SemanticMediaWiki/includes/dataitems/SMW_DataItem.php

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<?php
class SMWDataItemException extends MWException {
}

abstract class SMWDataItem {

        const TYPE_NOTYPE    = 0;
        const TYPE_NUMBER    = 1;
        const TYPE_STRING    = 2;
        const TYPE_BLOB      = 3;
        const TYPE_BOOLEAN   = 4;
        const TYPE_URI       = 5;
        const TYPE_TIME      = 6;
        const TYPE_GEO       = 7;
        const TYPE_CONTAINER = 8;
        const TYPE_WIKIPAGE  = 9;
        const TYPE_CONCEPT   = 10;
        const TYPE_PROPERTY  = 11;
        const TYPE_ERROR     = 12;

        abstract public function getDIType();

        abstract public function getSortKey();

        public function getSortKeyDataItem() {
                $sortkey = $this->getSortKey();
                if ( is_numeric( $sortkey ) ) {
                        return new SMWDINumber( $sortkey );
                } else {
                        return new SMWDIBlob( $sortkey );
                }
        }

        abstract public function getSerialization();

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

        public static function newFromSerialization( $diType, $serialization ) {
                $diClass = self::getDataItemClassNameForId( $diType );
                return call_user_func( array( $diClass, 'doUnserialize' ), $serialization );
        }

        public static function getDataItemClassNameForId( $diType ) {
                switch ( $diType ) {
                        case self::TYPE_NUMBER:    return 'SMWDINumber';
                        case self::TYPE_STRING:    return 'SMWDIString';
                        case self::TYPE_BLOB:      return 'SMWDIBlob';
                        case self::TYPE_BOOLEAN:   return 'SMWDIBoolean';
                        case self::TYPE_URI:       return 'SMWDIUri';
                        case self::TYPE_TIME:      return 'SMWDITime';
                        case self::TYPE_GEO:       return 'SMWDIGeoCoord';
                        case self::TYPE_CONTAINER: return 'SMWDIContainer';
                        case self::TYPE_WIKIPAGE:  return 'SMWDIWikiPage';
                        case self::TYPE_CONCEPT:   return 'SMWDIConcept';
                        case self::TYPE_PROPERTY:  return 'SMWDIProperty';
                        case self::TYPE_ERROR:     return 'SMWDIError';
                        case self::TYPE_NOTYPE: default:
                                throw new InvalidArgumentException( "The value \"$diType\" is not a valid dataitem ID." );
                }
        }

}

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