/**
* Check if link (tuple of src and tgt atom) exists in relation
* @param Atom $leftAtom
* @param Atom $rightAtom
* @param boolean $isFlipped
* @return boolean
*/
public function linkExists(Atom $leftAtom, Atom $rightAtom, $isFlipped = false)
{
// Determine src and tgt atom based on $isFlipped
$srcAtom = $isFlipped ? $rightAtom : $leftAtom;
$tgtAtom = $isFlipped ? $leftAtom : $rightAtom;
$this->logger->debug("Checking if link ({$srcAtom},{$tgtAtom}) exists in relation '{$this}'");
// Checks
if (!in_array($srcAtom->concept, $this->srcConcept->getSpecializationsIncl())) {
throw new Exception("Cannot check if link ({$srcAtom},{$tgtAtom}) exists in relation '{$this}', because source atom does not match relation source concept or any of its specializations", 500);
}
if (!in_array($tgtAtom->concept, $this->tgtConcept->getSpecializationsIncl())) {
throw new Exception("Cannot check if link ({$srcAtom},{$tgtAtom}) exists in relation '{$this}', because target atom does not match relation target concept or any of its specializations", 500);
}
if (is_null($srcAtom->id) || is_null($tgtAtom->id)) {
throw new Exception("Cannot check if link ({$srcAtom},{$tgtAtom}) exists in relation '{$this}', because src and or tgt atom is not specified", 500);
}
return $this->db->linkExists($this, $srcAtom, $tgtAtom);
}
