1/*
2 * Copyright (C) 2016 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 com.android.packageinstaller.permission.utils;
18
19import android.text.TextUtils;
20
21import java.util.Objects;
22
23public final class ArrayUtils {
24    private ArrayUtils() { /* cannot be instantiated */ }
25
26    /**
27     * Checks that value is present as at least one of the elements of the array.
28     * @param array the array to check in
29     * @param value the value to check for
30     * @return true if the value is present in the array
31     */
32    public static <T> boolean contains(T[] array, T value) {
33        return indexOf(array, value) != -1;
34    }
35
36    /**
37     * Return first index of {@code value} in {@code array}, or {@code -1} if
38     * not found.
39     */
40    public static <T> int indexOf(T[] array, T value) {
41        if (array == null) return -1;
42        for (int i = 0; i < array.length; i++) {
43            if (Objects.equals(array[i], value)) return i;
44        }
45        return -1;
46    }
47
48    public static String[] appendString(String[] cur, String val) {
49        if (cur == null) {
50            return new String[] { val };
51        }
52        final int N = cur.length;
53        for (int i = 0; i < N; i++) {
54            if (TextUtils.equals(cur[i], val)) {
55                return cur;
56            }
57        }
58        String[] ret = new String[N + 1];
59        System.arraycopy(cur, 0, ret, 0, N);
60        ret[N] = val;
61        return ret;
62    }
63}
64