Home | History | Annotate | Download | only in companion 
      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 
     18 package android.companion;
     19 
     20 import static android.text.TextUtils.firstNotEmpty;
     21 
     22 import android.annotation.NonNull;
     23 import android.annotation.Nullable;
     24 import android.bluetooth.BluetoothDevice;
     25 import android.bluetooth.le.ScanFilter;
     26 import android.net.wifi.ScanResult;
     27 import android.os.ParcelUuid;
     28 import android.os.Parcelable;
     29 import android.util.Log;
     30 
     31 import java.util.Arrays;
     32 import java.util.List;
     33 import java.util.regex.Pattern;
     34 
     35 /** @hide */
     36 public 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