Added Zend_Feed_Reader_FeedSet class

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@18319 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Feed/Reader/FeedSet.php

@@ -0,0 +1,100 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Feed_Reader
+ * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: FeedSet.php 18318 2009-09-20 12:55:34Z padraic $
+ */
+
+/**
+ * @see Zend_Feed_Reader
+ */
+require_once 'Zend/Feed/Reader.php';
+
+/**
+ * @category   Zend
+ * @package    Zend_Feed_Reader
+ * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Feed_Reader_FeedSet extends ArrayObject
+{
+
+    public $rss = null;
+
+    public $rdf = null;
+
+    public $atom = null;
+
+    /**
+     * Import a DOMNodeList from any document containing a set of links
+     * for alternate versions of a document, which will normally refer to
+     * RSS/RDF/Atom feeds for the current document.
+     *
+     * All such links are stored internally, however the first instance of
+     * each RSS, RDF or Atom type has its URI stored as a public property
+     * as a shortcut where the use case is simply to get a quick feed ref.
+     *
+     * Note that feeds are not loaded at this point, but will be lazy
+     * loaded automatically when each links 'feed' array key is accessed.
+     *
+     * @param DOMNodeList $links
+     * @return void
+     */
+    public function addLinks(DOMNodeList $links)
+    {
+        foreach ($links as $link) {
+            if (strtolower($link->getAttribute('rel')) !== 'alternate'
+                || !$link->getAttribute('type') || !$link->getAttribute('href')) {
+                continue;
+            }
+            if (!isset($this->rss) && $link->getAttribute('type') == 'application/rss+xml') {
+                $this->rss = $link->getAttribute('href');
+            } elseif(!isset($this->atom) && $link->getAttribute('type') == 'application/atom+xml') {
+                $this->atom = $link->getAttribute('href');
+            } elseif(!isset($this->rdf) && $link->getAttribute('type') == 'application/rdf+xml') {
+                $this->rdf = $link->getAttribute('href');
+            }
+            $this[] = new self(array(
+                'rel' => 'alternate',
+                'type' => $link->getAttribute('type'),
+                'href' => $link->getAttribute('href'),
+            ));
+        }
+    }
+
+    /**
+     * Supports lazy loading of feeds using Zend_Feed_Reader::import() but
+     * delegates any other operations to the parent class.
+     *
+     * @param string $offset
+     * @return mixed
+     * @uses Zend_Feed_Reader
+     */
+    public function offsetGet($offset)
+    {
+        if ($offset == 'feed' && !$this->offsetExists('feed')) {
+            if (!$this->offsetExists('href')) {
+                return null;
+            }
+            $feed = Zend_Feed_Reader::import($this->offsetGet('href'));
+            $this->offsetSet('feed', $feed);
+            return $feed;
+        }
+        return parent::offsetGet($offset);
+    }
+
+}