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<?php
declare(strict_types=1);
namespace Sabre\DAV\Sync;
use Sabre\DAV;
/**
* If a class extends ISyncCollection, it supports WebDAV-sync.
*
* You are responsible for maintaining a changelist for this collection. This
* means that if any child nodes in this collection was created, modified or
* deleted in any way, you should maintain an updated changelist.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
interface ISyncCollection extends DAV\ICollection
{
/**
* This method returns the current sync-token for this collection.
* This can be any string.
*
* If null is returned from this function, the plugin assumes there's no
* sync information available.
*
* @return string|null
*/
public function getSyncToken();
/**
* The getChanges method returns all the changes that have happened, since
* the specified syncToken and the current collection.
*
* This function should return an array, such as the following:
*
* [
* 'syncToken' => 'The current synctoken',
* 'added' => [
* 'new.txt',
* ],
* 'modified' => [
* 'modified.txt',
* ],
* 'deleted' => array(
* 'foo.php.bak',
* 'old.txt'
* )
* ];
*
* The syncToken property should reflect the *current* syncToken of the
* collection, as reported getSyncToken(). This is needed here too, to
* ensure the operation is atomic.
*
* If the syncToken is specified as null, this is an initial sync, and all
* members should be reported.
*
* The modified property is an array of nodenames that have changed since
* the last token.
*
* The deleted property is an array with nodenames, that have been deleted
* from collection.
*
* The second argument is basically the 'depth' of the report. If it's 1,
* you only have to report changes that happened only directly in immediate
* descendants. If it's 2, it should also include changes from the nodes
* below the child collections. (grandchildren)
*
* The third (optional) argument allows a client to specify how many
* results should be returned at most. If the limit is not specified, it
* should be treated as infinite.
*
* If the limit (infinite or not) is higher than you're willing to return,
* you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
*
* If the syncToken is expired (due to data cleanup) or unknown, you must
* return null.
*
* The limit is 'suggestive'. You are free to ignore it.
*
* @param string $syncToken
* @param int $syncLevel
* @param int $limit
*
* @return array|null
*/
public function getChanges($syncToken, $syncLevel, $limit = null);
}
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