curr_el.get("id"), name=name, gateway_direction=BPMN.Gateway.Direction.UNSPECIFIED, process=process)
bpmn_graph.add_node(inclusive_gateway)
node = inclusive_gateway
nodes_dict[id] = node
elif tag.endswith("incoming"): # incoming flow of a node
if node is not None:
incoming_dict[curr_el.text.strip()] = (node, process, tag)
elif tag.endswith("outgoing"): # outgoing flow of a node
if node is not None:
outgoing_dict[curr_el.text.strip()] = (node, process, tag)
elif tag.endswith("sequenceflow"): # normal sequence flow between two nodes
seq_flow_id = curr_el.get("id")
source_ref = curr_el.get("sourceRef")
target_ref = curr_el.get("targetRef")
if source_ref is not None and target_ref is not None:
incoming_dict[seq_flow_id] = (target_ref, process, tag)
outgoing_dict[seq_flow_id] = (source_ref, process, tag)
elif tag.endswith("waypoint"): # contains information of x, y values of an edge
if flow is not None:
x = float(curr_el.get("x"))
y = float(curr_el.get("y"))
if not flow in flow_info:
flow_info[flow] = []
flow_info[flow].append((x, y))
elif tag.endswith("label"): # label of a node, mostly at the end of a shape object
bpmn_element = None
elif tag.endswith("bounds"): # contains information of width, height, x, y of a node
if bpmn_element is not None:
x = float(curr_el.get("x"))
y = float(curr_el.get("y"))
width = float(curr_el.get("width"))
height = float(curr_el.get("height"))
nodes_bounds[bpmn_element] = {"x": x, "y": y, "width": width, "height": height}
for child in curr_el:
bpmn_graph = parse_element(bpmn_graph, counts, child, list(parents) + [child], incoming_dict, outgoing_dict,
nodes_dict, nodes_bounds, flow_info, process=process, node=node,
bpmn_element=bpmn_element,
flow=flow, rec_depth=rec_depth + 1)
# afterprocessing when the xml tree has been recursively parsed already
if rec_depth == 0:
# bpmn_graph.set_process_id(process)
for seq_flow_id in incoming_dict:
if incoming_dict[seq_flow_id][0] in nodes_dict:
incoming_dict[seq_flow_id] = (nodes_dict[incoming_dict[seq_flow_id][0]], incoming_dict[seq_flow_id][1], incoming_dict[seq_flow_id][2])
for seq_flow_id in outgoing_dict:
if outgoing_dict[seq_flow_id][0] in nodes_dict:
outgoing_dict[seq_flow_id] = (nodes_dict[outgoing_dict[seq_flow_id][0]], outgoing_dict[seq_flow_id][1], outgoing_dict[seq_flow_id][2])
for flow_id in flow_info:
if flow_id in outgoing_dict and flow_id in incoming_dict:
if isinstance(outgoing_dict[flow_id][0], BPMN.BPMNNode) and isinstance(incoming_dict[flow_id][0], BPMN.BPMNNode):
flow = BPMN.SequenceFlow(outgoing_dict[flow_id][0], incoming_dict[flow_id][0], id=flow_id, name="", process=outgoing_dict[flow_id][1])
bpmn_graph.add_flow(flow)
flow.del_waypoints()
for waypoint in flow_info[flow_id]:
flow.add_waypoint(waypoint)
for node_id in nodes_bounds:
if node_id in nodes_dict:
bounds = nodes_bounds[node_id]
node = nodes_dict[node_id]
node.set_x(bounds["x"])
node.set_y(bounds["y"])
node.set_width(bounds["width"])
node.set_height(bounds["height"])
return bpmn_graph
def parse_element(bpmn_graph, counts, curr_el, parents, incoming_dict, outgoing_dict, nodes_dict, nodes_bounds,
flow_info, process=None, node=None, bpmn_element=None, flow=None, rec_depth=0):
"""
Parses a BPMN element from the XML file
"""
tag = curr_el.tag.lower()
if tag.endswith("process"):
process = curr_el.get("id")
elif tag.endswith("shape"):
bpmn_element = curr_el.get("bpmnElement")
elif tag.endswith("task"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "")
this_type = str(curr_el.tag)
this_type = this_type[this_type.index("}") + 1:]
task = BPMN.Task(name=name, type=this_type)
bpmn_graph.add_node(task)
node = task
nodes_dict[id] = node
elif tag.endswith("startevent"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el else str(uuid.uuid4())
start_event = BPMN.StartEvent(name=name)
bpmn_graph.add_node(start_event)
node = start_event
nodes_dict[id] = node
elif tag.endswith("endevent"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el else str(uuid.uuid4())
end_event = BPMN.EndEvent(name=name)
bpmn_graph.add_node(end_event)
node = end_event
nodes_dict[id] = node
elif tag.endswith("event"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", " ").replace("\n", " ") if "name" in curr_el else str(uuid.uuid4())
this_type = str(curr_el.tag)
this_type = this_type[this_type.index("}") + 1:]
other_event = BPMN.OtherEvent(name=name, type=this_type)
bpmn_graph.add_node(other_event)
node = other_event
nodes_dict[id] = node
elif tag.endswith("edge"):
bpmnElement = curr_el.get("bpmnElement")
flow = bpmnElement
elif tag.endswith("exclusivegateway"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el else str(uuid.uuid4())
exclusive_gateway = BPMN.ExclusiveGateway(name=name)
bpmn_graph.add_node(exclusive_gateway)
node = exclusive_gateway
nodes_dict[id] = node
elif tag.endswith("parallelgateway"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el else str(uuid.uuid4())
parallel_gateway = BPMN.ParallelGateway(name=name)
bpmn_graph.add_node(parallel_gateway)
node = parallel_gateway
nodes_dict[id] = node
elif tag.endswith("inclusivegateway"):
id = curr_el.get("id")
name = curr_el.get("name").replace("\r", "").replace("\n", "") if "name" in curr_el else str(uuid.uuid4())
inclusive_gateway = BPMN.InclusiveGateway(name=name)
bpmn_graph.add_node(inclusive_gateway)
node = inclusive_gateway
nodes_dict[id] = node
elif tag.endswith("incoming"):
if node is not None:
incoming_dict[curr_el.text.strip()] = node
elif tag.endswith("outgoing"):
if node is not None:
outgoing_dict[curr_el.text.strip()] = node
elif tag.endswith("sequenceflow"):
seq_flow_id = curr_el.get("id")
source_ref = curr_el.get("sourceRef")
target_ref = curr_el.get("targetRef")
# fix 28/04/2021: do not assume anymore to read the nodes before the edges
incoming_dict[seq_flow_id] = target_ref
outgoing_dict[seq_flow_id] = source_ref
elif tag.endswith("waypoint"):
if flow is not None:
x = float(curr_el.get("x"))
y = float(curr_el.get("y"))
if not flow in flow_info:
flow_info[flow] = []
flow_info[flow].append((x, y))
elif tag.endswith("label"):
bpmn_element = None
elif tag.endswith("bounds"):
if bpmn_element is not None:
x = float(curr_el.get("x"))
y = float(curr_el.get("y"))
width = float(curr_el.get("width"))
height = float(curr_el.get("height"))
nodes_bounds[bpmn_element] = {"x": x, "y": y, "width": width, "height": height}
for child in curr_el:
bpmn_graph = parse_element(bpmn_graph, counts, child, list(parents) + [child], incoming_dict, outgoing_dict,
nodes_dict, nodes_bounds, flow_info, process=process, node=node,
bpmn_element=bpmn_element,
flow=flow, rec_depth=rec_depth + 1)
if rec_depth == 0:
for seq_flow_id in incoming_dict:
if incoming_dict[seq_flow_id] in nodes_dict:
incoming_dict[seq_flow_id] = nodes_dict[incoming_dict[seq_flow_id]]
for seq_flow_id in outgoing_dict:
if outgoing_dict[seq_flow_id] in nodes_dict:
outgoing_dict[seq_flow_id] = nodes_dict[outgoing_dict[seq_flow_id]]
for flow_id in flow_info:
if flow_id in outgoing_dict and flow_id in incoming_dict:
flow = BPMN.Flow(outgoing_dict[flow_id], incoming_dict[flow_id])
bpmn_graph.add_flow(flow)
flow.del_waypoints()
for waypoint in flow_info[flow_id]:
flow.add_waypoint(waypoint)
for node_id in nodes_bounds:
if node_id in nodes_dict:
bounds = nodes_bounds[node_id]
node = nodes_dict[node_id]
node.set_x(bounds["x"])
node.set_y(bounds["y"])
node.set_width(bounds["width"])
node.set_height(bounds["height"])
return bpmn_graph
def recursively_add_tree(parent_tree, tree, bpmn, initial_event, final_event, counts, rec_depth):
from pm4py.objects.bpmn.obj import BPMN
tree_childs = [child for child in tree.children]
initial_connector = None
final_connector = None
if tree.operator is None:
trans = tree
if trans.label is None:
bpmn, task, counts = add_tau_task(bpmn, counts)
bpmn.add_flow(BPMN.Flow(initial_event, task))
bpmn.add_flow(BPMN.Flow(task, final_event))
initial_connector = task
final_connector = task
else:
bpmn, task, counts = add_task(bpmn, counts, trans.label)
bpmn.add_flow(BPMN.Flow(initial_event, task))
bpmn.add_flow(BPMN.Flow(task, final_event))
initial_connector = task
final_connector = task
elif tree.operator == Operator.XOR:
bpmn, split_gateway, join_gateway, counts = add_xor_gateway(bpmn, counts)
for subtree in tree_childs:
bpmn, counts, x, y = recursively_add_tree(tree, subtree, bpmn, split_gateway, join_gateway,
counts,
rec_depth + 1)
bpmn.add_flow(BPMN.Flow(initial_event, split_gateway))
bpmn.add_flow(BPMN.Flow(join_gateway, final_event))
initial_connector = split_gateway
final_connector = join_gateway
elif tree.operator == Operator.PARALLEL:
bpmn, split_gateway, join_gateway, counts = add_parallel_gateway(bpmn, counts)
for subtree in tree_childs:
bpmn, counts, x, y = recursively_add_tree(tree, subtree, bpmn, split_gateway, join_gateway,
counts,
rec_depth + 1)
bpmn.add_flow(BPMN.Flow(initial_event, split_gateway))
bpmn.add_flow(BPMN.Flow(join_gateway, final_event))
initial_connector = split_gateway
final_connector = join_gateway
elif tree.operator == Operator.OR:
bpmn, split_gateway, join_gateway, counts = add_inclusive_gateway(bpmn, counts)
for subtree in tree_childs:
bpmn, counts, x, y = recursively_add_tree(tree, subtree, bpmn, split_gateway, join_gateway,
counts,
rec_depth + 1)
bpmn.add_flow(BPMN.Flow(initial_event, split_gateway))
bpmn.add_flow(BPMN.Flow(join_gateway, final_event))
initial_connector = split_gateway
final_connector = join_gateway
elif tree.operator == Operator.SEQUENCE:
initial_intermediate_task = initial_event
bpmn, final_intermediate_task, counts = add_tau_task(bpmn, counts)
for i in range(len(tree_childs)):
bpmn, counts, initial_connect, final_connect = recursively_add_tree(tree, tree_childs[i], bpmn,
initial_intermediate_task,
final_intermediate_task, counts,
rec_depth + 1)
initial_intermediate_task = final_connect
if i == 0:
initial_connector = initial_connect
if i == len(tree_childs) - 2:
final_intermediate_task = final_event
else:
bpmn, final_intermediate_task, counts = add_tau_task(bpmn, counts)
final_connector = final_connect
elif tree.operator == Operator.LOOP:
if len(tree_childs) != 2:
raise Exception("Loop doesn't have 2 childs")
else:
do = tree_childs[0]
redo = tree_childs[1]
bpmn, split, join, counts = add_xor_gateway(bpmn, counts)
bpmn, counts, i, y = recursively_add_tree(tree, do, bpmn, join, split, counts, rec_depth + 1)
bpmn, counts, x, y = recursively_add_tree(tree, redo, bpmn, split, join, counts, rec_depth + 1)
bpmn.add_flow(BPMN.Flow(initial_event, join))
bpmn.add_flow(BPMN.Flow(split, final_event))
initial_connector = join
final_connector = split
return bpmn, counts, initial_connector, final_connector
def apply(net, im, fm, parameters=None):
"""
Converts an accepting Petri net into a BPMN diagram
Parameters
--------------
accepting_petri_net
Accepting Petri net (list containing net + im + fm)
parameters
Parameters of the algorithm
Returns
--------------
bpmn_graph
BPMN diagram
"""
if parameters is None:
parameters = {}
from pm4py.objects.bpmn.obj import BPMN
from pm4py.objects.bpmn.util import reduction
bpmn_graph = BPMN()
entering_dictio = {}
exiting_dictio = {}
for place in net.places:
node = BPMN.ExclusiveGateway()
bpmn_graph.add_node(node)
entering_dictio[place] = node
exiting_dictio[place] = node
for trans in net.transitions:
if trans.label is None:
if len(trans.in_arcs) > 1 or len(trans.out_arcs) > 1:
node = BPMN.ParallelGateway()
else:
node = BPMN.ExclusiveGateway()
bpmn_graph.add_node(node)
entering_dictio[trans] = node
exiting_dictio[trans] = node
else:
if len(trans.in_arcs) > 1:
entering_node = BPMN.ParallelGateway()
else:
entering_node = BPMN.ExclusiveGateway()
if len(trans.out_arcs) > 1:
exiting_node = BPMN.ParallelGateway()
else:
exiting_node = BPMN.ExclusiveGateway()
task = BPMN.Task(name=trans.label)
bpmn_graph.add_node(task)
bpmn_graph.add_flow(BPMN.Flow(entering_node, task))
bpmn_graph.add_flow(BPMN.Flow(task, exiting_node))
entering_dictio[trans] = entering_node
exiting_dictio[trans] = exiting_node
for arc in net.arcs:
bpmn_graph.add_flow(
BPMN.Flow(exiting_dictio[arc.source], entering_dictio[arc.target]))
start_node = BPMN.StartEvent()
end_node = BPMN.EndEvent()
bpmn_graph.add_node(start_node)
bpmn_graph.add_node(end_node)
for place in im:
bpmn_graph.add_flow(BPMN.Flow(start_node, entering_dictio[place]))
for place in fm:
bpmn_graph.add_flow(BPMN.Flow(exiting_dictio[place], end_node))
bpmn_graph = reduction.apply(bpmn_graph)
return bpmn_graph
def apply(net, im, fm, parameters=None):
"""
Converts an accepting Petri net into a BPMN diagram
Parameters
--------------
accepting_petri_net
Accepting Petri net (list containing net + im + fm)
parameters
Parameters of the algorithm
Returns
--------------
bpmn_graph
BPMN diagram
"""
if parameters is None:
parameters = {}
from pm4py.objects.bpmn.obj import BPMN
from pm4py.objects.bpmn.util import reduction
bpmn_graph = BPMN()
entering_dictio = {}
exiting_dictio = {}
for place in net.places:
node = BPMN.ExclusiveGateway()
bpmn_graph.add_node(node)
entering_dictio[place] = node
exiting_dictio[place] = node
for trans in net.transitions:
if trans.label is None:
if len(trans.in_arcs) > 1:
node = BPMN.ParallelGateway(gateway_direction=BPMN.Gateway.Direction.CONVERGING)
elif len(trans.out_arcs) > 1:
node = BPMN.ParallelGateway(gateway_direction=BPMN.Gateway.Direction.DIVERGING)
else:
node = BPMN.ExclusiveGateway(gateway_direction=BPMN.Gateway.Direction.UNSPECIFIED)
bpmn_graph.add_node(node)
entering_dictio[trans] = node
exiting_dictio[trans] = node
else:
if len(trans.in_arcs) > 1:
entering_node = BPMN.ParallelGateway(gateway_direction=BPMN.Gateway.Direction.CONVERGING)
else:
entering_node = BPMN.ExclusiveGateway(gateway_direction=BPMN.Gateway.Direction.UNSPECIFIED)
if len(trans.out_arcs) > 1:
exiting_node = BPMN.ParallelGateway(gateway_direction=BPMN.Gateway.Direction.DIVERGING)
else:
exiting_node = BPMN.ExclusiveGateway(gateway_direction=BPMN.Gateway.Direction.UNSPECIFIED)
task = BPMN.Task(name=trans.label)
bpmn_graph.add_node(task)
bpmn_graph.add_flow(BPMN.Flow(entering_node, task))
bpmn_graph.add_flow(BPMN.Flow(task, exiting_node))
entering_dictio[trans] = entering_node
exiting_dictio[trans] = exiting_node
for arc in net.arcs:
bpmn_graph.add_flow(BPMN.Flow(exiting_dictio[arc.source], entering_dictio[arc.target]))
start_node = BPMN.StartEvent(name="start", isInterrupting=True)
end_node = BPMN.NormalEndEvent(name="end")
bpmn_graph.add_node(start_node)
bpmn_graph.add_node(end_node)
for place in im:
bpmn_graph.add_flow(BPMN.Flow(start_node, entering_dictio[place]))
for place in fm:
bpmn_graph.add_flow(BPMN.Flow(exiting_dictio[place], end_node))
bpmn_graph = reduction.apply(bpmn_graph)
for node in bpmn_graph.get_nodes():
node.set_process(bpmn_graph.get_process_id())
for edge in bpmn_graph.get_flows():
edge.set_process(bpmn_graph.get_process_id())
return bpmn_graph
def reduce_xor_gateways(bpmn_graph, parameters=None):
"""
Reduces the number of XOR gateways in the diagram
Parameters
------------
bpmn_graph
BPMN graph
parameters
Parameters
Returns
------------
bpmn_graph
(possibly reduced) BPMN graph
"""
if parameters is None:
parameters = {}
changed = True
while changed:
changed = False
outgoing_edges = None
incoming_edges = None
outgoing_edges = {}
incoming_edges = {}
for flow in bpmn_graph.get_flows():
source = flow.get_source()
target = flow.get_target()
if source not in outgoing_edges:
outgoing_edges[source] = set()
outgoing_edges[source].add(flow)
if target not in incoming_edges:
incoming_edges[target] = set()
incoming_edges[target].add(flow)
nodes = list(bpmn_graph.get_nodes())
for node in nodes:
if isinstance(node, BPMN.ExclusiveGateway):
if node in outgoing_edges and node in incoming_edges and len(
outgoing_edges[node]) == 1 and len(
incoming_edges[node]) == 1:
changed = True
source_node = None
target_node = None
for flow in incoming_edges[node]:
source_node = flow.get_source()
if flow in bpmn_graph.get_flows():
bpmn_graph.remove_flow(flow)
for flow in outgoing_edges[node]:
target_node = flow.get_target()
if flow in bpmn_graph.get_flows():
bpmn_graph.remove_flow(flow)
if node in bpmn_graph.get_nodes():
bpmn_graph.remove_node(node)
bpmn_graph.add_flow(BPMN.Flow(source_node, target_node))
break
return bpmn_graph
