How is Magento\Tax\Model\Config::getCalculationSequence() implemented and used?

dmitry_fedyuk · February 2, 2017, 7:05pm

Context:

Implementation

magento/magento2/blob/2.1.3/app/code/Magento/Tax/Model/Config.php#L228-L251


/**
 * Get taxes/discounts calculation sequence.
 * This sequence depends on "Apply Customer Tax" and "Apply Discount On Prices" configuration options.
 *
 * @param   null|int|string|Store $store
 * @return  string
 */
public function getCalculationSequence($store = null)
{
    if ($this->applyTaxAfterDiscount($store)) {
        if ($this->discountTax($store)) {
            $seq = \Magento\Tax\Model\Calculation::CALC_TAX_AFTER_DISCOUNT_ON_INCL;
        } else {
            $seq = \Magento\Tax\Model\Calculation::CALC_TAX_AFTER_DISCOUNT_ON_EXCL;
        }
    } else {
        if ($this->discountTax($store)) {
            $seq = \Magento\Tax\Model\Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_INCL;
        } else {
            $seq = \Magento\Tax\Model\Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_EXCL;
        }
    }
    return $seq;
}

The single usage

Magento\Tax\Model\Sales\Total\Quote\Tax::processConfigArray()

github.com

magento/magento2/blob/a2cf9b8/app/code/Magento/Tax/Model/Sales/Total/Quote/Tax.php#L398-L418


/**
 * Process model configuration array.
 * This method can be used for changing totals collect sort order
 *
 * @param   array $config
 * @param   store $store
 * @return  array
 */
public function processConfigArray($config, $store)
{
    $calculationSequence = $this->_taxData->getCalculationSequence($store);
    switch ($calculationSequence) {
        case Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_INCL:
            $config['before'][] = 'discount';
            break;
        default:
            $config['after'][] = 'discount';
            break;
    }
    return $config;
}

dmitry_fedyuk · February 2, 2017, 11:14pm