Bug in method getCompleteness of ModelUtilities

[Ludovic99]

Method addCanvas of class Range fails with message:

Exception in thread "main" java.lang.IllegalArgumentException: Member resource must only have an identifier and no other field. Use add<Resource>(URI first, URI... rest) for convenience.
	at de.digitalcollections.iiif.model.sharedcanvas.Range.checkIdOnly(Range.java:98)
	at de.digitalcollections.iiif.model.sharedcanvas.Range.addCanvas(Range.java:113)

It can be reproduced with:

import de.digitalcollections.iiif.model.sharedcanvas.Range;
class Test {
  public static void main(String[] args) {
    Range range = new Range("http://test/foo");
    range.addCanvas("http://test/baz");
  }
}

The cause is in method getCompleteness of ModelUtilities: the method getClass of Object is not filtered.
It could be replaced by:

  public static Completeness getCompleteness(Object res, Class<?> type) {
    Set<Method> getters =
        ReflectionUtils.getAllMethods(
            type, ReflectionUtils.withModifier(Modifier.PUBLIC), ReflectionUtils.withPrefix("get"));
    Set<String> gettersWithValues =
        getters.stream()
            .filter(g -> !g.getName().equals("getClass"))
            .filter(g -> g.getAnnotation(JsonIgnore.class) == null) // Only JSON-serializable fields
            .filter(g -> returnsValue(g, res))
            .map(Method::getName)
            .collect(Collectors.toSet());

    if (gettersWithValues.isEmpty()) {
      return Completeness.EMPTY;
    } else if (containsOnly(gettersWithValues, "getType", "getIdentifier")) {
      return Completeness.ID_AND_TYPE;
    } else if (containsOnly(gettersWithValues, "getType", "getIdentifier", "getLabels")) {
      return Completeness.ID_AND_TYPE_AND_LABEL;
    } else if (containsOnly(gettersWithValues, "getIdentifier")) {
      return Completeness.ID_ONLY;
    } else {
      return Completeness.COMPLEX;
    }
  }