protected void processQuery(AST select, AST query) throws SemanticException {
if (log.isDebugEnabled()) {
log.debug("processQuery() : " + query.toStringTree());
}
try {
QueryNode qn = (QueryNode) query;
// Was there an explicit select expression?
boolean explicitSelect = select != null && select.getNumberOfChildren() > 0;
if (!explicitSelect) {
// No explicit select expression; render the id and properties
// projection lists for every persister in the from clause into
// a single 'token node'.
// TODO: the only reason we need this stuff now is collection filters,
// we should get rid of derived select clause completely!
createSelectClauseFromFromClause(qn);
} else {
// Use the explicitly declared select expression; determine the
// return types indicated by each select token
useSelectClause(select);
}
// After that, process the JOINs.
// Invoke a delegate to do the work, as this is farily complex.
JoinProcessor joinProcessor = new JoinProcessor(astFactory, queryTranslatorImpl);
joinProcessor.processJoins(qn, isSubQuery());
// Attach any mapping-defined "ORDER BY" fragments
Iterator itr = qn.getFromClause().getProjectionList().iterator();
while (itr.hasNext()) {
final FromElement fromElement = (FromElement) itr.next();
// if ( fromElement.isFetch() && fromElement.isCollectionJoin() ) {
if (fromElement.isFetch() && fromElement.getQueryableCollection() != null) {
// Does the collection referenced by this FromElement
// specify an order-by attribute? If so, attach it to
// the query's order-by
if (fromElement.getQueryableCollection().hasOrdering()) {
String orderByFragment =
fromElement
.getQueryableCollection()
.getSQLOrderByString(fromElement.getCollectionTableAlias());
qn.getOrderByClause().addOrderFragment(orderByFragment);
}
if (fromElement.getQueryableCollection().hasManyToManyOrdering()) {
String orderByFragment =
fromElement
.getQueryableCollection()
.getManyToManyOrderByString(fromElement.getTableAlias());
qn.getOrderByClause().addOrderFragment(orderByFragment);
}
}
}
} finally {
popFromClause();
}
}
protected void createFromJoinElement(
AST path, AST alias, int joinType, AST fetchNode, AST propertyFetch, AST with)
throws SemanticException {
boolean fetch = fetchNode != null;
if (fetch && isSubQuery()) {
throw new QueryException("fetch not allowed in subquery from-elements");
}
// The path AST should be a DotNode, and it should have been evaluated already.
if (path.getType() != SqlTokenTypes.DOT) {
throw new SemanticException("Path expected for join!");
}
DotNode dot = (DotNode) path;
int hibernateJoinType = JoinProcessor.toHibernateJoinType(joinType);
dot.setJoinType(hibernateJoinType); // Tell the dot node about the join type.
dot.setFetch(fetch);
// Generate an explicit join for the root dot node. The implied joins will be collected and
// passed up
// to the root dot node.
dot.resolve(true, false, alias == null ? null : alias.getText());
FromElement fromElement = dot.getImpliedJoin();
fromElement.setAllPropertyFetch(propertyFetch != null);
if (with != null) {
if (fetch) {
throw new SemanticException("with-clause not allowed on fetched associations; use filters");
}
handleWithFragment(fromElement, with);
}
if (log.isDebugEnabled()) {
log.debug(
"createFromJoinElement() : "
+ getASTPrinter().showAsString(fromElement, "-- join tree --"));
}
}
protected void setImpliedJoinType(int joinType) {
impliedJoinType = JoinProcessor.toHibernateJoinType(joinType);
}