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When a class has a method for processing one object and a nearly identical method for processing a collection of the objects, a one/many distinction exists Such a distinction can result in problems such as the following Duplicated code: Because the method that processes one object does the same thing as the method that processes a collection of the objects, duplicated code is often spread across the two methods It's possible to reduce this duplication without implementing a Composite [DP] (see the Example section for details), yet even if duplication is reduced, there are still two methods performing the same kind of processing Nonuniform client code: Whether they have single objects or collections of objects, clients want their objects processed in one way Yet the existence of two processing methods with different signatures forces clients to pass different kinds of data to the methods (ie, one object or a collection of objects) This makes client code nonuniform, which reduces simplicity Merging of results: The best way to explain this is with an example Say you want to find all products that are red and priced under $500 or blue and priced above $1000 One way to find these products is to call aProductRepository's selectBy(List specs) method, which returns a List of results Here's an example call to selectBy( ): List redProductsUnderFiveDollars = new ArrayList(); redProductsUnderFiveDollarsadd(new ColorSpec(Colorred)); redProductsUnderFiveDollarsadd(new BelowPriceSpec(500)); List foundRedProductsUnderFiveDollars = productRepositoryselectBy(redProductsUnderFiveDollars);

Now that you know the basics of using the Web service behavior, the next step is to call a more sophisticated operation that returns a complex type Listing 12-11 shows an example that calls the GetWeather operation which returns richer weather information Listing 12-11 Handling complex types with the Web service behavior (VBWSBook\12 \WSBehaviorhtml)

TextBookprototype = new Book();

The main problem with selectBy(List specs) is that it can't handle an OR condition So if you want to find all products that are red and under $500 or blue and above $1000, you have to make separate calls toselectBy( ) and then merge the results: List foundRedProductsUnderFiveDollars = productRepositoryselectBy(redProductsUnderFiveDollars); List foundBlueProductsAboveTenDollars = productRepositoryselectBy(blueProductsAboveTenDollars); List foundProducts = new ArrayList(); foundProductsaddAll(foundRedProductsUnderFiveDollars); foundProductsaddAll(foundBlueProductsAboveTenDollars);

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In assigning an instance of Book to TextBook s prototype, we are in essence assigning Book s public prototype to TextBook s private prototype Whenever we attempt to access one of Book s methods on a TextBook instance, JavaScript will search for that method in the public prototype of TextBook When it determines that the method doesn t exist on its own prototype, it walks to the next prototype in the chain, in this case Book s, and attempts to locate the method there If it nds it there, the method is executed; but if it doesn t nd it there, it continues walking the prototype chain until the chain is exhausted or the method is found and executed The chain is exhausted when Object s prototype is reached and searched Initially,

function GetWeather() { errInfoinnerHTML="";

As you can see, this approach is awkward and verbose The Composite pattern provides a better way It lets clients process one or many objects with a single method This has many benefits There's no duplicated code across methods because only one method handles the objects, whether one or many Clients communicate with that method in a uniform way Clients can make one call to obtain the results of processing a tree of objects rather than having to make several calls and merging processed results For example, to find red products under $500 or blue products above $1000, a client creates and passes the following Composite to the processing method:

This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks

1: Programming with JavaScript Object s prototype is null, but like any other object, Object s prototype can

condsinnerHTML="<b>Retrieving weather information </b>"; var objCall=new Object(); objCallasync=true; objCallfuncName="GetWeather"; objCallparams=new Array(); objCallparamszipCode=txtZipCodevalue; wsWeathercallService(objCall); } function onWeatherResult() { if(!handleError(eventresult)) { var doc=eventresultraw; tempinnerText=docselectSingleNode("//CurrentTemp")text; condsinnerHTML="Current conditions: " + docselectSingleNode("//Conditions")text + "<br>" + "Humidity: " + docselectSingleNode("//Humidity")text; iconsrc=docselectSingleNode("//IconUrl")text; } }

In short, replacing a one/many distinction with a Composite is a way to remove duplication, make client calls uniform, and support the processing of trees of objects However, if these latter two particular benefits aren't all that important to your system and you can reduce most of the duplication in methods that have a one/many distinction, a Composite implementation could be overkill One common downside of the Composite pattern relates to type safety To prevent clients from adding invalid objects to a Composite, the Composite code must contain runtime checks of the objects that clients attempt to add to it This problem is also present with collections because clients can add invalid objects to collections as well

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