/**
* @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 = $this->querySegmentListBuilder->getStore()->getObjectIds()->getSMWPageID($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->querySegmentListBuilder->getStore()->findPropertyTableID(new DIProperty('_INST'));
$query->joinfield = "{$query->alias}.s_id";
$query->components[$cqid] = "{$query->alias}.o_id";
$this->querySegmentListBuilder->addQuerySegment($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::TABLE_NAME;
$query->joinfield = "{$query->alias}.smw_id";
$query->where = "{$query->alias}.smw_namespace=" . $this->querySegmentListBuilder->getStore()->getConnection('mw.db')->addQuotes($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->querySegmentListBuilder->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), $this->querySegmentListBuilder->getStore()->getConnection(DB_SLAVE));
}
if ($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})";
}
}
/**
* @since 2.2
*
* @param Description $description
*
* @return QuerySegment
*/
public function interpretDescription(Description $description)
{
$query = new QuerySegment();
$conceptId = $this->querySegmentListBuilder->getStore()->getObjectIds()->getSMWPageID($description->getConcept()->getDBkey(), SMW_NS_CONCEPT, '', '');
$hash = 'concept-' . $conceptId;
$this->querySegmentListBuilder->getCircularReferenceGuard()->mark($hash);
if ($this->querySegmentListBuilder->getCircularReferenceGuard()->isCircularByRecursionFor($hash)) {
$this->querySegmentListBuilder->addError(wfMessage('smw-query-condition-circular', $description->getQueryString())->text());
return $query;
}
$db = $this->querySegmentListBuilder->getStore()->getConnection('mw.db.queryengine');
$row = $this->getConceptForId($db, $conceptId);
// No description found, concept does not exist.
if ($row === false) {
$this->querySegmentListBuilder->getCircularReferenceGuard()->unmark('concept-' . $conceptId);
// keep the above query object, it yields an empty result
// TODO: announce an error here? (maybe not, since the query processor can check for
// non-existing concept pages which is probably the main reason for finding nothing here)
return $query;
}
global $smwgQConceptCaching, $smwgQMaxSize, $smwgQMaxDepth, $smwgQFeatures, $smwgQConceptCacheLifetime;
$may_be_computed = $smwgQConceptCaching == CONCEPT_CACHE_NONE || $smwgQConceptCaching == CONCEPT_CACHE_HARD && ~(~($row->concept_features + 0) | $smwgQFeatures) == 0 && $smwgQMaxSize >= $row->concept_size && $smwgQMaxDepth >= $row->concept_depth;
if ($row->cache_date && ($row->cache_date > strtotime("now") - $smwgQConceptCacheLifetime * 60 || !$may_be_computed)) {
// Cached concept, use cache unless it is dead and can be revived.
$query->joinTable = SMWSQLStore3::CONCEPT_CACHE_TABLE;
$query->joinfield = "{$query->alias}.s_id";
$query->where = "{$query->alias}.o_id=" . $db->addQuotes($conceptId);
} elseif ($row->concept_txt) {
// Parse description and process it recursively.
if ($may_be_computed) {
$qid = $this->querySegmentListBuilder->getQuerySegmentFrom($this->getConceptQueryDescriptionFrom($row->concept_txt));
if ($qid != -1) {
$query = $this->querySegmentListBuilder->findQuerySegment($qid);
} else {
// somehow the concept query is no longer valid; maybe some syntax changed (upgrade) or global settings were modified since storing it
$this->querySegmentListBuilder->addError(wfMessage('smw_emptysubquery')->text());
// not the right message, but this case is very rare; let us not make detailed messages for this
}
} else {
$this->querySegmentListBuilder->addError(wfMessage('smw_concept_cache_miss', $description->getConcept()->getTitle()->getText())->text());
}
}
// else: no cache, no description (this may happen); treat like empty concept
$this->querySegmentListBuilder->getCircularReferenceGuard()->unmark($hash);
return $query;
}
/**
* 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 = $this->querySegmentListBuilder->getStore()->getObjectIds()->getSMWPageID($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::TABLE_NAME;
$query->joinfield = "{$query->alias}.smw_id";
$value = $description->getDataItem()->getSortKey();
$comparator = $this->comparatorMapper->mapComparator($description, $value);
$query->where = "{$query->alias}.smw_sortkey{$comparator}" . $this->querySegmentListBuilder->getStore()->getConnection('mw.db')->addQuotes($value);
}
return $query;
}
private function addFulltextSearchCondition($query, $comparator, &$value)
{
// Remove remaining ~ from the search string
$value = str_replace('~', '', $value);
$valueMatchConditionBuilder = $this->fulltextSearchTableFactory->newValueMatchConditionBuilderByType($this->querySegmentListBuilder->getStore());
if (!$valueMatchConditionBuilder->isEnabled() || !$valueMatchConditionBuilder->hasMinTokenLength($value)) {
return false;
}
$query->joinTable = $valueMatchConditionBuilder->getTableName();
$query->joinfield = "{$query->alias}.s_id";
$query->components = array();
$query->where = $valueMatchConditionBuilder->getWhereCondition(new ValueDescription(new DIBlob($value), null, $comparator), $query->alias);
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->querySegmentListBuilder->getStore()->getConnection('mw.db')->selectRow('smw_fpt_conc', array('concept_txt', 'concept_features', 'concept_size', 'concept_depth', 'cache_date'), array('s_id' => $id), __METHOD__);
}
