/**
* Preprocess on the from clause to add super and secondary roots
* @return boolean
* @throws epExceptionQueryBuilder
*/
private function processFrom()
{
// check if we have already done? (if done, root alias must have been set.)
if ($this->primary_alias) {
return true;
}
// get from node
if (!($from = $this->root->getChild('from'))) {
throw new epExceptionQueryBuilder($this->_e("cannot found 'from' clause"));
return false;
}
// get from items
if (!($items = $from->getChildren())) {
throw new epExceptionQueryBuilder($this->_e("no 'from' items specified"));
return false;
}
// get the super root (the 1st) from 'from' items
$item = array_shift($items);
// add the super root
$this->primary_class = $item->getParam('class');
$this->primary_alias = $item->getParam('alias');
$this->pm->addPrimaryRoot($this->primary_class, $this->primary_alias);
// go through the rest: secondary roots
foreach ($items as &$item) {
// get class from item
$class = $item->getParam('class');
// a secondary root must have alias assigned
if (!($alias = $item->getParam('alias'))) {
// skip if not
throw new epExceptionQueryBuilder($this->_e("no alias defined for class [{$class}]"));
continue;
}
// keep track of aliases for secondary
$this->aliases_secondary[] = $alias;
// add class as a secondary root
$this->pm->addSecondaryRoot($class, $alias);
}
return true;
}
