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An application developer can attach a custom Converter or Validator to an input component in the JSP document. It is important not to reference either the Converter or the Validator during rendering until encodeEnd() because a custom Converter or Validator will not be attached to the component until after encodeBegin() has completed. Therefore, you will avoid using encodeBegin() for your HtmlInputDateRenderer and instead do the majority of the rendering in encodeEnd(). Code Sample 2-11 shows the endcodeEnd() method s two arguments. Code Sample 2-11. The encodeEnd() Method s Arguments public class HtmlInputDateRenderer extends HtmlRenderer { public void encodeEnd( FacesContext context, UIComponent component) throws IOException { The encodeEnd() method takes two arguments FacesContext context and UIComponent component. The Render Response phase will call the encodeEnd() method on the UIComponent, which in turn will delegate to the encodeEnd() method on the Renderer, passing the FacesContext and the UIComponent instance. In this case, you are guaranteed to be passed an instance of UIInput, but you might also be passed a renderer-specific subclass of UIInput. If a cast is needed, you always cast to the behavioral superclass, rather than to a renderer-specific subclass. Looking Up Attribute Values A component such as the one you are creating usually contains a set of renderer-specific attributes, such as title, width, and height. For the inputDate component, you previously determined that you needed HTML attributes value, title, and name. These HTML attributes are rendered using the behavioral component s clientId and converted value attribute. You must also render the markup-specific attributes, so in Code Sample 2-12, you look up the renderer-specific title attribute in the UIComponent attribute s Map.

Employee emp = Employee.GetEmployeesArray() .ElementAt(3); Console.WriteLine("{0} {1}", emp.firstName, emp.lastName); We specified that we want the element whose index is 3, which is the fourth element. Here are the results of the query: David Lightman

I know that first line is actually shorter, but don t forget that there is a named method declared somewhere else defining what the method does. Of course, if that filtering logic is going to be reused in several places, or perhaps if the algorithm is complex and should only be trusted to a specialized developer, it may make more sense to create a named method to be consumed by other developers.

The ElementAtOrDefault operator returns the element from the source sequence at the specified index.

Complex or reused algorithms may be better served by named methods so they can be reused by any developer without that developer necessarily understanding the algorithm.

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Optionally, you can cast the component to a renderer-specific subclass and use the getters directly to look up the renderer-specific attributes. However, for similar reasons as those described in 1, you need to make sure your Renderer works even if an application developer creates a new UIInput programmatically, sets the renderer type, and adds it to the component hierarchy. The following code is an extract from a sample backing bean and illustrates how an application developer would add a UIInput component to the component hierarchy programmatically: public void setBinding( UIPanel panel) { UIInput input = new UIInput(); input.setRendererType("com.apress.projsf.Date"); Map attrs = input.getAttributes(); attrs.put("title", "Programmatic Date Field"); panel.getChildren().add(input); } This sample would cause a ClassCastException to occur if you always cast to the renderer-specific component subclass in your Renderer, instead of casting to the UIInput behavioral superclass.

public static T ElementAtOrDefault<T>( this IEnumerable<T> source, int index); If the sequence implements IList<T>, the IList interface is used to retrieve the indexed element directly. If the sequence does not implement IList<T>, the sequence will be enumerated until the indexed element is reached. If the index is less than zero or greater than or equal to the number of elements in the sequence, default(T) is returned. For reference and nullable types, the default value is null. This is the behavior that distinguishes it from the ElementAt operator.

Employee emp = Employee.GetEmployeesArray() .ElementAtOrDefault(3); Console.WriteLine(emp == null "NULL" : string.Format("{0} {1}", emp.firstName, emp.lastName)); Here are the results of the query: David Lightman Just as expected, the element at index 3 is retrieved. Now we will try a query with an invalid index using the code in Listing 5-36.

Whether named methods, anonymous methods, or lambda expressions are used is up to the developer. Use whatever makes the most sense for the situation at hand. You will often take advantage of lambda expressions by passing them as arguments to your LINQ query operator calls. Since every LINQ query is likely to have unique or scarcely reused operator lambda expressions, this provides the flexibility of specifying your operator logic without having to create named methods for virtually every query.

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