1 /* 2 * Copyright (C) 2017 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 androidx.tvprovider.media.tv; 17 18 import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP; 19 20 import androidx.annotation.RestrictTo; 21 22 import java.util.Arrays; 23 24 /** 25 * Static utilities for collections 26 * @hide 27 */ 28 @RestrictTo(LIBRARY_GROUP) 29 public class CollectionUtils { 30 /** 31 * Returns an array with the arrays concatenated together. 32 * 33 * @see <a href="http://stackoverflow.com/a/784842/1122089">Stackoverflow answer</a> by 34 * <a href="http://stackoverflow.com/users/40342/joachim-sauer">Joachim Sauer</a> 35 */ 36 public static <T> T[] concatAll(T[] first, T[]... rest) { 37 int totalLength = first.length; 38 for (T[] array : rest) { 39 totalLength += array.length; 40 } 41 T[] result = Arrays.copyOf(first, totalLength); 42 int offset = first.length; 43 for (T[] array : rest) { 44 System.arraycopy(array, 0, result, offset, array.length); 45 offset += array.length; 46 } 47 return result; 48 } 49 50 private CollectionUtils() { 51 } 52 } 53
