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An iterator block is a code block with one or more yield statements. Any of the following three types of code blocks can be iterator blocks: A method body An accessor body An operator body Iterator blocks are treated differently than other blocks. Other blocks contain sequences of statements that are treated imperatively. That is, the first statement in the block is executed, followed by the subsequent statements, and eventually control leaves the block. An iterator block, on the other hand, is not a sequence of imperative commands to be executed at one time. Instead, it describes the behavior of an enumerator class that you want the compiler to build for you. The code in the iterator block describes how to enumerate the elements. Iterator blocks have two special statements: The yield return statement specifies the next item in the sequence to return. The yield break statement specifies that there are no more items in the sequence. The compiler takes this description of how to enumerate the items and uses it to build the enumerator class, including all the required method and property implementations. The resulting class is nested inside the class where the iterator is declared. Figure 20-8 shows the code on the left and the resulting objects on the right. Notice how much is built for you automatically by the compiler.

Another facet of the new XML-related APIs in Java 6 has to do with JSR 173 and the Streaming API for XML, or StAX. It is like SAX parsing, but works on pulling events from the parser, instead of the parser throwing events at you. It definitely does not follow the tree model of DOM, but does allow you to pause the parsing and skip ahead if necessary; and unlike SAX, it does allow writing of XML documents, not just reading. There are two parts to the StAX API: a Cursor API for walking the document from beginning to end, and an Iterator API for handling events in the order that they appear in the source document. You ll see how to use both, but first you need an XML document to read. Listing 6-15 shows one that represents a series of points, with x and y coordinates for each.

The following code illustrates how to use an iterator to create an enumerable class. MyClass, illustrated in Figure 20-8, uses iterator method BlackAndWhite to produce an enumerator for the class. MyClass also implements method GetEnumerator, which in turn calls BlackAndWhite, and returns the enumerator that BlackAndWhite returns to it. Notice that in Main, you can use an instance of the class directly in the foreach statement since the class is enumerable. class MyClass { public IEnumerator<string> GetEnumerator() { return BlackAndWhite(); } Returns an enumerator public IEnumerator<string> BlackAndWhite() { yield return "black"; yield return "gray"; yield return "white"; } } class Program { static void Main() { MyClass mc = new MyClass(); Use the instance of MyClass. foreach (string shade in mc) Console.WriteLine(shade); } } This code produces the following output: black gray white

The previous example created a class comprising two parts: the iterator that produced the enumerator and the GetEnumerator method that returned that enumerator. In this example, the iterator is used to create an enumerable rather than an enumerator. There are some important differences between this example and the last: In the previous example, iterator method BlackAndWhite returned an IEnumerator<string> and MyClass implemented method GetEnumerator by returning the object returned by BlackAndWhite. In this example, the iterator method BlackAndWhite returns an IEnumerable<string> rather than an IEnumerator<string>. MyClass, therefore, implements its GetEnumerator method by first calling method BlackAndWhite to get the enumerable object, and then calling that object s GetEnumerator method and returning its results. Notice that in the foreach statement in Main, you can either use an instance of the class or call BlackAndWhite directly, since it returns an enumerable. Both ways are shown. class MyClass { public IEnumerator<string> GetEnumerator() { IEnumerable<string> myEnumerable = BlackAndWhite(); // Get enumerable return myEnumerable.GetEnumerator(); // Get enumerator } Returns an enumerable public IEnumerable<string> BlackAndWhite() { yield return "black"; yield return "gray"; yield return "white"; } }

It s fundamentally important to see that, as opposed to a procedure-oriented list of commands, a data-oriented account is a sequential description. This is a huge shift in mind-set. It s also fundamentally important to see that a data-oriented step-by-step account of a function does not leave out any information. It s all there; it s just from a different point of view.