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To complete the UIComponentTagSupport class, you need to add two methods that can create and return a ValueBinding and a MethodBinding. Code Sample 2-36 shows the createValueBinding() and createMethodBinding() methods. Code Sample 2-36. The createValueBinding() and createMethodBinding() Methods /** * Returns a ValueBinding for the string value. * * @param value the attribute string value * * @return a parsed ValueBinding */ protected ValueBinding createValueBinding( String value) { FacesContext context = FacesContext.getCurrentInstance(); Application application = context.getApplication(); return application.createValueBinding(value); } /** * Returns a MethodBinding for the string value. * * @param value the attribute string value * @param signature the method binding signature * * @return a parsed MethodBinding */ protected MethodBinding createMethodBinding( String value, Class[] signature) { FacesContext context = FacesContext.getCurrentInstance(); Application application = context.getApplication(); return application.createMethodBinding(value, signature); } }

Saving with XElement.Save()

There are a few tips to pass on when it comes to performing XML transformations with the LINQ to XML API. While you may not have a need for these, there is no reason not to point them out.

We have said many times that with the LINQ to XML API, creating an XML document is not necessary. And to save your XML to a file, it still isn t. The XElement class has several Save methods for this purpose: void void void void void XElement.Save(string filename); XElement.Save(TextWriter textWriter); XElement.Save(XmlWriter writer); XElement.Save(string filename, SaveOptions options); XElement.Save(TextWriter textWriter, SaveOptions options);

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There is no requirement that every bit of code needed to perform a transformation or query actually exist in the transformation code itself. It is possible to create helper methods that carry out more complex transformation chores. Here is some code demonstrating how you can create a helper method to break up a more complex task: A Helper Method to Transform an XML Document static IEnumerable<XElement> Helper() { XElement[] elements = new XElement[] { new XElement("Element", "A"), new XElement("Element", "B")}; return(elements); } In Listing 9-7, I begin the construction of an XML tree. It creates the root node, named RootElement, in the call to the constructor itself. To create the child nodes, it calls a helper method named Helper. It isn t important what the helper method is doing specifically, it just matters that it is helping me build some part of my XML tree and that the call to the method can be embedded in the functional construction of the XML tree. Listing 9-7. Using a Helper Method to Transform an XML Document XElement xElement = new XElement("RootElement", Helper()); Console.WriteLine(xElement); Here are the results of this code: <RootElement> <Element>A</Element> <Element>B</Element> </RootElement> Remember, as I discussed in 7, the XElement constructor knows how to handle IEnumerable<T>, which happens to be the returned data type of my Helper method. How cool is that

Listing 7-37 is an example very similar to the previous, except we never even create an XML document.

The createMethodBinding() method evaluates the specified method-binding expression and creates a MethodBinding instance. The method referenced by the expression is called when the MethodBinding is executed. When the method is called, certain parameters are passed to the backing bean method, such as a ValueChangedEvent for the MethodBinding attached to the valueChangeListener attribute. The MethodBinding must dynamically look up the right method signature to make sure it calls the right method.

XElement bookParticipants = new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XAttribute("language", "English"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz"))); bookParticipants.Save("bookparticipants.xml"); And the saved XML looks identical to the previous example where we actually have an XML document: < xml version="1.0" encoding="utf-8" > <BookParticipants> <BookParticipant type="Author" experience="first-time" language="English"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants>

There may be times when you want to suppress some nodes from being constructed for one reason or another. Perhaps some essential data is missing from the source that causes you to want to omit an element from being created, or perhaps the data is such that you want to skip it.

Creating and persisting XML to a file does no good if you can t load it back into an XML tree. Here are some techniques to read XML back in.

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