SemanticMediaWiki/includes/dataitems/SMW_DI_Container.php

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<?php
class SMWContainerSemanticData extends SMWSemanticData {

        public static function makeAnonymousContainer( $noDuplicates = true ) {
                $subject = new SMWDIWikiPage( 'SMWInternalObject', NS_SPECIAL, '' );
                return new SMWContainerSemanticData( $subject, $noDuplicates );
        }

        public function __sleep() {
                return array( 'mSubject', 'mProperties', 'mPropVals',
                        'mHasVisibleProps', 'mHasVisibleSpecs', 'mNoDuplicates' );
        }

        public function hasAnonymousSubject() {
                if ( $this->mSubject->getNamespace() == NS_SPECIAL &&
                     $this->mSubject->getDBkey() == 'SMWInternalObject' &&
                     $this->mSubject->getInterwiki() === '' ) {
                        return true;
                } else {
                        return false;
                }
        }

        public function getSubject() {
                if ( $this->hasAnonymousSubject() ) {
                        throw new SMWDataItemException("Trying to get the subject of a container data item that has not been given any. This container can only be used as a search pattern.");
                } else {
                        return $this->mSubject;
                }
        }

        public function copyDataFrom( SMWSemanticData $semanticData ) {
                $this->mSubject = $semanticData->getSubject();
                $this->mProperties = $semanticData->getProperties();
                $this->mPropVals = array();
                foreach ( $this->mProperties as $property ) {
                        $this->mPropVals[$property->getKey()] = $semanticData->getPropertyValues( $property );
                }
                $this->mHasVisibleProps = $semanticData->hasVisibleProperties();
                $this->mHasVisibleSpecs = $semanticData->hasVisibleSpecialProperties();
                $this->mNoDuplicates = $semanticData->mNoDuplicates;
        }

}

class SMWDIContainer extends SMWDataItem {

        protected $m_semanticData;

        public function __construct( SMWContainerSemanticData $semanticData ) {
                $this->m_semanticData = $semanticData;
        }

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

        public function getSemanticData() {
                return $this->m_semanticData;
        }

        public function getSortKey() {
                return '';
        }

        public function getSerialization() {
                return serialize( $this->m_semanticData );
        }

        public function getHash() {
                return $this->m_semanticData->getHash();
        }

        public static function doUnserialize( $serialization ) {
                $data = unserialize( $serialization );
                if ( !( $data instanceof SMWContainerSemanticData ) ) {
                        throw new SMWDataItemException( "Could not unserialize SMWDIContainer from the given string." );
                }
                return new SMWDIContainer( $data );
        }

}

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