silverstripe / deploynaut

	 *

	 * @return DataObject|null The next step in the pipeline, or null if none remain.

	 */

	protected function findNextStep() {

		// otherwise get next step in chain

		$currentStep = $this->CurrentStep();

		return $this

			->Steps()

			->filter("Status", "Queued")

			->filter("Order:GreaterThanOrEqual", $currentStep->Order)

			->exclude("ID", $currentStep->ID)

			->sort("Order ASC")

			->first();

	}

	/**

	 *

	 * @return DataObject|null The previous step in the pipeline, or null if this is the first.

	 */

	public function findPreviousStep() {

		// otherwise get previous step in chain

		$currentStep = $this->CurrentStep();

		return $this

			->Steps()

			->filter("Status", "Finished")

			->filter("Order:LessThanOrEqual", $currentStep->Order)

			->exclude("ID", $currentStep->ID)

			->sort("Order DESC")

			->first();

	}

	/**