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 18package android.companion; 19 20import static android.text.TextUtils.firstNotEmpty; 21 22import android.annotation.NonNull; 23import android.annotation.Nullable; 24import android.bluetooth.BluetoothDevice; 25import android.bluetooth.le.ScanFilter; 26import android.net.wifi.ScanResult; 27import android.os.ParcelUuid; 28import android.os.Parcelable; 29import android.util.Log; 30 31import java.util.Arrays; 32import java.util.List; 33import java.util.regex.Pattern; 34 35/** @hide */ 36public class BluetoothDeviceFilterUtils { 37 private BluetoothDeviceFilterUtils() {} 38 39 private static final boolean DEBUG = false; 40 private static final String LOG_TAG = "BluetoothDeviceFilterUtils"; 41 42 @Nullable 43 static String patternToString(@Nullable Pattern p) { 44 return p == null ? null : p.pattern(); 45 } 46 47 @Nullable 48 static Pattern patternFromString(@Nullable String s) { 49 return s == null ? null : Pattern.compile(s); 50 } 51 52 static boolean matches(ScanFilter filter, BluetoothDevice device) { 53 boolean result = matchesAddress(filter.getDeviceAddress(), device) 54 && matchesServiceUuid(filter.getServiceUuid(), filter.getServiceUuidMask(), device); 55 if (DEBUG) debugLogMatchResult(result, device, filter); 56 return result; 57 } 58 59 static boolean matchesAddress(String deviceAddress, BluetoothDevice device) { 60 final boolean result = deviceAddress == null 61 || (device != null && deviceAddress.equals(device.getAddress())); 62 if (DEBUG) debugLogMatchResult(result, device, deviceAddress); 63 return result; 64 } 65 66 static boolean matchesServiceUuids(List<ParcelUuid> serviceUuids, 67 List<ParcelUuid> serviceUuidMasks, BluetoothDevice device) { 68 for (int i = 0; i < serviceUuids.size(); i++) { 69 ParcelUuid uuid = serviceUuids.get(i); 70 ParcelUuid uuidMask = serviceUuidMasks.get(i); 71 if (!matchesServiceUuid(uuid, uuidMask, device)) { 72 return false; 73 } 74 } 75 return true; 76 } 77 78 static boolean matchesServiceUuid(ParcelUuid serviceUuid, ParcelUuid serviceUuidMask, 79 BluetoothDevice device) { 80 final boolean result = serviceUuid == null || 81 ScanFilter.matchesServiceUuids( 82 serviceUuid, 83 serviceUuidMask, 84 Arrays.asList(device.getUuids())); 85 if (DEBUG) debugLogMatchResult(result, device, serviceUuid); 86 return result; 87 } 88 89 static boolean matchesName(@Nullable Pattern namePattern, BluetoothDevice device) { 90 boolean result; 91 if (namePattern == null) { 92 result = true; 93 } else if (device == null) { 94 result = false; 95 } else { 96 final String name = device.getName(); 97 result = name != null && namePattern.matcher(name).find(); 98 } 99 if (DEBUG) debugLogMatchResult(result, device, namePattern); 100 return result; 101 } 102 103 static boolean matchesName(@Nullable Pattern namePattern, ScanResult device) { 104 boolean result; 105 if (namePattern == null) { 106 result = true; 107 } else if (device == null) { 108 result = false; 109 } else { 110 final String name = device.SSID; 111 result = name != null && namePattern.matcher(name).find(); 112 } 113 if (DEBUG) debugLogMatchResult(result, device, namePattern); 114 return result; 115 } 116 117 private static void debugLogMatchResult( 118 boolean result, BluetoothDevice device, Object criteria) { 119 Log.i(LOG_TAG, getDeviceDisplayNameInternal(device) + (result ? " ~ " : " !~ ") + criteria); 120 } 121 122 private static void debugLogMatchResult( 123 boolean result, ScanResult device, Object criteria) { 124 Log.i(LOG_TAG, getDeviceDisplayNameInternal(device) + (result ? " ~ " : " !~ ") + criteria); 125 } 126 127 public static String getDeviceDisplayNameInternal(@NonNull BluetoothDevice device) { 128 return firstNotEmpty(device.getAliasName(), device.getAddress()); 129 } 130 131 public static String getDeviceDisplayNameInternal(@NonNull ScanResult device) { 132 return firstNotEmpty(device.SSID, device.BSSID); 133 } 134 135 public static String getDeviceMacAddress(@NonNull Parcelable device) { 136 if (device instanceof BluetoothDevice) { 137 return ((BluetoothDevice) device).getAddress(); 138 } else if (device instanceof ScanResult) { 139 return ((ScanResult) device).BSSID; 140 } else if (device instanceof android.bluetooth.le.ScanResult) { 141 return getDeviceMacAddress(((android.bluetooth.le.ScanResult) device).getDevice()); 142 } else { 143 throw new IllegalArgumentException("Unknown device type: " + device); 144 } 145 } 146} 147