web/play-java-forms/src/main/java/play/data/validation/Constraints.java
public static List<Tuple<String, List<Object>>> displayableConstraint(
      Set<ConstraintDescriptor<?>> constraints, Annotation[] orderedAnnotations) {
    final List<Annotation> constraintAnnot =
        constraints.stream().map(c -> c.getAnnotation()).collect(Collectors.<Annotation>toList());

    return Stream.of(orderedAnnotations)
        .filter(
            constraintAnnot
                ::contains) // only use annotations for which we actually have a constraint
        .filter(a -> a.annotationType().isAnnotationPresent(Display.class))
        .map(
            a ->
                displayableConstraint(
                    constraints
                        .parallelStream()
                        .filter(c -> c.getAnnotation().equals(a))
                        .findFirst()
                        .get()))
        .collect(Collectors.toList());
  }
public static List<Tuple<String, List<Object>>> displayableConstraint(
      Set<ConstraintDescriptor<?>> constraints, Annotation[] orderedAnnotations) {
    final List<Annotation> constraintAnnot =
        constraints.stream().map(c -> c.getAnnotation()).collect(Collectors.<Annotation>toList());

    return Stream.of(orderedAnnotations)
        .filter(
            constraintAnnot
                ::contains) // only use annotations for which we actually have a constraint
        .filter(a -> a.annotationType().isAnnotationPresent(Display.class))
        .map(
            a ->
                displayableConstraint(
                    constraints
                        .parallelStream()
                        .filter(c -> c.getAnnotation().equals(a))
                        .findFirst()
                        .get()))
        .collect(Collectors.toList());
  }
public static List < Tuple < String , List < Object > > > displayableConstraint ( Set < ConstraintDescriptor < ? > > constraints , Annotation [ ] orderedAnnotations ) { final List < Annotation > constraintAnnot = constraints . stream ( ) . map ( c -> c . getAnnotation ( ) ) . collect ( Collectors . < Annotation > toList ( ) ) ; return Stream . of ( orderedAnnotations ) . filter ( constraintAnnot :: contains ) // only use annotations for which we actually have a constraint . filter ( a -> a . annotationType ( ) . isAnnotationPresent ( Display . class ) ) . map ( a -> displayableConstraint ( constraints . parallelStream ( ) . filter ( c -> c . getAnnotation ( ) . equals ( a ) ) . findFirst ( ) . get ( ) ) ) . collect ( Collectors . toList ( ) ) ; }
Converts a set of constraints to human-readable values in guaranteed order. Only constraints
that have an annotation that intersect with the {@code orderedAnnotations} parameter will be
considered. The order of the returned constraints corresponds to the order of the {@code
orderedAnnotations parameter}.

@param constraints the set of constraint descriptors.
@param orderedAnnotations the array of annotations
@return a list of tuples showing readable constraints.
Converts a set of constraints to human - readable values in guaranteed order . Only constraints that have an annotation that intersect with the { @code orderedAnnotations } parameter will be considered . The order of the returned constraints corresponds to the order of the { @code orderedAnnotations parameter } .