1 package fr.in2p3.jsaga.impl.url;
2
3 import java.io.File;
4 import java.io.IOException;
5
6 /* ***************************************************
7 * *** Centre de Calcul de l'IN2P3 - Lyon (France) ***
8 * *** http://cc.in2p3.fr/ ***
9 * ***************************************************
10 * File: UniversalFile
11 * Author: Sylvain Reynaud (sreynaud@in2p3.fr)
12 * ***************************************************
13 * Description: */
14
15 /**
16 *
17 */
18 public class UniversalFile {
19 private File m_file;
20 /**
21 * Indicate if this file is absolute
22 */
23 private boolean m_isAbsolute;
24
25 /**
26 * Indicate if this file is a directory
27 */
28 private boolean m_isDir;
29
30 /**
31 * Build an universal file (Windows and Unix)
32 * @param path
33 *
34 * If the path ends with / or \, it is a directory
35 * On Unix, if the path starts with /, the file is considered as absolute
36 * On Windows, if the path starts with / or \ or X:/, the file is considered as absolute
37 */
38 public UniversalFile(String path) {
39 // remove leading duplicated /
40 while (path.startsWith("//")) {
41 path = path.substring(1);
42 }
43 m_file = new File(path);
44 m_isAbsolute = m_file.isAbsolute() || path.startsWith("/") || path.startsWith("\\");
45 m_isDir = path.endsWith("/") || path.endsWith("\\");
46 }
47
48 /**
49 * returns the path of the file with all separators converted as /
50 * and with a trailing / if the file is a directory
51 * @return the path of the file
52 */
53 public String getPath() {
54 return m_file.getPath().replace("\\", "/") + (m_isDir?"/":"");
55 }
56
57 /**
58 * returns the parent directory of the file with all separators converted as / and with a trailing /
59 * @return the path of the parent directory
60 */
61 public String getParent() {
62 String parent = m_file.getParent();
63 if (parent == null) {
64 return "./";
65 }
66 parent = parent.replace("\\", "/");
67 if (! "/".equals(parent)) {
68 parent = parent + "/";
69 }
70 return parent;
71 }
72
73 /**
74 * returns the canonical path of the file with all separators converted as /
75 * and with a trailing / if the file is a directory.
76 * It removes all "./" and remove recursively all "dir/../" sets
77 * @return the canonical path of the file
78 * @throws IOException
79 *
80 * To compute the canonical path, the method java.io.File.getCanonicalPath() is not used
81 * because this method first converts this pathname to absolute form if necessary, as if by
82 * invoking the getAbsolutePath() method and some characters are not supported by Windows
83 *
84 */
85 public String getCanonicalPath() throws IOException {
86 String canon;
87 java.util.Stack path = new java.util.Stack();
88 for (String pathElement : getPath().split("/")) {
89 if (pathElement.equals("..")) {
90 // remove last element if stack is not empty and last element is not ".." itself
91 if (path.empty() || path.peek().equals("..")) {
92 path.add(pathElement);
93 } else {
94 path.pop();
95 }
96 } else if (! pathElement.equals(".") && !pathElement.equals("")) { // NOT "." and not ""
97 path.add(pathElement);
98 } // otherwise (".." or ""): nothing to do
99 }
100 if (getPath().startsWith("/")) {
101 canon = "/";
102 } else {
103 canon = "";
104 }
105 for (int i = 0; i < path.size(); i++) {
106 canon += (String)path.get(i);
107 if (i == path.size()-1) { // last element : add / only for Dir
108 canon += m_isDir?"/":"";
109 } else {
110 canon += "/";
111 }
112 }
113 // if everything was removed, it means the path is "./"
114 if (canon.equals("")) { canon = "./";}
115 return canon;
116 }
117
118 public boolean isAbsolute() {
119 return m_isAbsolute;
120 }
121
122 public boolean isDirectory() {
123 return m_isDir;
124 }
125
126 }