content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  
  package android.companion;
  
  import static android.text.TextUtils.firstNotEmpty;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.annotation.UnsupportedAppUsage;
  import android.bluetooth.BluetoothDevice;
  import android.bluetooth.le.ScanFilter;
  import android.net.wifi.ScanResult;
  import android.os.ParcelUuid;
  import android.os.Parcelable;
  import android.util.Log;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import java.util.regex.Pattern;
  
  /** @hide */
  public class BluetoothDeviceFilterUtils {
      private BluetoothDeviceFilterUtils() {}
  
      private static final boolean DEBUG = false;
      private static final String LOG_TAG = "BluetoothDeviceFilterUtils";
  
      @Nullable
      static String patternToString(@Nullable Pattern p) {
          return p == null ? null : p.pattern();
      }
  
      @Nullable
      static Pattern patternFromString(@Nullable String s) {
          return s == null ? null : Pattern.compile(s);
      }
  
      static boolean matches(ScanFilter filter, BluetoothDevice device) {
          boolean result = matchesAddress(filter.getDeviceAddress(), device)
                  && matchesServiceUuid(filter.getServiceUuid(), filter.getServiceUuidMask(), device);
          if (DEBUG) debugLogMatchResult(result, device, filter);
          return result;
      }
  
      static boolean matchesAddress(String deviceAddress, BluetoothDevice device) {
          final boolean result = deviceAddress == null
                  || (device != null && deviceAddress.equals(device.getAddress()));
          if (DEBUG) debugLogMatchResult(result, device, deviceAddress);
          return result;
      }
  
      static boolean matchesServiceUuids(List<ParcelUuid> serviceUuids,
              List<ParcelUuid> serviceUuidMasks, BluetoothDevice device) {
          for (int i = 0; i < serviceUuids.size(); i++) {
              ParcelUuid uuid = serviceUuids.get(i);
              ParcelUuid uuidMask = serviceUuidMasks.get(i);
              if (!matchesServiceUuid(uuid, uuidMask, device)) {
                  return false;
              }
          }
          return true;
      }
  
      static boolean matchesServiceUuid(ParcelUuid serviceUuid, ParcelUuid serviceUuidMask,
              BluetoothDevice device) {
          ParcelUuid[] uuids = device.getUuids();
          final boolean result = serviceUuid == null ||
                  ScanFilter.matchesServiceUuids(
                          serviceUuid,
                          serviceUuidMask,
                          uuids == null ? Collections.emptyList() : Arrays.asList(uuids));
          if (DEBUG) debugLogMatchResult(result, device, serviceUuid);
          return result;
      }
  
      static boolean matchesName(@Nullable Pattern namePattern, BluetoothDevice device) {
          boolean result;
          if (namePattern == null)  {
              result = true;
          } else if (device == null) {
              result = false;
          } else {
              final String name = device.getName();
              result = name != null && namePattern.matcher(name).find();
          }
          if (DEBUG) debugLogMatchResult(result, device, namePattern);
          return result;
      }
  
      static boolean matchesName(@Nullable Pattern namePattern, ScanResult device) {
          boolean result;
          if (namePattern == null)  {
              result = true;
          } else if (device == null) {
              result = false;
          } else {
              final String name = device.SSID;
              result = name != null && namePattern.matcher(name).find();
          }
          if (DEBUG) debugLogMatchResult(result, device, namePattern);
          return result;
      }
  
      private static void debugLogMatchResult(
              boolean result, BluetoothDevice device, Object criteria) {
          Log.i(LOG_TAG, getDeviceDisplayNameInternal(device) + (result ? " ~ " : " !~ ") + criteria);
      }
  
      private static void debugLogMatchResult(
              boolean result, ScanResult device, Object criteria) {
          Log.i(LOG_TAG, getDeviceDisplayNameInternal(device) + (result ? " ~ " : " !~ ") + criteria);
      }
  
      @UnsupportedAppUsage
      public static String getDeviceDisplayNameInternal(@NonNull BluetoothDevice device) {
          return firstNotEmpty(device.getAliasName(), device.getAddress());
      }
  
      @UnsupportedAppUsage
      public static String getDeviceDisplayNameInternal(@NonNull ScanResult device) {
          return firstNotEmpty(device.SSID, device.BSSID);
      }
  
      @UnsupportedAppUsage
      public static String getDeviceMacAddress(@NonNull Parcelable device) {
          if (device instanceof BluetoothDevice) {
              return ((BluetoothDevice) device).getAddress();
          } else if (device instanceof ScanResult) {
              return ((ScanResult) device).BSSID;
          } else if (device instanceof android.bluetooth.le.ScanResult) {
              return getDeviceMacAddress(((android.bluetooth.le.ScanResult) device).getDevice());
          } else {
              throw new IllegalArgumentException("Unknown device type: " + device);
          }
      }
  }
  