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    package javax.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import javax.annotation.meta.TypeQualifier;
import javax.annotation.meta.TypeQualifierValidator;
import javax.annotation.meta.When;

@Documented
@Retention(RetentionPolicy.RUNTIME)
@TypeQualifier
public @interface Nonnull {
    When when() default When.ALWAYS;

    public static class Checker implements TypeQualifierValidator<Nonnull> {
        public When forConstantValue(Nonnull nonnull, Object obj) {
            if (obj == null) {
                return When.NEVER;
            }
            return When.ALWAYS;
        }
    }
}
    
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