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<?php
namespace SMW\Query\Language;
use Exception;
use SMW\DataValueFactory;
use SMW\DIWikiPage;
use SMW\Localizer;
/**
* Description of a single class as given by a wiki category, or of a
* disjunction of such classes. Corresponds to (disjunctions of) atomic classes
* in OWL and to (unions of) classes in RDF.
*
* @license GNU GPL v2+
* @since 1.6
*
* @author Markus Krötzsch
*/
class ClassDescription extends Description {
/**
* @var array of DIWikiPage
*/
protected $m_diWikiPages;
/**
* @var integer|null
*/
protected $hierarchyDepth;
/**
* Constructor.
*
* @param mixed $content DIWikiPage or array of DIWikiPage
*
* @throws Exception
*/
public function __construct( $content ) {
if ( $content instanceof DIWikiPage ) {
$this->m_diWikiPages = [ $content ];
} elseif ( is_array( $content ) ) {
$this->m_diWikiPages = $content;
} else {
throw new Exception( "ClassDescription::__construct(): parameter must be an DIWikiPage object or an array of such objects." );
}
}
/**
* @since 3.0
*
* @param integer $hierarchyDepth
*/
public function setHierarchyDepth( $hierarchyDepth ) {
if ( $hierarchyDepth > $GLOBALS['smwgQSubcategoryDepth'] ) {
$hierarchyDepth = $GLOBALS['smwgQSubcategoryDepth'];
}
$this->hierarchyDepth = $hierarchyDepth;
}
/**
* @since 3.0
*
* @return integer|null
*/
public function getHierarchyDepth() {
return $this->hierarchyDepth;
}
/**
* @since 3.0
*
* @param ClassDescription $description
*
* @return boolean
*/
public function isMergableDescription( ClassDescription $description ) {
if ( isset( $this->isNegation ) && isset( $description->isNegation ) ) {
return true;
}
if ( !isset( $this->isNegation ) && !isset( $description->isNegation ) ) {
return true;
}
return false;
}
/**
* @since 3.0
*
* @param DIWikiPage $dataItem
*/
public function addClass( DIWikiPage $dataItem ) {
$this->m_diWikiPages[] = $dataItem;
}
/**
* @param ClassDescription $description
*/
public function addDescription( ClassDescription $description ) {
$this->m_diWikiPages = array_merge( $this->m_diWikiPages, $description->getCategories() );
}
/**
* @see Description::getFingerprint
* @since 2.5
*
* @return string
*/
public function getFingerprint() {
$hash = [];
foreach ( $this->m_diWikiPages as $subject ) {
$hash[$subject->getHash()] = true;
}
ksort( $hash );
$extra = ( isset( $this->isNegation ) ? '|' . $this->isNegation : '' );
return 'Cl:' . md5( implode( '|', array_keys( $hash ) ) . $this->hierarchyDepth . $extra );
}
/**
* @return array of DIWikiPage
*/
public function getCategories() {
return $this->m_diWikiPages;
}
public function getQueryString( $asValue = false ) {
$first = true;
$namespaceText = Localizer::getInstance()->getNamespaceTextById( NS_CATEGORY );
foreach ( $this->m_diWikiPages as $wikiPage ) {
$wikiValue = DataValueFactory::getInstance()->newDataValueByItem( $wikiPage, null );
if ( $first ) {
$result = '[[' . $namespaceText . ':' . ( isset( $this->isNegation ) ? '!' : '' ) . $wikiValue->getText();
$first = false;
} else {
$result .= '||' . ( isset( $this->isNegation ) ? '!' : '' ) . $wikiValue->getText();
}
}
if ( $this->hierarchyDepth !== null ) {
$result .= '|+depth=' . $this->hierarchyDepth;
}
$result .= ']]';
if ( $asValue ) {
return ' <q>' . $result . '</q> ';
}
return $result;
}
public function isSingleton() {
return false;
}
public function getSize() {
if ( $GLOBALS['smwgQSubcategoryDepth'] > 0 ) {
return 1; // disj. of cats should not cause much effort if we compute cat-hierarchies anyway!
}
return count( $this->m_diWikiPages );
}
public function getQueryFeatures() {
if ( count( $this->m_diWikiPages ) > 1 ) {
return SMW_CATEGORY_QUERY | SMW_DISJUNCTION_QUERY;
}
return SMW_CATEGORY_QUERY;
}
public function prune( &$maxsize, &$maxdepth, &$log ) {
if ( $maxsize >= $this->getSize() ) {
$maxsize = $maxsize - $this->getSize();
return $this;
} elseif ( $maxsize <= 0 ) {
$log[] = $this->getQueryString();
$result = new ThingDescription();
} else {
$result = new ClassDescription( array_slice( $this->m_diWikiPages, 0, $maxsize ) );
$rest = new ClassDescription( array_slice( $this->m_diWikiPages, $maxsize ) );
$result->setHierarchyDepth(
$this->getHierarchyDepth()
);
$log[] = $rest->getQueryString();
$maxsize = 0;
}
$result->setPrintRequests( $this->getPrintRequests() );
return $result;
}
}
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