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/*
* Copyright (C) 2021 The Guava Authors
*
* 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.google.common.util.concurrent;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.annotation.meta.When.UNKNOWN;
import com.google.common.annotations.GwtCompatible;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.annotation.Nonnull;
import javax.annotation.meta.TypeQualifierNickname;
/**
* Marks a "top-level" type-variable usage as (a) a Kotlin platform type when the type argument is
* non-nullable and (b) nullable when the type argument is nullable. This is the closest we can get
* to "non-nullable when non-nullable; nullable when nullable" (like the Android {@code
* NullFromTypeParam}). We use this to "undo" {@link ElementTypesAreNonnullByDefault}.
*/
@GwtCompatible
@Retention(RUNTIME)
@Target({FIELD, METHOD, PARAMETER})
@TypeQualifierNickname
@Nonnull(when = UNKNOWN)
@interface ParametricNullness {}