/**
* Updates the range matching the given identifier id and decreases its
* next pointer by one. Also free and taken properties are updated
* accordingly.
* @param integer $rangeId id of the range to be updated
* @return boolean true if and only if the operation succeeds; otherwise
* false
*/
public function decreaseByOne($rangeId)
{
// Get db access
$table = $this->getTable();
// Get ISBN range object
$range = $table->getRange($rangeId, false);
// Check that we have a result
if ($range != null) {
// Update free
$range->free += 1;
// Update taken
$range->taken -= 1;
// Check if closed
if ($range->is_closed) {
// Update is_closed and is_active
$range->is_closed = false;
$range->is_active = true;
// Range reopened, range end becomes next pointer
$range->next = $range->range_end;
} else {
// Decrease next pointer
$range->next = substr($range->next, 0, 3) - 1;
// Next pointer is a string, add left padding
$range->next = str_pad($range->next, 3, "0", STR_PAD_LEFT);
// Add ISSN range helper file
require_once JPATH_COMPONENT . '/helpers/issnrange.php';
// Get next pointer check digit
$rangeNextCheckDigit = IssnrangeHelper::countIssnCheckDigit($range->block . $range->next);
// Set next pointer check digit
$range->next .= $rangeNextCheckDigit;
// Validate next pointer
if (!IssnrangeHelper::validateIssn($range->block . $range->next)) {
$this->setError(JText::_('COM_ISSNREGISTRY_ERROR_ISSN_RANGE_UPDATE_INVALID_NEXT_POINTER'));
return false;
}
}
// Update to db
if ($table->updateDecrease($range)) {
return true;
}
}
return false;
}
