1 /*
2  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22  * or visit www.oracle.com if you need additional information or have any
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24  */
25 
26 package com.sun.jndi.url.rmi;
27 
28 
29 import java.util.Hashtable;
30 
31 import javax.naming.*;
32 import javax.naming.spi.ObjectFactory;
33 
34 
35 /**
36  * An RMI URL context factory creates contexts that can resolve names
37  * that are RMI URLs as defined by rmiURLContext.
38  * In addition, if given a specific RMI URL (or an array of them), the
39  * factory will resolve all the way to the named registry or object.
40  *
41  * @author Scott Seligman
42  *
43  * @see rmiURLContext
44  */
45 
46 
47 public class rmiURLContextFactory implements ObjectFactory {
48 
getObjectInstance(Object urlInfo, Name name, Context nameCtx, Hashtable<?,?> env)49     public Object getObjectInstance(Object urlInfo, Name name,
50                                     Context nameCtx, Hashtable<?,?> env)
51             throws NamingException
52     {
53         if (urlInfo == null) {
54             return (new rmiURLContext(env));
55         } else if (urlInfo instanceof String) {
56             return getUsingURL((String)urlInfo, env);
57         } else if (urlInfo instanceof String[]) {
58             return getUsingURLs((String[])urlInfo, env);
59         } else {
60             throw (new ConfigurationException(
61                     "rmiURLContextFactory.getObjectInstance: " +
62                     "argument must be an RMI URL String or an array of them"));
63         }
64     }
65 
getUsingURL(String url, Hashtable<?,?> env)66     private static Object getUsingURL(String url, Hashtable<?,?> env)
67             throws NamingException
68     {
69         rmiURLContext urlCtx = new rmiURLContext(env);
70         try {
71             return urlCtx.lookup(url);
72         } finally {
73             urlCtx.close();
74         }
75     }
76 
77     /*
78      * Try each URL until lookup() succeeds for one of them.
79      * If all URLs fail, throw one of the exceptions arbitrarily.
80      * Not pretty, but potentially more informative than returning null.
81      */
getUsingURLs(String[] urls, Hashtable<?,?> env)82     private static Object getUsingURLs(String[] urls, Hashtable<?,?> env)
83             throws NamingException
84     {
85         if (urls.length == 0) {
86             throw (new ConfigurationException(
87                     "rmiURLContextFactory: empty URL array"));
88         }
89         rmiURLContext urlCtx = new rmiURLContext(env);
90         try {
91             NamingException ne = null;
92             for (int i = 0; i < urls.length; i++) {
93                 try {
94                     return urlCtx.lookup(urls[i]);
95                 } catch (NamingException e) {
96                     ne = e;
97                 }
98             }
99             throw ne;
100         } finally {
101             urlCtx.close();
102         }
103     }
104 }
105