/**
* Locate the select clause that is part of this select statement. Note, that this might return
* null as derived select clauses (i.e., no select clause at the HQL-level) get generated much
* later than when we get created; thus it depends upon lifecycle.
*
* @return Our select clause, or null.
*/
public final SelectClause getSelectClause() {
// Due to the complexity in initializing the SelectClause, do not generate one here.
// If it is not found; simply return null...
//
// Also, do not cache since it gets generated well after we are created.
return (SelectClause) ASTUtil.findTypeInChildren(this, SqlTokenTypes.SELECT_CLAUSE);
}
public final OrderByClause getOrderByClause() {
if (orderByClause == null) {
orderByClause = locateOrderByClause();
// if there is no order by, make one
if (orderByClause == null) {
log.debug("getOrderByClause() : Creating a new ORDER BY clause");
orderByClause =
(OrderByClause)
ASTUtil.create(getWalker().getASTFactory(), SqlTokenTypes.ORDER, "ORDER");
// Find the WHERE; if there is no WHERE, find the FROM...
AST prevSibling = ASTUtil.findTypeInChildren(this, SqlTokenTypes.WHERE);
if (prevSibling == null) {
prevSibling = ASTUtil.findTypeInChildren(this, SqlTokenTypes.FROM);
}
// Now, inject the newly built ORDER BY into the tree
orderByClause.setNextSibling(prevSibling.getNextSibling());
prevSibling.setNextSibling(orderByClause);
}
}
return orderByClause;
}
private OrderByClause locateOrderByClause() {
return (OrderByClause) ASTUtil.findTypeInChildren(this, SqlTokenTypes.ORDER);
}