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/*
 * Copyright 2002-2017 the original author or authors.
 * Copyright 2017-2021 VMware, Inc.
 *
 * 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
 *
 * https://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 io.micrometer.common.lang;

import javax.annotation.Nonnull;
import javax.annotation.meta.TypeQualifierNickname;
import javax.annotation.meta.When;
import java.lang.annotation.*;

/**
 * A common annotation to declare that annotated elements can be {@code null} under some
 * circumstance. Leverages JSR 305 meta-annotations to indicate nullability in Java to
 * common tools with JSR 305 support and used by Kotlin to infer nullability of the API.
 * 
 * Should be used at parameter, return value, and field level. Methods override should
 * repeat parent {@code @Nullable} annotations unless they behave differently.
 * 

 * Can be used in association with {@code NonNullApi} or {@code @NonNullFields} to
 * override the default non-nullable semantic to nullable.
 * 
 * NOTE: This file has been copied from {@code org.springframework.lang}.
 *
 * @author Sebastien Deleuze
 * @author Juergen Hoeller
 * @see NonNullApi
 * @see NonNullFields
 * @see NonNull
 */
@Target({ ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Nonnull(when = When.MAYBE)
@TypeQualifierNickname
public @interface Nullable {

}