private function doPreliminarySubDescriptionCheck($subDescriptions, $joinVariable, $orderByProperty)
{
$count = count($subDescriptions);
// empty conjunction: true
if ($count == 0) {
return $this->compoundConditionBuilder->buildTrueCondition($joinVariable, $orderByProperty);
}
// conjunction with one element
if ($count == 1) {
return $this->compoundConditionBuilder->mapDescriptionToCondition(reset($subDescriptions), $joinVariable, $orderByProperty);
}
return null;
}
private function createConditionForRegexComparator($dataItem, $joinVariable, $orderByProperty, $comparator)
{
if (!$dataItem instanceof DIBlob && !$dataItem instanceof DIWikiPage && !$dataItem instanceof DIUri) {
return $this->compoundConditionBuilder->buildTrueCondition($joinVariable, $orderByProperty);
}
if ($dataItem instanceof DIBlob) {
$search = $dataItem->getString();
} else {
$search = $dataItem->getSortKey();
}
$pattern = '^' . str_replace(array('https://', 'http://', '%2A', '^', '.', '\\', '+', '{', '}', '(', ')', '|', '^', '$', '[', ']', '*', '?', '"'), array('', '', '*', '\\^', '\\.', '\\\\', '\\+', '\\{', '\\}', '\\(', '\\)', '\\|', '\\^', '\\$', '\\[', '\\]', '.*', '.', '\\"'), $search) . '$';
$condition = $this->createFilterConditionToMatchRegexPattern($dataItem, $joinVariable, $comparator, $pattern);
$this->compoundConditionBuilder->addOrderByDataForProperty($condition, $joinVariable, $orderByProperty, $dataItem->getDIType());
return $condition;
}
private function doResolveSubDescriptionsRecursively($subDescriptions, $joinVariable, $orderByProperty)
{
// Using a stdClass as data container for simpler handling in follow-up tasks
// and as the class is not exposed publicly we don't need to create
// an extra "real" class to manage its elements
$subConditionElements = new \stdClass();
$subConditionElements->unionCondition = '';
$subConditionElements->filter = '';
$namespaces = $weakConditions = array();
$hasSafeSubconditions = false;
foreach ($subDescriptions as $subDescription) {
$subCondition = $this->compoundConditionBuilder->mapDescriptionToCondition($subDescription, $joinVariable, null);
if ($subCondition instanceof FalseCondition) {
// empty parts in a disjunction can be ignored
} elseif ($subCondition instanceof TrueCondition) {
return $this->compoundConditionBuilder->buildTrueCondition($joinVariable, $orderByProperty);
} elseif ($subCondition instanceof WhereCondition) {
$hasSafeSubconditions = $hasSafeSubconditions || $subCondition->isSafe();
$subConditionElements->unionCondition .= ($subConditionElements->unionCondition ? ' UNION ' : '') . "{\n" . $subCondition->condition . "}";
} elseif ($subCondition instanceof FilterCondition) {
$subConditionElements->filter .= ($subConditionElements->filter ? ' || ' : '') . $subCondition->filter;
} elseif ($subCondition instanceof SingletonCondition) {
$hasSafeSubconditions = $hasSafeSubconditions || $subCondition->isSafe();
$matchElement = $subCondition->matchElement;
if ($matchElement instanceof ExpElement) {
$matchElementName = TurtleSerializer::getTurtleNameForExpElement($matchElement);
} else {
$matchElementName = $matchElement;
}
if ($matchElement instanceof ExpNsResource) {
$namespaces[$matchElement->getNamespaceId()] = $matchElement->getNamespace();
}
if ($subCondition->condition === '') {
$subConditionElements->filter .= ($subConditionElements->filter ? ' || ' : '') . "?{$joinVariable} = {$matchElementName}";
} else {
$subConditionElements->unionCondition .= ($subConditionElements->unionCondition ? ' UNION ' : '') . "{\n" . $subCondition->condition . " FILTER( ?{$joinVariable} = {$matchElementName} ) }";
}
}
$namespaces = array_merge($namespaces, $subCondition->namespaces);
$weakConditions = array_merge($weakConditions, $subCondition->weakConditions);
}
$subConditionElements->namespaces = $namespaces;
$subConditionElements->weakConditions = $weakConditions;
$subConditionElements->hasSafeSubconditions = $hasSafeSubconditions;
return $subConditionElements;
}
/**
* Create an Condition from a ThingDescription
*
* @param ThingDescription $description
* @param string $joinVariable
* @param DIProperty|null $orderByProperty
*
* @return Condition
*/
public function buildCondition(Description $description, $joinVariable, $orderByProperty = null)
{
return $this->compoundConditionBuilder->buildTrueCondition($joinVariable, $orderByProperty);
}