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/*
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* Copyright 1999-2004 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.jndi.url.rmi;
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import java.util.Hashtable;
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import javax.naming.*;
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import javax.naming.spi.ObjectFactory;
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/**
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* An RMI URL context factory creates contexts that can resolve names
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* that are RMI URLs as defined by rmiURLContext.
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* In addition, if given a specific RMI URL (or an array of them), the
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* factory will resolve all the way to the named registry or object.
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*
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* @author Scott Seligman
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*
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* @see rmiURLContext
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*/
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public class rmiURLContextFactory implements ObjectFactory {
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public Object getObjectInstance(Object urlInfo, Name name,
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Context nameCtx, Hashtable<?,?> env)
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throws NamingException
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{
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if (urlInfo == null) {
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return (new rmiURLContext(env));
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} else if (urlInfo instanceof String) {
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return getUsingURL((String)urlInfo, env);
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} else if (urlInfo instanceof String[]) {
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return getUsingURLs((String[])urlInfo, env);
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} else {
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throw (new ConfigurationException(
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"rmiURLContextFactory.getObjectInstance: " +
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"argument must be an RMI URL String or an array of them"));
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}
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}
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private static Object getUsingURL(String url, Hashtable env)
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throws NamingException
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{
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rmiURLContext urlCtx = new rmiURLContext(env);
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try {
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return urlCtx.lookup(url);
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} finally {
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urlCtx.close();
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}
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}
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/*
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* Try each URL until lookup() succeeds for one of them.
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* If all URLs fail, throw one of the exceptions arbitrarily.
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* Not pretty, but potentially more informative than returning null.
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*/
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private static Object getUsingURLs(String[] urls, Hashtable env)
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throws NamingException
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{
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if (urls.length == 0) {
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throw (new ConfigurationException(
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"rmiURLContextFactory: empty URL array"));
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}
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rmiURLContext urlCtx = new rmiURLContext(env);
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try {
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NamingException ne = null;
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for (int i = 0; i < urls.length; i++) {
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try {
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return urlCtx.lookup(urls[i]);
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} catch (NamingException e) {
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ne = e;
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}
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}
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throw ne;
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} finally {
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urlCtx.close();
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}
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}
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}
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