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| 1 | /* | ||
| 2 | * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.net; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * This class represents a Network Interface address. In short it's an | ||
| 30 | * IP address, a subnet mask and a broadcast address when the address is | ||
| 31 | * an IPv4 one. An IP address and a network prefix length in the case | ||
| 32 | * of IPv6 address. | ||
| 33 | * | ||
| 34 | * @see java.net.NetworkInterface | ||
| 35 | * @since 1.6 | ||
| 36 | */ | ||
| 37 | public class InterfaceAddress { | ||
| 38 | private InetAddress address = null; | ||
| 39 | private Inet4Address broadcast = null; | ||
| 40 | private short maskLength = 0; | ||
| 41 | |||
| 42 | /* | ||
| 43 | * Package private constructor. Can't be built directly, instances are | ||
| 44 | * obtained through the NetworkInterface class. | ||
| 45 | */ | ||
| 46 | InterfaceAddress() { | ||
| 47 | } | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Returns an <code>InetAddress</code> for this address. | ||
| 51 | * | ||
| 52 | * @return the <code>InetAddress</code> for this address. | ||
| 53 | */ | ||
| 54 | public InetAddress getAddress() { | ||
| 55 | return address; | ||
| 56 | } | ||
| 57 | |||
| 58 | /** | ||
| 59 | * Returns an <code>InetAddress</code> for the brodcast address | ||
| 60 | * for this InterfaceAddress. | ||
| 61 | * <p> | ||
| 62 | * Only IPv4 networks have broadcast address therefore, in the case | ||
| 63 | * of an IPv6 network, <code>null</code> will be returned. | ||
| 64 | * | ||
| 65 | * @return the <code>InetAddress</code> representing the broadcast | ||
| 66 | * address or <code>null</code> if there is no broadcast address. | ||
| 67 | */ | ||
| 68 | public InetAddress getBroadcast() { | ||
| 69 | return broadcast; | ||
| 70 | } | ||
| 71 | |||
| 72 | /** | ||
| 73 | * Returns the network prefix length for this address. This is also known | ||
| 74 | * as the subnet mask in the context of IPv4 addresses. | ||
| 75 | * Typical IPv4 values would be 8 (255.0.0.0), 16 (255.255.0.0) | ||
| 76 | * or 24 (255.255.255.0). <p> | ||
| 77 | * Typical IPv6 values would be 128 (::1/128) or 10 (fe80::203:baff:fe27:1243/10) | ||
| 78 | * | ||
| 79 | * @return a <code>short</code> representing the prefix length for the | ||
| 80 | * subnet of that address. | ||
| 81 | */ | ||
| 82 | public short getNetworkPrefixLength() { | ||
| 83 | return maskLength; | ||
| 84 | } | ||
| 85 | |||
| 86 | /** | ||
| 87 | * Compares this object against the specified object. | ||
| 88 | * The result is <code>true</code> if and only if the argument is | ||
| 89 | * not <code>null</code> and it represents the same interface address as | ||
| 90 | * this object. | ||
| 91 | * <p> | ||
| 92 | * Two instances of <code>InterfaceAddress</code> represent the same | ||
| 93 | * address if the InetAddress, the prefix length and the broadcast are | ||
| 94 | * the same for both. | ||
| 95 | * | ||
| 96 | * @param obj the object to compare against. | ||
| 97 | * @return <code>true</code> if the objects are the same; | ||
| 98 | * <code>false</code> otherwise. | ||
| 99 | * @see java.net.InterfaceAddress#hashCode() | ||
| 100 | */ | ||
| 101 | public boolean equals(Object obj) { | ||
| 102 | if (!(obj instanceof InterfaceAddress)) { | ||
| 103 | return false; | ||
| 104 | } | ||
| 105 | InterfaceAddress cmp = (InterfaceAddress) obj; | ||
| 106 | if ( !(address == null ? cmp.address == null : address.equals(cmp.address)) ) | ||
| 107 | return false; | ||
| 108 | if ( !(broadcast == null ? cmp.broadcast == null : broadcast.equals(cmp.broadcast)) ) | ||
| 109 | return false; | ||
| 110 | if (maskLength != cmp.maskLength) | ||
| 111 | return false; | ||
| 112 | return true; | ||
| 113 | } | ||
| 114 | |||
| 115 | /** | ||
| 116 | * Returns a hashcode for this Interface address. | ||
| 117 | * | ||
| 118 | * @return a hash code value for this Interface address. | ||
| 119 | */ | ||
| 120 | public int hashCode() { | ||
| 121 | return address.hashCode() + ((broadcast != null) ? broadcast.hashCode() : 0) + maskLength; | ||
| 122 | } | ||
| 123 | |||
| 124 | /** | ||
| 125 | * Converts this Interface address to a <code>String</code>. The | ||
| 126 | * string returned is of the form: InetAddress / prefix length [ broadcast address ]. | ||
| 127 | * | ||
| 128 | * @return a string representation of this Interface address. | ||
| 129 | */ | ||
| 130 | public String toString() { | ||
| 131 | return address + "/" + maskLength + " [" + broadcast + "]"; | ||
| 132 | } | ||
| 133 | |||
| 134 | } | ||