<?php
/**
 * ownCloud - News
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Alessandro Cosentino <cosenal@gmail.com>
 * @author Bernhard Posselt <dev@bernhard-posselt.com>
 * @copyright Alessandro Cosentino 2012
 * @copyright Bernhard Posselt 2012, 2014
 */

namespace OCA\News\Fetcher;

interface IFeedFetcher {

    /**
     * @param string $url remote url of the feed
     * @param boolean $getFavicon if the favicon should also be fetched,
     * defaults to true
     * @param string $lastModified a last modified value from an http header
     * defaults to false. If lastModified matches the http header from the feed
     * no results are fetched
     * @param string $etag an etag from an http header.
     * If lastModified matches the http header from the feed
     * no results are fetched
     * @throws FetcherException if the fetcher encounters a problem
     * @return array an array containing the new feed and its items, first
     * element being the Feed and second element being an array of Items
     */
    function fetch($url, $getFavicon=true, $lastModified=null, $etag=null);

    /**
     * @param string $url the url that should be fetched
     * @return boolean if the fetcher can handle the url. This fetcher will be
     * used exclusively to fetch the feed and the items of the page
     */
    function canHandle($url);

}