1 /* 2 * Copyright (C) 2017 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.bips.discovery; 18 19 import android.net.Uri; 20 import android.net.wifi.p2p.WifiP2pDevice; 21 import android.util.Log; 22 23 import com.android.bips.BuiltInPrintService; 24 import com.android.bips.p2p.P2pPeerListener; 25 26 /** 27 * Discover previously-added P2P devices, if any. 28 */ 29 public class P2pDiscovery extends SavedDiscovery implements P2pPeerListener { 30 public static final String SCHEME_P2P = "p2p"; 31 private static final String TAG = P2pDiscovery.class.getSimpleName(); 32 private static final boolean DEBUG = false; 33 34 private boolean mDiscoveringPeers = false; 35 P2pDiscovery(BuiltInPrintService printService)36 public P2pDiscovery(BuiltInPrintService printService) { 37 super(printService); 38 } 39 40 /** Convert a peer device to a debug representation */ toPrinter(WifiP2pDevice device)41 public static DiscoveredPrinter toPrinter(WifiP2pDevice device) { 42 Uri path = toPath(device); 43 String deviceName = device.deviceName; 44 if (deviceName.trim().isEmpty()) { 45 deviceName = device.deviceAddress; 46 } 47 return new DiscoveredPrinter(path, deviceName, path, null); 48 } 49 50 /** Convert a peer device address to a Uri-based path */ toPath(WifiP2pDevice device)51 public static Uri toPath(WifiP2pDevice device) { 52 return Uri.parse(SCHEME_P2P + "://" + device.deviceAddress.replace(":", "-")); 53 } 54 55 @Override onStart()56 void onStart() { 57 if (DEBUG) Log.d(TAG, "onStart()"); 58 startPeerDiscovery(); 59 } 60 61 @Override onStop()62 void onStop() { 63 if (DEBUG) Log.d(TAG, "onStop()"); 64 if (mDiscoveringPeers) { 65 mDiscoveringPeers = false; 66 getPrintService().getP2pMonitor().stopDiscover(this); 67 allPrintersLost(); 68 } 69 } 70 startPeerDiscovery()71 private void startPeerDiscovery() { 72 // Ignore if already started or no known P2P printers exist 73 if (mDiscoveringPeers || getSavedPrinters().isEmpty()) { 74 return; 75 } 76 mDiscoveringPeers = true; 77 getPrintService().getP2pMonitor().discover(this); 78 } 79 80 @Override onPeerFound(WifiP2pDevice peer)81 public void onPeerFound(WifiP2pDevice peer) { 82 DiscoveredPrinter printer = toPrinter(peer); 83 if (DEBUG) Log.d(TAG, "onPeerFound " + printer); 84 85 // Only find saved printers 86 for (DiscoveredPrinter saved : getSavedPrinters()) { 87 if (saved.path.equals(printer.path)) { 88 printerFound(saved); 89 } 90 } 91 } 92 93 @Override onPeerLost(WifiP2pDevice peer)94 public void onPeerLost(WifiP2pDevice peer) { 95 DiscoveredPrinter printer = toPrinter(peer); 96 if (DEBUG) Log.d(TAG, "onPeerLost " + printer); 97 printerLost(printer.getUri()); 98 } 99 100 /** Adds a known, P2P-discovered, valid printer */ addValidPrinter(DiscoveredPrinter printer)101 public void addValidPrinter(DiscoveredPrinter printer) { 102 if (addSavedPrinter(printer)) { 103 printerFound(printer); 104 if (isStarted()) { 105 startPeerDiscovery(); 106 } 107 } 108 } 109 } 110