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/*
 * Copyright 2002-2019 the original author or 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
 *
 *      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 org.springframework.lang;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.annotation.Nonnull;
import javax.annotation.meta.TypeQualifierDefault;

/**
 * A common Spring annotation to declare that fields are to be considered as
 * non-nullable by default for a given package.
 *
 * 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 Spring API.
 *
 * Should be used at package level in association with {@link Nullable}
 * annotations at field level.
 *
 * @author Sebastien Deleuze
 * @since 5.0
 * @see NonNullApi
 * @see Nullable
 * @see NonNull
 */
@Target(ElementType.PACKAGE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Nonnull
@TypeQualifierDefault(ElementType.FIELD)
public @interface NonNullFields {
}