bool
CRDFNode::removeEdge(const CRDFPredicate & predicate, CRDFNode * pObject)
{
bool deletedSomething = false;
// Determine whether the predicate points to a bag node
std::set< CRDFTriplet > Triplets = mGraph.getTriplets(this, predicate);
// Debugging
assert(Triplets.size() > 0);
CRDFNode * pTarget = Triplets.begin()->pObject;
if (pTarget->isBagNode() && pTarget != pObject)
{
deletedSomething |= pTarget->removeEdge(CRDFPredicate::rdf_li, pObject);
Triplets = mGraph.getTriplets(pTarget, CRDFPredicate::rdf_li);
switch (Triplets.size())
{
case 0:
// If pTarget is an empty bag node we remove it.
// Note, this will destroy pTarget, i.e., no need to unbag
deletedSomething |= removeEdge(predicate, pTarget);
break;
default:
// We have more than 1 rdf_li element left.
break;
}
return deletedSomething;
}
deletedSomething |= removeTripletFromGraph(CRDFTriplet(this, predicate, pObject));
return deletedSomething;
}
bool CRDFNode::setFieldValue(const std::string & value,
const CRDFPredicate::ePredicateType & predicate,
const CRDFPredicate::Path & nodePath)
{
std::set< CRDFTriplet > Triplets =
getDescendantsWithPredicate(predicate);
CRDFNode * pObject = NULL;
if (Triplets.size() > 0)
pObject = Triplets.begin()->pObject;
// Check whether the value is not empty.
if (value != "")
{
// We do not have an object
if (pObject == NULL)
{
// We build each missing ancestor as a blank node.
CRDFPredicate::sAllowedLocation const * pLocation = NULL;
CRDFNode * pParent = createMissingAncestors(nodePath, predicate, pLocation);
if (pParent == NULL) return false;
// Create the missing object
CRDFObject object;
object.setType(pLocation->Type);
if (object.getType() == CRDFObject::BLANK_NODE)
object.setBlankNodeId(mGraph.generatedNodeId());
CRDFTriplet Triplet =
mGraph.addTriplet(pParent->getSubject(), CRDFPredicate::getURI(predicate), object);
if (!Triplet)
return false;
pObject = Triplet.pObject;
// Debugging
assert(pObject != NULL);
}
// Now we finally can save the information.
CRDFObject & Object = pObject->getObject();
switch (Object.getType())
{
case CRDFObject::LITERAL:
{
CRDFLiteral & Literal = Object.getLiteral();
Literal.setType(CRDFLiteral::PLAIN);
Literal.setLexicalData(value);
}
break;
case CRDFObject::RESOURCE:
Object.setResource(value, false);
break;
case CRDFObject::BLANK_NODE:
fatalError();
break;
}
}
else if (pObject != NULL)
removeTripletFromGraph(*Triplets.begin());
return true;
}
