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This makes no sense, but the C# compiler doesn t know that after all, we told it the property s type was int, so how s it supposed to know that s wrong Fortunately, the designers of C# have thought of this, and have given us a kind of type for precisely this situation, called an enum, and it turns out to be a much better solution for this than const int.

The enum keyword lets us define a type whose values can be one of a fixed set of possibilities. Example 3-21 declares an enum for our Direction property. You can add this to an existing source file, above or below the Plane class, for example. Alternatively, you could add a whole new source file to the project, although Visual Studio doesn t offer a file template for enum types, so either you d have to add a new class and then change the class keyword to enum, or you could use the Code File template to add a new, empty source file.

enum DirectionOfApproach { Approaching, Leaving }

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This is similar in some respects to a class declaration. We can optionally begin with a protection level but if, like Example 3-21, we omit that, we get internal protection by default. Then there s the enum specifier itself, followed by the name of the type, which by convention we PascalCase. Inside the braces, we declare the members, again using PascalCasing. Notice that we use commas to separate the list of constants this is where the syntax starts to part company with class. Unusually, the members are publicly accessible by default. That s because an enum has no behavior, and so there are no implementation details it s just a list of named values, and those need to be public for the type to serve any useful purpose.

public class AESEncrypter { public static final int IV_SIZE = 16; // 128 bits public static final int KEY_SIZE = 16; // 128 bits public static final int BUFFER_SIZE = 1024; // 1KB Cipher cipher; SecretKey secretKey; AlgorithmParameterSpec ivSpec; byte[] buf = new byte[BUFFER_SIZE]; byte[] ivBytes = new byte[IV_SIZE];

It s short for enumeration, by the way. So it s often pronounced e-noom or, depending on where you re from, e-nyoom. However, some developers (and one of the authors) ignore the etymology and pronounce it ee numb because that s how it looks like it should sound.

Notice that we ve chosen to call this DirectionOfApproach, and not the plural DirectionsOfApproach. By convention, we give enum types a singular name even though they usually contain a list. This makes sense because when you use named entries from an enumeration, you use them one at a time, and so it would look odd if the type name were plural. Obviously, there won t be any technical consequences for breaking this convention, but following it helps make your code consistent with the .NET Framework class libraries.

We can now declare our Direction property, using the enumeration instead of an integer. Example 3-22 shows the property to add to the Plane class.

public DirectionOfApproach Direction { get; set; }

This chapter examined how blocks are defined with XML and executed with JavaScript. You examined the RSS and News Reader blocks from previous examples to see how the block definitions and code are used together. You learned about the Popfly Runtime Environment (PRE) and some of the helper functions it provides to make retrieving data from external sources easier. In the next chapter, we will dig deeper into creating blocks by examining the Popfly Block SDK and the tools used to build and debug blocks.

There are some optional features we can use in an enum declaration. Example 3-23 uses these, and they provide some insight into how enum types work.

The imports at the top of the program simply declare that our program uses the Java security and cryptography support packages, in addition to the I/O library The IV_SIZE and KEY_SIZE for our AESEncrypter class are defined to be 16 bytes, or 128 bits BUFFER_SIZE specifies the size of the buffer that will be used to read in chunks of the input and write chunks of output AESEncrypter uses a cipher object, defined in the Java cryptography library, that will be used to actually do the encryption or decryption, as specified by the program s command-line arguments The secretKey object will store the secret, symmetric key that will be used The ivSpec object will specify the IV to be used to initialize the CBC The ivSpec object is initialized using bytes from ivBytes.

enum DirectionOfApproach : int { Approaching = 0, Leaving = 1 }

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