<?php

/**
 * Class for handling SAML2 metadata extensions.
 *
 * @package simpleSAMLphp
 * @version $Id$
 */
class SAML2_XML_md_Extensions {

	/**
	 * Get a list of Extensions in the given element.
	 *
	 * @param DOMElement $parent  The element that may contain the md:Extensions element.
	 * @return array  Array of extensions.
	 */
	public static function getList(DOMElement $parent) {

		$ret = array();
		foreach (SAML2_Utils::xpQuery($parent, './saml_metadata:Extensions/*') as $node) {
			if ($node->namespaceURI === SAML2_XML_shibmd_Scope::NS && $node->localName === 'Scope') {
				$ret[] = new SAML2_XML_shibmd_Scope($node);
			} elseif ($node->namespaceURI === SAML2_XML_mdattr_EntityAttributes::NS && $node->localName === 'EntityAttributes') {
				$ret[] = new SAML2_XML_mdattr_EntityAttributes($node);
			} elseif ($node->namespaceURI === SAML2_XML_mdrpi_Common::NS_MDRPI && $node->localName === 'PublicationInfo') {
				$ret[] = new SAML2_XML_mdrpi_PublicationInfo($node);
			} elseif ($node->namespaceURI === SAML2_XML_mdui_UIInfo::NS && $node->localName === 'UIInfo') {
				$ret[] = new SAML2_XML_mdui_UIInfo($node);
			} elseif ($node->namespaceURI === SAML2_XML_mdui_DiscoHints::NS && $node->localName === 'DiscoHints') {
				$ret[] = new SAML2_XML_mdui_DiscoHints($node);
			} else {
				$ret[] = new SAML2_XML_Chunk($node);
			}
		}

		return $ret;
	}


	/**
	 * Add a list of Extensions to the given element.
	 *
	 * @param DOMElement $parent  The element we should add the extensions to.
	 * @param array $extensions  List of extension objects.
	 */
	public static function addList(DOMElement $parent, array $extensions) {

		if (empty($extensions)) {
			return;
		}

		$extElement = $parent->ownerDocument->createElementNS(SAML2_Const::NS_MD, 'md:Extensions');
		$parent->appendChild($extElement);

		foreach ($extensions as $ext) {
			$ext->toXML($extElement);
		}
	}

}
