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
6 * under the terms of the GNU General Public License version 2 only, as
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.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.jndi.url.rmi;
27
28
29import java.util.Hashtable;
30
31import javax.naming.*;
32import 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
47public class rmiURLContextFactory implements ObjectFactory {
48
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
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     */
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