By Jos Warmer, Anneke Kleppe
This e-book is a pragmatic, obtainable advisor to OCL for software program architects, designers, and builders. a lot care has been taken in the course of the remodel of OCL to make sure that the syntax is still readable and writable by way of the common software program modeler. the article Constraint Language, moment variation, makes use of a case research to teach the right way to workout those compact yet robust expressions for optimum influence.
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Extra info for Object Constraint Language, The: Getting Your Models Ready for MDA
Adding them to the model results in a more complete specification of the system. 1 Simple Preconditions and Postconditions The context of preconditions and postconditions is specified by the name of the class that holds the operation and the operation signature (its name, parmeters, and return type).  When the number of points on the account is zero, the operation returns the value true. The postcondition states this more precisely; it tells us that the operation returns the outcome of the boolean expression points = 0.
The preceding invariant is named oneOwner. 5 Preconditions and Postconditions Preconditions and postconditions to operations are yet another way to complete the model depicted in a class diagram. Because pre- and postconditions do not specify how the body of an operation should be implemented, they are an effective way to precisely define the interfaces in the system. The concepts are defined as follows: A precondition is a boolean expression that must be true at the moment that the operation starts its execution.
However, sometimes you explicitly want to mention the subclasses. In the R&L example, the program partners want to limit the number of bonus points they give away; they have set a maximum of 10,000 points to be earned using services of one partner. The following invariant sums all the points of all transactions for a partner. points->sum() < 10,000 To determine the subclass to which an element of this collection of transactions belongs, we use the standard operation oclIsTypeOf, which takes a class, datatype, component, or interface name as parameter.