59 lines
1.8 KiB
Java
59 lines
1.8 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.util;
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import android.annotation.NonNull;
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import android.annotation.Nullable;
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import java.util.Objects;
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/** @hide */
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@android.ravenwood.annotation.RavenwoodKeepWholeClass
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public class ObjectUtils {
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private ObjectUtils() {}
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/**
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* Returns the first of two given parameters that is not {@code null}, if either is,
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* or otherwise throws a {@link NullPointerException}.
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*
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* @throws NullPointerException if both {@code a} and {@code b} were {@code null}
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*/
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@NonNull
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public static <T> T firstNotNull(@Nullable T a, @NonNull T b) {
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return a != null ? a : Objects.requireNonNull(b);
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}
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/**
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* Nullsafe {@link Comparable#compareTo}
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*/
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public static <T extends Comparable> int compare(@Nullable T a, @Nullable T b) {
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if (a != null) {
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return (b != null) ? a.compareTo(b) : 1;
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} else {
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return (b != null) ? -1 : 0;
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}
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}
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/**
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* Returns its first argument if non-null, and the second otherwise.
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*/
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@Nullable
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public static <T> T getOrElse(@Nullable final T object, @Nullable final T otherwise) {
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return null != object ? object : otherwise;
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}
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}
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