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/*
* 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;
}
}
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