| /* |
| * 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. |
| */ |
| |
| package org.apache.uima.adapter.vinci.util; |
| |
| import java.net.Inet4Address; |
| import java.net.InetAddress; |
| import java.net.NetworkInterface; |
| import java.net.SocketException; |
| import java.net.UnknownHostException; |
| import java.util.Enumeration; |
| |
| // TODO: Auto-generated Javadoc |
| /** |
| * Network utilities. |
| */ |
| public class NetworkUtil { |
| /** |
| * Gets the InetAddress of the localhost. Attempts to get a non-loopback address (i.e. not |
| * 127.0.0.1) if at all possible. This utility is better than InetAddress.getLocalHost() since the |
| * latter often fails on Linux. |
| * |
| * @return the InetAddress of the localhost. This will be a non-loopback address if one could be |
| * found. |
| * |
| * @throws UnknownHostException |
| * if the local host address could not be obtained |
| */ |
| public static InetAddress getLocalHostAddress() throws UnknownHostException { |
| // try the straightforward call first |
| InetAddress localhost = InetAddress.getLocalHost(); |
| if (!localhost.isLoopbackAddress()) { |
| return localhost; |
| } |
| |
| // the above often fails on Linux. Try enumerating all NetworkInterfaces. |
| try { |
| Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces(); |
| while (networkInterfaces.hasMoreElements()) { |
| NetworkInterface networkInterface = (NetworkInterface) networkInterfaces.nextElement(); |
| Enumeration addresses = networkInterface.getInetAddresses(); |
| while (addresses.hasMoreElements()) { |
| InetAddress address = (InetAddress) addresses.nextElement(); |
| if (address instanceof Inet4Address && !address.isLoopbackAddress()) { |
| return address; |
| } |
| } |
| } |
| } catch (SocketException e) { |
| // couldn't get network interfaces. Give up. |
| } |
| |
| // give up and just return the loopback address |
| return localhost; |
| } |
| } |