private function fetch()
{
if ($this->it->valid()) {
$v = $this->it->current();
$k = $this->it->key();
$this->v = $this->valueSelector->select($v, $k);
$this->k = $this->keySelector->select($v, $k);
}
}
protected function fetchOuter()
{
if ($this->outer->valid()) {
$this->outerV = $this->outer->current();
$this->outerK = $this->outer->key();
$this->inner = IteratorUtil::iterator($this->manySelector->select($this->outerV, $this->outerK));
} else {
$this->inner = null;
}
}
protected function fetchIfValid()
{
if ($this->outer->valid()) {
$outerV = $this->outer->current();
$outerK = $this->outer->key();
$compareKey = $this->outerCompareKeySelector->select($outerV, $outerK);
$inners = $this->lookup->get($compareKey);
$inners = new GroupingGinq(IteratorUtil::iterator($inners), $compareKey);
$this->v = $this->resultValueSelector->select($outerV, $inners, $outerK, $compareKey);
$this->k = $this->outer->key();
}
}
/**
* @param mixed $v0 - left value
* @param mixed $v1 - right value
* @param mixed|null $k0 - left key
* @param mixed|null $k1 - right key
* @return int
*/
public function compare($v0, $v1, $k0 = null, $k1 = null)
{
return $this->comparer->compare($this->compareKeySelector->select($v0, $k0), $this->compareKeySelector->select($v1, $k1), $k0, $k1);
}