<?php

namespace Providers;

require_once('Provider.php');

abstract class XmlFeed extends \Providers\Provider {

    protected $_feedUrl;
    protected $_feedXml;

    abstract protected function _getFeedUrl($feed);

    public function __construct($feed, $options=[]) {
        parent::__construct($feed, $options);
        $this->_feedUrl = $this->_getFeedUrl($feed);
        if (!$this->_feedUrl) {
            throw new Exception('XML feed "' . $feed . '" undefined');
        }
    }

    abstract protected function _parseFeedContent($feed);

    protected function _fetchItems() {
        $this->_feedXml = new \SimpleXMLElement($this->_feedUrl, 0, TRUE);
        return $this->_parseFeedContent($this->_feedXml);
    }

    protected function _spamFilter($content) {
        return $content;
    }

    protected function _sortContent($content) {
        return $content;
    }

}

?>