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Java > Open Source Codes > org > jboss > net > protocol > resource > ResourceURLConnection


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.net.protocol.resource;
23
24 import java.io.IOException JavaDoc;
25 import java.io.FileNotFoundException JavaDoc;
26
27 import java.net.URL JavaDoc;
28 import java.net.MalformedURLException JavaDoc;
29
30 import org.jboss.net.protocol.DelegatingURLConnection;
31
32 import org.jboss.logging.Logger;
33
34 /**
35  * Provides access to system resources as a URLConnection.
36  *
37  * @version <tt>$Revision: 1958 $</tt>
38  * @author <a HREF="mailto:jason@planet57.com">Jason Dillon</a>
39  * @author Scott.Stark@jboss.org
40  */
41 public class ResourceURLConnection
42    extends DelegatingURLConnection
43 {
44    private static final Logger log = Logger.getLogger(ResourceURLConnection.class);
45
46    public ResourceURLConnection(final URL JavaDoc url)
47       throws MalformedURLException JavaDoc, IOException JavaDoc
48    {
49       super(url);
50    }
51
52    protected URL JavaDoc makeDelegateUrl(final URL JavaDoc url)
53       throws MalformedURLException JavaDoc, IOException JavaDoc
54    {
55       String JavaDoc name = url.getHost();
56       String JavaDoc file = url.getFile();
57       if (file != null && !file.equals(""))
58       {
59          name += file;
60       }
61
62       // first try TCL and then SCL
63
64       ClassLoader JavaDoc cl = Thread.currentThread().getContextClassLoader();
65       URL JavaDoc target = cl.getResource(name);
66
67       if (target == null)
68       {
69          cl = ClassLoader.getSystemClassLoader();
70          target = cl.getResource(name);
71       }
72
73       if (target == null)
74          throw new FileNotFoundException JavaDoc("Could not locate resource: " + name);
75
76       if (log.isTraceEnabled())
77       {
78          log.trace("Target resource URL: " + target);
79          try
80          {
81             log.trace("Target resource URL connection: " + target.openConnection());
82          }
83          catch (Exception JavaDoc ignore)
84          {
85          }
86       }
87
88       // Return a new URL as the cl version does not use the JB stream factory
89 return new URL JavaDoc(target.toExternalForm());
90    }
91 }
92
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