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<?php
namespace SMW\SQLStore\EntityStore;
use SMW\DIProperty;
use SMW\DIWikiPage;
use SMW\IteratorFactory;
use SMW\SQLStore\SQLStore;
/**
* @private
*
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class SubobjectListFinder {
/**
* @var SQLStore
*/
private $store;
/**
* @var IteratorFactory
*/
private $iteratorFactory;
/**
* @var DIWikiPage
*/
private $subject;
/**
* @var []
*/
private $mappingIterator = [];
/**
* @var []
*/
private $skipConditions = [];
/**
* @since 2.5
*
* @param SQLStore $store
* @param IteratorFactory $iteratorFactory
*/
public function __construct( SQLStore $store, IteratorFactory $iteratorFactory ) {
$this->store = $store;
$this->iteratorFactory = $iteratorFactory;
}
/**
* @since 3.0
*
* @param DIWikiPage $subject
*
* @return MappingIterator
*/
public function find( DIWikiPage $subject ) {
$key = $subject->getHash() . ':' . $subject->getId();
if ( !isset( $this->mappingIterator[$key] ) ) {
$this->mappingIterator[$key] = $this->newMappingIterator( $subject );
}
return $this->mappingIterator[$key];
}
/**
* Fetch all subobjects for a given subject using a lazy-mapping iterator
* in order to only resolve one subobject per iteration step.
*
* @since 2.5
*
* @param DIWikiPage $subject
*
* @return MappingIterator
*/
private function newMappingIterator( DIWikiPage $subject ) {
$callback = function( $row ) use ( $subject ) {
// #1955
if ( $subject->getNamespace() === SMW_NS_PROPERTY ) {
$property = new DIProperty( $subject->getDBkey() );
$subobject = $property->getCanonicalDiWikiPage( $row->smw_subobject );
} else {
$subobject = new DIWikiPage(
$subject->getDBkey(),
$subject->getNamespace(),
$subject->getInterwiki(),
$row->smw_subobject
);
}
$subobject->setSortKey( $row->smw_sortkey );
$subobject->setId( $row->smw_id );
return $subobject;
};
return $this->iteratorFactory->newMappingIterator(
$this->newResultIterator( $subject ),
$callback
);
}
private function newResultIterator( DIWikiPage $subject ) {
$connection = $this->store->getConnection( 'mw.db' );
$key = $subject->getDBkey();
// #1955 Ensure to match a possible predefined property
// (Modification date -> _MDAT)
if ( $subject->getNamespace() === SMW_NS_PROPERTY ) {
$key = DIProperty::newFromUserLabel( $key )->getKey();
}
$conditions = [
'smw_title=' . $connection->addQuotes( $key ),
'smw_namespace=' . $connection->addQuotes( $subject->getNamespace() ),
'smw_iw=' . $connection->addQuotes( $subject->getInterwiki() ),
'smw_subobject!=' . $connection->addQuotes( '' )
];
foreach ( $this->skipConditions as $skipOn ) {
$conditions[] = 'smw_subobject!=' . $connection->addQuotes( $skipOn );
}
$res = $connection->select(
$connection->tablename( SQLStore::ID_TABLE ),
[
'smw_id',
'smw_subobject',
'smw_sortkey'
],
implode( ' AND ' , $conditions ),
__METHOD__
);
return $this->iteratorFactory->newResultIterator( $res );
}
}
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