TaxCodeService.java 文件源码

/**
 * Find tax codes that apply to the items of a given invoice, looking for
 * custom fields named {@value #TAX_CODES_FIELD_NAME} that can be attached
 * to these items.
 *
 * @param invoice
 *            An invoice in which existing tax codes are to be found.
 * @return The existing tax codes, grouped by the identifiers of their
 *         related invoice items. Never {@code null}, and guaranteed not
 *         having any {@code null} values.
 * @throws NullPointerException
 *             when {@code invoice} is {@code null}.
 */
@Nonnull
public SetMultimap<UUID, TaxCode> findExistingTaxCodes(Invoice invoice) {
    Set<CustomField> taxFields = taxFieldsOfInvoices.get(invoice.getId());
    // Note: taxFields is not null, by Multimap contract

    ImmutableSetMultimap.Builder<UUID, TaxCode> taxCodesOfInvoiceItems = ImmutableSetMultimap.builder();
    for (CustomField taxField : taxFields) {
        if (!TAX_CODES_FIELD_NAME.equals(taxField.getFieldName())) {
            continue;
        }
        String taxCodesCSV = taxField.getFieldValue();
        if (taxCodesCSV == null) {
            continue;
        }
        UUID invoiceItemId = taxField.getObjectId();
        Set<TaxCode> taxCodes = cfg.findTaxCodes(taxCodesCSV, "from custom field '" + TAX_CODES_FIELD_NAME
                + "' of invoice item [" + invoiceItemId + "]");
        taxCodesOfInvoiceItems.putAll(invoiceItemId, taxCodes);
    }
    return taxCodesOfInvoiceItems.build();
}