Java tutorial
/* * Copyright 2012 The Netty Project * * The Netty Project 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 io.netty.channel.socket; import io.netty.util.NetUtil; import java.net.Inet4Address; import java.net.Inet6Address; import java.net.InetAddress; /** * Internet Protocol (IP) families used byte the {@link DatagramChannel} */ public enum InternetProtocolFamily { IPv4(Inet4Address.class, 1, NetUtil.LOCALHOST4), IPv6(Inet6Address.class, 2, NetUtil.LOCALHOST6); private final Class<? extends InetAddress> addressType; private final int addressNumber; private final InetAddress localHost; InternetProtocolFamily(Class<? extends InetAddress> addressType, int addressNumber, InetAddress localHost) { this.addressType = addressType; this.addressNumber = addressNumber; this.localHost = localHost; } /** * Returns the address type of this protocol family. */ public Class<? extends InetAddress> addressType() { return addressType; } /** * Returns the * <a href="http://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml">address number</a> * of the family. */ public int addressNumber() { return addressNumber; } /** * Returns the {@link InetAddress} that represent the {@code LOCALHOST} for the family. */ public InetAddress localhost() { return localHost; } /** * Returns the {@link InternetProtocolFamily} for the given {@link InetAddress}. */ public static InternetProtocolFamily of(InetAddress address) { if (address instanceof Inet4Address) { return IPv4; } if (address instanceof Inet6Address) { return IPv6; } throw new IllegalArgumentException("address " + address + " not supported"); } }