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/*
* 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 {@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());
}
}
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