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Achieving standardization by using interfaces Once a class inherits from an interface, it must implement all methods included in the interface definition. In addition, the implementation of the method names and signatures must match those defined in the interface. The compiler enforces these rules during code compilation. Therefore, to enforce a common standard, we can change our specification to stipulate that all custom extensions must inherit from the IDelivery interface. This means that all custom extensions will expose a method called Deliver, which takes exactly one parameter of the type Notification, as required by the definition of the interface. Dynamic type discovery But what if the developer forgets to inherit the custom extension class from our interface After all, a standard is only good when it is followed. You see, the second advantage of using interface inheritance, as well as object inheritance for that matter, is that the caller can easily discover whether an object implements a given interface during runtime. For example, we can write the following code in the Report Server to find out if the custom extension indeed adheres to our specification:

Dim xpath As String = //Employee[lastName= Davolio ]/firstName"

Most SharePoint sites permit access only by registered team members. There are several reasons for this:

Dim xn As XmlNode = xmldoc.SelectSingleNode(xpath)

It denies access by people outside your team. It s the only way you can assign different privileges such as Reader, Contributor, Web

who updated a library document, who posted to a discussion board, and who responded to a survey. A SharePoint site can get its list of authorized team members from either of two sources:

// instantiate the custom extension using Factory design pattern. if (typeof(customExtension) is IDeliveryExtension) // do something with the extension else throw new Exception("This custom extension doesn t implement IDeliveryInterface");

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If your site is inheriting its list of team members from its parent, the following commands won t appear on the Site Settings page.

birt pdf 417, birt barcode open source, birt code 128, birt ean 13, birt upc-a, birt data matrix

To learn how to configure a subsite so it uses its own list of team members, refer to Managing Permission Inheritance in 17.

Dim xnl As XmlNodeList = xmldoc.SelectNodes( //Employee[@id <= 4] )

If these commands do appear, you must be a site administrator to use them. To maintain the list of authorized team members (and their site groups, which determine permissions), proceed as follows.

Here, we use the C# type of operator (the VB.NET equivalent is TypeOf) to check to see whether the extension class implements the required interface after the custom extension object is instantiated. If this is not the case, we can react to this condition by throwing an exception. Polymorphism Interface inheritance allows us to use another powerful object-oriented technique called polymorphism. It allows the caller to treat different objects in the same way. We already used this technique in chapter 13. First, we implemented two pluggable report adapters that inherited from a common IReportAdapter interface. Then, we used the factory design pattern to instantiate the requested adapter and cast its reference to IReportAdapter. UNDERSTANDING REPORTING SERVICES EXTENSIBILITY 521

Dim xmlEl As XmlElement = DirectCast(node, XmlElement)

1 On the Site Settings page, under Administration, click Manage Users. This displays the Manage Users page shown in Figure 16-2.

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(We know that there is only one <lastName> child node.) Debug.WriteLine(xmlEl.GetElementsByTagName( lastName )(0).InnerText()) Next

In our scenario, polymorphism helps to expand the above example and work with the custom extension objects in this way:

Figure 16-2. This page displays, adds, modifies, and deletes team members authorized to access a site.

The XslTransform class is the key for working with Extensible Stylesheet Language Transformations (XSLT), which allow you to transform an XML document into another XML document. Typically, you use an XSLT to change the layout of existing XML data for example, to change the order of XML elements, to transform XML elements into attributes, or to produce a browsable file in XHTML format (the XML-compliant version of HTML). To see how this class works, let s start by creating an XSLT file named Employ ees.xslt, which transforms the Employee.xml file into an .html file that you can then view inside a browser. You can create an .xslt file using Notepad or by pointing to New on the File menu in Visual Studio .NET, then selecting File, and finally clicking the General category in the New File dialog box and double-clicking XSLT File. Unlike source code files, XSLT documents are created in memory, and you ll be asked for their path only when you save them.

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< xml version="1.0 encoding="UTF-8 > <xsl:stylesheet version="1.0 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/"> <HTML> <TITLE>Employees Table</TITLE> <TABLE BORDER= 1 > <THEAD> <TH>First Name</TH> <TH>Last Name</TH> <TH>Birth Date</TH> <TH>Address</TH> <TH>City</TH> </THEAD>

// instantiate the custom extension using Factory design pattern. if (typeof(customExtension) is IDeliveryExtension) // cast to IDeliveryExtension to call Deliver ((IDeliveryExtension) customExtension).Deliver(notification); else throw new Exception("This custom extension doesn t implement IDeliveryInterface");

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