public function modifyQuery(DpleQuery &$query)
{
global $wgDpleMaxCost;
/** Throw an exception if there is no WHERE clause. */
if (!$query->getConds()) {
throw new Scribunto_LuaError(wfMessage('dple-error-no-criteria')->text());
}
/** Sum up the total cost. */
$this->totalCost_ = 0;
foreach ($this->getFeatures() as $feature) {
$this->totalCost_ += $feature->getCost();
}
/** Throw an exception if @ref $totalCost_ exceeds @ref
* $wgDpleMaxCost#. */
if ($this->totalCost_ > $wgDpleMaxCost) {
throw new Scribunto_LuaError(wfMessage('dple-error-too-expensive', $this->totalCost_, $wgDpleMaxCost)->text());
}
}
