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class MyColors: IEnumerable { string[] Colors = { "Red", "Yellow", "Blue" }; public IEnumerator GetEnumerator() { return new ColorEnumerator(Colors); } } class Program { static void Main() { MyColors mc = new MyColors(); foreach (string color in mc) Console.WriteLine("{0}", color); } } }

SOAPPart soapPart = soapMessage.getSOAPPart(); Source source = soapPart.getContent(); Node root = generateDOM(source); dumpDocument(root); KeyPair keypair = generateDSAKeyPair(); XMLSignature sig = generateXMLSignature(keypair); System.out.println("Signing the message..."); signTree(root, keypair.getPrivate(), sig); dumpDocument(root); System.out.println("Validate the signature..."); boolean valid = validateXMLSignature(keypair.getPublic(), root, sig); System.out.println("Signature valid " + valid); } private static SOAPMessage createSOAPMessage() throws SOAPException { SOAPMessage soapMessage = MessageFactory.newInstance().createMessage(); SOAPPart soapPart = soapMessage.getSOAPPart(); SOAPEnvelope soapEnvelope = soapPart.getEnvelope(); SOAPHeader soapHeader = soapEnvelope.getHeader(); SOAPHeaderElement headerElement = soapHeader.addHeaderElement( soapEnvelope.createName("Signature", "SOAP-SEC", "http://schemas.xmlsoap.org/soap/security/2000-12")); SOAPBody soapBody = soapEnvelope.getBody(); soapBody.addAttribute(soapEnvelope.createName("id", "SOAP-SEC", "http://schemas.xmlsoap.org/soap/security/2000-12"), "Body"); Name bodyName =soapEnvelope.createName("FooBar", "z", "http://example.com"); SOAPBodyElement gltp = soapBody.addBodyElement(bodyName); return soapMessage; } private static Node generateDOM(Source source) throws ParserConfigurationException, SAXException, IOException {

You ve just seen how to use the IEnumerable and IEnumerator interfaces to create useful enumerables and enumerators. But there are several drawbacks to this method. First, remember that the object returned by Current is of type object. For value types, this means that before they are returned by Current, they must be boxed to turn them into objects. They must then be unboxed again after they have been received from Current. This can exact a substantial performance penalty if it needs to be done on large amounts of data. Another drawback of the non-generic interface method is that you ve lost type safety. The values being enumerated are being handled as objects, and so can be of any type. This eliminates the safety of compile-time type checking. You can solve these problems by making the following changes to the enumerator/ enumerable class declarations. For the enumerator class Do not derive the class from IEnumerator. Implement MoveNext just as before. Implement Current just as before, but have as its return type the type of the items being enumerated. You do not have to implement Reset. For the enumerable class Do not derive the class from IEnumerable. Implement GetEnumerator as before, but have its return type be the type of the enumerator class.

Function set network interaction algebra serves as a thorough notation for function set interaction mechanisms, to concisely communicate and clarify function relationships and to help to identify, complete, and describe any new mechanism types. Interactions are at the level of interfaces; in this pure abstraction, the f(x) notation is appropriate for parameters. Interaction algebra evidences that interaction mechanisms are, most clearly, techniques for manipulating, and thus maintaining, design variables. Ultimately, function orientation gets its frequently mentioned elegance from its algebraic properties; very simply, techniques for manipulating variables are elegant.

CHAPTER 6 EXTENSIBLE MARKUP LANGUAGE (XML)

Figure 20-5 shows the differences. The non-generic interface code is on the left, and the non-interface code is on the right. With these changes, the foreach statement will be perfectly happy to process your collection, but without the drawbacks just listed.

Figure 20-5. Comparing interface-based and non-interface-based enumerators One possible problem with the non-interface enumerator implementation is that types from other assemblies might expect enumeration to be implemented using the interface method. If these objects attempt to get an enumeration of your class objects using the interface conventions, they will not be able to find them. To solve this problem, you can implement both forms in the same classes. That is, you can create implementations for Current, MoveNext, Reset, and GetEnumerator at the class level, and also create explicit interface implementations for them. With both sets of implementations, the type-safe, more efficient implementation will be called by foreach and other constructs that can use the non-interface implementations, while the other constructs will call the explicit interface implementations.