<?php

namespace Sabre\CalDAV\Xml\Property;

use Sabre\CalDAV\Plugin;
use Sabre\Xml\Element;
use Sabre\Xml\ParseException;
use Sabre\Xml\Reader;
use Sabre\Xml\Writer;

/**
 * SupportedCalendarComponentSet property.
 *
 * This class represents the
 * {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set property, as
 * defined in:
 *
 * https://tools.ietf.org/html/rfc4791#section-5.2.3
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class SupportedCalendarComponentSet implements Element
{
    /**
     * List of supported components.
     *
     * This array will contain values such as VEVENT, VTODO and VJOURNAL.
     *
     * @var array
     */
    protected $components = [];

    /**
     * Creates the property.
     */
    public function __construct(array $components)
    {
        $this->components = $components;
    }

    /**
     * Returns the list of supported components.
     *
     * @return array
     */
    public function getValue()
    {
        return $this->components;
    }

    /**
     * The xmlSerialize method 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 XmlSerializable 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.
     */
    public function xmlSerialize(Writer $writer)
    {
        foreach ($this->components as $component) {
            $writer->startElement('{'.Plugin::NS_CALDAV.'}comp');
            $writer->writeAttributes(['name' => $component]);
            $writer->endElement();
        }
    }

    /**
     * The deserialize method is called during xml parsing.
     *
     * This method is called statically, this is because in theory this method
     * may be used as a type of constructor, or factory method.
     *
     * Often you want to return an instance of the current class, but you are
     * free to return other data as well.
     *
     * You are responsible for advancing the reader to the next element. Not
     * doing anything will result in a never-ending loop.
     *
     * If you just want to skip parsing for this element altogether, you can
     * just call $reader->next();
     *
     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
     * the next element.
     *
     * @return mixed
     */
    public static function xmlDeserialize(Reader $reader)
    {
        $elems = $reader->parseInnerTree();

        $components = [];

        foreach ((array) $elems as $elem) {
            if ($elem['name'] === '{'.Plugin::NS_CALDAV.'}comp') {
                $components[] = $elem['attributes']['name'];
            }
        }

        if (!$components) {
            throw new ParseException('supported-calendar-component-set must have at least one CALDAV:comp element');
        }

        return new self($components);
    }
}
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