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 17 18 package com.android.internal.util; 19 20 import android.annotation.NonNull; 21 import android.annotation.Nullable; 22 23 /** @hide */ 24 public class ObjectUtils { 25 private ObjectUtils() {} 26 27 @NonNull 28 public static <T> T firstNotNull(@Nullable T a, @NonNull T b) { 29 return a != null ? a : Preconditions.checkNotNull(b); 30 } 31 32 public static <T extends Comparable> int compare(@Nullable T a, @Nullable T b) { 33 if (a != null) { 34 return (b != null) ? a.compareTo(b) : 1; 35 } else { 36 return (b != null) ? -1 : 0; 37 } 38 } 39 } 40
