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Java > Open Source Codes > org > objectweb > petals > classloader > factory > URLFactory


1 /**
2  * JOnAS: Java(TM) Open Application Server
3  * Copyright (C) 1999 Bull S.A.
4  * Contact: jonas-team@objectweb.org
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19  * USA
20  *
21  * Initial developer(s): Guillaume SAUTHIER
22  * --------------------------------------------------------------------------
23  * $Id: URLFactory.java,v 1.4 2004/04/19 13:49:09 sauthieg Exp $
24  * --------------------------------------------------------------------------
25  */
26
27 package org.objectweb.petals.classloader.factory;
28
29 import java.net.URL JavaDoc;
30 import java.io.IOException JavaDoc;
31
32 /**
33  * An <code>URLFactory</code> is used to create a URL from a base URL.
34  *
35  * @author Guillaume Sauthier
36  */
37 public abstract class URLFactory {
38
39     /**
40      * Returns a new URL basically adding path to the base URL.
41      *
42      * @param path the path to add to the URL.
43      *
44      * @return a new URL.
45      *
46      * @throws IOException when created URL is invalid.
47      */
48     public abstract URL JavaDoc getURL(String JavaDoc path) throws IOException JavaDoc;
49
50     /**
51      * Return a new URLFactory in function of the URL type.
52      * an URL pointing to a jar file will return a <code>JarURLFactory</code>
53      * and an URL pointing to a directory file will return a <code>DirURLFactory</code>.
54      *
55      * @param url the base URL
56      *
57      * @return a new URLFactory in function of the URL type.
58      *
59      * @throws IOException when cannot find a specialized factory for the given URL.
60      */
61     public static URLFactory getFactory(URL JavaDoc url) throws IOException JavaDoc {
62
63         String JavaDoc path = url.getPath();
64         if (path.matches(".*\\..ar")) {
65             // jar detected if path ends with .?ar (*.jar, *.war, *.ear)
66 return new JarURLFactory(url);
67         } else if (path.endsWith("/")) {
68             // directory detected if url ends with a separator /
69 return new DirURLFactory(url);
70         } else {
71             String JavaDoc err = "Unsupported URL '" + url + "' support "
72                 + "only jar archive and directory";
73             throw new IOException JavaDoc(err);
74         }
75     }
76
77 }
78
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