FromElement createCollection(
QueryableCollection queryableCollection,
String role,
int joinType,
boolean fetchFlag,
boolean indexed)
throws SemanticException {
if (!collection) {
throw new IllegalStateException("FromElementFactory not initialized for collections!");
}
this.inElementsFunction = indexed;
FromElement elem;
this.queryableCollection = queryableCollection;
collectionType = queryableCollection.getCollectionType();
String roleAlias = fromClause.getAliasGenerator().createName(role);
// Correlated subqueries create 'special' implied from nodes
// because correlated subselects can't use an ANSI-style join
boolean explicitSubqueryFromElement = fromClause.isSubQuery() && !implied;
if (explicitSubqueryFromElement) {
String pathRoot = StringHelper.root(path);
FromElement origin = fromClause.getFromElement(pathRoot);
if (origin == null || origin.getFromClause() != fromClause) {
implied = true;
}
}
// super-duper-classic-parser-regression-testing-mojo-magic...
if (explicitSubqueryFromElement && DotNode.useThetaStyleImplicitJoins) {
implied = true;
}
Type elementType = queryableCollection.getElementType();
if (elementType.isEntityType()) { // A collection of entities...
elem = createEntityAssociation(role, roleAlias, joinType);
} else if (elementType.isComponentType()) { // A collection of components...
JoinSequence joinSequence = createJoinSequence(roleAlias, joinType);
elem = createCollectionJoin(joinSequence, roleAlias);
} else { // A collection of scalar elements...
JoinSequence joinSequence = createJoinSequence(roleAlias, joinType);
elem = createCollectionJoin(joinSequence, roleAlias);
}
elem.setRole(role);
elem.setQueryableCollection(queryableCollection);
// Don't include sub-classes for implied collection joins or subquery joins.
if (implied) {
elem.setIncludeSubclasses(false);
}
if (explicitSubqueryFromElement) {
elem.setInProjectionList(true); // Treat explict from elements in sub-queries properly.
}
if (fetchFlag) {
elem.setFetch(true);
}
return elem;
}
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 void renderNonScalarIdentifiers(
FromElement fromElement,
int nonscalarSize,
int j,
SelectExpression expr,
ASTAppender appender) {
String text = fromElement.renderIdentifierSelect(nonscalarSize, j);
if (!fromElement.getFromClause().isSubQuery()) {
if (!scalarSelect && !getWalker().isShallowQuery()) {
// TODO: is this a bit ugly?
expr.setText(text);
} else {
appender.append(SqlTokenTypes.SQL_TOKEN, text, false);
}
}
}
private FromElement createFromElementInSubselect(
String path, String pathAlias, FromElement parentFromElement, String classAlias)
throws SemanticException {
if (log.isDebugEnabled()) {
log.debug("createFromElementInSubselect() : path = " + path);
}
// Create an DotNode AST for the path and resolve it.
FromElement fromElement = evaluateFromElementPath(path, classAlias);
EntityPersister entityPersister = fromElement.getEntityPersister();
// If the first identifier in the path referrs to the class alias (not the class name), then
// this
// is a correlated subselect. If it's a correlated sub-select, use the existing table alias.
// Otherwise
// generate a new one.
String tableAlias = null;
boolean correlatedSubselect = pathAlias.equals(parentFromElement.getClassAlias());
if (correlatedSubselect) {
tableAlias = fromElement.getTableAlias();
} else {
tableAlias = null;
}
// If the from element isn't in the same clause, create a new from element.
if (fromElement.getFromClause() != fromClause) {
if (log.isDebugEnabled()) {
log.debug("createFromElementInSubselect() : creating a new FROM element...");
}
fromElement = createFromElement(entityPersister);
initializeAndAddFromElement(
fromElement,
path,
classAlias,
entityPersister,
(EntityType) ((Queryable) entityPersister).getType(),
tableAlias);
}
if (log.isDebugEnabled()) {
log.debug("createFromElementInSubselect() : " + path + " -> " + fromElement);
}
return fromElement;
}