Home | History | Annotate | Download | only in le 
      1 /*
      2  * Copyright (C) 2014 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 package android.bluetooth.le;
     18 
     19 import android.bluetooth.BluetoothAdapter;
     20 import android.util.SparseArray;
     21 
     22 import java.util.Arrays;
     23 import java.util.Iterator;
     24 import java.util.Map;
     25 import java.util.Objects;
     26 import java.util.Set;
     27 
     28 /**
     29  * Helper class for Bluetooth LE utils.
     30  *
     31  * @hide
     32  */
     33 public class BluetoothLeUtils {
     34 
     35     /**
     36      * Returns a string composed from a {@link SparseArray}.
     37      */
     38     static String toString(SparseArray<byte[]> array) {
     39         if (array == null) {
     40             return "null";
     41         }
     42         if (array.size() == 0) {
     43             return "{}";
     44         }
     45         StringBuilder buffer = new StringBuilder();
     46         buffer.append('{');
     47         for (int i = 0; i < array.size(); ++i) {
     48             buffer.append(array.keyAt(i)).append("=").append(Arrays.toString(array.valueAt(i)));
     49         }
     50         buffer.append('}');
     51         return buffer.toString();
     52     }
     53 
     54     /**
     55      * Returns a string composed from a {@link Map}.
     56      */
     57     static <T> String toString(Map<T, byte[]> map) {
     58         if (map == null) {
     59             return "null";
     60         }
     61         if (map.isEmpty()) {
     62             return "{}";
     63         }
     64         StringBuilder buffer = new StringBuilder();
     65         buffer.append('{');
     66         Iterator<Map.Entry<T, byte[]>> it = map.entrySet().iterator();
     67         while (it.hasNext()) {
     68             Map.Entry<T, byte[]> entry = it.next();
     69             Object key = entry.getKey();
     70             buffer.append(key).append("=").append(Arrays.toString(map.get(key)));
     71             if (it.hasNext()) {
     72                 buffer.append(", ");
     73             }
     74         }
     75         buffer.append('}');
     76         return buffer.toString();
     77     }
     78 
     79     /**
     80      * Check whether two {@link SparseArray} equal.
     81      */
     82     static boolean equals(SparseArray<byte[]> array, SparseArray<byte[]> otherArray) {
     83         if (array == otherArray) {
     84             return true;
     85         }
     86         if (array == null || otherArray == null) {
     87             return false;
     88         }
     89         if (array.size() != otherArray.size()) {
     90             return false;
     91         }
     92 
     93         // Keys are guaranteed in ascending order when indices are in ascending order.
     94         for (int i = 0; i < array.size(); ++i) {
     95             if (array.keyAt(i) != otherArray.keyAt(i)
     96                     || !Arrays.equals(array.valueAt(i), otherArray.valueAt(i))) {
     97                 return false;
     98             }
     99         }
    100         return true;
    101     }
    102 
    103     /**
    104      * Check whether two {@link Map} equal.
    105      */
    106     static <T> boolean equals(Map<T, byte[]> map, Map<T, byte[]> otherMap) {
    107         if (map == otherMap) {
    108             return true;
    109         }
    110         if (map == null || otherMap == null) {
    111             return false;
    112         }
    113         if (map.size() != otherMap.size()) {
    114             return false;
    115         }
    116         Set<T> keys = map.keySet();
    117         if (!keys.equals(otherMap.keySet())) {
    118             return false;
    119         }
    120         for (T key : keys) {
    121             if (!Objects.deepEquals(map.get(key), otherMap.get(key))) {
    122                 return false;
    123             }
    124         }
    125         return true;
    126     }
    127 
    128     /**
    129      * Ensure Bluetooth is turned on.
    130      *
    131      * @throws IllegalStateException If {@code adapter} is null or Bluetooth state is not {@link
    132      * BluetoothAdapter#STATE_ON}.
    133      */
    134     static void checkAdapterStateOn(BluetoothAdapter adapter) {
    135         if (adapter == null || !adapter.isLeEnabled()) {
    136             throw new IllegalStateException("BT Adapter is not turned ON");
    137         }
    138     }
    139 
    140 }
    141