1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.net; 18 19 import android.os.Parcel; 20 import android.os.Parcelable; 21 22 import java.net.Inet4Address; 23 import java.net.InetAddress; 24 import java.net.InterfaceAddress; 25 import java.net.UnknownHostException; 26 27 /** 28 * Identifies an address of a network link 29 * @hide 30 */ 31 public class LinkAddress implements Parcelable { 32 /** 33 * IPv4 or IPv6 address. 34 */ 35 private final InetAddress address; 36 37 /** 38 * Network prefix length 39 */ 40 private final int prefixLength; 41 LinkAddress(InetAddress address, int prefixLength)42 public LinkAddress(InetAddress address, int prefixLength) { 43 if (address == null || prefixLength < 0 || 44 ((address instanceof Inet4Address) && prefixLength > 32) || 45 (prefixLength > 128)) { 46 throw new IllegalArgumentException("Bad LinkAddress params " + address + 47 prefixLength); 48 } 49 this.address = address; 50 this.prefixLength = prefixLength; 51 } 52 LinkAddress(InterfaceAddress interfaceAddress)53 public LinkAddress(InterfaceAddress interfaceAddress) { 54 this.address = interfaceAddress.getAddress(); 55 this.prefixLength = interfaceAddress.getNetworkPrefixLength(); 56 } 57 58 @Override toString()59 public String toString() { 60 return (address == null ? "" : (address.getHostAddress() + "/" + prefixLength)); 61 } 62 63 /** 64 * Compares this {@code LinkAddress} instance against the specified address 65 * in {@code obj}. Two addresses are equal if their InetAddress and prefixLength 66 * are equal 67 * 68 * @param obj the object to be tested for equality. 69 * @return {@code true} if both objects are equal, {@code false} otherwise. 70 */ 71 @Override equals(Object obj)72 public boolean equals(Object obj) { 73 if (!(obj instanceof LinkAddress)) { 74 return false; 75 } 76 LinkAddress linkAddress = (LinkAddress) obj; 77 return this.address.equals(linkAddress.address) && 78 this.prefixLength == linkAddress.prefixLength; 79 } 80 81 @Override 82 /* 83 * generate hashcode based on significant fields 84 */ hashCode()85 public int hashCode() { 86 return ((null == address) ? 0 : address.hashCode()) + prefixLength; 87 } 88 89 /** 90 * Returns the InetAddress for this address. 91 */ getAddress()92 public InetAddress getAddress() { 93 return address; 94 } 95 96 /** 97 * Get network prefix length 98 */ getNetworkPrefixLength()99 public int getNetworkPrefixLength() { 100 return prefixLength; 101 } 102 103 /** 104 * Implement the Parcelable interface 105 * @hide 106 */ describeContents()107 public int describeContents() { 108 return 0; 109 } 110 111 /** 112 * Implement the Parcelable interface. 113 * @hide 114 */ writeToParcel(Parcel dest, int flags)115 public void writeToParcel(Parcel dest, int flags) { 116 if (address != null) { 117 dest.writeByte((byte)1); 118 dest.writeByteArray(address.getAddress()); 119 dest.writeInt(prefixLength); 120 } else { 121 dest.writeByte((byte)0); 122 } 123 } 124 125 /** 126 * Implement the Parcelable interface. 127 * @hide 128 */ 129 public static final Creator<LinkAddress> CREATOR = 130 new Creator<LinkAddress>() { 131 public LinkAddress createFromParcel(Parcel in) { 132 InetAddress address = null; 133 int prefixLength = 0; 134 if (in.readByte() == 1) { 135 try { 136 address = InetAddress.getByAddress(in.createByteArray()); 137 prefixLength = in.readInt(); 138 } catch (UnknownHostException e) { } 139 } 140 return new LinkAddress(address, prefixLength); 141 } 142 143 public LinkAddress[] newArray(int size) { 144 return new LinkAddress[size]; 145 } 146 }; 147 } 148