Item::Ptr UTransform::TransformResult::next(DynamicContext *context)
{
context->testInterrupt();
AutoVariableStoreReset reset(context, &scope_);
if(toDo_) {
toDo_ = false;
NodeSet copiedNodes = NodeSet(nodecompare(context));
VectorOfCopyBinding::const_iterator end = transform_->getBindings()->end();
for(VectorOfCopyBinding::const_iterator it = transform_->getBindings()->begin();
it != end; ++it) {
if((*it)->qname_ == 0) continue;
Sequence values = (*it)->expr_->createResult(context)->toSequence(context);
// Keep a record of the nodes that have been copied
Result valIt = values;
Item::Ptr val;
while((val = valIt->next(context)).notNull()) {
copiedNodes.insert((Node*)val.get());
}
scope_.setVar((*it)->uri_, (*it)->name_, values);
}
// Get the pending update list
PendingUpdateList pul = transform_->getModifyExpr()->createUpdateList(context);
// Check that the targets of the pending updates are copied nodes
for(PendingUpdateList::const_iterator i = pul.begin(); i != pul.end(); ++i) {
Node::Ptr target = i->getTarget();
while(copiedNodes.find(target) == copiedNodes.end()) {
target = target->dmParent(context);
if(target.isNull()) {
XQThrow3(StaticErrorException,X("UTransform::staticTyping"),
X("The target node of an update expression in the transform expression is not a node from the copy clauses [err:XUDY0014]"), &(*i));
}
}
}
// Apply the updates
AutoDelete<UpdateFactory> ufactory(context->createUpdateFactory());
ufactory->applyUpdates(pul, context, transform_->getRevalidationMode());
// Execute the return expression
result_ = transform_->getReturnExpr()->createResult(context);
}
Item::Ptr result = result_->next(context);
if(result.isNull()) {
result_ = 0;
return 0;
}
return result;
}
void DbXmlUpdateFactory::checkUpdates(const PendingUpdateList &pul, DynamicContext *context, DocumentCache::ValidationMode valMode)
{
DocSet docMap;
PendingUpdateList::const_iterator i;
for (i = pul.begin(); i != pul.end(); ++i) {
switch (i->getType()) {
case PendingUpdate::PUDELETE: {
const DbXmlNodeImpl *nodeImpl = (const DbXmlNodeImpl*)i->getTarget().get();
u_int32_t level = nodeImpl->getNodeLevel();
// level 1 is children of the document node
if (level == 1
&& (nodeImpl->getType() == NodeInfo::ELEMENT)
&& nodeImpl->isUpdateAble()) {
Document *document = const_cast<Document*>(nodeImpl->getDocument());
DBXML_ASSERT(document);
DocSet::iterator it = docMap.find(DocClass(document));
if (it == docMap.end()) {
DocClass dc(document);
dc.setRootElementDeleted();
docMap.insert(dc);
} else {
const_cast<DocClass&>(*it).setRootElementDeleted();
}
}
break;
}
case PendingUpdate::INSERT_INTO:
case PendingUpdate::INSERT_INTO_AS_FIRST:
case PendingUpdate::INSERT_INTO_AS_LAST: {
const DbXmlNodeImpl *nodeImpl = (const DbXmlNodeImpl*)i->getTarget().get();
u_int32_t level = nodeImpl->getNodeLevel();
// level 0 is document node -- inserting a potential
// document/root element
if (level == 0 &&
nodeImpl->isUpdateAble()) {
int nElems = numElements(*i, context);
if (nElems != 0) {
Document *document = const_cast<Document*>(nodeImpl->getDocument());
DBXML_ASSERT(document);
DocSet::iterator it = docMap.find(DocClass(document));
if (it == docMap.end()) {
docMap.insert(DocClass(document, nElems, isEmptyDoc(nodeImpl)));
} else {
const_cast<DocClass&>(*it).incrCount(nElems);
}
}
}
break;
}
case PendingUpdate::INSERT_BEFORE:
case PendingUpdate::INSERT_AFTER: {
const DbXmlNodeImpl *nodeImpl = (const DbXmlNodeImpl*)i->getTarget().get();
u_int32_t level = nodeImpl->getNodeLevel();
// level 1 is a child of the document node
if (level == 1 &&
nodeImpl->isUpdateAble()) {
int nElems = numElements(*i, context);
if (nElems != 0) {
Document *document = const_cast<Document*>(nodeImpl->getDocument());
DBXML_ASSERT(document);
DocSet::iterator it = docMap.find(DocClass(document));
if (it == docMap.end()) {
docMap.insert(DocClass(document, nElems));
} else {
const_cast<DocClass&>(*it).incrCount(nElems);
}
}
}
break;
}
case PendingUpdate::REPLACE_NODE: {
const DbXmlNodeImpl *nodeImpl = (const DbXmlNodeImpl*)i->getTarget().get();
u_int32_t level = nodeImpl->getNodeLevel();
// level 1 is children of the document node
if (level == 1
&& (nodeImpl->getType() == NodeInfo::ELEMENT)
&& nodeImpl->isUpdateAble()) {
// replacing document element. If replacing 1 for 1, no-op
// if replacing with more or 0 elements, count
int nElems = numElements(*i, context);
if (nElems != 1) {
Document *document = const_cast<Document*>(nodeImpl->getDocument());
DBXML_ASSERT(document);
DocSet::iterator it = docMap.find(DocClass(document));
if (it == docMap.end()) {
DocClass dc(document);
if (nElems == 0)
dc.setRootElementDeleted();
else
dc.incrCount(nElems);
docMap.insert(dc);
} else {
if (nElems == 0)
const_cast<DocClass&>(*it).setRootElementDeleted();
else
const_cast<DocClass&>(*it).incrCount(nElems);
}
}
}
break;
}
default:
break;
}
}
// perform sanity checks.
for (DocSet::const_iterator it = docMap.begin(); it != docMap.end(); it++) {
const DocClass &dc = *it;
int count = dc.getNumRootElements();
if (count > 1) {
throw XmlException(XmlException::QUERY_EVALUATION_ERROR,
"Cannot perform an update that creates a persistent document with more than one document element");
} else if (count < 1) {
throw XmlException(XmlException::QUERY_EVALUATION_ERROR,
"Cannot perform an update that creates a persistent document with no document element");
}
}
}