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      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 
     36     public P2pDiscovery(BuiltInPrintService printService) {
     37         super(printService);
     38     }
     39 
     40     /** Convert a peer device to a debug representation */
     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 */
     51     public static Uri toPath(WifiP2pDevice device) {
     52         return Uri.parse(SCHEME_P2P + "://" + device.deviceAddress.replace(":", "-"));
     53     }
     54 
     55     @Override
     56     void onStart() {
     57         if (DEBUG) Log.d(TAG, "onStart()");
     58         startPeerDiscovery();
     59     }
     60 
     61     @Override
     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 
     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
     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
     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 */
    101     public void addValidPrinter(DiscoveredPrinter printer) {
    102         if (addSavedPrinter(printer)) {
    103             printerFound(printer);
    104             if (isStarted()) {
    105                 startPeerDiscovery();
    106             }
    107         }
    108     }
    109 }
    110