SiteList.php

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<?php

class SiteList extends GenericArrayObject {

        protected $byInternalId = array();

        protected $byGlobalId = array();

        public function getObjectType() {
                return 'Site';
        }

        protected function preSetElement( $index, $site ) {
                if ( $this->hasSite( $site->getGlobalId() ) ) {
                        $this->removeSite( $site->getGlobalId() );
                }

                $this->byGlobalId[$site->getGlobalId()] = $index;
                $this->byInternalId[$site->getInternalId()] = $index;

                return true;
        }

        public function offsetUnset( $index ) {
                if ( $this->offsetExists( $index ) ) {
                        $site = $this->offsetGet( $index );

                        unset( $this->byGlobalId[$site->getGlobalId()] );
                        unset( $this->byInternalId[$site->getInternalId()] );
                }

                parent::offsetUnset( $index );
        }

        public function getGlobalIdentifiers() {
                return array_keys( $this->byGlobalId );
        }

        public function hasSite( $globalSiteId ) {
                return array_key_exists( $globalSiteId, $this->byGlobalId );
        }

        public function getSite( $globalSiteId ) {
                return $this->offsetGet( $this->byGlobalId[$globalSiteId] );
        }

        public function removeSite( $globalSiteId ) {
                $this->offsetUnset( $this->byGlobalId[$globalSiteId] );
        }

        public function isEmpty() {
                return $this->byGlobalId === array();
        }

        public function hasInternalId( $id ) {
                return array_key_exists( $id, $this->byInternalId );
        }

        public function getSiteByInternalId( $id ) {
                return $this->offsetGet( $this->byInternalId[$id] );
        }

        public function removeSiteByInternalId( $id ) {
                $this->offsetUnset( $this->byInternalId[$id] );
        }

        public function setSite( Site $site ) {
                $this[] = $site;
        }

        public function getGroup( $groupName ) {
                $group = new self();

                foreach ( $this as $site ) {
                        if ( $site->getGroup() === $groupName ) {
                                $group[] = $site;
                        }
                }

                return $group;
        }

        const SERIAL_VERSION_ID = '2013-02-07';

        public static function getSerialVersionId() {
                return self::SERIAL_VERSION_ID . '+Site:' . Site::SERIAL_VERSION_ID;
        }

        protected function getSerializationData() {
                //NOTE: When changing the structure, either implement unserialize() to handle the
                //      old structure too, or update SERIAL_VERSION_ID to kill any caches.
                return array_merge(
                        parent::getSerializationData(),
                        array(
                                'internalIds' => $this->byInternalId,
                                'globalIds' => $this->byGlobalId,
                        )
                );
        }

        public function unserialize( $serialization ) {
                $serializationData = parent::unserialize( $serialization );

                $this->byInternalId = $serializationData['internalIds'];
                $this->byGlobalId = $serializationData['globalIds'];

                return $serializationData;
        }

}

class SiteArray extends SiteList {}