Hibernate version:3.1.3

Hi all

for my project at https://genericrcp.dev.java.net/ I need mapping information from the mapping files. Based on this info a generic gui will be generated. I parse the hbm.xml files manually to get this infos e.g. wich classes, simple attributes or kind of relationsships (otm, mtm ...)

Now I rec ognized that I can use the hibernate Configuration object to get the mapping info and don't have to parse the files by myself.

With this following code I've access to the mapping info especially on relations like ManyToOne and OneToMany.

Configuration cfg = new Configuration();

for (Iterator iter = cfg.getClassMappings(); iter.hasNext();) {
PersistentClass hPc = (PersistentClass) iter.next();
...

for (Iterator iterator = hPc.getPropertyIterator(); iterator.hasNext();) {
Property prop = (Property) iterator.next();


if (prop.getValue() instanceof ManyToOne) {
ManyToOne mto = (ManyToOne) prop.getValue();
}

if (prop.getValue() instanceof org.hibernate.mapping.Set) {
org.hibernate.mapping.Set set = (org.hibernate.mapping.Set) prop.getValue();
if(set.getElement() != null && set.getElement() instanceof OneToMany) {
OneToMany otm = (OneToMany) set.getElement();
}

}
}


My problem now is how do I know when a relation is Many-To-Many and wich Class of objects are in the Collection.

I don't found a class Many-To-Many and set.getElement() returns null when relation is MTM.

Thanks a lot.

Hibernate 3.2.6, Java 1.4.2

More of a bump than a response, as I have a very similar problem. I want to validate the configuration, with one of the criteria being that a collection which maps to a class with a filter attached must also have that filter attached. So I use the iterator from Configuration.getCollectionMappings() with the intention of subsequently looking up the mapping for the collected class, which I find by calling


However, in certain cases Collection.getElement() returns null, these being

a) using a custom UserType to persist a typesafe enum:


and b) having a many-to-many relationship with a persistent entity:


For my requirement, the first case is not an issue as the enum is not a persistent entity which could have a filter, but the second case is problematic. I can see that, in schema terms, here too the association is also not with a persistent entity but with the linking table foo_bars. However I would expect the mapping object to give me a way of getting back the class name given in the many-to-many element, although there doesn’t appear to be anything accessible in the Collection object from which this can be inferred.

Any thoughts appreciated, thanks.