lib/components/dataInterface/DataItem.php
public function getHandler()
    {
        if ($this->pairedDataItem) {
            if (!isset($this->primaryObject)) {
                return $this->pairedDataItem;
            } elseif (isset($this->companionObject)) {
                return static::getHandlingObject($this, $this->pairedDataItem);
            }
        }

        return $this;
    }
public function getHandler()
    {
        if ($this->pairedDataItem) {
            if (!isset($this->primaryObject)) {
                return $this->pairedDataItem;
            } elseif (isset($this->companionObject)) {
                return static::getHandlingObject($this, $this->pairedDataItem);
            }
        }

        return $this;
    }
Get handler.

@return [[@doctodo return_type:getHandler]] [[@doctodo return_description:getHandler]]