/**
* 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");
}
