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Primitives, which include integers, strings, doubles, arrays, and other low-level language elements, are generic because many people use them Classes, on the other hand, may be as specific as you need them to be because you create them for specific purposes In many cases, classes provide a simpler and more natural way to model things than primitives In addition, once you create a class, you'll often discover that other code in a system belongs in that class Fowler and Beck [F] explain how Primitive Obsession manifests itself when code relies too much on primitives This typically occurs when you haven't yet seen how a higher-level abstraction can clarify or simplify your code Fowler's refactorings include many of the most common solutions for addressing this problem This book builds on those solutions and offers more If a primitive value controls logic in a class and the primitive value isn't type-safe (ie, clients can assign it to an unsafe or incorrect value), consider applying Replace Type Code with Class (286) The result will be code that is type-safe and capable of being extended by new behavior (something you can't do with a primitive) If an object's state transitions are controlled by complex conditional logic that uses primitive values, you can use Replace State-Altering Conditionals with State (166) The result will be numerous classes to represent each state and simplified state transition logic If complicated conditional logic controls which algorithm to run and that logic relies on primitive values, consider applying Replace Conditional Logic with Strategy (129) If you implicitly create a tree structure using a primitive representation, such as a string, your code may be difficult to work with, prone to errors, and/or filled with duplication Applying Replace Implicit Tree with Composite (178) will reduce these problems If many methods of a class exist to support numerous combinations of primitive values, you may have an implicit language If so, consider applying Replace Implicit Language with Interpreter (269) If primitive values exist in a class only to provide embellishments to the class's core responsibility, you may want to use Move Embellishment to Decorator (144) Finally, even if you have a class, it may still be too primitive to make life easy for clients This may be the case if you have a Composite [DP] implementation that is tricky to work with You can simplify how clients build the Composite by applying Encapsulate Composite with Builder (96).

This pushes Item into SniperLauncher which, in turn, pushes it through to its dependent types such as AuctionHouse and AuctionSniper We x the compilation errors and make all the tests pass again except for the outstanding end-to-end test which we have yet to implement We ve now made explicit another concept in the domain We realize that an item s identi er is only one part of how a user bids in an auction Now the code can tell us exactly where decisions are made about bidding choices, so we don t have to follow a chain of method calls to see which strings are relevant

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This smell indicates the lack of what David Parnas so famously termed "information hiding" [Parnas] The smell occurs when methods or classes that ought not be visible to clients are publicly visible to them Exposing such code means that clients know about code that is unimportant or only indirectly important This contributes to the complexity of a design The refactoring Encapsulate Classes with Factory (80) deodorizes this smell Not every class that is useful to clients needs to be public (ie, have a public constructor) Some classes ought to be referenced only via their common interfaces You can make that happen if you make the class's constructors non-public and use a Factory to produce instances

The last step to nish the task is to make the AuctionSniper observe the stop price we ve just passed to it and stop bidding In practice, we can ensure that we ve covered everything by writing unit tests for each of the new state transitions drawn in Figure 181 Our rst test triggers the Sniper to start bidding and then announces a bid outside its limit the stop price is set to 1234 We ve also extracted a common expectation into a helper method1

Applications sometimes need to display widely varying numbers of user interface objects For example, in an application that monitors the computers of a growing corporation, the number of objects representing computers at a particular site might increase rapidly When looking for a particular object in a window representing that site, a user might need to view 15 objects in one month or 1500 the next The user interface of such an application should be scalable In other words, it should enable users to find, view, and manipulate widely varying numbers of objects This book discusses several ways to make your application's user interface more scalable For example, 4 describes filtering and searching--features that enhance an application's ability to manipulate large sets of objects

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@Test public void doesNotBidAndReportsLosingIfSubsequentPriceIsAboveStopPrice() { allowingSniperBidding(); contextchecking(new Expectations() {{ int bid = 123 + 45; allowing(auction)bid(bid); atLeast(1)of(sniperListener)sniperStateChanged( new SniperSnapshot(ITEM_ID, 2345, bid, LOSING)); when(sniperStateis("bidding")); }}); snipercurrentPrice(123, 45, PriceSourceFromOtherBidder); snipercurrentPrice(2345, 25, PriceSourceFromOtherBidder); } private void allowingSniperBidding() { contextchecking(new Expectations() {{ allowing(sniperListener)sniperStateChanged(with(aSniperThatIs(BIDDING))); then(sniperStateis("bidding")); }}); }

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