/**
* starts join
* @return \qinq\Object\Query\Join
*/
public function execute()
{
$collection = $this->getCollection();
$fn = $this->getCallback();
$arr = $collection->toArray();
$args = $this->getArguments();
if (empty($fn) && count($args) === 1) {
$this->group = [new qinq\Collection($arr), new qinq\Collection($args[0])];
} elseif (!empty($fn)) {
$arr1 = array_filter($arr, $fn);
$arr2 = array_diff($arr, $arr1);
$this->group = [new qinq\Collection($arr), new qinq\Collection($arr2)];
}
if (qtil\ArrayUtil::isIterable($this->group) && qtil\ArrayUtil::isMultiObject($this->group)) {
return $this;
}
}
/**
* Default XML query execution path
* @return mixed
*/
function execute()
{
$result = parent::execute();
if (empty($result)) {
return null;
}
$reduce = function ($val) {
if (is_scalar($val)) {
return $val;
} elseif ($val instanceof \DOMDocument) {
return $val;
} elseif ($val instanceof \SimpleXMLElement) {
return $val;
}
return $val;
};
if (empty($this['xpath'])) {
return $reduce($result[0]);
}
if (qtil\ArrayUtil::isMultiObject($result->toArray()) && count($result) == 1) {
$val = $result[$result->keys()[0]];
return new qinq\Collection($val);
}
return $result->filter();
}
