public CustomField addCustomField(CustomField field) throws ApplicationException {
if (field == null
|| ConvertUtil.isNullOrEmpty(field.getEntityName())
|| ConvertUtil.isNullOrEmpty(field.getFieldName())
|| ConvertUtil.isNullOrEmpty(field.getSourceFieldName())) {
log.info("The custom field to be added is invalid: " + field);
throw new ApplicationException("Unable to add invalid custom field definition.");
}
// Validate that a custom field by the same name does not already exist.
List<CustomField> fields = loadCustomFields(field.getEntityName());
for (CustomField custom : fields) {
if (custom.getFieldName().equalsIgnoreCase(field.getFieldName())) {
log.warn(
"User attempted to add a custom field "
+ field
+ " that already exists in the system.");
throw new ApplicationException(
"Unable to add a custom field that already exists in the system.");
}
}
Entity entity = findLatestEntityVersionByName(field.getEntityName());
try {
EntityAttribute attribute = buildAttributeFromCustomField(entity, field);
entity.addAttribute(attribute);
// TODO: Validate that the source field is known
// TODO: Validate that the transformation function is known
attribute = entityDefinitionDao.addCustomField(entity, attribute);
// Generate a notification event to inform interested listeners via the lightweight mechanism
// that this event has occurred.
Context.notifyObserver(ObservationEventType.CUSTOM_FIELD_ADD_EVENT, field);
Context.notifyObserver(ObservationEventType.ENTITY_ATTRIBUTE_UPDATE_EVENT, entity);
return field;
} catch (DaoException e) {
log.error("Failed while saving a custom field: " + e, e);
throw new ApplicationException("Failed while saving the custom field: " + e.getMessage());
}
}
