<?php
class FeedItem_Atom extends FeedItem_Common {

	function get_id() {
		$id = $this->elem->getElementsByTagName("id")->item(0);

		if ($id) {
			return $id->nodeValue;
		} else {
			return $this->get_link();
		}
	}

	function get_date() {
		$updated = $this->elem->getElementsByTagName("updated")->item(0);

		if ($updated) {
			return strtotime($updated->nodeValue);
		}

		$published = $this->elem->getElementsByTagName("published")->item(0);

		if ($published) {
			return strtotime($published->nodeValue);
		}

		$date = $this->xpath->query("dc:date", $this->elem)->item(0);

		if ($date) {
			return strtotime($date->nodeValue);
		}
	}
	
	function rel2abs($rel, $base)
	{
	    /* return if already absolute URL */
	    if (parse_url($rel, PHP_URL_SCHEME) != '') return $rel;
	
	    /* queries and anchors */
	    if ($rel[0]=='#' || $rel[0]=='?') return $base.$rel;
	
	    /* parse base URL and convert to local variables:
	       $scheme, $host, $path */
	    extract(parse_url($base));
	
	    /* remove non-directory element from path */
	    $path = preg_replace('#/[^/]*$#', '', $path);
	
	    /* destroy path if relative url points to root */
	    if ($rel[0] == '/') $path = '';
	
	    /* dirty absolute URL */
	    $abs = "$host$path/$rel";
	
	    /* replace '//' or '/./' or '/foo/../' with '/' */
	    $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
	    for($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}

	    /* absolute URL is ready! */
	    return $scheme.'://'.$abs;
	}
	
	function get_link() {
		$links = $this->elem->getElementsByTagName("link");

		foreach ($links as $link) {
			if ($link && $link->hasAttribute("href") &&
				(!$link->hasAttribute("rel")
					|| $link->getAttribute("rel") == "alternate"
					|| $link->getAttribute("rel") == "standout")) {
				$base = $this->xpath->evaluate("string(ancestor-or-self::*[@xml:base][1]/@xml:base)",$link);
				return $this->rel2abs($link->getAttribute("href"), $base);
			}
		}
	}

	function get_title() {
		$title = $this->elem->getElementsByTagName("title")->item(0);

		if ($title) {
			return $title->nodeValue;
		}
	}

	function get_content() {
		$content = $this->elem->getElementsByTagName("content")->item(0);

		if ($content) {
			if ($content->hasAttribute('type')) {
				if ($content->getAttribute('type') == 'xhtml') {
					for ($i = 0; $i < $content->childNodes->length; $i++) {
						$child = $content->childNodes->item($i);

						if ($child->hasChildNodes()) {
							return $this->doc->saveXML($child);
						}
					}
				}
			}

			return $content->nodeValue;
		}
	}

	function get_description() {
		$content = $this->elem->getElementsByTagName("summary")->item(0);

		if ($content) {
			if ($content->hasAttribute('type')) {
				if ($content->getAttribute('type') == 'xhtml') {
					for ($i = 0; $i < $content->childNodes->length; $i++) {
						$child = $content->childNodes->item($i);

						if ($child->hasChildNodes()) {
							return $this->doc->saveXML($child);
						}
					}
				}
			}

			return $content->nodeValue;
		}

	}

	function get_categories() {
		$categories = $this->elem->getElementsByTagName("category");
		$cats = array();

		foreach ($categories as $cat) {
			if ($cat->hasAttribute("term"))
				array_push($cats, $cat->getAttribute("term"));
		}

		$categories = $this->xpath->query("dc:subject", $this->elem);

		foreach ($categories as $cat) {
			array_push($cats, $cat->nodeValue);
		}

		return $cats;
	}

	function get_enclosures() {
		$links = $this->elem->getElementsByTagName("link");

		$encs = array();

		foreach ($links as $link) {
			if ($link && $link->hasAttribute("href") && $link->hasAttribute("rel")) {
				if ($link->getAttribute("rel") == "enclosure") {
					$enc = new FeedEnclosure();

					$enc->type = $link->getAttribute("type");
					$enc->link = $link->getAttribute("href");
					$enc->length = $link->getAttribute("length");

					array_push($encs, $enc);
				}
			}
		}

		$enclosures = $this->xpath->query("media:content", $this->elem);

		foreach ($enclosures as $enclosure) {
			$enc = new FeedEnclosure();

			$enc->type = $enclosure->getAttribute("type");
			$enc->link = $enclosure->getAttribute("url");
			$enc->length = $enclosure->getAttribute("length");

			array_push($encs, $enc);
		}

		return $encs;
	}

}
?>