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/*
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* Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net;
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import java.util.Objects;
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/**
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* This class represents a Network Interface address. In short it's an
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* IP address, a subnet mask and a broadcast address when the address is
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* an IPv4 one. An IP address and a network prefix length in the case
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* of IPv6 address.
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*
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* @see java.net.NetworkInterface
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* @since 1.6
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*/
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public class InterfaceAddress {
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private InetAddress address = null;
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private Inet4Address broadcast = null;
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private short maskLength = 0;
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/*
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* Package private constructor. Can't be built directly, instances are
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* obtained through the NetworkInterface class.
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*/
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InterfaceAddress() {
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}
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/**
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* Returns an {@code InetAddress} for this address.
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*
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* @return the {@code InetAddress} for this address.
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*/
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public InetAddress getAddress() {
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return address;
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}
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/**
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* Returns an {@code InetAddress} for the broadcast address
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* for this InterfaceAddress.
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* <p>
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* Only IPv4 networks have broadcast address therefore, in the case
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* of an IPv6 network, {@code null} will be returned.
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*
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* @return the {@code InetAddress} representing the broadcast
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* address or {@code null} if there is no broadcast address.
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*/
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public InetAddress getBroadcast() {
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return broadcast;
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}
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/**
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* Returns the network prefix length for this address. This is also known
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* as the subnet mask in the context of IPv4 addresses.
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* Typical IPv4 values would be 8 (255.0.0.0), 16 (255.255.0.0)
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* or 24 (255.255.255.0). <p>
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* Typical IPv6 values would be 128 (::1/128) or 10 (fe80::203:baff:fe27:1243/10)
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*
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* @return a {@code short} representing the prefix length for the
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* subnet of that address.
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*/
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public short getNetworkPrefixLength() {
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return maskLength;
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}
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/**
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* Compares this object against the specified object.
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* The result is {@code true} if and only if the argument is
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* not {@code null} and it represents the same interface address as
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* this object.
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* <p>
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* Two instances of {@code InterfaceAddress} represent the same
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* address if the InetAddress, the prefix length and the broadcast are
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* the same for both.
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*
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* @param obj the object to compare against.
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* @return {@code true} if the objects are the same;
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* {@code false} otherwise.
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* @see java.net.InterfaceAddress#hashCode()
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*/
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public boolean equals(Object obj) {
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if (obj instanceof InterfaceAddress) {
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InterfaceAddress cmp = (InterfaceAddress) obj;
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if (Objects.equals(address, cmp.address) &&
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Objects.equals(broadcast, cmp.broadcast) &&
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maskLength == cmp.maskLength)
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{
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return true;
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}
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}
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return false;
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}
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/**
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* Returns a hashcode for this Interface address.
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*
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* @return a hash code value for this Interface address.
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*/
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public int hashCode() {
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return address.hashCode() + ((broadcast != null) ? broadcast.hashCode() : 0) + maskLength;
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}
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/**
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* Converts this Interface address to a {@code String}. The
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* string returned is of the form: InetAddress / prefix length [ broadcast address ].
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*
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* @return a string representation of this Interface address.
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*/
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public String toString() {
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return address + "/" + maskLength + " [" + broadcast + "]";
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}
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}
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