Irfan Sheriff | ed5d7d1 | 2010-10-01 16:08:28 -0700 | [diff] [blame^] | 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.InetAddress; |
| 23 | import java.net.InterfaceAddress; |
| 24 | import java.net.UnknownHostException; |
| 25 | |
| 26 | /** |
| 27 | * Identifies an address of a network link |
| 28 | * @hide |
| 29 | */ |
| 30 | public class LinkAddress implements Parcelable { |
| 31 | /** |
| 32 | * IPv4 or IPv6 address. |
| 33 | */ |
| 34 | private final InetAddress address; |
| 35 | |
| 36 | /** |
| 37 | * Network prefix |
| 38 | */ |
| 39 | private final int prefix; |
| 40 | |
| 41 | public LinkAddress(InetAddress address, InetAddress mask) { |
| 42 | this.address = address; |
| 43 | this.prefix = computeprefix(mask); |
| 44 | } |
| 45 | |
| 46 | public LinkAddress(InetAddress address, int prefix) { |
| 47 | this.address = address; |
| 48 | this.prefix = prefix; |
| 49 | } |
| 50 | |
| 51 | public LinkAddress(InterfaceAddress interfaceAddress) { |
| 52 | this.address = interfaceAddress.getAddress(); |
| 53 | this.prefix = interfaceAddress.getNetworkPrefixLength(); |
| 54 | } |
| 55 | |
| 56 | private static int computeprefix(InetAddress mask) { |
| 57 | int count = 0; |
| 58 | for (byte b : mask.getAddress()) { |
| 59 | for (int i = 0; i < 8; ++i) { |
| 60 | if ((b & (1 << i)) != 0) { |
| 61 | ++count; |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | return count; |
| 66 | } |
| 67 | |
| 68 | @Override |
| 69 | public String toString() { |
| 70 | return (address == null ? "" : (address.getHostAddress() + "/" + prefix)); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Compares this {@code LinkAddress} instance against the specified address |
| 75 | * in {@code obj}. Two addresses are equal if their InetAddress and prefix |
| 76 | * are equal |
| 77 | * |
| 78 | * @param obj the object to be tested for equality. |
| 79 | * @return {@code true} if both objects are equal, {@code false} otherwise. |
| 80 | */ |
| 81 | @Override |
| 82 | public boolean equals(Object obj) { |
| 83 | if (!(obj instanceof LinkAddress)) { |
| 84 | return false; |
| 85 | } |
| 86 | LinkAddress linkAddress = (LinkAddress) obj; |
| 87 | return this.address.equals(linkAddress.address) && |
| 88 | this.prefix == linkAddress.prefix; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Returns the InetAddress for this address. |
| 93 | */ |
| 94 | public InetAddress getAddress() { |
| 95 | return address; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Get network prefix length |
| 100 | */ |
| 101 | public int getNetworkPrefix() { |
| 102 | return prefix; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Implement the Parcelable interface |
| 107 | * @hide |
| 108 | */ |
| 109 | public int describeContents() { |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Implement the Parcelable interface. |
| 115 | * @hide |
| 116 | */ |
| 117 | public void writeToParcel(Parcel dest, int flags) { |
| 118 | if (address != null) { |
| 119 | dest.writeByte((byte)1); |
| 120 | dest.writeByteArray(address.getAddress()); |
| 121 | dest.writeInt(prefix); |
| 122 | } else { |
| 123 | dest.writeByte((byte)0); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Implement the Parcelable interface. |
| 129 | * @hide |
| 130 | */ |
| 131 | public static final Creator<LinkAddress> CREATOR = |
| 132 | new Creator<LinkAddress>() { |
| 133 | public LinkAddress createFromParcel(Parcel in) { |
| 134 | InetAddress address = null; |
| 135 | int prefix = 0; |
| 136 | if (in.readByte() == 1) { |
| 137 | try { |
| 138 | address = InetAddress.getByAddress(in.createByteArray()); |
| 139 | prefix = in.readInt(); |
| 140 | } catch (UnknownHostException e) { } |
| 141 | } |
| 142 | return new LinkAddress(address, prefix); |
| 143 | } |
| 144 | |
| 145 | public LinkAddress[] newArray(int size) { |
| 146 | return new LinkAddress[size]; |
| 147 | } |
| 148 | }; |
| 149 | } |