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Because skeletal implementations are designed for inheritance, you should follow all of the design and documentation guidelines in Item 15 For brevity's sake, the documentation comments were omitted from the previous example, but good documentation is absolutely essential for skeletal implementations Using abstract classes to define types that permit multiple implementations has one great advantage over using interfaces: It is far easier to evolve an abstract class than it is to evolve an interface If, in a subsequent release, you want to add a new method to an abstract class, you can always add a concrete method containing a reasonable default implementation All existing implementations of the abstract class will then provide the new method This does not work for interfaces It is, generally speaking, impossible to add a method to a public interface without breaking all existing programs that use the interface Classes that previously implemented the interface will be missing the new method and won't compile anymore You could limit the damage somewhat by adding the new method to the skeletal implementation at the same time as you added it to the interface, but this really doesn't solve the problem Any implementation that didn't inherit from the skeletal implementation would still be broken Public interfaces, therefore, must be designed carefully Once an interface is released and widely implemented, it is almost impossible to change it You really must get it right the first time If an interface contains a minor flaw, it will irritate you and its users forever If an interface is severely deficient, it can doom the API The best thing to do when releasing a new interface is to have as many programmers as possible implement the interface in as many ways as possible before the interface is frozen This will allow you to discover any flaws while you can still correct them To summarize, an interface is generally the best way to define a type that permits multiple implementations An exception to this rule is the case where ease of evolution is deemed more important than flexibility and power Under these circumstances, you should use an abstract class to define the type, but only if you understand and can accept the limitations If you export a nontrivial interface, you should strongly consider providing a skeletal implementation to go with it Finally, you should design all of your public interfaces with the utmost care and test them thoroughly by writing multiple implementations.

public Object execute(ExecutionEvent event) throws ExecutionException { // Show a page in an internal web browser IWorkbenchWindow window = HandlerUtilgetActiveWorkbenchWindow(event); IWorkbenchBrowserSupport browserSupport = windowgetWorkbench()getBrowserSupport(); URL webUrl; try { webUrl = new URL("http://wwwqualityeclipsecom"); } catch (MalformedURLException e) { FavoritesLoglogError(e); return null; } IWebBrowser browser; try { browser = browserSupportcreateBrowser( IWorkbenchBrowserSupportAS_EDITOR, null, "Quality Eclipse", "The Quality Eclipse website"); browseropenURL(webUrl); } catch (PartInitException e) { FavoritesLoglogError(e); return null; } return null; }

If you are building an RCP application and not building on top of the Eclipse Workbench, you will need to extract some functionality from the orgeclipseuibrowser plug-in and build on top of the basic browser support provided in the SWT and JFace plug-ins If you head down this path, be sure to review DefaultBrowserSupport, WebBrowserEditor, and BrowserViewer in the orgeclipseuibrowser plug-in and Browser in the orgeclipseswt plug-in

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Our medianh header cannot contain just this declaration; we must also include any names that the declaration itself uses This declaration uses vector, so we must make sure that that name is available before the compiler sees our declaration:

The orgeclipsehelpuibrowserLaunchURL class provides another mechanism for opening a browser This action delegate, part of the orgeclipsehelpui plug-in, can be used to add a workbench menu (see Section 663, Defining a menu item and toolbar button, on page 245) that opens a browser on a predefined Web page (reading the code, this action appears to have cross-platform support, but we ve only tried this on Windows) For example, in the Favorites product, you could add a new action to the top-level Favorites menu by adding the following declaration to the Favorites ActionSet in the plug-in manifest

// medianh #include <vector> double median(std::vector<double>);

<action id="comqualityeclipsefavoritesbrowseWeb" menubarPath="comqualityeclipsefavoritesworkbenchMenu/content" label="Browse QualityEclipse" icon="icons/webgif" style="push" tooltip="Use the LaunchURL class to open a browser" class="orgeclipsehelpuibrowserLaunchURL" url="http://wwwqualityeclipsecom"/>

When a class implements an interface, the interface serves as a type that can be used to refer to instances of the class That a class implements an interface should therefore say something about what a client can do with instances of the class It is inappropriate to define an interface for any other purpose One kind of interface that fails this test is the so-calledconstant interface Such an interface contains no methods; it consists solely of static final fields, each exporting a constant Classes using these constants implement the interface to avoid the need to qualify constant names with a class name Here is an example:

The url attribute in the declaration above specifies the Web page displayed by the LaunchURL action delegate Unfortunately, the plug-in manifest editor does not support the url attribute, so you must switch to the pluginxml page to hand-code the attribute In addition, there does not appear to be a command equivlent for this action delegate

We include the vector header so that we can use the name std::vector in declaring the argument to median The reason that we mention std::vector explicitly, rather than writing a using-declaration, is more subtle In general, header files should declare only the names that are necessary By restricting the names contained in a header file, we can preserve maximum flexibility for our users For example, we use the qualified name for std::vector because we have no way of knowing how the user of our median function wants to refer to std::vector Users of our code might not want a using-declaration for vector If we write one in our header, then all programs that include our header get a using std::vector declaration, regardless of whether they wanted it Header files should use fully qualified names rather than using-declarations There is one last detail to cover: Header files should ensure that it is safe to include the file more than once as part of compiling the program As it happens, our header file is already safe as it stands, because it contains only declarations However, we consider it good practice to cater to multiple inclusion in every header file, not just the ones that need it We do so by adding some preprocessor magic to the file:

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