/** * Returns a map key for a given to-many map relationship and a target object. * * @since 3.0 */ protected Object getMapKey(String relationshipName, Object value) { EntityResolver resolver = objectContext.getEntityResolver(); ClassDescriptor descriptor = resolver.getClassDescriptor(objectId.getEntityName()); if (descriptor == null) { throw new IllegalStateException("DataObject's entity is unmapped, objectId: " + objectId); } PropertyDescriptor property = descriptor.getProperty(relationshipName); if (property instanceof ToManyMapProperty) { return ((ToManyMapProperty) property).getMapKey(value); } throw new IllegalArgumentException( "Relationship '" + relationshipName + "' is not a to-many Map"); }