| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.client5.http; |
| |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| |
| /** |
| * Users may implement this interface to override the normal DNS lookup offered |
| * by the OS. |
| * |
| * @since 4.2 |
| */ |
| @Contract(threading = ThreadingBehavior.STATELESS) |
| public interface DnsResolver { |
| |
| /** |
| * Returns the IP address for the specified host name, or null if the given |
| * host is not recognized or the associated IP address cannot be used to |
| * build an InetAddress instance. |
| * |
| * @see InetAddress |
| * |
| * @param host |
| * The host name to be resolved by this resolver. |
| * @return The IP address associated to the given host name, or null if the |
| * host name is not known by the implementation class. |
| */ |
| InetAddress[] resolve(String host) throws UnknownHostException; |
| |
| /** |
| * Gets the fully qualified domain name for given host name. |
| * @since 5.0 |
| */ |
| String resolveCanonicalHostname(String host) throws UnknownHostException; |
| |
| } |