Java tutorial
/* * ==================================================================== * 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.http.conn; import java.net.InetAddress; import java.net.UnknownHostException; /** * Users may implement this interface to override the normal DNS lookup offered * by the OS. * * @since 4.2 */ 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; }