1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * Copyright (C) 2016 Mopria Alliance, Inc. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package com.android.bips.discovery; 19 20 import android.net.Uri; 21 import android.util.Log; 22 23 import java.util.ArrayList; 24 import java.util.Arrays; 25 import java.util.Collection; 26 import java.util.List; 27 28 /** Combines the behavior of multiple child {@link Discovery} objects to a single one */ 29 public class MultiDiscovery extends Discovery { 30 private static final String TAG = MultiDiscovery.class.getSimpleName(); 31 private static final boolean DEBUG = false; 32 33 private final List<Discovery> mDiscoveries = new ArrayList<>(); 34 private final List<Discovery> mStartedDiscoveries = new ArrayList<>(); 35 private final Listener mChildListener; 36 37 /** 38 * Construct an aggregate discovery mechanism, with preferred discovery mechanisms first 39 */ MultiDiscovery(Discovery first, Discovery... rest)40 public MultiDiscovery(Discovery first, Discovery... rest) { 41 super(first.getPrintService()); 42 mDiscoveries.add(first); 43 mDiscoveries.addAll(Arrays.asList(rest)); 44 mChildListener = new Listener() { 45 @Override 46 public void onPrinterFound(DiscoveredPrinter printer) { 47 printerFound(first(printer.getUri())); 48 } 49 50 @Override 51 public void onPrinterLost(DiscoveredPrinter printer) { 52 // Merge remaining printer records, if any 53 DiscoveredPrinter first = first(printer.getUri()); 54 if (first == null) { 55 printerLost(printer.getUri()); 56 } else { 57 printerFound(first); 58 } 59 } 60 }; 61 } 62 63 /** For a given URI return the first matching record, based on discovery mechanism order */ first(Uri printerUri)64 private DiscoveredPrinter first(Uri printerUri) { 65 for (Discovery discovery : getChildren()) { 66 DiscoveredPrinter found = discovery.getPrinter(printerUri); 67 if (found != null) { 68 return found; 69 } 70 } 71 return null; 72 } 73 74 @Override onStart()75 void onStart() { 76 if (DEBUG) Log.d(TAG, "onStart()"); 77 for (Discovery discovery : mDiscoveries) { 78 discovery.start(mChildListener); 79 mStartedDiscoveries.add(discovery); 80 } 81 } 82 stopAndClearAll()83 private void stopAndClearAll() { 84 for (Discovery discovery : mStartedDiscoveries) { 85 discovery.stop(mChildListener); 86 } 87 mStartedDiscoveries.clear(); 88 allPrintersLost(); 89 } 90 91 @Override onStop()92 void onStop() { 93 if (DEBUG) Log.d(TAG, "onStop()"); 94 stopAndClearAll(); 95 } 96 97 @Override getChildren()98 Collection<Discovery> getChildren() { 99 List<Discovery> children = new ArrayList<>(); 100 for (Discovery child : mDiscoveries) { 101 children.addAll(child.getChildren()); 102 } 103 return children; 104 } 105 } 106