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<?php
namespace Civi\Api4\Service\Schema;
use Civi\Api4\Query\Api4SelectQuery;
use Civi\Api4\Service\Schema\Joinable\Joinable;
class Joiner {
/**
* @var SchemaMap
*/
protected $schemaMap;
/**
* @var Joinable[][]
*/
protected $cache = [];
/**
* @param SchemaMap $schemaMap
*/
public function __construct(SchemaMap $schemaMap) {
$this->schemaMap = $schemaMap;
}
/**
* @param Api4SelectQuery $query
* The query object to do the joins on
* @param string $joinPath
* A path of aliases in dot notation, e.g. contact.phone
* @param string $side
* Can be LEFT or INNER
*
* @throws \Exception
* @return Joinable[]
* The path used to make the join
*/
public function join(Api4SelectQuery $query, $joinPath, $side = 'LEFT') {
$fullPath = $this->getPath($query->getFrom(), $joinPath);
$baseTable = $query::MAIN_TABLE_ALIAS;
foreach ($fullPath as $link) {
$target = $link->getTargetTable();
$alias = $link->getAlias();
$conditions = $link->getConditionsForJoin($baseTable);
$query->join($side, $target, $alias, $conditions);
$query->addJoinedTable($link);
$baseTable = $link->getAlias();
}
return $fullPath;
}
/**
* @param Api4SelectQuery $query
* @param $joinPath
*
* @return bool
*/
public function canJoin(Api4SelectQuery $query, $joinPath) {
return !empty($this->getPath($query->getFrom(), $joinPath));
}
/**
* @param string $baseTable
* @param string $joinPath
*
* @return array
* @throws \Exception
*/
protected function getPath($baseTable, $joinPath) {
$cacheKey = sprintf('%s.%s', $baseTable, $joinPath);
if (!isset($this->cache[$cacheKey])) {
$stack = explode('.', $joinPath);
$fullPath = [];
foreach ($stack as $key => $targetAlias) {
$links = $this->schemaMap->getPath($baseTable, $targetAlias);
if (empty($links)) {
throw new \Exception(sprintf('Cannot join %s to %s', $baseTable, $targetAlias));
}
else {
$fullPath = array_merge($fullPath, $links);
$lastLink = end($links);
$baseTable = $lastLink->getTargetTable();
}
}
$this->cache[$cacheKey] = $fullPath;
}
return $this->cache[$cacheKey];
}
}
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