| /* |
| * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.jndi.url.dns; |
| |
| |
| import java.util.Hashtable; |
| |
| import javax.naming.*; |
| import javax.naming.spi.ObjectFactory; |
| |
| |
| /** |
| * A DNS URL context factory creates contexts that can resolve names |
| * that are DNS pseudo-URLs. |
| * In addition, if given a specific DNS URL (or an array of them), the |
| * factory will resolve all the way to the named context. |
| * See com.sun.jndi.dns.DnsUrl for a description of the URL format. |
| * |
| * @author Scott Seligman |
| */ |
| |
| |
| public class dnsURLContextFactory implements ObjectFactory { |
| |
| public Object getObjectInstance(Object urlInfo, Name name, |
| Context nameCtx, Hashtable<?,?> env) |
| throws NamingException { |
| |
| if (urlInfo == null) { |
| return (new dnsURLContext(env)); |
| } else if (urlInfo instanceof String) { |
| return getUsingURL((String) urlInfo, env); |
| } else if (urlInfo instanceof String[]) { |
| return getUsingURLs((String[]) urlInfo, env); |
| } else { |
| throw (new ConfigurationException( |
| "dnsURLContextFactory.getObjectInstance: " + |
| "argument must be a DNS URL String or an array of them")); |
| } |
| } |
| |
| private static Object getUsingURL(String url, Hashtable env) |
| throws NamingException { |
| |
| dnsURLContext urlCtx = new dnsURLContext(env); |
| try { |
| return urlCtx.lookup(url); |
| } finally { |
| urlCtx.close(); |
| } |
| } |
| |
| /* |
| * Try each URL until lookup() succeeds for one of them. |
| * If all URLs fail, throw one of the exceptions arbitrarily. |
| * Not pretty, but potentially more informative than returning null. |
| */ |
| private static Object getUsingURLs(String[] urls, Hashtable env) |
| throws NamingException { |
| |
| if (urls.length == 0) { |
| throw (new ConfigurationException( |
| "dnsURLContextFactory: empty URL array")); |
| } |
| dnsURLContext urlCtx = new dnsURLContext(env); |
| try { |
| NamingException ne = null; |
| for (int i = 0; i < urls.length; i++) { |
| try { |
| return urlCtx.lookup(urls[i]); |
| } catch (NamingException e) { |
| ne = e; |
| } |
| } |
| throw ne; // failure: throw one of the exceptions caught |
| } finally { |
| urlCtx.close(); |
| } |
| } |
| } |