Manager::buildPresets

private function buildPresets()
{
	if($this->presetList === null)
	{
		$this->presetList = array_filter(
			array_merge(
				$this->buildDefaultPresets(),
				$this->buildCustomPresets()
			),
			function(BasePreset $preset)
			{
				return $preset->getPossible();
			}
		);
	}

	return $this;
}