org.checkerframework.checker.nullness.qual

Annotation Type PolyKeyFor

@Documented
 @PolymorphicQualifier(value=UnknownKeyFor.class)
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
public @interface PolyKeyFor

A polymorphic qualifier for the Map Key (@KeyFor) type system.

Any method written using @PolyKeyFor conceptually has an arbitrary number of versions: one in which every instance of @PolyKeyFor has been replaced by @UnknownKeyFor, one in which every instance of @PolyKeyFor has been replaced by @KeyForBottom, and ones in which every instance of @PolyKeyFor has been replaced by @KeyFor, for every possible combination of map arguments.

See the Checker Framework Manual:

Nullness Checker, Qualifier polymorphism