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The setBooleanProperty() method, as shown in Code Sample 2-33, is essentially performing the same task as the aforementioned setStringProperty() method with one difference; instead of handling String object types, it handles boolean types. Code Sample 2-33. Method Handling Boolean Attributes and Properties /** * Sets a component boolean property as a value binding, or boolean literal. * * @param component the Faces component * @param attrName the attribute name * @param value the attribute value */ protected void setBooleanProperty( UIComponent component, String attrName, String value) { if (value == null) return; if (isValueReference(value)) { component.setValueBinding(attrName, createValueBinding(value)); } else { component.getAttributes().put(attrName, Boolean.valueOf(value)); } } The setValueBindingProperty() method, as shown in Code Sample 2-34, is simpler in its construction since it will be used by only those attributes that do not support a literal value and accept only a value-binding expression. If the value passed does not conform to EL expression syntax, it throws an IllegalArgumentException. Code Sample 2-34. Method Handling ValueBinding Attributes and Properties /** * Sets a * * @param * @param * @param */ component property as a value binding. component attrName value the Faces component the attribute name the attribute value

XElement xErrorMessage = new XElement("HTMLMessage", new XCData("<H1>Invalid user id or password.</H1>")); Console.WriteLine(xErrorMessage); This code produces the following output: <HTMLMessage><![CDATA[<H1>Invalid user id or password.</H1>]]></HTMLMessage> As you can see, the LINQ to XML API makes handling CData simple.

While the LINQ to XML API does support XSLT transformations, there are some very effective ways to produce transformations using the LINQ to XML API itself. Logically speaking, a transformation can be as simple as combining a functionally constructed XML tree with an embedded XML query.

Of course, creating, modifying, and deleting XML data does no good if you cannot persist the changes. This section contains a few ways to output your XML.

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I will explain XML transformations via an example. In many of the examples in the LINQ to XML chapters, I have worked with the following XML tree: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants> Let s pretend that I need to transform this XML tree to this: <MediaParticipants type="book"> <Participant Role="Author" Name="Joe Rattz" /> <Participant Role="Editor" Name="Ewan Buckingham" / > </MediaParticipants> To accomplish this transformation, I will use functional construction with an embedded query. With this approach, you basically functionally construct a new document matching the desired output XML tree structure while obtaining the needed data from the original source XML document by performing a LINQ to XML query. It is the desired output XML tree structure that drives your functional construction and query logic. Because this task is slightly more complex than some of the previous LINQ to XML examples, I will explain this one as I go. The code is shown in Listing 9-6. Listing 9-6. Transforming an XML Document XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); Console.WriteLine("Here is the original XML document:"); Console.WriteLine("{0}{1}{1}", xDocument, System.Environment.NewLine); The previous code simply creates the original source XML document that I am going to transform and displays it. Next, I need to build the new document and root element:

protected void setValueBindingProperty( UIComponent component, String attrName, String value) { if (value == null) return; if (!isValueReference(value)) throw new IllegalArgumentException(); component.setValueBinding(attrName, createValueBinding(value)); } For the ProInputDate component, you want to provide support for the valueChangeListener attribute, and therefore you need to handle method-binding expressions, as illustrated in Code Sample 2-35. Code Sample 2-35. Method Handling MethodBinding Attributes and Properties /** * Sets a component property as a method binding. * * @param component the Faces component * @param attrName the attribute name * @param value the attribute value * @param signature the method signature */ protected void setMethodBindingProperty( UIComponent component, String attrName, String value, Class[] signature) { if (value == null) return; Map attrs = component.getAttributes(); attrs.put(attrName, createMethodBinding(value, signature)); } A major difference between a MethodBinding and a ValueBinding is that not only do you have to provide the method expression, but you also have to provide the signature for the method specified by the method expression. For a valueChangeListener method, this means you need to pass the signature as a class array with one class ValueChangeEvent.class.

Saving with XDocument.Save()

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