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package com.dslplatform.json;

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.TypeQualifierNickname;

/**
 * A common DslJson annotation to declare that annotated elements cannot be {@code null}.
 * 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 DslJson API.
 *
 * Should be used at parameter, return value, and field level. Method overrides should
 * repeat parent {@code @NonNull} annotations unless they behave differently.
 *
 * Use {@code @NonNullApi} (scope = parameters + return values) to set the default behavior
 * to non-nullable in order to avoid annotating your whole codebase with {@code @NonNull}.
 *
 * @see NonNullApi
 * @see Nullable
 */
@Target({ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Nonnull
@TypeQualifierNickname
public @interface NonNull {
}