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<?php
namespace SMW\SQLStore;
use SMW\ApplicationFactory;
use SMW\DIProperty;
use SMWDataItem as DataItem;
/**
* @license GNU GPL v2+
* @since 2.4
*
* @author mwjames
*/
class PropertyTableIdReferenceFinder {
/**
* @var SQLStore
*/
private $store;
/**
* @var Database
*/
private $connection;
/**
* @var NamespaceExaminer
*/
private $namespaceExaminer;
/**
* @var boolean
*/
private $isCapitalLinks = true;
/**
* @since 2.4
*
* @param SQLStore $store
*/
public function __construct( SQLStore $store ) {
$this->store = $store;
$this->connection = $this->store->getConnection( 'mw.db' );
$this->namespaceExaminer = ApplicationFactory::getInstance()->getNamespaceExaminer();
}
/**
* @note If $wgCapitalLinks is set false then it will avoid forcing the first
* letter of page titles (including included pages, images and categories)
* to capitals
*
* @since 2.4
*
* @param booelan $isCapitalLinks
*/
public function isCapitalLinks( $isCapitalLinks ) {
$this->isCapitalLinks = $isCapitalLinks;
}
/**
* @since 2.4
*
* @param DIProperty $property
*
* @return DataItem|false
*/
public function tryToFindAtLeastOneReferenceForProperty( DIProperty $property ) {
$dataItem = $property->getDiWikiPage();
$sid = $this->store->getObjectIds()->getSMWPageID(
$dataItem->getDBkey(),
$dataItem->getNamespace(),
$dataItem->getInterwiki(),
''
);
// Lets see if we have some lower/upper case matching for
// when wgCapitalLinks setting was involved
if ( !$this->isCapitalLinks && $sid == 0 ) {
$sid = $this->store->getObjectIds()->getSMWPageID(
lcfirst( $dataItem->getDBkey() ),
$dataItem->getNamespace(),
$dataItem->getInterwiki(),
''
);
}
return $this->findAtLeastOneActiveReferenceById( $sid );
}
/**
* @since 3.0
*
* @param integer $id
*
* @return boolean
*/
public function hasResidualPropertyTableReference( $id ) {
if ( $id == SQLStore::FIXED_PROPERTY_ID_UPPERBOUND ) {
return true;
}
return (bool)$this->findAtLeastOneActiveReferenceById( $id, false );
}
/**
* @since 2.4
*
* @param integer $id
*
* @return boolean
*/
public function hasResidualReferenceForId( $id ) {
if ( $id == SQLStore::FIXED_PROPERTY_ID_UPPERBOUND ) {
return true;
}
return (bool)$this->findAtLeastOneActiveReferenceById( $id );
}
/**
* @since 2.5
*
* @param integer $id
*
* @return array
*/
public function searchAllTablesToFindAtLeastOneReferenceById( $id ) {
$references = [];
foreach ( $this->store->getPropertyTables() as $proptable ) {
$reference = false;
if ( ( $reference = $this->findReferenceByPropertyTable( $proptable, $id ) ) !== false ) {
$references[$proptable->getName()] = $reference;
}
}
if ( ( $reference = $this->findQueryLinksTableReferenceById( $id ) ) !== false ) {
$references[SQLStore::QUERY_LINKS_TABLE] = $reference;
}
return $references;
}
/**
* @since 2.4
*
* @param integer $id
* @param boolean $secondary_ref
*
* @return DataItem|false
*/
public function findAtLeastOneActiveReferenceById( $id, $secondary_ref = true ) {
$reference = false;
foreach ( $this->store->getPropertyTables() as $proptable ) {
if ( ( $reference = $this->findReferenceByPropertyTable( $proptable, $id ) ) !== false ) {
// If null is returned it means that a reference was found but no DI could
// be matched therefore is categorized as false positive
if ( isset( $reference->s_id ) ) {
$reference = $this->store->getObjectIds()->getDataItemById( $reference->s_id );
// If the reference is for some reason not part of a supported namespace,
// it is assumed to be invalid
if ( $reference !== null && !$this->namespaceExaminer->isSemanticEnabled( $reference->getNamespace() ) ) {
$reference = false;
}
}
}
if ( $reference instanceof DataItem ) {
return $reference;
}
}
if ( $secondary_ref && !isset( $reference->s_id ) ) {
$reference = $this->findQueryLinksTableReferenceById( $id );
}
if ( isset( $reference->s_id ) ) {
$reference = $this->store->getObjectIds()->getDataItemById( $reference->s_id );
}
if ( $reference === false || $reference === null ) {
return false;
}
return $reference;
}
private function findReferenceByPropertyTable( $proptable, $id ) {
$row = false;
if ( $proptable->usesIdSubject() ) {
$row = $this->connection->selectRow(
$proptable->getName(),
[ 's_id' ],
[ 's_id' => $id ],
__METHOD__
);
}
if ( $row !== false ) {
return $row;
}
$fields = $proptable->getFields( $this->store );
// Check whether an object reference exists or not
if ( isset( $fields['o_id'] ) ) {
// This next time someone ... I'm going to Alaska
$field = strpos( $proptable->getName(), 'redi' ) ? [ 's_title', 's_namespace' ] : [ 's_id' ];
$row = $this->connection->selectRow(
$proptable->getName(),
$field,
[ 'o_id' => $id ],
__METHOD__
);
if ( $row !== false && strpos( $proptable->getName(), 'redi' ) ) {
$row->s_id = $this->store->getObjectIds()->findRedirect( $row->s_title, $row->s_namespace );
}
}
// If the property table is not a fixed table (== assigns a whole
// table to a specific property with the p_id column being suppressed)
// then check for the p_id field
if ( $row === false && !$proptable->isFixedPropertyTable() ) {
$row = $this->connection->selectRow(
$proptable->getName(),
[ 's_id' ],
[ 'p_id' => $id ],
__METHOD__
);
}
return $row;
}
private function findQueryLinksTableReferenceById( $id ) {
// If the query table contains a reference then we keep the object (could
// be a subject, property, or printrequest) where in case the query is
// removed the object will also loose its reference
$row = $this->connection->selectRow(
SQLStore::QUERY_LINKS_TABLE,
[ 's_id' ],
[ 'o_id' => $id ],
__METHOD__
);
return $row;
}
}
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