| package org.checkerframework.checker.nullness.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.DefaultFor; |
| import org.checkerframework.framework.qual.DefaultQualifierInHierarchy; |
| import org.checkerframework.framework.qual.InvisibleQualifier; |
| import org.checkerframework.framework.qual.LiteralKind; |
| import org.checkerframework.framework.qual.QualifierForLiterals; |
| import org.checkerframework.framework.qual.SubtypeOf; |
| import org.checkerframework.framework.qual.TypeUseLocation; |
| |
| /** |
| * Used internally by the type system; should never be written by a programmer. |
| * |
| * <p>Indicates that the value assigned to the annotated variable is not known to be a key for any |
| * map. It is the top type qualifier in the {@link KeyFor} hierarchy. It is also the default type |
| * qualifier. |
| * |
| * @checker_framework.manual #map-key-checker Map Key Checker |
| */ |
| @Documented |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER}) |
| @InvisibleQualifier |
| @SubtypeOf({}) |
| @DefaultQualifierInHierarchy |
| @DefaultFor(value = TypeUseLocation.LOWER_BOUND, types = Void.class) |
| @QualifierForLiterals(LiteralKind.NULL) |
| public @interface UnknownKeyFor {} |