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package com.signalfx.shaded.checkerframework.framework.qual;
import java.lang.annotation.Annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* 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 {@code @FieldInvariant} annotation does not currently accommodate type qualifiers with
* attributes, such as {@code @MinLen(1)}. In this case, the type system should implement its own
* field invariant annotation and override {@code
* AnnotatedTypeFactory.getFieldInvariantDeclarationAnnotations()} and {@code
* AnnotatedTypeFactory.getFieldInvariants()}. See {@link
* com.signalfx.shaded.checkerframework.common.value.qual.MinLenFieldInvariant} for an example.
*
* @checker_framework.manual #field-invariants Field invariants
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
@Inherited
public @interface FieldInvariant {
/**
* The qualifier on the field. Must be a subtype of the qualifier on the declaration of the field.
*/
Class[] qualifier();
/**
* The field that has a more precise type, in the class on which the {@code FieldInvariant}
* annotation is written. The field must be declared in a superclass and must be {@code final}.
*/
String[] field();
}