1 /*
   2  * Copyright (c) 1999, 2004, 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 
  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 
  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 }