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package javax.annotation;

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

import javax.annotation.meta.TypeQualifierDefault;

/**
 * This annotation can be applied to a package, class or method to indicate that
 * the method parameters in that element are nullable by default unless there is:
 * 
 * An explicit nullness annotation
 * 
The method overrides a method in a superclass (in which case the
 * annotation of the corresponding parameter in the superclass applies)
 * 
There is a default parameter annotation applied to a more tightly nested element.
 * 
 * This annotation implies the same "nullness" as no annotation. However, it is different
 * than having no annotation, as it is inherited and it can override a {@link ParametersAreNonnullByDefault}
 * annotation at an outer scope.
 *
 * @see Nullable
 */
@Documented
@Nullable
@TypeQualifierDefault(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface ParametersAreNullableByDefault {
}