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 17 package com.android.packageinstaller.permission.utils; 18 19 import android.text.TextUtils; 20 21 import java.util.Objects; 22 23 public final class ArrayUtils { 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 */ contains(T[] array, T value)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 */ indexOf(T[] array, T value)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 appendString(String[] cur, String val)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