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
17package android.util;
18
19class ContainerHelpers {
20    static final boolean[] EMPTY_BOOLEANS = new boolean[0];
21    static final int[] EMPTY_INTS = new int[0];
22    static final long[] EMPTY_LONGS = new long[0];
23    static final Object[] EMPTY_OBJECTS = new Object[0];
24
25    // This is Arrays.binarySearch(), but doesn't do any argument validation.
26    static int binarySearch(int[] array, int size, int value) {
27        int lo = 0;
28        int hi = size - 1;
29
30        while (lo <= hi) {
31            final int mid = (lo + hi) >>> 1;
32            final int midVal = array[mid];
33
34            if (midVal < value) {
35                lo = mid + 1;
36            } else if (midVal > value) {
37                hi = mid - 1;
38            } else {
39                return mid;  // value found
40            }
41        }
42        return ~lo;  // value not present
43    }
44
45    static int binarySearch(long[] array, int size, long value) {
46        int lo = 0;
47        int hi = size - 1;
48
49        while (lo <= hi) {
50            final int mid = (lo + hi) >>> 1;
51            final long midVal = array[mid];
52
53            if (midVal < value) {
54                lo = mid + 1;
55            } else if (midVal > value) {
56                hi = mid - 1;
57            } else {
58                return mid;  // value found
59            }
60        }
61        return ~lo;  // value not present
62    }
63}
64