| /* |
| * Copyright (C) 2014 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.bluetooth.le; |
| |
| import android.bluetooth.BluetoothAdapter; |
| import android.util.SparseArray; |
| |
| import java.time.Duration; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.UUID; |
| |
| /** |
| * Helper class for Bluetooth LE utils. |
| * |
| * @hide |
| */ |
| public class BluetoothLeUtils { |
| |
| /** |
| * Timeout value for synchronous binder call |
| */ |
| private static final Duration SYNC_CALLS_TIMEOUT = Duration.ofSeconds(5); |
| |
| /** |
| * @return timeout value for synchronous binder call |
| */ |
| static Duration getSyncTimeout() { |
| return SYNC_CALLS_TIMEOUT; |
| } |
| |
| /** |
| * Returns a string composed from a byte array. |
| */ |
| static <T> String toString(byte[] data) { |
| if (data == null) { |
| return "null"; |
| } |
| if (data.length == 0) { |
| return "{}"; |
| } |
| StringBuilder buffer = new StringBuilder(); |
| buffer.append('{'); |
| for (int i = 0; i < data.length; i++) { |
| buffer.append(data[i]); |
| if ((i + 1) < data.length) { |
| buffer.append(", "); |
| } |
| } |
| buffer.append('}'); |
| return buffer.toString(); |
| } |
| |
| /** |
| * Returns a string composed from a {@link SparseArray}. |
| */ |
| static String toString(SparseArray<byte[]> array) { |
| if (array == null) { |
| return "null"; |
| } |
| if (array.size() == 0) { |
| return "{}"; |
| } |
| StringBuilder buffer = new StringBuilder(); |
| buffer.append('{'); |
| for (int i = 0; i < array.size(); ++i) { |
| buffer.append(array.keyAt(i)).append("=").append(Arrays.toString(array.valueAt(i))); |
| } |
| buffer.append('}'); |
| return buffer.toString(); |
| } |
| |
| /** |
| * Returns a string composed from a {@link Map}. |
| */ |
| static <T> String toString(Map<T, byte[]> map) { |
| if (map == null) { |
| return "null"; |
| } |
| if (map.isEmpty()) { |
| return "{}"; |
| } |
| StringBuilder buffer = new StringBuilder(); |
| buffer.append('{'); |
| Iterator<Map.Entry<T, byte[]>> it = map.entrySet().iterator(); |
| while (it.hasNext()) { |
| Map.Entry<T, byte[]> entry = it.next(); |
| Object key = entry.getKey(); |
| buffer.append(key).append("=").append(Arrays.toString(map.get(key))); |
| if (it.hasNext()) { |
| buffer.append(", "); |
| } |
| } |
| buffer.append('}'); |
| return buffer.toString(); |
| } |
| |
| /** |
| * Check whether two {@link SparseArray} equal. |
| */ |
| static boolean equals(SparseArray<byte[]> array, SparseArray<byte[]> otherArray) { |
| if (array == otherArray) { |
| return true; |
| } |
| if (array == null || otherArray == null) { |
| return false; |
| } |
| if (array.size() != otherArray.size()) { |
| return false; |
| } |
| |
| // Keys are guaranteed in ascending order when indices are in ascending order. |
| for (int i = 0; i < array.size(); ++i) { |
| if (array.keyAt(i) != otherArray.keyAt(i) |
| || !Arrays.equals(array.valueAt(i), otherArray.valueAt(i))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Check whether two {@link Map} equal. |
| */ |
| static <T> boolean equals(Map<T, byte[]> map, Map<T, byte[]> otherMap) { |
| if (map == otherMap) { |
| return true; |
| } |
| if (map == null || otherMap == null) { |
| return false; |
| } |
| if (map.size() != otherMap.size()) { |
| return false; |
| } |
| Set<T> keys = map.keySet(); |
| if (!keys.equals(otherMap.keySet())) { |
| return false; |
| } |
| for (T key : keys) { |
| if (!Objects.deepEquals(map.get(key), otherMap.get(key))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Ensure Bluetooth is turned on. |
| * |
| * @throws IllegalStateException If {@code adapter} is null or Bluetooth state is not {@link |
| * BluetoothAdapter#STATE_ON}. |
| */ |
| static void checkAdapterStateOn(BluetoothAdapter adapter) { |
| if (adapter == null || !adapter.isLeEnabled()) { |
| throw new IllegalStateException("BT Adapter is not turned ON"); |
| } |
| } |
| |
| /** |
| * Compares two UUIDs with a UUID mask. |
| * |
| * @param data first {@link #UUID} to compare. |
| * @param uuid second {@link #UUID} to compare. |
| * @param mask mask {@link #UUID}. |
| * @return true if both UUIDs are equals when masked, false otherwise. |
| */ |
| static boolean maskedEquals(UUID data, UUID uuid, UUID mask) { |
| if (mask == null) { |
| return Objects.equals(data, uuid); |
| } |
| return (data.getLeastSignificantBits() & mask.getLeastSignificantBits()) |
| == (uuid.getLeastSignificantBits() & mask.getLeastSignificantBits()) |
| && (data.getMostSignificantBits() & mask.getMostSignificantBits()) |
| == (uuid.getMostSignificantBits() & mask.getMostSignificantBits()); |
| } |
| } |