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public IEnumerator GetEnumerator() { return _elements.GetEnumerator(); } public void Accept( IVisitor visitor) { visitor.Process( this); } } public class VisitorImplementation : IVisitor { public void Process< type>(type parameter) where type: class{ if( parameter is CollectionClass) { Console.WriteLine( "CollectionClass"); CollectionClass cls = parameter as CollectionClass; foreach( SingleClass item in cls) { item.Accept( this); } } else if( parameter is SingleClass) { SingleClass cls = parameter as SingleClass; Console.WriteLine( "SingleClass (" + cls.Buffer + ")"); } } } In this implementation variation, the methods CollectionClass.Accept and SingleClass.Accept have been kept minimal. The iteration of CollectionClass has been delegated to VisitorImplementation.Process. So which to use, IBase or IVisitor The answer is that there is no best approach. It really depends on the context, and what is desired. If IVisitor iterates the children, that is reinforcing the principle whereby the IVisitor implementation is responsible for all of the heavy lifting. The inspectees are kept simple. If IVisitor iterates the children, then when iterating the children, before and after events can be generated. This is because the IVisitor implementation is responsible for calling the children. If the inspectee iterates the children, then an IVisitor implementation only needs to react to the types that are of interest to it. This is useful when processing a hierarchy of objects and, for example, executing a running total on certain types. In this scenario, the IVisitor implementation doesn t know or need to know about the object hierarchy. Regardless of which IVisitor implementation is used, the Process method has to reference the types directly, and no attempt should be made to abstract the reference types of the IVisitor implementation.

these keys are stored in /etc/krb.keytab and must be kept secure (by default they are readable only by root). An attacker could use them to authenticate to the service without knowing the password of a given user.

Figure 12-46. Pulse width and shaft angle Unfortunately, the output of the NXT can t be used to directly create the control pulses for a couple of reasons: the voltage is too high, and you can t generate pulses as short as a few ms. However, you can make a little interface circuit that will generate the proper size pulses and use the NXT output to control the width of those pulses. The heart of the interface circuit is the LTC555 CMOS timer (see Figure 12-47).

The Visitor pattern is a good way to postprocess specific data types to extract specific pieces of information. The Visitor pattern could be combined with a closure functor to process certain types in certain contexts. Serialization is one way to use the Visitor pattern, but more often it s used to perform tasks that can only be done by accessing the implementation directly. Even though the Visitor pattern requires that an IVisitor implementation have a direct reference to the types it manipulates, the IVisitor implementation can be used generically. This makes it possible to use a factory and wire together an IBase implementation and IVisitor implementation without having the consumer of each know about the specific implementations.

Apple s built-in FTP server supports Kerberos authentication and can be used with third-party software to allow for better authentication security. By default, FTP transmits the session username and password via clear text. When using the Apple FTP server with a third-party client such as Fetch.app, the FTP client software can negotiate a GSSAPI connection using Kerberos. This allows the client to authenticate with a Kerberos ticket rather than a password. Although this does allow for better security during the authentication exchange, it does not prevent an attacker from watching the session data. Apple s current built-in FTP server does not support transport layer security such as SSL, while the OpenSSH suite does have a more secure protocol known as SFTP, which supports both Kerberos authentication and session layer security. Unfortunately, it cannot be easily configured via the graphic interface, and as a result, users effectively are not jailed (or trapped) within a specific directory such as their home folder or linked share points.

As mentioned earlier, another way to perform a serialization is to use the Memento pattern. The Memento pattern differs dramatically from the Visitor pattern and Serializer pattern in that it abstracts the state of an object from the object. The state transferred is the minimal amount of information needed to uniquely describe a type instance. The Memento pattern is similar to the Visitor pattern in that specific knowledge about the implementation is shared with another class. Where the Memento pattern differs from the Visitor pattern is that it s specifically geared towards transfer of state. Following is an overview of the theory behind the Memento pattern, followed by an example of how to use it in your code.

isolated subset of the filesystem. Because there are insecurities within FTP and use in Mac OS X, chroot can be used to further secure FTP. One easy way to obtain this functionality without a lot of command-line configuration is to use Rumpus, a web-enabled FTP application.

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