code: public ImmutableList<Constructor> getConstructors(Class classDefinition) {
          if (definedClasses.getRootValue().containsKey(classDefinition)) {
              return definedClasses.getRootValue().get(classDefinition);
          }
          return new ImmutableArrayList<>();
      }
docs: Return a list of defined constructors for a certain class. May be empty.
  
  @param classDefinition the class that constructors are requested for.
  
  @return a list of constructors for the given class