1 /* 2 * Copyright (C) 2011 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 com.android.server.net; 18 19 import android.net.NetworkIdentity; 20 21 import java.io.DataInputStream; 22 import java.io.DataOutputStream; 23 import java.io.IOException; 24 import java.util.HashSet; 25 26 import static android.net.ConnectivityManager.TYPE_MOBILE; 27 28 /** 29 * Identity of a {@code iface}, defined by the set of {@link NetworkIdentity} 30 * active on that interface. 31 * 32 * @hide 33 */ 34 public class NetworkIdentitySet extends HashSet<NetworkIdentity> implements 35 Comparable<NetworkIdentitySet> { 36 private static final int VERSION_INIT = 1; 37 private static final int VERSION_ADD_ROAMING = 2; 38 private static final int VERSION_ADD_NETWORK_ID = 3; 39 private static final int VERSION_ADD_METERED = 4; 40 NetworkIdentitySet()41 public NetworkIdentitySet() { 42 } 43 NetworkIdentitySet(DataInputStream in)44 public NetworkIdentitySet(DataInputStream in) throws IOException { 45 final int version = in.readInt(); 46 final int size = in.readInt(); 47 for (int i = 0; i < size; i++) { 48 if (version <= VERSION_INIT) { 49 final int ignored = in.readInt(); 50 } 51 final int type = in.readInt(); 52 final int subType = in.readInt(); 53 final String subscriberId = readOptionalString(in); 54 final String networkId; 55 if (version >= VERSION_ADD_NETWORK_ID) { 56 networkId = readOptionalString(in); 57 } else { 58 networkId = null; 59 } 60 final boolean roaming; 61 if (version >= VERSION_ADD_ROAMING) { 62 roaming = in.readBoolean(); 63 } else { 64 roaming = false; 65 } 66 67 final boolean metered; 68 if (version >= VERSION_ADD_METERED) { 69 metered = in.readBoolean(); 70 } else { 71 // If this is the old data and the type is mobile, treat it as metered. (Note that 72 // if this is a mobile network, TYPE_MOBILE is the only possible type that could be 73 // used.) 74 metered = (type == TYPE_MOBILE); 75 } 76 77 add(new NetworkIdentity(type, subType, subscriberId, networkId, roaming, metered)); 78 } 79 } 80 writeToStream(DataOutputStream out)81 public void writeToStream(DataOutputStream out) throws IOException { 82 out.writeInt(VERSION_ADD_METERED); 83 out.writeInt(size()); 84 for (NetworkIdentity ident : this) { 85 out.writeInt(ident.getType()); 86 out.writeInt(ident.getSubType()); 87 writeOptionalString(out, ident.getSubscriberId()); 88 writeOptionalString(out, ident.getNetworkId()); 89 out.writeBoolean(ident.getRoaming()); 90 out.writeBoolean(ident.getMetered()); 91 } 92 } 93 94 /** @return whether any {@link NetworkIdentity} in this set is considered roaming. */ isAnyMemberRoaming()95 public boolean isAnyMemberRoaming() { 96 if (isEmpty()) { 97 return false; 98 } 99 for (NetworkIdentity ident : this) { 100 if (ident.getRoaming()) { 101 return true; 102 } 103 } 104 return false; 105 } 106 writeOptionalString(DataOutputStream out, String value)107 private static void writeOptionalString(DataOutputStream out, String value) throws IOException { 108 if (value != null) { 109 out.writeByte(1); 110 out.writeUTF(value); 111 } else { 112 out.writeByte(0); 113 } 114 } 115 readOptionalString(DataInputStream in)116 private static String readOptionalString(DataInputStream in) throws IOException { 117 if (in.readByte() != 0) { 118 return in.readUTF(); 119 } else { 120 return null; 121 } 122 } 123 124 @Override compareTo(NetworkIdentitySet another)125 public int compareTo(NetworkIdentitySet another) { 126 if (isEmpty()) return -1; 127 if (another.isEmpty()) return 1; 128 129 final NetworkIdentity ident = iterator().next(); 130 final NetworkIdentity anotherIdent = another.iterator().next(); 131 return ident.compareTo(anotherIdent); 132 } 133 } 134