1 /*
2  * Copyright (C) 2013 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.util;
18 
19 class ContainerHelpers {
20 
21     // This is Arrays.binarySearch(), but doesn't do any argument validation.
binarySearch(int[] array, int size, int value)22     static int binarySearch(int[] array, int size, int value) {
23         int lo = 0;
24         int hi = size - 1;
25 
26         while (lo <= hi) {
27             final int mid = (lo + hi) >>> 1;
28             final int midVal = array[mid];
29 
30             if (midVal < value) {
31                 lo = mid + 1;
32             } else if (midVal > value) {
33                 hi = mid - 1;
34             } else {
35                 return mid;  // value found
36             }
37         }
38         return ~lo;  // value not present
39     }
40 
binarySearch(long[] array, int size, long value)41     static int binarySearch(long[] array, int size, long value) {
42         int lo = 0;
43         int hi = size - 1;
44 
45         while (lo <= hi) {
46             final int mid = (lo + hi) >>> 1;
47             final long midVal = array[mid];
48 
49             if (midVal < value) {
50                 lo = mid + 1;
51             } else if (midVal > value) {
52                 hi = mid - 1;
53             } else {
54                 return mid;  // value found
55             }
56         }
57         return ~lo;  // value not present
58     }
59 }
60