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Certain types of unmanaged objects are limited in number or expensive with system resources. It is important that when your code is done with them they be released as soon as possible. The using statement helps simplify the process and ensure that these resources are properly disposed of. A resource is a class or struct that implements the System.IDisposable interface. Interfaces are covered in detail in 17 but in short, an interface is a collection of unimplemented function members that classes and structs can choose to implement. The IDisposable interface contains a single method named Dispose. The phases of using a resource are shown in Figure 9-10, and consist of the following: Allocating the resource Using the resource Disposing of the resource If an unexpected runtime error occurs during the portion of the code using the resource, the code disposing of the resource might not get executed.

Note The using statement is different than the using directives. The using directives are covered in

Without the call to table.convertRowIndextoModel(), printing the set of selected rows will print the set of selected rows for the current view of the model, whether sorted or otherwise. Once the conversion call is added, the selected row gets mapped back to the position in the original model. From here, you can print it, manipulate it, and so on. There is also another method, convertRowIndexToView(), which takes a row from the source table model and determines which row in the sorted model it maps to.

A network of function sets actually has an embedded structure a breakdown of its types of function sets. A network can be seen to be most simply a virtual hierarchy, with loose connections.

10.

To discover when a table-resorting operation happens, attach a RowSorterListener to RowSorter Tip

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The using statement helps reduce the potential problem of an unexpected runtime error by neatly packaging the use of a resource. There are two forms of the using statement. The first form is the following, and is illustrated in Figure 9-11. The code between the parentheses allocates the resource. Statement is the code that uses the resource. The using statement implicitly generates the code to dispose of the resource. using ( ResourceType Identifier = Expression ) Statement Allocates resource Uses resource Unexpected runtime errors are called exceptions, and are covered in 11. The standard way of handling the possibility of exceptions is to place the code that might cause an exception in a try block, and place any code that must be executed, whether or not there is an exception, into a finally block. This form of the using statement does exactly that. It performs the following: Allocates the resource Places Statement in a try block Creates a call to the resource s Dispose method and places it in a finally block.

Dependence is a network in its simplest form, because it has no structure. In the next simplest (and more common) form, a function set network has static composition hierarchies. Beginning to be complex, this network can be functionally extended with dynamic composition. More complex, the differing types of function sets can be brought together only through application classes (or groups of classes) and their static composition. (This type of connection is a Mediator mechanism type, and a system that uses only these canbe said to have a Mediator architecture [or a segmented-Mediator architecture].) And most complex, the application classes can have dynamic composition. Any network can have combinations of all of these. The reason why the more complex connections are often better is that they make the network structure more flexible. Actually, a network connected entirely through dependence is much worse than an application-oriented system, because it has much more complexity (of logic spread over many modules and a lot of jumping around at execution) but no more benefit. And a network connected entirely through application classes with only dynamic composition is, on its own, usually too complex for any of its benefits. A significant exception is when this is handled through a third-party framework that uses a parameter description file as the dynamic composition; an example of this type of framework is Spring.

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