1 /*
2  * Copyright (C) 2018 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 package libcore.util;
17 
18 /**
19  * @hide
20  */
21 @libcore.api.CorePlatformApi
22 public final class ArrayUtils {
ArrayUtils()23     private ArrayUtils() {}
24 
25     /**
26      * Throws {@link ArrayIndexOutOfBoundsException} if the range is out of bounds.
27      * @param len length of the array. Must be non-negative
28      * @param offset start index of the range. Must be non-negative
29      * @param count length of the range. Must be non-negative
30      * @throws ArrayIndexOutOfBoundsException if the range from {@code offset} with length
31      * {@code count} is out of bounds of the array
32      */
33     @libcore.api.CorePlatformApi
throwsIfOutOfBounds(int len, int offset, int count)34     public static void throwsIfOutOfBounds(int len, int offset, int count) {
35         if (len < 0) {
36             throw new ArrayIndexOutOfBoundsException("Negative length: " + len);
37         }
38 
39         if ((offset | count) < 0 || offset > len - count) {
40             throw new ArrayIndexOutOfBoundsException(
41                 "length=" + len + "; regionStart=" + offset + "; regionLength=" + count);
42         }
43     }
44 }
45