org.checkerframework.framework.qual

Annotation Type FieldInvariant

@Target(value=TYPE)
 @Inherited
 @Retention(value=RUNTIME)
public @interface FieldInvariant

Specifies that a field's type, in the class on which this annotation is written, is a subtype of its declared type. The field must be declared in a superclass and must be final.

The @FieldInvariant annotation does not currently accommodate type qualifiers with attributes, such as @MinLen(1). In this case, the type system should implement its own field invariant annotation and override AnnotatedTypeFactory.getFieldInvariantDeclarationAnnotations() and AnnotatedTypeFactory.getFieldInvariants(TypeElement). See MinLenFieldInvariant for example.

See the Checker Framework Manual:

Field invariants

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
String[]	field The field that has a more precise type, in the class on which the FieldInvariant annotation is written.
Class<? extends Annotation>[]	qualifier The qualifier on the field.

Element Detail

qualifier

public abstract Class<? extends Annotation>[] qualifier

The qualifier on the field. Must be a subtype of the qualifier on the declaration of the field.

field

public abstract String[] field

The field that has a more precise type, in the class on which the FieldInvariant annotation is written. The field must be declared in a superclass and must be final.