| /* |
| * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.net; |
| |
| /** |
| * This class represents a Network Interface address. In short it's an |
| * IP address, a subnet mask and a broadcast address when the address is |
| * an IPv4 one. An IP address and a network prefix length in the case |
| * of IPv6 address. |
| * |
| * @see java.net.NetworkInterface |
| * @since 1.6 |
| */ |
| public class InterfaceAddress { |
| private InetAddress address = null; |
| private Inet4Address broadcast = null; |
| private short maskLength = 0; |
| |
| /* |
| * Package private constructor. Can't be built directly, instances are |
| * obtained through the NetworkInterface class. |
| */ |
| InterfaceAddress() { |
| } |
| |
| InterfaceAddress(InetAddress address, Inet4Address broadcast, InetAddress netmask) { |
| this.address = address; |
| this.broadcast = broadcast; |
| this.maskLength = countPrefixLength(netmask); |
| } |
| |
| /** |
| * Counts the prefix length for the netmask address. |
| * |
| * A valid netmask address must start with a continuous sequence of 1, followed by a continuous |
| * sequence of 0. |
| */ |
| private short countPrefixLength(InetAddress netmask) { |
| short count = 0; |
| for (byte b : netmask.getAddress()) { |
| for (; b != 0; b <<= 1, ++count); |
| } |
| return count; |
| } |
| |
| /** |
| * Returns an {@code InetAddress} for this address. |
| * |
| * @return the {@code InetAddress} for this address. |
| */ |
| public InetAddress getAddress() { |
| return address; |
| } |
| |
| /** |
| * Returns an {@code InetAddress} for the broadcast address |
| * for this InterfaceAddress. |
| * <p> |
| * Only IPv4 networks have broadcast address therefore, in the case |
| * of an IPv6 network, {@code null} will be returned. |
| * |
| * @return the {@code InetAddress} representing the broadcast |
| * address or {@code null} if there is no broadcast address. |
| */ |
| public InetAddress getBroadcast() { |
| return broadcast; |
| } |
| |
| /** |
| * Returns the network prefix length for this address. This is also known |
| * as the subnet mask in the context of IPv4 addresses. |
| * Typical IPv4 values would be 8 (255.0.0.0), 16 (255.255.0.0) |
| * or 24 (255.255.255.0). <p> |
| * Typical IPv6 values would be 128 (::1/128) or 10 (fe80::203:baff:fe27:1243/10) |
| * |
| * @return a {@code short} representing the prefix length for the |
| * subnet of that address. |
| */ |
| public short getNetworkPrefixLength() { |
| return maskLength; |
| } |
| |
| /** |
| * Compares this object against the specified object. |
| * The result is {@code true} if and only if the argument is |
| * not {@code null} and it represents the same interface address as |
| * this object. |
| * <p> |
| * Two instances of {@code InterfaceAddress} represent the same |
| * address if the InetAddress, the prefix length and the broadcast are |
| * the same for both. |
| * |
| * @param obj the object to compare against. |
| * @return {@code true} if the objects are the same; |
| * {@code false} otherwise. |
| * @see java.net.InterfaceAddress#hashCode() |
| */ |
| public boolean equals(Object obj) { |
| if (!(obj instanceof InterfaceAddress)) { |
| return false; |
| } |
| InterfaceAddress cmp = (InterfaceAddress) obj; |
| if ( !(address == null ? cmp.address == null : address.equals(cmp.address)) ) |
| return false; |
| if ( !(broadcast == null ? cmp.broadcast == null : broadcast.equals(cmp.broadcast)) ) |
| return false; |
| if (maskLength != cmp.maskLength) |
| return false; |
| return true; |
| } |
| |
| /** |
| * Returns a hashcode for this Interface address. |
| * |
| * @return a hash code value for this Interface address. |
| */ |
| public int hashCode() { |
| return address.hashCode() + ((broadcast != null) ? broadcast.hashCode() : 0) + maskLength; |
| } |
| |
| /** |
| * Converts this Interface address to a {@code String}. The |
| * string returned is of the form: InetAddress / prefix length [ broadcast address ]. |
| * |
| * @return a string representation of this Interface address. |
| */ |
| public String toString() { |
| return address + "/" + maskLength + " [" + broadcast + "]"; |
| } |
| |
| } |