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<?php
namespace Sabre\CardDAV\Backend;
/**
* WebDAV-sync support for CardDAV backends.
*
* In order for backends to advertise support for WebDAV-sync, this interface
* must be implemented.
*
* Implementing this can result in a significant reduction of bandwidth and CPU
* time.
*
* For this to work, you _must_ return a {http://sabredav.org/ns}sync-token
* property from getAddressBooksForUser.
*
* @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
interface SyncSupport extends BackendInterface {
/**
* The getChanges method returns all the changes that have happened, since
* the specified syncToken in the specified address book.
*
* This function should return an array, such as the following:
*
* [
* 'syncToken' => 'The current synctoken',
* 'added' => [
* 'new.txt',
* ],
* 'modified' => [
* 'modified.txt',
* ],
* 'deleted' => [
* 'foo.php.bak',
* 'old.txt'
* ]
* ];
*
* The returned syncToken property should reflect the *current* syncToken
* of the calendar, as reported in the {http://sabredav.org/ns}sync-token
* property. This is needed here too, to ensure the operation is atomic.
*
* If the $syncToken argument 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 $syncLevel 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 $limit 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 $addressBookId
* @param string $syncToken
* @param int $syncLevel
* @param int $limit
* @return array
*/
function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null);
}

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