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<?php
namespace SMW;
use SMWDataItem as DataItem;
/**
* @license GPL-2.0-or-later
* @since 3.1
*
* @author mwjames
*/
class DisplayTitleFinder {
/**
* @var Store
*/
private $store;
/**
* @var EntityCache
*/
private $entityCache;
/**
* @var bool
*/
private $canUse = true;
/**
* @since 3.1
*
* @param Store $store
* @param EntityCache $entityCache
*/
public function __construct( Store $store, EntityCache $entityCache ) {
$this->store = $store;
$this->entityCache = $entityCache;
}
/**
* @since 3.1
*
* @param bool $canUse
*/
public function getEntityCache() {
return $this->entityCache;
}
/**
* @since 3.1
*
* @param bool $canUse
*/
public function setCanUse( $canUse ) {
$this->canUse = (bool)$canUse;
}
/**
* @since 3.2
*
* @param SemanticData $semanticData
*/
public function prefetchFromSemanticData( SemanticData $semanticData ) {
if ( $this->canUse === false ) {
return;
}
$dataItems = [];
$dataItems[] = $semanticData->getSubject();
foreach ( $semanticData->getProperties() as $property ) {
$type = DataTypeRegistry::getInstance()->getDataItemByType(
$property->findPropertyValueType()
);
if ( $type !== DataItem::TYPE_WIKIPAGE ) {
continue;
}
$dataItems = array_merge(
$dataItems,
$semanticData->getPropertyValues( $property )
);
}
foreach ( $semanticData->getSubSemanticData() as $subSemanticData ) {
$dataItems[] = $subSemanticData->getSubject();
foreach ( $subSemanticData->getProperties() as $property ) {
$type = DataTypeRegistry::getInstance()->getDataItemByType(
$property->findPropertyValueType()
);
if ( $type !== DataItem::TYPE_WIKIPAGE ) {
continue;
}
$dataItems = array_merge(
$dataItems,
$subSemanticData->getPropertyValues( $property )
);
}
}
$this->prefetchFromList( $dataItems );
}
/**
* @since 3.1
*
* @param array $dataItems
*/
public function prefetchFromList( $dataItems ) {
if ( $this->canUse === false || !is_iterable( $dataItems ) ) {
return;
}
$unCachedList = [];
foreach ( $dataItems as $dataItem ) {
if ( !$dataItem instanceof DIWikiPage ) {
continue;
}
$key = $this->entityCache->makeKey( 'displaytitle', $dataItem->getHash() );
if ( $this->entityCache->fetch( $key ) !== false ) {
continue;
}
$unCachedList[$dataItem->getSha1()] = $dataItem;
if ( $dataItem->getSubobjectName() === '' ) {
continue;
}
// Fetch the base in case the subobject has no assignment
$dataItem = $dataItem->asBase();
$unCachedList[$dataItem->getSha1()] = $dataItem;
}
if ( $unCachedList === [] ) {
return;
}
try {
$displayTitleLookup = $this->store->service( 'DisplayTitleLookup' );
} catch ( \SMW\Services\Exception\ServiceNotFoundException $e ) {
return;
}
$prefetch = $displayTitleLookup->prefetchFromList(
$unCachedList
);
foreach ( $unCachedList as $sha1 => $dataItem ) {
// Can be NULL therefore use `array_key_exists` as well
if ( !isset( $prefetch[$sha1] ) && !array_key_exists( $sha1, $prefetch ) ) {
continue;
}
$prefetchTitle = $prefetch[$sha1];
// Nothing found, use the base!
if ( $prefetchTitle === null && $dataItem->getSubobjectName() !== '' ) {
$sha1 = $dataItem->asBase()->getSha1();
if ( !isset( $prefetch[$sha1] ) && !array_key_exists( $sha1, $prefetch ) ) {
continue;
}
$prefetchTitle = $prefetch[$sha1];
}
if ( $prefetchTitle === null ) {
$displayTitle = ' ';
} else {
$displayTitle = $prefetchTitle;
}
$key = $this->entityCache->makeKey( 'displaytitle', $dataItem->getHash() );
$this->entityCache->save( $key, $displayTitle, EntityCache::TTL_WEEK );
$this->entityCache->associate( $dataItem, $key );
}
}
/**
* @since 3.1
*
* @param DIWikiPage $subject
*
* @return string
*/
public function findDisplayTitle( DIWikiPage $subject ) {
if ( $this->canUse === false ) {
return '';
}
$base = $subject->asBase();
$key = $this->entityCache->makeKey( 'displaytitle', $subject->getHash() );
if ( ( $displayTitle = $this->entityCache->fetch( $key ) ) !== false && $displayTitle !== null ) {
return trim( $displayTitle );
}
$displayTitle = $this->findDisplayTitleFor( $subject );
$this->entityCache->save( $key, $displayTitle, EntityCache::TTL_WEEK );
// Connect to the base subject so that all keys can be flushed at
// the time the subject gets altered
$this->entityCache->associate( $base, $key );
return trim( $displayTitle );
}
private function findDisplayTitleFor( $subject ) {
$requestOptions = new RequestOptions();
$requestOptions->setCaller( __METHOD__ );
// Avoid issues in case of `false` or empty to store
// a space
$displayTitle = ' ';
$dataItems = $this->store->getPropertyValues(
$subject,
new DIProperty( '_DTITLE' ),
$requestOptions
);
if ( $dataItems !== null && $dataItems !== [] ) {
$displayTitle = end( $dataItems )->getString();
} elseif ( $subject->getSubobjectName() !== '' ) {
// Check whether the base subject has a DISPLAYTITLE
return $this->findDisplayTitleFor( $subject->asBase() );
}
return $displayTitle;
}
}