identifier = $identifier; return $this; } public function getIdentifier() { return $this->identifier; } public function setEpoch($epoch) { $this->epoch = $epoch; return $this; } public function getEpoch() { return $this->epoch; } public function setBranch($branch) { $this->branch = $branch; return $this; } public function getBranch() { return $this->branch; } public function setIsPermanent($is_permanent) { $this->isPermanent = $is_permanent; return $this; } public function getIsPermanent() { return $this->isPermanent; } public function setParents(array $parents) { $this->parents = $parents; return $this; } public function getParents() { return $this->parents; } }