/* * Copyright (c) 2002, 2010, 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 sun.net.dns; import java.util.List; /** * The configuration of the client resolver. * *
A ResolverConfiguration is a singleton that represents the
* configuration of the client resolver. The ResolverConfiguration
* is opened by invoking the {@link #open() open} method.
*
* @since 1.4
*/
public abstract class ResolverConfiguration {
private static final Object lock = new Object();
private static ResolverConfiguration provider;
protected ResolverConfiguration() { }
/**
* Opens the resolver configuration.
*
* @return the resolver configuration
*/
public static ResolverConfiguration open() {
synchronized (lock) {
if (provider == null) {
provider = new sun.net.dns.ResolverConfigurationImpl();
}
return provider;
}
}
/**
* Returns a list corresponding to the domain search path. The
* list is ordered by the search order used for host name lookup.
* Each element in the list returns a {@link java.lang.String}
* containing a domain name or suffix.
*
* @return list of domain names
*/
public abstract List