Archetypes, Color, and the Domain-Neutral ... - Petercoad.com

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Class1attributemethodA class with an italicizedname is an abstract class(a class without objects).Inheritance link(points fromspecialization togeneralization)Class2attributemethodComponentThe 0..* cardinalityindicates that aclass2 object holdsa collection of somenumber of class3objects.Class31 association link0..*attributeThe 1 cardinalitylink role methodindicates that a1class3 object holdsexactly one class2Usualobject.cardinalitiesfor associationaggregation linkand aggregationlinks:0..1 10..* 1..*This is a UML package.Convention: use it as a0..*component symbol.Class4attributemethodImplements link(points from animplementer toan interface)interfaceInterface1methodAn interface specifiesmethod signatures. -->A.
2 ▼ Java Modeling in Color with UMLA sequence beginswith a sender, someobject that invokesthe initial method.aSenderanObject2...Class2anObject3...Class3The box is an object.Inside: object name,then class name.Time movesdown the page;message arrowsmay travel left toright or right to left.1: method4: 'getAttribute'2: method3: methodThe arrows are messages,from sender to receiver(and back again).A clipped arrowheadindicates an asynchronousmessage.A message name in single quotesis a comment; correspondingclass diagram(s) won't includea corresponding method for it.Most common use: getters and setters.The wide barsare activation bars,showing when anobject is active.This is a self-delegationmessage. The objectinvokes one of its ownmethods.5: methodThe vertical dashed linesare lifelines, indicatingthe life of the objectover time.Convention: Use "FOR each"notes to indicate iteration (ratherthan a UML asterisk, limited toa single message-send).Convention: Use IF and ELSEnotes for conditions (rather thanUML brackets; need room forwriting the condition).Convention: Use notes to listarguments for messages thatneed them (helps keep messagearrowlabels from becoming too long).FIGURE 1-2. ▲ Sequence-diagram notation and conventions1.1 ARCHETYPESNow let’s turn our attention to this chapter’s first major topic: archetypes.Here’s the concept we want to communicate:A form or template for one of a small number of class categories. Itspecifies attributes, links, methods, plug-in points, and interactionsthat are typical for classes in that category.Which of the following is the better term for this concept?Stereotype1. An unvarying model, as though cast from a mold2. A text tag for annotating a UML diagram element3. A broad categorization of classesArchetypeA form from which all things of the same kind more or less follow.[DERIVED FROM WEBSTER75 AND HAYAKAWA68]
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