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There are some important constraints on user-defined conversions. The most important are the following: You can only define user-defined conversions for classes and structs. You cannot redefine standard implicit or explicit conversions. The following is true for source type S and target type T: S and T must be different types. S and T cannot be related by inheritance. That is, S cannot be derived from T, and T cannot be derived from S. Neither S nor T can be an interface type or the type object. The conversion operator must be a member of either S or T. You cannot declare two conversions, one implicit and the other explicit, with the same source and target types.

This is just a skeleton web service; you need to put some meat on the bones before it becomes useful Workshop for WebLogic allows you to work either directly with the source code, or via property sheets One of the great things about property sheets is that they give you a menu of options, making it simple to see what s available to you Each of these properties translates directly into an annotation in the source file, so there s no hidden code The source files are still the source of truth, reflecting all the property and annotation settings For example, with the HelloWorldjava file selected in Workshop, look at the Annotations window (see Figure 3-5).

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The following code defines a class called Person that contains a person s name and age. The class also defines two implicit conversions. The first converts a Person object to an int value. The target int value is the age of the person. The second converts an int to a Person object. class Person { public string Name; public int Age; public Person(string name, int age) { Name = name; Age = age; } public static implicit operator int(Person p) { return p.Age; } public static implicit operator Person(int i) { return new Person("Nemo", i); } } class Program { static void Main( ) { Person bill = new Person( "bill", 25); Convert a Person object to an int. int age = bill; Console.WriteLine("Person Info: {0}, {1}", bill.Name, age); Convert an int to a Person object. Person anon = 35; Console.WriteLine("Person Info: {0}, {1}", anon.Name, anon.Age); } }

This code produces the following output: Person Info: bill, 25 Person Info: Nemo, 35 If you had defined the same conversion operators as explicit rather than implicit, then you would have needed to use cast expressions to perform the conversions, as shown here: Explicit ... public static explicit operator int( Person p ) { return p.Age; } ... static void Main( ) { ... Requires cast expression int age = (int) bill; ...

<property name="hibernate.generate_statistics">true</property> You can also enable live statistics programmatically by using the Statistics Interface: Statistics stats = sessionFactory.getStatistics(); stats.setStatisticsEnabled(true); Transaction tx = session.beginTransaction(); List<Book> books = session.createQuery("from Book").list(); for(Book bo : books) { System.out.println(bo); } stats.getSessionOpenCount(); stats.logSummary(); session.close();

At the top of this window is a group of properties under the title of WebService (if this group isn t open, click the plus sign next to the group name to show the child properties) Take a look at the name attribute of the WebService annotation By default it s set to [HelloWorld] The square brackets are an idiom specific to Workshop, and they indicate default values that will be used Maybe it s just our nature, but we ve never trusted default values, so we prefer to set them explicitly Remove the square brackets around the name property so that the name is now set to HelloWorld Notice how the @WebService annotation in your source code has been modified to include the name attribute Now set the serviceName field to HelloWorldService and set the targetNamespace field to http://wwwproalsbcom..

The user-defined conversions discussed so far have directly converted the source type to an object of the target type in a single step, as shown in Figure 18-26.

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