Class UML 2.3::ProtocolTransition

Description:

A protocol transition specifies a legal transition for an operation. Transitions of protocol state machines have the following information: a pre condition (guard), on trigger, and a post condition. Every protocol transition is associated to zero or one operation (referred BehavioralFeature) that belongs to the context classifier of the protocol state machine.

Direct Superclasses: Transition

Direct Subclasses:

Class Precedence List: ProtocolTransition, Transition, Namespace, RedefinableElement, NamedElement, Element

Properties:

postCondition : Constraint (0 1); -- source ProtocolTransition

Specifies the post condition of the transition which is the condition that should be obtained once the transition is triggered. This post condition is part of the post condition of the operation connected to the transition.
{composite}
Subsets: Namespace.ownedRule

preCondition : Constraint (0 1); -- source ProtocolTransition
referred : Operation (0 *); -- source ProtocolTransition
container : Region (1 1); -- source Transition
effect : Behavior (0 1); -- source Transition
guard : Constraint (0 1); -- source Transition
kind : TransitionKind (1 1); -- source Transition
redefinedTransition : Transition (0 1); -- source Transition
redefinitionContext : Classifier (1 1); -- source Transition
source : Vertex (1 1); -- source Transition
target : Vertex (1 1); -- source Transition
trigger : Trigger (0 *); -- source Transition
elementImport : ElementImport (0 *); -- source Namespace
importedMember : PackageableElement (0 *); -- source Namespace
member : NamedElement (0 *); -- source Namespace
ownedMember : NamedElement (0 *); -- source Namespace
ownedRule : Constraint (0 *); -- source Namespace
packageImport : PackageImport (0 *); -- source Namespace
isLeaf : Boolean (1 1); -- source RedefinableElement
redefinedElement : RedefinableElement (0 *); -- source RedefinableElement
clientDependency : Dependency (0 *); -- source NamedElement
name : String (0 1); -- source NamedElement
nameExpression : StringExpression (0 1); -- source NamedElement
namespace : Namespace (0 1); -- source NamedElement
qualifiedName : String (0 1); -- source NamedElement
visibility : VisibilityKind (0 1); -- source NamedElement
ownedComment : Comment (0 *); -- source Element
ownedElement : Element (0 *); -- source Element
owner : Element (0 1); -- source Element

Constraints:

Signature: refers_to_operation() : Boolean;
Description: If a protocol transition refers to an operation (i. e. has a call trigger corresponding to an operation), then that operation should apply to the context classifier of the state machine of the protocol transition.
Expression: true

Signature: belongs_to_psm() : Boolean;
Description: A protocol transition always belongs to a protocol state machine.
Expression: container.belongsToPSM()

Signature: associated_actions() : Boolean;
Description: A protocol transition never has associated actions.
Expression: effect->isEmpty()

Operations:

No additional operations.

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