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.net.ProtocolException; 25 import java.util.HashSet; 26 27 /** 28 * Identity of a {@code iface}, defined by the set of {@link NetworkIdentity} 29 * active on that interface. 30 * 31 * @hide 32 */ 33 public class NetworkIdentitySet extends HashSet<NetworkIdentity> { 34 private static final int VERSION_INIT = 1; 35 private static final int VERSION_ADD_ROAMING = 2; 36 37 public NetworkIdentitySet() { 38 } 39 40 public NetworkIdentitySet(DataInputStream in) throws IOException { 41 final int version = in.readInt(); 42 switch (version) { 43 case VERSION_INIT: { 44 final int size = in.readInt(); 45 for (int i = 0; i < size; i++) { 46 final int ignoredVersion = in.readInt(); 47 final int type = in.readInt(); 48 final int subType = in.readInt(); 49 final String subscriberId = readOptionalString(in); 50 add(new NetworkIdentity(type, subType, subscriberId, false)); 51 } 52 break; 53 } 54 case VERSION_ADD_ROAMING: { 55 final int size = in.readInt(); 56 for (int i = 0; i < size; i++) { 57 final int type = in.readInt(); 58 final int subType = in.readInt(); 59 final String subscriberId = readOptionalString(in); 60 final boolean roaming = in.readBoolean(); 61 add(new NetworkIdentity(type, subType, subscriberId, roaming)); 62 } 63 break; 64 } 65 default: { 66 throw new ProtocolException("unexpected version: " + version); 67 } 68 } 69 } 70 71 public void writeToStream(DataOutputStream out) throws IOException { 72 out.writeInt(VERSION_ADD_ROAMING); 73 out.writeInt(size()); 74 for (NetworkIdentity ident : this) { 75 out.writeInt(ident.getType()); 76 out.writeInt(ident.getSubType()); 77 writeOptionalString(out, ident.getSubscriberId()); 78 out.writeBoolean(ident.getRoaming()); 79 } 80 } 81 82 private static void writeOptionalString(DataOutputStream out, String value) throws IOException { 83 if (value != null) { 84 out.writeByte(1); 85 out.writeUTF(value); 86 } else { 87 out.writeByte(0); 88 } 89 } 90 91 private static String readOptionalString(DataInputStream in) throws IOException { 92 if (in.readByte() != 0) { 93 return in.readUTF(); 94 } else { 95 return null; 96 } 97 } 98 } 99
