void registerFromElement(FromElement element) {
fromElements.add(element);
String classAlias = element.getClassAlias();
if (classAlias != null) {
// The HQL class alias refers to the class name.
fromElementByClassAlias.put(classAlias, element);
}
// Associate the table alias with the element.
String tableAlias = element.getTableAlias();
if (tableAlias != null) {
fromElementByTableAlias.put(tableAlias, element);
}
}
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;
}
