checkers.nullness.quals
Annotation Type KeyFor

@Documented
@Retention(value=RUNTIME)
@TypeQualifier
@SubtypeOf(value=Unqualified.class)
public @interface KeyFor

Indicates that the annotated reference of an Object that is a key in a map.

The value of the annotation should be the reference name of the map. The following declaration for example:

   Map<String, String> config = ...;
   @KeyFor("config") String key = "HOSTNAME";

   String hostname = config.get(key);     // known to be non-null
 

indicates that "HOSTNAME" is a key in config. The Nullness checker deduce this information to deduce that hostname reference is a nonnull reference.

Limitation: The Nullness checker trusts the user and doesn't validate the annotations. Future releases will check for the presence of the key in the map (when possible).

Required Element Summary

Modifier and Type	Required Element and Description
String[]	value Java expression(s) that evaluate to a map for which the annotated type is a key.

Element Detail

value

public abstract String[] value

Java expression(s) that evaluate to a map for which the annotated type is a key.

See Also:

Syntax of Java expressions