Annotation Interface ConditionalPostconditionAnnotation

@Documented @Retention(RUNTIME) @Target(ANNOTATION_TYPE) public @interface ConditionalPostconditionAnnotation
A meta-annotation that indicates that an annotation E is a conditional postcondition annotation, i.e., E is a type-specialized version of EnsuresQualifierIf or EnsuresQualifierIf.List.

The established postcondition P has type specified by the qualifier field of this annotation. If the annotation E has elements annotated by QualifierArgument, their values are copied to the arguments (elements) of annotation P with the same names. Different element names may be used in E and P, if a QualifierArgument in E gives the name of the corresponding element in P.

For example, the following code declares a postcondition annotation for the MinLen qualifier:

 @ConditionalPostconditionAnnotation(qualifier = MinLen.class)
 @Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
 public @interface EnsuresMinLen {
   String[] expression();
   boolean result();
   int targetValue() default 0;
The expression element holds the expressions to which the qualifier applies and targetValue holds the value for the value argument of MinLen.

The following code then uses the annotation on a method that ensures field to be @MinLen(4) upon returning true.

 @EnsuresMinLenIf(expression = "field", result = true, targetValue = 4")
 public boolean isFieldBool() {
   return field == "true" || field == "false";
See Also:
  • Required Element Summary

    Required Elements
    Modifier and Type
    Required Element
    Class<? extends Annotation>
    The qualifier that will be established as a postcondition.