c# barcode code 39 4: Structural Patterns: Adapter and Fa ade in C#.NET

Encoder USS Code 39 in C#.NET 4: Structural Patterns: Adapter and Fa ade

4: Structural Patterns: Adapter and Fa ade
Paint Code 39 Extended In Visual C#.NET
Using Barcode creator for .NET Control to generate, create Code39 image in Visual Studio .NET applications.
www.OnBarcode.com
Code-39 Reader In Visual C#.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Experiment 3: Increase the speed of the Seabird: Seacraft engine increases revs to 60 knots Seacraft engine increases revs to 70 knots Seabird flying at height 300 meters and speed 70 knots Experiments successful; the Seabird flies! */
Drawing Barcode In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Linear 1D Barcode Maker In Visual C#
Using Barcode creator for .NET Control to generate, create 1D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Pluggable Adapters
Drawing Code 39 In Visual C#.NET
Using Barcode encoder for .NET Control to generate, create Code 39 Extended image in .NET framework applications.
www.OnBarcode.com
Draw UPCA In C#.NET
Using Barcode maker for .NET Control to generate, create UPC-A Supplement 5 image in .NET applications.
www.OnBarcode.com
Developers who recognize that their systems will need to work with other components can increase their chances of adaptation. Identifying in advance the parts of the system that might change makes it easier to plug in adapters for a variety of new situations. Keeping down the size of an interface also increases the opportunities for new systems to be plugged in. Although not technically different from ordinary adapters, this feature of small interfaces gives them the name pluggable adapters. A distinguishing feature of pluggable adapters is that the name of a method called by the client and that existing in the ITarget interface can be different. The adapter must be able to handle the name change. In the previous adapter variations, this was true for all Adaptee methods, but the client had to use the names in the ITarget interface. Suppose the client wants to use its own names, or that there is more than one client and they have different terminologies. To achieve these name changes in a very dynamic way, we can use delegates (see later sidebar). Now, consider Example 4-3, which shows how to write pluggable adapters with delegates.
Code-128 Maker In Visual C#.NET
Using Barcode creation for .NET framework Control to generate, create Code 128A image in VS .NET applications.
www.OnBarcode.com
Encode USPS Confirm Service Barcode In C#
Using Barcode creator for VS .NET Control to generate, create Planet image in .NET applications.
www.OnBarcode.com
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 using System; // // // // Adapter Pattern - Pluggable Judith Bishop Oct 2007 Adapter can accept any number of pluggable adaptees and targets and route the requests via a delegate, in some cases using the anonymous delegate construct
Code 39 Extended Encoder In None
Using Barcode maker for Software Control to generate, create Code 3 of 9 image in Software applications.
www.OnBarcode.com
Code 3/9 Encoder In None
Using Barcode generator for Online Control to generate, create Code 39 image in Online applications.
www.OnBarcode.com
// Existing way requests are implemented class Adaptee { public double Precise (double a, double b) { return a/b; } } // New standard for requests class Target { public string Estimate (int i) { return "Estimate is " + (int) Math.Round(i/3.0); } }
Printing GS1 128 In Java
Using Barcode printer for BIRT reports Control to generate, create UCC-128 image in Eclipse BIRT applications.
www.OnBarcode.com
Generating Data Matrix ECC200 In None
Using Barcode generation for Software Control to generate, create Data Matrix ECC200 image in Software applications.
www.OnBarcode.com
Adapter Pattern
Draw QR Code ISO/IEC18004 In Java
Using Barcode creator for Android Control to generate, create QR Code image in Android applications.
www.OnBarcode.com
Code 39 Creation In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create Code 3 of 9 image in ASP.NET applications.
www.OnBarcode.com
|
Draw EAN13 In Objective-C
Using Barcode generation for iPhone Control to generate, create GS1 - 13 image in iPhone applications.
www.OnBarcode.com
Print PDF-417 2d Barcode In None
Using Barcode creator for Font Control to generate, create PDF 417 image in Font applications.
www.OnBarcode.com
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 // Implementing new requests via old class Adapter : Adaptee { public Func <int,string> Request; // Different constructors for the expected targets/adaptees // Adapter-Adaptee public Adapter (Adaptee adaptee) { // Set the delegate to the new standard Request = delegate(int i) { return "Estimate based on precision is " + (int) Math.Round(Precise (i,3)); }; } // Adapter-Target public Adapter (Target target) { // Set the delegate to the existing standard Request = target.Estimate; } } class Client { static void Main ( ) { Adapter adapter1 = new Adapter (new Adaptee( )); Console.WriteLine(adapter1.Request(5)); Adapter adapter2 = new Adapter (new Target( )); Console.WriteLine(adapter2.Request(5)); } } /* Output Estimate based on precision is 2 Estimate is 2 */
PDF417 Printer In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create PDF417 image in ASP.NET applications.
www.OnBarcode.com
Painting Data Matrix 2d Barcode In None
Using Barcode encoder for Microsoft Excel Control to generate, create Data Matrix 2d barcode image in Microsoft Excel applications.
www.OnBarcode.com
The delegate is contained in the Adapter and is instantiated on line 24, from one of the standard generic delegates. On lines 33 and 40, it is assigned to the methods Precise and Estimate, which are in the Adaptee and Target, respectively. Lines 31 34 show the use of an anonymous function to augment the results from the Adaptee. Notice that the Client (the Main method) refers only to its chosen method name, Request (see sidebar). The pluggable adapter sorts out which object is being plugged in at the time. Once a service has been plugged in and its methods have been assigned to the delegate objects, the association lasts until another set of methods is assigned. What characterizes a pluggable adapter is that it will have constructors for each of the
PDF-417 2d Barcode Printer In Java
Using Barcode generation for Java Control to generate, create PDF-417 2d barcode image in Java applications.
www.OnBarcode.com
UCC-128 Generator In Objective-C
Using Barcode drawer for iPhone Control to generate, create UCC-128 image in iPhone applications.
www.OnBarcode.com
86 |
Copyright © OnBarcode.com . All rights reserved.