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1 package console;
2
3 import java.io.BufferedReader  ;
4 import java.io.InputStreamReader ;
5 import java.util.Collection ;
6 import java.util.Arrays ;
7 import java.lang.reflect.Method ;
8
9
10 public class Main {
11 private static Collection QUIT_COMMANDS = Arrays.asList(new String [] {"quit", "q", "exit"});
12 private static Collection HELP_COMMANDS = Arrays.asList(new String [] {"help", "h", "?"});
13
14 public static void main(String [] a) throws Exception {
15 BufferedReader in = new BufferedReader (new InputStreamReader (System.in));
16 while (true) {
17 System.out.print("> ");
18 String command = in.readLine().trim();
19 if (QUIT_COMMANDS.contains(command)) {
20 return;
21 }
22 if (HELP_COMMANDS.contains(command)) {
23 help();
24 continue;
25 }
26 String [] split = command.split(" ");
27 if (split.length == 0) {
28 error(command);
29 continue;
30 }
31
32 try {
33 String [] args = new String [split.length - 1];
34 System.arraycopy(split, 1, args, 0, args.length);
35 Class cl = Class.forName(split[0]+".Main");
36 Method m = cl.getMethod("main", new Class [] {String [].class});
37 m.invoke(null, new Object [] {args});
38 } catch (Exception ex) {
39 error(command);
40 continue;
41 }
42 }
43 }
44
45 private static void help() {
46 System.out.println("available commands:");
47 System.out.println("\tquit: quit the console");
48 System.out.println("\thelp: displays this message");
49 System.out.println("\tlist -dir <dir>: list files in given directory");
50 System.out.println("\tfind -dir <dir> -name <name>: list files with given name in given dir");
51 System.out.println("\tsizewhere -dir <dir> -name <name>: compute total size of files with given name in given dir");
52 System.out.println("\thelp: displays this message");
53 }
54
55 private static void error(String command) {
56 System.out.println("unknown command "+command);
57 System.out.println("type ? for help");
58 }
59
60 }
61 |
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Java API By Example, From Geeks To Geeks.