private FromElement createCollectionJoin(JoinSequence collectionJoinSequence, String tableAlias)
throws SemanticException {
String text = queryableCollection.getTableName();
AST ast = createFromElement(text);
FromElement destination = (FromElement) ast;
Type elementType = queryableCollection.getElementType();
if (elementType.isCollectionType()) {
throw new SemanticException("Collections of collections are not supported!");
}
destination.initializeCollection(fromClause, classAlias, tableAlias);
destination.setType(JOIN_FRAGMENT); // Tag this node as a JOIN.
destination.setIncludeSubclasses(false); // Don't include subclasses in the join.
destination.setCollectionJoin(true); // This is a clollection join.
destination.setJoinSequence(collectionJoinSequence);
destination.setOrigin(origin, false);
destination.setCollectionTableAlias(tableAlias);
// origin.addDestination( destination );
// This was the cause of HHH-242
// origin.setType( FROM_FRAGMENT ); // Set the parent node type so that the AST is properly
// formed.
origin.setText(""); // The destination node will have all the FROM text.
origin.setCollectionJoin(
true); // The parent node is a collection join too (voodoo - see JoinProcessor)
fromClause.addCollectionJoinFromElementByPath(path, destination);
fromClause.getWalker().addQuerySpaces(queryableCollection.getCollectionSpaces());
return destination;
}
public FromElement createEntityJoin(
String entityClass,
String tableAlias,
JoinSequence joinSequence,
boolean fetchFlag,
boolean inFrom,
EntityType type,
String role,
String joinPath)
throws SemanticException {
FromElement elem = createJoin(entityClass, tableAlias, joinSequence, type, false);
elem.setFetch(fetchFlag);
if (joinPath != null) {
elem.applyTreatAsDeclarations(fromClause.getWalker().getTreatAsDeclarationsByPath(joinPath));
}
EntityPersister entityPersister = elem.getEntityPersister();
int numberOfTables = entityPersister.getQuerySpaces().length;
if (numberOfTables > 1 && implied && !elem.useFromFragment()) {
LOG.debug("createEntityJoin() : Implied multi-table entity join");
elem.setUseFromFragment(true);
}
// If this is an implied join in a FROM clause, then use ANSI-style joining, and set the
// flag on the FromElement that indicates that it was implied in the FROM clause itself.
if (implied && inFrom) {
joinSequence.setUseThetaStyle(false);
elem.setUseFromFragment(true);
elem.setImpliedInFromClause(true);
}
if (elem.getWalker().isSubQuery()) {
// two conditions where we need to transform this to a theta-join syntax:
// 1) 'elem' is the "root from-element" in correlated subqueries
// 2) The DotNode.useThetaStyleImplicitJoins has been set to true
// and 'elem' represents an implicit join
if (elem.getFromClause() != elem.getOrigin().getFromClause()
||
// ( implied && DotNode.useThetaStyleImplicitJoins ) ) {
PathSeparatorNode.useThetaStyleImplicitJoins) {
// the "root from-element" in correlated subqueries do need this piece
elem.setType(FROM_FRAGMENT);
joinSequence.setUseThetaStyle(true);
elem.setUseFromFragment(false);
}
}
elem.setRole(role);
return elem;
}
private FromElement initializeJoin(
String path,
FromElement destination,
JoinSequence joinSequence,
String[] columns,
FromElement origin,
boolean manyToMany) {
destination.setType(JOIN_FRAGMENT);
destination.setJoinSequence(joinSequence);
destination.setColumns(columns);
destination.setOrigin(origin, manyToMany);
fromClause.addJoinByPathMap(path, destination);
return destination;
}