| package org.checkerframework.checker.optional.qual; |
| |
| 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 org.checkerframework.framework.qual.SubtypeOf; |
| |
| /** |
| * The bottom type qualifier for the Optional Checker. The only value of this type is {@code null}. |
| * Programmers rarely write this annotation. |
| * |
| * @checker_framework.manual #optional-checker Optional Checker |
| */ |
| @Documented |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER}) |
| @SubtypeOf({Present.class}) |
| public @interface OptionalBottom {} |