0N/A/*
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
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2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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0N/A */
0N/A
0N/Apackage com.sun.jndi.url.dns;
0N/A
0N/A
0N/Aimport java.util.Hashtable;
0N/A
0N/Aimport javax.naming.*;
0N/Aimport javax.naming.spi.ObjectFactory;
0N/A
0N/A
0N/A/**
0N/A * A DNS URL context factory creates contexts that can resolve names
0N/A * that are DNS pseudo-URLs.
0N/A * In addition, if given a specific DNS URL (or an array of them), the
0N/A * factory will resolve all the way to the named context.
0N/A * See com.sun.jndi.dns.DnsUrl for a description of the URL format.
0N/A *
0N/A * @author Scott Seligman
0N/A */
0N/A
0N/A
0N/Apublic class dnsURLContextFactory implements ObjectFactory {
0N/A
0N/A public Object getObjectInstance(Object urlInfo, Name name,
0N/A Context nameCtx, Hashtable<?,?> env)
0N/A throws NamingException {
0N/A
0N/A if (urlInfo == null) {
0N/A return (new dnsURLContext(env));
0N/A } else if (urlInfo instanceof String) {
0N/A return getUsingURL((String) urlInfo, env);
0N/A } else if (urlInfo instanceof String[]) {
0N/A return getUsingURLs((String[]) urlInfo, env);
0N/A } else {
0N/A throw (new ConfigurationException(
0N/A "dnsURLContextFactory.getObjectInstance: " +
0N/A "argument must be a DNS URL String or an array of them"));
0N/A }
0N/A }
0N/A
0N/A private static Object getUsingURL(String url, Hashtable env)
0N/A throws NamingException {
0N/A
0N/A dnsURLContext urlCtx = new dnsURLContext(env);
0N/A try {
0N/A return urlCtx.lookup(url);
0N/A } finally {
0N/A urlCtx.close();
0N/A }
0N/A }
0N/A
0N/A /*
0N/A * Try each URL until lookup() succeeds for one of them.
0N/A * If all URLs fail, throw one of the exceptions arbitrarily.
0N/A * Not pretty, but potentially more informative than returning null.
0N/A */
0N/A private static Object getUsingURLs(String[] urls, Hashtable env)
0N/A throws NamingException {
0N/A
0N/A if (urls.length == 0) {
0N/A throw (new ConfigurationException(
0N/A "dnsURLContextFactory: empty URL array"));
0N/A }
0N/A dnsURLContext urlCtx = new dnsURLContext(env);
0N/A try {
0N/A NamingException ne = null;
0N/A for (int i = 0; i < urls.length; i++) {
0N/A try {
0N/A return urlCtx.lookup(urls[i]);
0N/A } catch (NamingException e) {
0N/A ne = e;
0N/A }
0N/A }
0N/A throw ne; // failure: throw one of the exceptions caught
0N/A } finally {
0N/A urlCtx.close();
0N/A }
0N/A }
0N/A}