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When you must use third-party scripts in your Cake application, it s best to include them as vendors using the App::import() method. Once the script is available, its functions and objects can be directly called in the application. Of course, because vendors work in Cake unidirectionally, how you further implement the vendor will depend on the vendor s own methods. In this chapter, we discussed using components from Zend Framework to perform Akismet spam checks and PDF file rendering. Other web service components can be used in Cake using similar methods. In 13, we ll examine plugins resources that allow you to create a mini-application of sorts that can be distributed across multiple Cake applications.

When you use the XmlDocument class, your XML document is created as a series of linked .NET objects in memory. Figure 19-4 shows the object model. (The diagram is slightly simplified from what you ll find when you start using the XmlDocument class namely, it doesn t show the attributes, each of which is represented by an XmlAttribute object.)

Figure 19-4. An XML document in memory The following is an example that creates the SuperProProductList document in memory, using an XmlDocument class. When the document is completely built, the code saves it to a file using the XmlDocument.Save() method.

' Start with a blank in memory document. Dim doc As New XmlDocument() ' Create some variables that will be useful for ' manipulating XML data. Dim RootElement, ProductElement, PriceElement As XmlElement Dim ProductAttribute As XmlAttribute Dim Comment As XmlComment ' Create the declaration. Dim Declaration As XmlDeclaration Declaration = doc.CreateXmlDeclaration("1.0", Nothing, "yes") ' Insert the declaration as the first node. doc.InsertBefore(Declaration, doc.DocumentElement) ' Add a comment. Comment = doc.CreateComment("Created with the XmlDocument class.") doc.InsertAfter(Comment, Declaration) ' Add the root element. RootElement = doc.CreateElement("SuperProProductList") doc.InsertAfter(RootElement, Comment) ' Add the first product. ProductElement = doc.CreateElement("Product") RootElement.AppendChild(ProductElement) ' Set and add the product attributes. ProductAttribute = doc.CreateAttribute("ID") ProductAttribute.Value = "1" ProductElement.SetAttributeNode(ProductAttribute) ProductAttribute = doc.CreateAttribute("Name") ProductAttribute.Value = "Chair" ProductElement.SetAttributeNode(ProductAttribute) ' Add the price element. PriceElement = doc.CreateElement("Price") PriceElement.InnerText = "49.33" ProductElement.AppendChild(PriceElement) ' (Code to add two more products omitted.) ' Save the document. Dim file As String = Path.Combine(Request.PhysicalApplicationPath, _ "App_Data\SuperProProductList.xml") doc.Save(file)

n some situations, developers may want to use a Cake application in several other applications. Sometimes another Cake application may be useful in your project but may be difficult to fit in because of its independent structure; controllers, models, and such may conflict with the current project s namespaces. Plugins are elements that function as mini-applications inside the main Cake application. They include their own models, views, and controllers, and they make it possible to reuse an entire application within other applications. Cake comes with no built-in plugins. Thus, only third-party applications can be used inside an existing Cake application. Of course, you may build your own plugins to fit your needs, but be aware that plugins are available online at various locations. The Bakery (http:// bakery.cakephp.org) and CakeForge (www.cakeforge.org) host plugins along with other Cake applications, components, helpers, and more. The Bakery also hosts articles explaining how developers wrote their plugins which can be useful in learning advanced CakePHP methods. Third-party plugins save time. Because they follow the MVC structure, they can do much more than a component or helper alone. A plugin may contain its own models and therefore work with the database in ways that a component or helper doesn t. Often, running a complex method for an application is as simple as dropping a plugin in the app/plugins directory and tweaking some settings in the application to get it running.

One of the best features of the XmlDocument class is that it doesn t rely on any underlying file. When you use the Save() method, the file is created, a stream is opened, the information is written, and the file is closed, all in one line of code. This means this is probably the only line you need to put inside a Try/Catch error-handling block. While you re manipulating data with the XML objects, your text file isn t being changed. Once again, this is conceptually similar to the ADO.NET DataSet.

Every separate part of the XML document is created as an object. Elements are created as XmlElement objects, comments are created as XmlComment objects, and attributes are represented as XmlAttribute objects.

Compare your results to Figure 4-21.

Tip For leaner code, you can call the SetAttribute() and GetAttribute() methods on an XmlElement object.