/**
* Automatically retrieve ID from entity instance.
*
* @param obj The object from whom we need primary key
* @return The corresponding primary key.
*/
@SuppressWarnings({"rawtypes", "unchecked"})
protected ID getIdFromEntity(T obj) {
MetamodelUtils utils =
new MetamodelUtils<T, ID>(
(Class<T>) ClassUtils.getGenericTypeFromBean(this.service), em.getMetamodel());
return (ID) utils.getIdFromEntity(obj);
}
/*
* (non-Javadoc)
*
* @see org.resthub.web.controller.GenericController#update(ID, T)
*/
@SuppressWarnings({"rawtypes", "unchecked"})
@Override
@PUT
@Path("/{id}")
public T update(@PathParam("id") ID id, T entity) {
Assert.notNull(id, "id cannot be null");
T retreivedEntity = this.service.findById(id);
if (retreivedEntity == null) {
throw new NotFoundException();
}
MetamodelUtils utils =
new MetamodelUtils<T, ID>(
(Class<T>) ClassUtils.getGenericTypeFromBean(this.service), em.getMetamodel());
Serializable entityId = utils.getIdFromEntity(entity);
if ((entityId != null) && !id.equals(this.getIdFromEntity(retreivedEntity))) {
throw new WebApplicationException(Response.Status.CONFLICT);
}
if (null == entityId) {
utils.setIdForEntity(entity, id);
}
return this.service.update(entity);
}