|
1 package com.thaiopensource.util;
2
3 public class OptionParser {
4 private final String  optionSpec;
5 private char optionChar = 0;
6 private String optionArg = null;
7 private int argIndex = 0;
8 private int currentOptionIndex = 0;
9 private final String [] args;
10
11 private static final char OPTION_CHAR = '-';
12
13 public static class MissingArgumentException extends Exception { }
14
15 public static class InvalidOptionException extends Exception { }
16
17 public OptionParser(String optionSpec, String [] args) {
18 this.optionSpec = optionSpec;
19 this.args = new String [args.length];
20 System.arraycopy(args, 0, this.args, 0, args.length);
21 }
22
23 public char getOptionChar() {
24 return optionChar;
25 }
26
27 public String getOptionCharString() {
28 return new String (new char[]{optionChar});
29 }
30
31 public String getOptionArg() {
32 return optionArg;
33 }
34
35 public boolean moveToNextOption()
36 throws InvalidOptionException, MissingArgumentException {
37 if (currentOptionIndex > 0
38 && currentOptionIndex == args[argIndex].length()) {
39 currentOptionIndex = 0;
40 argIndex++;
41 }
42 if (currentOptionIndex == 0) {
43 if (argIndex >= args.length)
44 return false;
45 String arg = args[argIndex];
46 if (arg.length() < 2 || arg.charAt(0) != OPTION_CHAR)
47 return false;
48 if (arg.length() == 2 && arg.charAt(1) == OPTION_CHAR) {
49 argIndex++;
50 return false;
51 }
52 currentOptionIndex = 1;
53 }
54 optionChar = args[argIndex].charAt(currentOptionIndex++);
55 optionArg = null;
56 int i = optionSpec.indexOf(optionChar);
57 if (i < 0 || (optionChar == ':' && i > 0))
58 throw new InvalidOptionException();
59 if (i + 1 < optionSpec.length() && optionSpec.charAt(i + 1) == ':') {
60 if (currentOptionIndex < args[argIndex].length()) {
61 optionArg = args[argIndex].substring(currentOptionIndex);
62 currentOptionIndex = 0;
63 argIndex++;
64 }
65 else if (argIndex + 1 < args.length) {
66 optionArg = args[++argIndex];
67 ++argIndex;
68 currentOptionIndex = 0;
69 }
70 else
71 throw new MissingArgumentException();
72 }
73 return true;
74 }
75
76 public String [] getRemainingArgs() {
77 String [] tem = new String [args.length - argIndex];
78 System.arraycopy(args, argIndex, tem, 0, tem.length);
79 return tem;
80 }
81
82 public static void main(String [] args) {
83 String optSpec = args[0];
84 String [] tem = new String [args.length - 1];
85 System.arraycopy(args, 1, tem, 0, tem.length);
86 args = tem;
87 OptionParser opts = new OptionParser(optSpec, args);
88 try {
89 while (opts.moveToNextOption()) {
90 System.err.print("option " + opts.getOptionChar());
91 String arg = opts.getOptionArg();
92 if (arg == null)
93 System.err.println(" (no argument)");
94 else
95 System.err.println(" arg=" + arg);
96 }
97 args = opts.getRemainingArgs();
98 for (int i = 0; i < args.length; i++)
99 System.err.println("arg=" + args[i]);
100 }
101 catch (OptionParser.MissingArgumentException e) {
102 System.err.println("missing argument for option " + opts.getOptionChar());
103 }
104 catch (OptionParser.InvalidOptionException e) {
105 System.err.println("invalid option " + opts.getOptionChar());
106 }
107 }
108 }
109 |
Popular Tags |
Java API By Example, From Geeks To Geeks.