By Jos Warmer, Anneke Kleppe
ISBN-10: 0321179366
ISBN-13: 9780321179364
This booklet is a realistic, available consultant to OCL for software program architects, designers, and builders. a lot care has been taken through the redecorate of OCL to make sure that the syntax is still readable and writable via the typical software program modeler. the article Constraint Language, moment version, makes use of a case examine to teach find out how to workout those compact yet strong expressions for optimum impression.
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Additional resources for Object Constraint Language, The: Getting Your Models Ready for MDA
Sample text
The size Operation For R&L, it would be reasonable to require that a loyalty program offers at least one service to its customers. Using the dot notation, you can navigate from the context of a loyalty program through its program partners to the services they deliver. This results in a collection of Service instances. With the arrow notation, you can apply the predefined operation size. deliveredServices->size() >= 1 The select Operation Another invariant on the R&L model requires that the number of valid cards for every customer must be equal to the number of programs in which the customer participates.
This term is used in many contexts and often has a different meaning. For instance, the R&L system depicted in the previous chapter is often called a class model. A statechart is sometimes called a state model. Are these models two separate, unrelated items, or should we consider them to be part of the same thing? 1 Definitions In this book a model describes a system using a well-defined language. Therefore, the answer to the question above should be that both are views of the same model. Both class diagrams and the statecharts show items that describe the same system using the same language namely, UML.
This condition can be written as an OCL expression. Because an interaction diagram is an instance diagram, the OCL expression is written in the context of an instance, not a type. This is a rare case; therefore, extra attention has to be paid to determine the contextual type and the contextual instance. The contextual instance is the instance on whose lifeline the condition is written, and the contextual type is the type of this instance. An example can be found in Figure 3-6, which extends the sequence diagram in Figure 3-5.
Object Constraint Language, The: Getting Your Models Ready for MDA by Jos Warmer, Anneke Kleppe
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