nextcloud/apps/dav/lib/CalDAV/Publishing/Xml/Publisher.php

<?php

namespace OCA\DAV\CalDAV\Publishing\Xml;

use OCA\DAV\CalDAV\Publishing\PublishPlugin as Plugin;
use Sabre\Xml\Writer;
use Sabre\Xml\XmlSerializable;

class Publisher implements XmlSerializable {

  /**
   * @var string $publishUrl
   */
   protected $publishUrl;

   /**
    * @var boolean $isPublished
    */
    protected $isPublished;

   /**
   * @param string $publishUrl
   * @param boolean $isPublished
   */
   function __construct($publishUrl, $isPublished) {
     $this->publishUrl = $publishUrl;
     $this->isPublished = $isPublished;
   }

   /**
    * @return string
    */
   function getValue() {
     return $this->publishUrl;
   }

   /**
 	 * The xmlSerialize metod is called during xml writing.
 	 *
 	 * Use the $writer argument to write its own xml serialization.
 	 *
 	 * An important note: do _not_ create a parent element. Any element
 	 * implementing XmlSerializble should only ever write what's considered
 	 * its 'inner xml'.
 	 *
 	 * The parent of the current element is responsible for writing a
 	 * containing element.
 	 *
 	 * This allows serializers to be re-used for different element names.
 	 *
 	 * If you are opening new elements, you must also close them again.
 	 *
 	 * @param Writer $writer
 	 * @return void
 	 */
   function xmlSerialize(Writer $writer) {
     if (!$this->isPublished) {
       $writer->write($this->publishUrl); // for pre-publish-url
     } else {
       $writer->writeElement('{DAV:}href', $this->publishUrl); // for publish-url
     }

  }
}