SemanticMediaWiki/includes/dataitems/SMW_DI_WikiPage.php

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<?php
class SMWDIWikiPage extends SMWDataItem {

        protected $m_dbkey;
        protected $m_namespace;
        protected $m_interwiki;
        protected $m_subobjectname;

        public function __construct( $dbkey, $namespace, $interwiki, $subobjectname = '' ) {
                if ( !is_numeric( $namespace ) ) {
                        throw new SMWDataItemException( "Given namespace '$namespace' is not an integer." );
                }
                
                $this->m_dbkey = $dbkey;
                $this->m_namespace = (int)$namespace; // really make this an integer
                $this->m_interwiki = $interwiki;
                $this->m_subobjectname = $subobjectname;
        }

        public function getDIType() {
                return SMWDataItem::TYPE_WIKIPAGE;
        }

        public function getDBkey() {
                return $this->m_dbkey;
        }

        public function getNamespace() {
                return $this->m_namespace;
        }

        public function getInterwiki() {
                return $this->m_interwiki;
        }

        public function getSubobjectName() {
                return $this->m_subobjectname;
        }

        public function getSortKey() {
                return $this->m_dbkey;
        }

        public function getTitle() {
                if ( $this->m_interwiki === '' ) {
                        return Title::makeTitleSafe( $this->m_namespace, $this->m_dbkey, $this->m_subobjectname );
                } else { // TODO inefficient; incomplete for fragments (see above commment)
                        $datavalue = new SMWWikiPageValue( '_wpg' );
                        $datavalue->setDataItem( $this );
                        return Title::newFromText( $datavalue->getPrefixedText() );
                }
        }

        public function getSerialization() {
                if ( $this->m_subobjectname === '' ) {
                        return strval( $this->m_dbkey . '#' . strval( $this->m_namespace ) . '#' . $this->m_interwiki );
                } else {
                        return strval( $this->m_dbkey . '#' . strval( $this->m_namespace ) . '#' . $this->m_interwiki . '#' . $this->m_subobjectname );
                }
        }

        public static function doUnserialize( $serialization ) {
                $parts = explode( '#', $serialization, 4 );
                if ( count( $parts ) == 3 ) {
                        return new SMWDIWikiPage( $parts[0], floatval( $parts[1] ), $parts[2] );
                } elseif ( count( $parts ) == 4 ) {
                        return new SMWDIWikiPage( $parts[0], floatval( $parts[1] ), $parts[2], $parts[3] );
                } else {
                        throw new SMWDataItemException( "Unserialization failed: the string \"$serialization\" was not understood." );
                } 
        }

        public static function newFromTitle( Title $title ) {
                return new SMWDIWikiPage( $title->getDBkey(), $title->getNamespace(),
                        $title->getInterwiki(), str_replace( ' ', '_', $title->getFragment() ) );
        }

}

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