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The Null Object pattern5 addresses the issue of not wanting to use null values. As outlined in 3, null values cause developers to have to check for valid conditions, empty conditions, and null conditions. For a large percentage of applications, empty conditions and null conditions are the same thing. Yet when writing code, both conditions need to be accounted for, causing more complex logic. A Null Object pattern is a specialization of the Proxy pattern in which the surrogate has no implemented functionality. You can employ the Null Object pattern if there is a base type, and that base type is defined using either an interface or base class. It s possible to use the Null Object pattern when the client does want to receive statistics information. For the movie ticket application, you need to implement the delegate RunningTotalBroadcast as follows: public class NullRunningTotalBroadcast { static void NothingRunningTotalBroadcast( double runningTotal) { } public static RunningTotalBroadcast GetInstance() { return new RunningTotalBroadcast( NothingRunningTotalBroadcast); } } NullRunningTotalBroadcast has declared two static methods. The method NothingRunningTotalBroadcast is the delegate for RunningTotalBroadcast. The method GetInstance retrieves a delegate instance that can be used by TicketBuilder. Following is the rewritten client code that uses the Null Object implementation: IList<Cinema.Ticket> list = Cinema.Implementations.TicketsBuilder.CreateCollection( Cinema.NullRunningTotalBroadcast.GetInstance()); list.Add(new Cinema.Ticket(10.0, 12)); list.Add(new Cinema.Ticket(10.0, 12)); list.RemoveAt( 1); The CreateCollection method receives as a parameter the result from NullRunning TotalBroadcast.GetInstance(), which is a delegate that does nothing. The client code illustrates how it s possible to use the existing types and methods, and yet implement new logic.

The final step in the process is to give your pine tree some needles. The key to this technique is to match the gradient on the tree. It is a lot easier than you may think.

If the project is an ASP.NET Web service or application, then you must also register the WSE SOAP extension class in the web.config file, as shown in Listing 5-3. Listing 5-3. The WSE SOAP Extension Type

1. Add a new layer named Needles. 2. Open the Color panel, select the Stroke color chip, and select Linear from the Type dropdown menu. The gradient you just created is now in the Stroke area of the Tools panel.

3. Select the Pencil tool, and set the stroke width to 20 pixels in the Properties panel. 4. Click the Edit stroke style button (the pencil to the right of the Style drop-down) in the

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Using the generic Flyweight pattern implementation isn t complicated and is well suited in a component situation. What is important about using the generic Flyweight pattern implementation is that it should be hidden in the context of a builder. Let s say that the following interface and implementations are instance types that a client is interested in: public interface ITestFlyweight { string Identifier { get; } } class TestFlyweightA : ITestFlyweight { public String Identifier { get { return "TestFlyweightA"; } } } class TestFlyweightB : ITestFlyweight { public String Identifier { get { return "TestFlyweightB"; } } }

<system.web> <webServices> <soapExtensionTypes> <add type="Microsoft.Web.Services2.WebServicesExtension, Microsoft.Web.Services2, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" priority="1" group="0" /> </soapExtensionTypes> </webServices> </system.web>

Properties panel to customize your stroke. In the Stroke Style dialog box shown in Figure 2-42, specify the following settings: Type: Hatched Thickness: Medium Space: Very Close Jiggle: Wild Rotate: Medium Curve: Medium Curve

5. Use the Zoom tool to zoom in on the tree. Draw four lines across the tree, as shown in Figure 2-43.

A number of preset strokes are available from the Property panel s drop-down menu to the left of the Edit stroke style button.

This step instructs WSE to process the project s SOAP messages through its filters. By default, WSE automatically applies all of its filters to SOAP messages. However, you can optimize the process by turning off selected filters. For example, if you do not implement routing and referral, then you can turn off the related filters. This simply means that WSE will stop looking for these related elements when it processes incoming and outbound SOAP messages.

The interface ITestFlyweight has a single property, Identifier, that retrieves a property value. In your own solutions, the interface could have as many methods or properties as needed, but the interface needs to be immutable. Additionally, an interface doesn t need to be used; instead you could employ a base class. Or if desired, in the declaration of FlyweightFactory you can include the type object, which allows the referencing of any object instance. In the example, TestFlyweightA and TestFlyweightB both implement the ITestFlyweight interface and a rudimentary implementation of the property Identifier. The following Builder class illustrates a complete Flyweight pattern implementation: class FlyweightBuilder { public static ITestFlyweight Transformation( object desc) { if( String.Compare( (string)desc, "TestFlyweightA") == 0) { return new TestFlyweightA(); } else if( String.Compare( (string)desc, "TestFlyweightB") == 0) { return new TestFlyweightB(); } throw new NotSupportedException(); } public static IFlyweightCollection< ITestFlyweight, string> Instantiate() { return new FlyweightCollection< ITestFlyweight, string>( new DelegateTransformer< string, ITestFlyweight>( FlyweightBuilder.Transformation)); } } FlyweightBuilder has two static methods: Instantiate and Transformation. The method Instantiate instantiates the FlyweightCollection class, where the Generic parameter is defined to be ITestFlyweight. This means that this Flyweight pattern implementation creates objects of type ITestFlyweight. The method Transformation instantiates either TestFlyweightA or TestFlyweightB depending on the value of parameter desc. If desc doesn t resolve to one of the two values, an exception is thrown.

Now that you have created the assets for the movie, let s put them to work. Follow these steps:

gray color: #666666.

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