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<?php
/**
* @ingroup SMWDataItems
*/
use SMW\Exception\DataItemException;
/**
* This class implements Boolean data items.
*
* @since 1.6
*
* @author Markus Krötzsch
* @ingroup SMWDataItems
*/
class SMWDIBoolean extends SMWDataItem {
/**
* Internal value.
* @var bool
*/
protected $m_boolean;
public function __construct( $boolean ) {
if ( !is_bool( $boolean ) ) {
throw new DataItemException( "Initialization value '$boolean' is not a boolean." );
}
$this->m_boolean = ( $boolean == true );
}
public function getDIType() {
return SMWDataItem::TYPE_BOOLEAN;
}
public function getBoolean() {
return $this->m_boolean;
}
public function getSerialization() {
return $this->m_boolean ? 't' : 'f';
}
public function getSortKey() {
return $this->m_boolean ? 1 : 0;
}
/**
* Create a data item from the provided serialization string and type
* ID.
* @return SMWDIBoolean
*/
public static function doUnserialize( $serialization ) {
if ( $serialization == 't' ) {
return new SMWDIBoolean( true );
} elseif ( $serialization == 'f' ) {
return new SMWDIBoolean( false );
} else {
throw new DataItemException( "Boolean data item unserialised from illegal value '$serialization'" );
}
}
public function equals( SMWDataItem $di ) {
if ( $di->getDIType() !== SMWDataItem::TYPE_BOOLEAN ) {
return false;
}
return $di->getBoolean() === $this->m_boolean;
}
}
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