| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package androidx.tvprovider.media.tv; |
| |
| import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP_PREFIX; |
| |
| import androidx.annotation.RestrictTo; |
| |
| import java.util.Arrays; |
| |
| /** |
| * Static utilities for collections |
| * @hide |
| */ |
| @RestrictTo(LIBRARY_GROUP_PREFIX) |
| public class CollectionUtils { |
| /** |
| * Returns an array with the arrays concatenated together. |
| * |
| * @see <a href="http://stackoverflow.com/a/784842/1122089">Stackoverflow answer</a> by |
| * <a href="http://stackoverflow.com/users/40342/joachim-sauer">Joachim Sauer</a> |
| */ |
| @SuppressWarnings("unchecked") |
| public static <T> T[] concatAll(T[] first, T[]... rest) { |
| int totalLength = first.length; |
| for (T[] array : rest) { |
| totalLength += array.length; |
| } |
| T[] result = Arrays.copyOf(first, totalLength); |
| int offset = first.length; |
| for (T[] array : rest) { |
| System.arraycopy(array, 0, result, offset, array.length); |
| offset += array.length; |
| } |
| return result; |
| } |
| |
| private CollectionUtils() { |
| } |
| } |