/**
* Join ::= left [JoinType] 'JOIN' right 'ON' JoinCondition
* // If JoinType is omitted INNER is assumed.
* left ::= Source
* right ::= Source
*
* JoinType ::= Inner | LeftOuter | RightOuter
* Inner ::= 'INNER'
* LeftOuter ::= 'LEFT OUTER'
* RightOuter ::= 'RIGHT OUTER'
*
* @param QOM\JoinInterface $join
* @return string
*/
protected function convertJoin(QOM\JoinInterface $join)
{
$left = $this->convertSource($join->getLeft());
$right = $this->convertSource($join->getRight());
$condition = $this->convertJoinCondition($join->getJoinCondition());
return $this->generator->evalJoin($left, $right, $condition, $this->generator->evalJoinType($join->getJoinType()));
}
/**
* @param QOM\JoinInterface $source
* @param boolean $root whether the method call is recursed for nested joins. If true, it will add a WHERE clause
* that checks the workspace_name and type
*
* @return string
*
* @throws NotImplementedException if the right side of the join consists of another join
*/
public function walkJoinSource(QOM\JoinInterface $source, $root = true)
{
$this->source = $left = $source->getLeft();
// The $left variable is used for storing the leftmost selector
if (!$source->getRight() instanceof QOM\SelectorInterface) {
throw new NotImplementedException('The right side of the join should not consist of another join');
}
if ($source->getLeft() instanceof QOM\SelectorInterface) {
$leftAlias = $this->getTableAlias($source->getLeft()->getSelectorName());
$this->getTableAlias($source->getLeft()->getSelectorName());
$sql = "FROM phpcr_nodes {$leftAlias} ";
} else {
$sql = $this->walkJoinSource($left, false) . ' ';
// One step left, until we're at the selector
$leftAlias = $this->getTableAlias($this->getRightJoinSelector($source->getLeft()->getJoinCondition()));
while (!$left instanceof QOM\SelectorInterface) {
$left = $left->getLeft();
}
}
$rightAlias = $this->getTableAlias($source->getRight()->getSelectorName());
$nodeTypeClause = $this->sqlNodeTypeClause($rightAlias, $source->getRight());
switch ($source->getJoinType()) {
case QOM\QueryObjectModelConstantsInterface::JCR_JOIN_TYPE_INNER:
$sql .= "INNER JOIN phpcr_nodes {$rightAlias} ";
break;
case QOM\QueryObjectModelConstantsInterface::JCR_JOIN_TYPE_LEFT_OUTER:
$sql .= "LEFT JOIN phpcr_nodes {$rightAlias} ";
break;
case QOM\QueryObjectModelConstantsInterface::JCR_JOIN_TYPE_RIGHT_OUTER:
$sql .= "RIGHT JOIN phpcr_nodes {$rightAlias} ";
break;
}
$sql .= "ON ( {$leftAlias}.workspace_name = {$rightAlias}.workspace_name AND {$nodeTypeClause} ";
$sql .= "AND " . $this->walkJoinCondition($source->getLeft(), $source->getRight(), $source->getJoinCondition()) . " ";
$sql .= ") ";
// close on-clause
if ($root) {
// The method call is not recursed when $root is true, so we can add a WHERE clause
// TODO: revise this part for alternatives
$sql .= "WHERE {$leftAlias}.workspace_name = ? AND {$leftAlias}.type IN ('" . $left->getNodeTypeName() . "'";
$subTypes = $this->nodeTypeManager->getSubtypes($left->getNodeTypeName());
foreach ($subTypes as $subType) {
/* @var $subType \PHPCR\NodeType\NodeTypeInterface */
$sql .= ", '" . $subType->getName() . "'";
}
$sql .= ')';
}
return $sql;
}
/**
* @param QOM\JoinInterface $source
*
* @return string
*
* @throws NotImplementedException
*/
public function walkJoinSource(QOM\JoinInterface $source)
{
if (!$source->getLeft() instanceof QOM\SelectorInterface || !$source->getRight() instanceof QOM\SelectorInterface) {
throw new NotImplementedException("Join with Joins");
}
$this->source = $source->getLeft();
$leftAlias = $this->getTableAlias($source->getLeft()->getSelectorName());
$sql = "FROM phpcr_nodes {$leftAlias} ";
$rightAlias = $this->getTableAlias($source->getRight()->getSelectorName());
$nodeTypeClause = $this->sqlNodeTypeClause($rightAlias, $source->getRight());
switch ($source->getJoinType()) {
case QOM\QueryObjectModelConstantsInterface::JCR_JOIN_TYPE_INNER:
$sql .= "INNER JOIN phpcr_nodes {$rightAlias} ";
break;
case QOM\QueryObjectModelConstantsInterface::JCR_JOIN_TYPE_LEFT_OUTER:
$sql .= "LEFT JOIN phpcr_nodes {$rightAlias} ";
break;
case QOM\QueryObjectModelConstantsInterface::JCR_JOIN_TYPE_RIGHT_OUTER:
$sql .= "RIGHT JOIN phpcr_nodes {$rightAlias} ";
break;
}
$sql .= "ON ( {$leftAlias}.workspace_name = {$rightAlias}.workspace_name AND {$nodeTypeClause} ";
$sql .= "AND " . $this->walkJoinCondition($source->getLeft(), $source->getRight(), $source->getJoinCondition()) . " ";
$sql .= ") ";
// close on-clause
$sql .= "WHERE {$leftAlias}.workspace_name = ? AND {$leftAlias}.type IN ('" . $source->getLeft()->getNodeTypeName() . "'";
$subTypes = $this->nodeTypeManager->getSubtypes($source->getLeft()->getNodeTypeName());
foreach ($subTypes as $subType) {
/* @var $subType \PHPCR\NodeType\NodeTypeInterface */
$sql .= ", '" . $subType->getName() . "'";
}
$sql .= ')';
return $sql;
}