1 /* 2 * Copyright (C) 2015 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.tv.common; 18 19 import java.util.Arrays; 20 21 /** 22 * Static utilities for collections 23 */ 24 public class CollectionUtils { 25 26 /** 27 * Returns an array with the arrays concatenated together. 28 * 29 * @see <a href="http://stackoverflow.com/a/784842/1122089">Stackoverflow answer</a> by 30 * <a href="http://stackoverflow.com/users/40342/joachim-sauer">Joachim Sauer</a> 31 */ concatAll(T[] first, T[]... rest)32 public static <T> T[] concatAll(T[] first, T[]... rest) { 33 int totalLength = first.length; 34 for (T[] array : rest) { 35 totalLength += array.length; 36 } 37 T[] result = Arrays.copyOf(first, totalLength); 38 int offset = first.length; 39 for (T[] array : rest) { 40 System.arraycopy(array, 0, result, offset, array.length); 41 offset += array.length; 42 } 43 return result; 44 } 45 } 46