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Java > Open Source Codes > org > jboss > util > naming > ENCThreadLocalKey


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.util.naming;
23
24 import java.util.Hashtable JavaDoc;
25 import javax.naming.Context JavaDoc;
26 import javax.naming.Name JavaDoc;
27 import javax.naming.Reference JavaDoc;
28 import javax.naming.RefAddr JavaDoc;
29 import javax.naming.LinkRef JavaDoc;
30 import javax.naming.spi.ObjectFactory JavaDoc;
31
32 import org.jboss.logging.Logger;
33
34 /**
35  * Return a LinkRef based on a ThreadLocal key.
36  *
37  * @author <a HREF="mailto:bill@burkecentral.com">Bill Burke</a>
38  * @version $Revision: 1958 $
39  */
40 public class ENCThreadLocalKey
41       implements ObjectFactory JavaDoc
42 {
43    private static final Logger log = Logger.getLogger(ENCThreadLocalKey.class);
44
45    // We need all the weak maps to make sure everything is released properly
46 // and we don't have any memory leaks
47
48    private final static ThreadLocal JavaDoc key = new ThreadLocal JavaDoc();
49
50    public static void setKey(String JavaDoc tlkey)
51    {
52       key.set(tlkey);
53    }
54
55    public static String JavaDoc getKey()
56    {
57       return (String JavaDoc) key.get();
58    }
59
60    public Object JavaDoc getObjectInstance(Object JavaDoc obj,
61          Name JavaDoc name,
62          Context JavaDoc nameCtx,
63          Hashtable JavaDoc environment)
64          throws Exception JavaDoc
65    {
66       Reference JavaDoc ref = (Reference JavaDoc) obj;
67       String JavaDoc reftype = (String JavaDoc) key.get();
68       boolean trace = log.isTraceEnabled();
69
70       if (reftype == null)
71       {
72          if (trace)
73             log.trace("using default in ENC");
74          reftype = "default";
75       }
76
77       RefAddr JavaDoc addr = ref.get(reftype);
78       if (addr == null)
79       {
80          if (trace)
81             log.trace("using default in ENC");
82          addr = ref.get("default"); // try to get default linking
83 }
84       if (addr != null)
85       {
86          String JavaDoc target = (String JavaDoc) addr.getContent();
87          if (trace)
88             log.trace("found Reference " + reftype + " with content " + target);
89          return new LinkRef JavaDoc(target);
90       }
91       return null;
92    }
93
94 }
95
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