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<?php
namespace SMW\Query\Language;
/**
* A dummy description that describes any object. Corresponds to
* owl:thing, the class of all abstract objects. Note that it is
* not used for datavalues of attributes in order to support type
* hinting in the API: descriptions of data are always
* ValueDescription objects.
*
* @license GNU GPL v2+
* @since 1.6
*
* @author Markus Krötzsch
*/
class ThingDescription extends Description {
public function getQueryString( $asValue = false ) {
return $asValue ? ( isset( $this->isNegation ) ? '!' : '' ) . '+' : '';
}
public function isSingleton() {
return false;
}
public function getSize() {
return 0; // no real condition, no size or depth
}
public function prune( &$maxsize, &$maxdepth, &$log ) {
return $this;
}
/**
* @see Description::getFingerprint
* @since 2.5
*
* @return string
*/
public function getFingerprint() {
// Avoid a simple 0 which may interfere with an associative array
// when compounding hash strings from different descriptions
return 'T:' . md5( 0 ) . ( isset( $this->isNegation ) ? '!' : '' );
}
}
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