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There are several other important points you should know about namespaces: Every type name in a namespace must be different from all the others. The types in a namespace are called members of the namespace. A source file can contain any number of namespace declarations, either sequentially or nested. Figure 10-6 shows a source file on the left that declares two namespaces sequentially, with several types in each one. Notice that even though the namespaces contain several class names in common, they are differentiated by their namespace names, as shown in the assembly at the right of the figure.

Another thing you can do with the Activation Framework is map files to mime types. This is something your e-mail client typically does to see if it knows how to handle a particular attachment. The program in Listing 1-2 displays the mime types that it thinks are associated with the files in a directory identified from the command line.

Figure 10-6. Multiple namespaces in a source file The .NET Framework BCL offers thousands of defined classes and types to choose from in building your programs. To help organize this array of available functionality, types with related functionality are declared in the same namespace. The BCL uses more than 100 namespaces to organize its types.

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Ultimately, anchoring in structure is very objective, which makes it a very solid guide. It is driven by analysis of functional significance, which requires the whole system to be kept in mind, continually. From the structure direction, once the function sets are identified, each system objective is broken down, and the component functions fall into the appropriate set. Anchoring in nonstructure is very subjective, which makes it a very risky guide,

import javax.activation.*; import java.io.*; public class FileTypes { public static void main(String args[]) { FileTypeMap map = FileTypeMap.getDefaultFileTypeMap(); String path; if (args.length == 0) { path = "."; } else { path = args[0]; } File dir = new File(path); File files[] = dir.listFiles(); for (File file: files) { System.out.println(file.getName() + ": " + map.getContentType(file)); } } }

A namespace is not closed. This means that you can add more type declarations to it by declaring it again either later in the source file or in another source file. For example, Figure 10-7 shows the declaration of three classes, all in the same namespace, but declared in separate source files. The source files can be compiled into a single assembly, as shown in Figure 10-7, or into separate assemblies, as shown in Figure 10-8.

A namespace can be a member of another namespace. The member is called a nested namespace. Nesting namespaces allows you to create a conceptual hierarchy of types. Although the nested namespace is a member of the enclosing namespace, its members are not members of the enclosing namespace. A common misconception people initially have about nested namespaces is that since the nested namespace is inside the enclosing namespace, the members of the nested namespace must be a subset of the enclosing namespace. This is not true; the namespaces are separate. There are two ways you can declare a nested namespace: Textual nesting: You can create a nested namespace by placing its declaration inside the declaration body of the enclosing namespace. This is illustrated on the left in Figure 10-9. In this example, namespace OtherNs is nested in namespace MyNamespace. Separate declaration: You can also create a separate declaration for the nested namespace, but you must use its fully qualified name in the declaration. This is illustrated on the right in Figure 10-9. Notice that in the declaration of nested namespace OtherNs, the fully qualified name MyNamespace.OtherNS is used.

The default implementation of the FileTypeMap class is its MimetypesFileTypeMap subclass. This does a mapping of file extensions to mime types. Theoretically, you could create your own subclass that examined the first few bytes of a file for its magic signature (for instance, 0xCAFEBABE for .class files). The output from running the program is dependent on the directory you run it against. With no command-line argument, the current directory is used as the source:

with a wider range of possible outcomes. It is driven by analysis of sequential execution, which keeps focus on system segments. Done well, a nonstructure is more flexible in building multiple structures; done poorly, a nonstructure makes building any structure extremely tedious.

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