print barcode labels using c# PERMUTATIONS PATTERN in Font

Print PDF417 in Font PERMUTATIONS PATTERN

CHAPTER 5 PERMUTATIONS PATTERN
PDF417 Generator In None
Using Barcode creator for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
Drawing EAN / UCC - 14 In None
Using Barcode maker for Font Control to generate, create GS1 128 image in Font applications.
www.OnBarcode.com
When developing a server-side application, the approach taken to HTTP authentication is to add the user identifier code to a filter, as illustrated previously in the Accept HTTP header example. The filter will search for the Authorization HTTP header and attempt to create a user identifier. The example used ASP.NET code to extract the Authorization header. Some readers who know ASP.NET code will consider this a wrong approach because ASP.NET has methods and properties that manage authentication. I agree that the ASP.NET methods and properties would be a better solution, but because not all readers will be using ASP.NET, the approach that I took is one that can be applied to all platforms. If there are optimizations, then I say, Good, use them. The implementation does not matter anyway because interfaces are used and the applications using the implementations will not care how the user identification information is extracted. In fact, this is why interfaces are used so that you are not dependent on a particular implementation. The following source code starts the implementation of the IUserIdentification interface: public class UserIdentification : IUserIdentification { private string _identifier; private bool _isIdentified; public UserIdentification() { _isIdentified = false; } public UserIdentification( string identifier) { _identifier = identifier; _isIdentified = true; } public string Identifier { get { return _identifier; } } public bool IsIdentified { get { return _isIdentified; } } } The implementation of UserIdentification has two constructors, with and without parameters. There are two constructors to indicate the two states of user identification: found and not found. The constructor without parameters indicates that no user has been identified. The other constructor, which has a single parameter, indicates that user identification has been found; the single parameter is the state of the identified user. In the implementation of either constructor, the private data member isIdentified is assigned a value of true or false to indicate whether or not, respectively, a user identification has been found. The properties of UserIdentification define the state of the user identification, and it is important to understand that UserIdentification is a state object. A state object is one where the primary focus is to store data that is used by other processes to make decisions. A state
Barcode Creator In None
Using Barcode drawer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Barcode Generation In None
Using Barcode printer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
EBVN
Painting QR Code 2d Barcode In None
Using Barcode printer for Font Control to generate, create QR image in Font applications.
www.OnBarcode.com
Drawing EAN-13 In None
Using Barcode drawer for Font Control to generate, create GS1 - 13 image in Font applications.
www.OnBarcode.com
CHAPTER 5 PERMUTATIONS PATTERN
UPC-A Supplement 2 Generation In None
Using Barcode maker for Font Control to generate, create GTIN - 12 image in Font applications.
www.OnBarcode.com
Paint ISBN - 10 In None
Using Barcode generation for Font Control to generate, create Bookland EAN image in Font applications.
www.OnBarcode.com
object is very versatile because it does not have other type dependencies and does not manipulate other classes; thus the UserIdentification implementation would be similar for all IUserIdentificationResolver<> implementations. The interface IUserIdentificationResolver<> is used to extract the user identifiers. For HTTP authentication, the implementation is illustrated as follows: public class HttpAuthenticationResolver : IUserIdentificationResolver<HttpRequest> { IUserIdentificationFactory _factory; public HttpAuthenticationResolver(IUserIdentificationFactory factory) { _factory = factory; } public IUserIdentification Resolve(HttpRequest app) { if (request.Headers["Authorization"] != null) { string identifier = ""; // Do some operations to find out who it is return _factory.Create(identifier); } else { return _factory.Create(); } } } The class HttpAuthenticationResolver implements the interface IUserIdentificationResolver<>, and for the Generics parameter defines the type HttpRequest. What this declaration is saying is that the resolver will extract the user identification information from the type HttpRequest. In ASP.NET, HttpRequest contains all the information that is sent by the request. The constructor for HttpAuthenticationResolver has a parameter, which is an instance of the Factory pattern interface IUserIdentificationFactory. The Factory pattern interface is used by any IUserIdentificationResolver<> implementation whenever an instance of IUserIdentification needs to be instantiated. A Factory pattern implementation is used to instantiate an IUserIdentification instance because the IUserIdentificationResolver<> does not need to know about the type that implements IUserIdentification. In the implementation of Resolve, the Request.Headers property is referenced to extract the value of the Authorization header. If the HTTP header exists, an identifier is extracted and assigned to the variable identifier, which is passed to the method Create. Using the method Create with parameters indicates that a user has been identified. If the HTTP header is not found, the method Create without parameters is called to instantiate an IUserIdentification instance that indicates that the user has not been identified. The implementation of Resolve is fairly incomplete and simple because the details are beyond the scope of this discussion; different platforms and environments will be implemented in different techniques. What is complete is the theory of the Resolve method. The theory is that first a check must be made to see whether the HTTP request contains any HTTP authentication headers. If the HTTP headers contain authentication information, the headers must be processed. Regardless of whether or not authentication information is found, Resolve is required to instantiate an IUserIdentification instance.
Scan PDF417 In .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
PDF-417 2d Barcode Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Create Data Matrix ECC200 In Visual Basic .NET
Using Barcode generator for VS .NET Control to generate, create Data Matrix image in VS .NET applications.
www.OnBarcode.com
Matrix Barcode Maker In Java
Using Barcode printer for Java Control to generate, create Matrix 2D Barcode image in Java applications.
www.OnBarcode.com
QR Code 2d Barcode Creation In None
Using Barcode creator for Word Control to generate, create QR-Code image in Word applications.
www.OnBarcode.com
GS1 - 13 Generation In Objective-C
Using Barcode generation for iPad Control to generate, create EAN-13 image in iPad applications.
www.OnBarcode.com
UCC - 12 Creator In .NET
Using Barcode maker for .NET Control to generate, create UCC.EAN - 128 image in .NET framework applications.
www.OnBarcode.com
UPCA Encoder In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Universal Product Code version A image in ASP.NET applications.
www.OnBarcode.com
Code 128 Code Set C Generation In Objective-C
Using Barcode creator for iPad Control to generate, create USS Code 128 image in iPad applications.
www.OnBarcode.com
Printing Barcode In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Code 39 Creation In .NET
Using Barcode generator for ASP.NET Control to generate, create Code39 image in ASP.NET applications.
www.OnBarcode.com
Generating EAN / UCC - 13 In VB.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create GS1 - 13 image in .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.