/**
* Retrieves the identifying number of the relation definition that is 'allowed' between two
* specified node types. The results are dependent on there being only one type of relation
* between two node types (not enforced, thus unpredictable). Makes use of a typeRelNodes.
*
* @param snum The first objectnode type (the source)
* @param dnum The second objectnode type (the destination)
* @return the number of the found relation, or -1 if either no relation was found, or more than
* one was found.
*/
public int getAllowedRelationType(int snum, int dnum) {
Set<MMObjectNode> set =
new HashSet<MMObjectNode>(typeRelNodes.getBySourceDestination(snum, dnum));
set.addAll(inverseTypeRelNodes.getByDestinationSource(dnum, snum));
if (set.size() != 1) {
return -1;
} else {
MMObjectNode n = set.iterator().next();
return n.getIntValue("rnumber");
}
}
/**
* A Set of all allowed relations of a certain role between two builders. Distinction is made
* between source and destination depending on passed directionality.
*
* @since MMBase-1.6.2
*/
public Set<MMObjectNode> getAllowedRelations(
int builder1, int builder2, int role, int directionality) {
Set<MMObjectNode> res = new HashSet<MMObjectNode>();
if (directionality != RelationStep.DIRECTIONS_SOURCE) {
res.addAll(typeRelNodes.getBySourceDestinationRole(builder1, builder2, role));
}
if (directionality != RelationStep.DIRECTIONS_DESTINATION
&& (directionality != RelationStep.DIRECTIONS_EITHER || res.isEmpty())) {
res.addAll(inverseTypeRelNodes.getByDestinationSourceRole(builder2, builder1, role));
}
return res;
}
