| /* |
| * 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 com.android.internal.util; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import java.util.Objects; |
| |
| /** @hide */ |
| public class ObjectUtils { |
| private ObjectUtils() {} |
| |
| /** |
| * Returns the first of two given parameters that is not {@code null}, if either is, |
| * or otherwise throws a {@link NullPointerException}. |
| * |
| * @throws NullPointerException if both {@code a} and {@code b} were {@code null} |
| */ |
| @NonNull |
| public static <T> T firstNotNull(@Nullable T a, @NonNull T b) { |
| return a != null ? a : Objects.requireNonNull(b); |
| } |
| |
| /** |
| * Nullsafe {@link Comparable#compareTo} |
| */ |
| public static <T extends Comparable> int compare(@Nullable T a, @Nullable T b) { |
| if (a != null) { |
| return (b != null) ? a.compareTo(b) : 1; |
| } else { |
| return (b != null) ? -1 : 0; |
| } |
| } |
| |
| /** |
| * Returns its first argument if non-null, and the second otherwise. |
| */ |
| @Nullable |
| public static <T> T getOrElse(@Nullable final T object, @Nullable final T otherwise) { |
| return null != object ? object : otherwise; |
| } |
| } |