/**
* @since 2.2
*
* @param Description $description
*
* @return QuerySegment
*/
public function interpretDescription(Description $description)
{
$query = new QuerySegment();
$cqid = QuerySegment::$qnum;
$cquery = new QuerySegment();
$cquery->type = QuerySegment::Q_CLASS_HIERARCHY;
$cquery->joinfield = array();
foreach ($description->getCategories() as $category) {
$categoryId = $this->queryBuilder->getStore()->getObjectIds()->getSMWPageID($category->getDBkey(), NS_CATEGORY, $category->getInterwiki(), '');
if ($categoryId != 0) {
$cquery->joinfield[] = $categoryId;
}
}
if (count($cquery->joinfield) == 0) {
// Empty result.
$query->type = QuerySegment::Q_VALUE;
$query->joinTable = '';
$query->joinfield = '';
} else {
// Instance query with disjunction of classes (categories)
$query->joinTable = $this->queryBuilder->getStore()->findPropertyTableID(new DIProperty('_INST'));
$query->joinfield = "{$query->alias}.s_id";
$query->components[$cqid] = "{$query->alias}.o_id";
$this->queryBuilder->addQuerySegmentForId($cqid, $cquery);
}
return $query;
}
/**
* TODO: One instance of the SMW IDs table on s_id always suffices (swm_id is KEY)! Doable in execution ... (PERFORMANCE)
*
* @since 2.2
*
* @param Description $description
*
* @return QuerySegment
*/
public function interpretDescription(Description $description)
{
$query = new QuerySegment();
$query->joinTable = SMWSql3SmwIds::tableName;
$query->joinfield = "{$query->alias}.smw_id";
$query->where = "{$query->alias}.smw_namespace=" . $this->queryBuilder->getStore()->getConnection('mw.db')->addQuotes($description->getNamespace());
return $query;
}
/**
* Given an Description that is just a conjunction or disjunction of
* ValueDescription objects, create and return a plain WHERE condition
* string for it.
*
* @param $query
* @param ValueDescription $description
* @param DataItemHandler $diHandler for that table
* @param string $operator SQL operator "AND" or "OR"
*/
private function mapValueDescription($query, ValueDescription $description, DataItemHandler $diHandler, $operator)
{
$where = '';
$dataItem = $description->getDataItem();
$db = $this->queryBuilder->getStore()->getConnection('mw.db');
// TODO Better get the handle from the property type
// Some comparators (e.g. LIKE) could use DI values of
// a different type; we care about the property table, not
// about the value
// Do not support smw_id joined data for now.
$indexField = $diHandler->getIndexField();
//Hack to get to the field used as index
$keys = $diHandler->getWhereConds($dataItem);
$value = $keys[$indexField];
// See if the getSQLCondition method exists and call it if this is the case.
// Invoked by SMAreaValueDescription, SMGeoCoordsValueDescription
if (method_exists($description, 'getSQLCondition')) {
$fields = $diHandler->getTableFields();
$where = $description->getSQLCondition($query->alias, array_keys($fields), $this->queryBuilder->getStore()->getConnection(DB_SLAVE));
}
if ($where == '') {
$comparator = $this->comparatorMapper->mapComparator($description, $value);
$where = "{$query->alias}.{$indexField}{$comparator}" . $db->addQuotes($value);
}
if ($where !== '') {
if ($query->where && substr($query->where, -1) != '(') {
$query->where .= " {$operator} ";
}
$query->where .= "({$where})";
}
}
/**
* Only type '_wpg' objects can appear on query level (essentially as nominal classes)
*
* @since 2.2
*
* @param Description $description
*
* @return QuerySegment
*/
public function interpretDescription(Description $description)
{
$query = new QuerySegment();
if (!$description->getDataItem() instanceof DIWikiPage) {
return $query;
}
if ($description->getComparator() === SMW_CMP_EQ) {
$query->type = QuerySegment::Q_VALUE;
$oid = $this->queryBuilder->getStore()->getObjectIds()->getSMWPageID($description->getDataItem()->getDBkey(), $description->getDataItem()->getNamespace(), $description->getDataItem()->getInterwiki(), $description->getDataItem()->getSubobjectName());
$query->joinfield = array($oid);
} else {
// Join with SMW IDs table needed for other comparators (apply to title string).
$query->joinTable = SMWSql3SmwIds::tableName;
$query->joinfield = "{$query->alias}.smw_id";
$value = $description->getDataItem()->getSortKey();
$comparator = $this->comparatorMapper->mapComparator($description, $value);
$query->where = "{$query->alias}.smw_sortkey{$comparator}" . $this->queryBuilder->getStore()->getConnection('mw.db')->addQuotes($value);
}
return $query;
}
/**
* We bypass the storage interface here (which is legal as we control it,
* and safe if we are careful with changes ...)
*
* This should be faster, but we must implement the unescaping that concepts
* do on getWikiValue
*/
private function getConceptForId($id)
{
return $this->queryBuilder->getStore()->getConnection('mw.db')->selectRow('smw_fpt_conc', array('concept_txt', 'concept_features', 'concept_size', 'concept_depth', 'cache_date'), array('s_id' => $id), __METHOD__);
}
