| /** |
| * 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.camel.util; |
| |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| |
| /** |
| * Util class for {@link java.net.InetAddress} |
| */ |
| public final class InetAddressUtil { |
| |
| private InetAddressUtil() { |
| // util class |
| } |
| |
| /** |
| * When using the {@link java.net.InetAddress#getHostName()} method in an |
| * environment where neither a proper DNS lookup nor an <tt>/etc/hosts</tt> |
| * entry exists for a given host, the following exception will be thrown: |
| * <p/> |
| * <code> |
| * java.net.UnknownHostException: <hostname>: <hostname> |
| * at java.net.InetAddress.getLocalHost(InetAddress.java:1425) |
| * ... |
| * </code> |
| * <p/> |
| * Instead of just throwing an UnknownHostException and giving up, this |
| * method grabs a suitable hostname from the exception and prevents the |
| * exception from being thrown. If a suitable hostname cannot be acquired |
| * from the exception, only then is the <tt>UnknownHostException</tt> thrown. |
| * |
| * @return the hostname |
| * @throws UnknownHostException is thrown if hostname could not be resolved |
| */ |
| public static String getLocalHostName() throws UnknownHostException { |
| try { |
| return (InetAddress.getLocalHost()).getHostName(); |
| } catch (UnknownHostException uhe) { |
| String host = uhe.getMessage(); // host = "hostname: hostname" |
| if (host != null) { |
| int colon = host.indexOf(':'); |
| if (colon > 0) { |
| return host.substring(0, colon); |
| } |
| } |
| throw uhe; |
| } |
| } |
| |
| } |