ApiFormatFeedWrapper.php

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<?php
class ApiFormatFeedWrapper extends ApiFormatBase {

    public function __construct( ApiMain $main ) {
        parent::__construct( $main, 'feed' );
    }

    public static function setResult( $result, $feed, $feedItems ) {
        // Store output in the Result data.
        // This way we can check during execution if any error has occurred
        // Disable size checking for this because we can't continue
        // cleanly; size checking would cause more problems than it'd
        // solve
        $result->addValue( null, '_feed', $feed, ApiResult::NO_SIZE_CHECK );
        $result->addValue( null, '_feeditems', $feedItems, ApiResult::NO_SIZE_CHECK );
    }

    public function getMimeType() {
        return null;
    }

    public function getNeedsRawData() {
        return true;
    }

    public function canPrintErrors() {
        return false;
    }

    public function execute() {
        $data = $this->getResultData();
        if ( isset( $data['_feed'] ) && isset( $data['_feeditems'] ) ) {
            $feed = $data['_feed'];
            $items = $data['_feeditems'];

            $feed->outHeader();
            foreach ( $items as & $item ) {
                $feed->outItem( $item );
            }
            $feed->outFooter();
        } else {
            // Error has occurred, print something useful
            ApiBase::dieDebug( __METHOD__, 'Invalid feed class/item' );
        }
    }
}