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Java > Open Source Codes > org > jfree > io > FileUtilities


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ------------------
28  * FileUtilities.java
29  * ------------------
30  * (C) Copyright 2000-2004, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: FileUtilities.java,v 1.5 2005/10/18 13:16:02 mungady Exp $
36  *
37  * Changes (from 5-Nov-2001)
38  * -------------------------
39  * 05-Nov-2001 : Changed package to com.jrefinery.io.* (DG);
40  * 04-Mar-2002 : Renamed Files.java --> FileUtilities.java (DG);
41  * 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
42  *
43  */
44
45 package org.jfree.io;
46
47 import java.io.File JavaDoc;
48 import java.util.StringTokenizer JavaDoc;
49
50 /**
51  * A class containing useful utility methods relating to files.
52  *
53  * @author David Gilbert
54  */
55 public class FileUtilities {
56
57     /**
58      * To prevent unnecessary instantiation.
59      */
60     private FileUtilities() {
61     }
62
63     /**
64      * Returns a reference to a file with the specified name that is located
65      * somewhere on the classpath. The code for this method is an adaptation
66      * of code supplied by Dave Postill.
67      *
68      * @param name the filename.
69      *
70      * @return a reference to a file or <code>null</code> if no file could be found.
71      */
72     public static File JavaDoc findFileOnClassPath(final String JavaDoc name) {
73
74         final String JavaDoc classpath = System.getProperty("java.class.path");
75         final String JavaDoc pathSeparator = System.getProperty("path.separator");
76
77         final StringTokenizer JavaDoc tokenizer = new StringTokenizer JavaDoc(classpath, pathSeparator);
78
79         while (tokenizer.hasMoreTokens()) {
80             final String JavaDoc pathElement = tokenizer.nextToken();
81
82             final File JavaDoc directoryOrJar = new File JavaDoc(pathElement);
83             final File JavaDoc absoluteDirectoryOrJar = directoryOrJar.getAbsoluteFile();
84
85             if (absoluteDirectoryOrJar.isFile()) {
86                 final File JavaDoc target = new File JavaDoc(absoluteDirectoryOrJar.getParent(), name);
87                 if (target.exists()) {
88                     return target;
89                 }
90             }
91             else {
92                 final File JavaDoc target = new File JavaDoc(directoryOrJar, name);
93                 if (target.exists()) {
94                     return target;
95                 }
96             }
97
98         }
99         return null;
100
101     }
102
103 }
104
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