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/*
 * 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.commons.text.lookup;

import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * Looks up keys related to the local host: host name, canonical host name, host address.
 * 

* The lookup keys are: *

*
    *
  • name: for the local host name, for example {@code EXAMPLE}.
  • *
  • canonical-name: for the local canonical host name, for example {@code EXAMPLE.apache.org}.
  • *
  • address: for the local host address, for example {@code 192.168.56.1}.
  • *
* * @since 1.3 */ final class LocalHostStringLookup extends AbstractStringLookup { /** * Defines the singleton for this class. */ static final LocalHostStringLookup INSTANCE = new LocalHostStringLookup(); /** * No need to build instances for now. */ private LocalHostStringLookup() { // empty } /** * Looks up the value of the Java platform key. * * @param key * the key to be looked up, may be null * @return The value of the environment variable. */ @Override public String lookup(final String key) { switch (key) { case "name": try { return InetAddress.getLocalHost().getHostName(); } catch (final UnknownHostException e) { return null; } case "canonical-name": try { return InetAddress.getLocalHost().getCanonicalHostName(); } catch (final UnknownHostException e) { return null; } case "address": try { return InetAddress.getLocalHost().getHostAddress(); } catch (final UnknownHostException e) { return null; } default: throw new IllegalArgumentException(key); } } }




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