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/* * @(#)InterfaceAddress.java 1.3 06/01/12 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ 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() { } /** * Returns an <code>InetAddress</code> for this address. * * @return the <code>InetAddress</code> for this address. */ public InetAddress getAddress() { return address; } /** * Returns an <code>InetAddress</code> for the brodcast address * for this InterfaceAddress. * <p> * Only IPv4 networks have broadcast address therefore, in the case * of an IPv6 network, <code>null</code> will be returned. * * @return the <code>InetAddress</code> representing the broadcast * address or <code>null</code> 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</code> 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</code> if and only if the argument is * not <code>null</code> and it represents the same interface address as * this object. * <p> * Two instances of <code>InterfaceAddress</code> 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</code> if the objects are the same; * <code>false</code> 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</code>. 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 + "]"; } }