/**
* Create an SMWSparqlCondition from an SMWClassDescription.
*
* @param $description SMWClassDescription
* @param $joinVariable string name, see buildSparqlCondition()
* @param $orderByProperty mixed SMWDIProperty or null, see buildSparqlCondition()
* @return SMWSparqlCondition
*/
protected function buildClassCondition(SMWClassDescription $description, $joinVariable, $orderByProperty)
{
$condition = '';
$namespaces = array();
$instExpElement = SMWExporter::getSpecialPropertyResource('_INST');
foreach ($description->getCategories() as $diWikiPage) {
$categoryExpElement = SMWExporter::getResourceElementForWikiPage($diWikiPage);
$categoryName = SMWTurtleSerializer::getTurtleNameForExpElement($categoryExpElement);
$namespaces[$categoryExpElement->getNamespaceId()] = $categoryExpElement->getNamespace();
$newcondition = "{ ?{$joinVariable} " . $instExpElement->getQName() . " {$categoryName} . }\n";
if ($condition === '') {
$condition = $newcondition;
} else {
$condition .= "UNION\n{$newcondition}";
}
}
if ($condition === '') {
// empty disjunction: always false, no results to order
return new SMWSparqlFalseCondition();
}
$result = new SMWSparqlWhereCondition($condition, true, $namespaces);
$this->addOrderByDataForProperty($result, $joinVariable, $orderByProperty, SMWDataItem::TYPE_WIKIPAGE);
return $result;
}
public function prune( &$maxsize, &$maxdepth, &$log ) {
if ( $maxsize >= $this->getSize() ) {
$maxsize = $maxsize - $this->getSize();
return $this;
} elseif ( $maxsize <= 0 ) {
$log[] = $this->getQueryString();
$result = new SMWThingDescription();
} else {
$result = new SMWClassDescription( array_slice( $this->m_diWikiPages, 0, $maxsize ) );
$rest = new SMWClassDescription( array_slice( $this->m_diWikiPages, $maxsize ) );
$log[] = $rest->getQueryString();
$maxsize = 0;
}
$result->setPrintRequests( $this->getPrintRequests() );
return $result;
}