public void processJoins(QueryNode query) {
final FromClause fromClause = query.getFromClause();
final List fromElements;
if (DotNode.useThetaStyleImplicitJoins) {
// for regression testing against output from the old parser...
// found it easiest to simply reorder the FromElements here into ascending order
// in terms of injecting them into the resulting sql ast in orders relative to those
// expected by the old parser; this is definitely another of those "only needed
// for regression purposes". The SyntheticAndFactory, then, simply injects them as it
// encounters them.
fromElements = new ArrayList();
ListIterator liter =
fromClause.getFromElements().listIterator(fromClause.getFromElements().size());
while (liter.hasPrevious()) {
fromElements.add(liter.previous());
}
} else {
fromElements = fromClause.getFromElements();
}
// Iterate through the alias,JoinSequence pairs and generate SQL token nodes.
Iterator iter = fromElements.iterator();
while (iter.hasNext()) {
final FromElement fromElement = (FromElement) iter.next();
JoinSequence join = fromElement.getJoinSequence();
join.setSelector(
new JoinSequence.Selector() {
public boolean includeSubclasses(String alias) {
// The uber-rule here is that we need to include subclass joins if
// the FromElement is in any way dereferenced by a property from
// the subclass table; otherwise we end up with column references
// qualified by a non-existent table reference in the resulting SQL...
boolean containsTableAlias = fromClause.containsTableAlias(alias);
if (fromElement.isDereferencedBySubclassProperty()) {
// TODO : or should we return 'containsTableAlias'??
LOG.trace(
"Forcing inclusion of extra joins [alias="
+ alias
+ ", containsTableAlias="
+ containsTableAlias
+ "]");
return true;
}
boolean shallowQuery = walker.isShallowQuery();
boolean includeSubclasses = fromElement.isIncludeSubclasses();
boolean subQuery = fromClause.isSubQuery();
return includeSubclasses && containsTableAlias && !subQuery && !shallowQuery;
}
});
addJoinNodes(query, join, fromElement);
}
}
private void mergeJoins(JoinFragment ojf) throws MappingException, QueryException {
Iterator iter = joins.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry me = (Map.Entry) iter.next();
String name = (String) me.getKey();
JoinSequence join = (JoinSequence) me.getValue();
join.setSelector(
new JoinSequence.Selector() {
public boolean includeSubclasses(String alias) {
boolean include = returnedTypes.contains(alias) && !isShallowQuery();
return include;
}
});
if (typeMap.containsKey(name)) {
ojf.addFragment(join.toJoinFragment(enabledFilters, true));
} else if (collections.containsKey(name)) {
ojf.addFragment(join.toJoinFragment(enabledFilters, true));
} else {
// name from a super query (a bit inelegant that it shows up here)
}
}
}
