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1 package com.thaiopensource.util;
2
3 import java.net.URL  ;
4 import java.net.MalformedURLException ;
5 import java.io.File ;
6
7 public class UriOrFile {
8 private UriOrFile() {
9 }
10
11 public static String toUri(String uriOrFile) {
12 if (!hasScheme(uriOrFile)) {
13 try {
14 return fileToUri(uriOrFile);
15 }
16 catch (MalformedURLException e) { }
17 }
18 return uriOrFile;
19 }
20
21 private static boolean hasScheme(String str) {
22 int len = str.length();
23 if (len == 0)
24 return false;
25 if (!isAlpha(str.charAt(0)))
26 return false;
27 for (int i = 1; i < len; i++) {
28 char c = str.charAt(i);
29 switch (c) {
30 case ':':
31 return i == 1 ? false : true;
33 case '+':
34 case '-':
35 break;
36 default:
37 if (!isAlnum(c))
38 return false;
39 break;
40 }
41 }
42 return false;
43 }
44
45 private static boolean isAlpha(char c) {
46 return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
47 }
48
49 private static boolean isAlnum(char c) {
50 return isAlpha(c) || ('0' <= c && c <= '9');
51 }
52
53 public static String fileToUri(String file) throws MalformedURLException {
54 return fileToUri(new File (file));
55 }
56
57 public static String fileToUri(File file) throws MalformedURLException {
58 String path = file.getAbsolutePath().replace(File.separatorChar, '/');
59 if (path.length() > 0 && path.charAt(0) != '/')
60 path = '/' + path;
61 return new URL ("file", "", path).toString();
62 }
63
64 public static String uriToUriOrFile(String uri) {
65 if (!uri.startsWith("file:"))
66 return uri;
67 uri = uri.substring(5);
68 int nSlashes = 0;
69 while (nSlashes < uri.length() && uri.charAt(nSlashes) == '/')
70 nSlashes++;
71 File f = new File (uri.substring(nSlashes).replace('/', File.separatorChar));
72 if (f.isAbsolute())
73 return f.toString();
74 return uri.replace('/', File.separatorChar);
75 }
76
77 static public void main(String [] args) {
78 System.err.println(uriToUriOrFile(args[0]));
79 }
80 }
81 |
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Java API By Example, From Geeks To Geeks.