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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * AtomElement class for XML_Feed_Parser package

 *

 * PHP versions 5

 *

 * LICENSE: This source file is subject to version 3.0 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of

 * the PHP License and are unable to obtain it through the web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category   XML

 * @package    XML_Feed_Parser

 * @author     James Stewart <james@jystewart.net>

 * @copyright  2005 James Stewart <james@jystewart.net>

 * @license    http://www.gnu.org/copyleft/lesser.html  GNU LGPL 2.1

 * @version    CVS: $Id: AtomElement.php,v 1.2 2007-07-25 15:05:34 jp_milcent Exp $

 * @link       http://pear.php.net/package/XML_Feed_Parser/

 */

/**

 * This class provides support for atom entries. It will usually be called by

 * XML_Feed_Parser_Atom with which it shares many methods.

 *

 * @author    James Stewart <james@jystewart.net>

 * @version    Release: 1.0.2

 * @package XML_Feed_Parser

 */

class XML_Feed_Parser_AtomElement extends XML_Feed_Parser_Atom

{

    /**

     * This will be a reference to the parent object for when we want

     * to use a 'fallback' rule

     * @var XML_Feed_Parser_Atom

     */

    protected $parent;

    /**

     * When performing XPath queries we will use this prefix

     * @var string

     */

    private $xpathPrefix = '';

    /**

     * xml:base values inherited by the element

     * @var string

     */

    protected $xmlBase;

    /**

     * Here we provide a few mappings for those very special circumstances in

     * which it makes sense to map back to the RSS2 spec or to manage other

     * compatibilities (eg. with the Univeral Feed Parser). Key is the other version's

     * name for the command, value is an array consisting of the equivalent in our atom

     * api and any attributes needed to make the mapping.

     * @var array

     */

    protected $compatMap = array(

        'guid' => array('id'),

        'links' => array('link'),

        'tags' => array('category'),

        'contributors' => array('contributor'));

    /**

     * Our specific element map

     * @var array

     */

    protected $map = array(

        'author' => array('Person', 'fallback'),

        'contributor' => array('Person'),

        'id' => array('Text', 'fail'),

        'published' => array('Date'),

        'updated' => array('Date', 'fail'),

        'title' => array('Text', 'fail'),

        'rights' => array('Text', 'fallback'),

        'summary' => array('Text'),

        'content' => array('Content'),

        'link' => array('Link'),

        'enclosure' => array('Enclosure'),

        'category' => array('Category'));

    /**

     * Store useful information for later.

     *

     * @param   DOMElement  $element - this item as a DOM element

     * @param   XML_Feed_Parser_Atom    $parent - the feed of which this is a member

     */

    function __construct(DOMElement $element, $parent, $xmlBase = '')

    {

        $this->model = $element;

        $this->parent = $parent;

        $this->xmlBase = $xmlBase;

        $this->xpathPrefix = "//atom:entry[atom:id='" . $this->id . "']/";

        $this->xpath = $this->parent->xpath;

    }

    /**

     * Provides access to specific aspects of the author data for an atom entry

     *

     * Author data at the entry level is more complex than at the feed level.

     * If atom:author is not present for the entry we need to look for it in

     * an atom:source child of the atom:entry. If it's not there either, then

     * we look to the parent for data.

     *

     * @param   array

     * @return  string

     */

    function getAuthor($arguments)

    {

        /* Find out which part of the author data we're looking for */

        if (isset($arguments['param'])) {

            $parameter = $arguments['param'];

        } else {

            $parameter = 'name';

        }

        $test = $this->model->getElementsByTagName('author');

        if ($test->length > 0) {

            $item = $test->item(0);

            return $item->getElementsByTagName($parameter)->item(0)->nodeValue;

        }

        $source = $this->model->getElementsByTagName('source');

        if ($source->length > 0) {

            $test = $this->model->getElementsByTagName('author');

            if ($test->length > 0) {

                $item = $test->item(0);

                return $item->getElementsByTagName($parameter)->item(0)->nodeValue;

            }

        }

        return $this->parent->getAuthor($arguments);

    }

    /**

     * Returns the content of the content element or info on a specific attribute

     *

     * This element may or may not be present. It cannot be present more than

     * once. It may have a 'src' attribute, in which case there's no content

     * If not present, then the entry must have link with rel="alternate".

     * If there is content we return it, if not and there's a 'src' attribute

     * we return the value of that instead. The method can take an 'attribute'

     * argument, in which case we return the value of that attribute if present.

     * eg. $item->content("type") will return the type of the content. It is

     * recommended that all users check the type before getting the content to

     * ensure that their script is capable of handling the type of returned data.

     * (data carried in the content element can be either 'text', 'html', 'xhtml',

     * or any standard MIME type).

     *

     * @return  string|false

     */

    protected function getContent($method, $arguments = array())

    {

        $attribute = empty($arguments[0]) ? false : $arguments[0];

        $tags = $this->model->getElementsByTagName('content');

        if ($tags->length == 0) {

            return false;

        }

        $content = $tags->item(0);

        if (! $content->hasAttribute('type')) {

            $content->setAttribute('type', 'text');

        }

        if (! empty($attribute)) {

            return $content->getAttribute($attribute);

        }

        $type = $content->getAttribute('type');

        if (! empty($attribute)) {

            if ($content->hasAttribute($attribute))

            {

                return $content->getAttribute($attribute);

            }

            return false;

        }

        if ($content->hasAttribute('src')) {

            return $content->getAttribute('src');

        }

        return $this->parseTextConstruct($content);

     }

    /**

     * For compatibility, this method provides a mapping to access enclosures.

     *

     * The Atom spec doesn't provide for an enclosure element, but it is

     * generally supported using the link element with rel='enclosure'.

     *

     * @param   string  $method - for compatibility with our __call usage

     * @param   array   $arguments - for compatibility with our __call usage

     * @return  array|false

     */

    function getEnclosure($method, $arguments = array())

    {

        $offset = isset($arguments[0]) ? $arguments[0] : 0;

        $query = "//atom:entry[atom:id='" . $this->getText('id', false) .

            "']/atom:link[@rel='enclosure']";

        $encs = $this->parent->xpath->query($query);

        if ($encs->length > $offset) {

            try {

                if (! $encs->item($offset)->hasAttribute('href')) {

                    return false;

                }

                $attrs = $encs->item($offset)->attributes;

                $length = $encs->item($offset)->hasAttribute('length') ?

                    $encs->item($offset)->getAttribute('length') : false;

                return array(

                    'url' => $attrs->getNamedItem('href')->value,

                    'type' => $attrs->getNamedItem('type')->value,

                    'length' => $length);

            } catch (Exception $e) {

                return false;

            }

        }

        return false;

    }

    /**

     * Get details of this entry's source, if available/relevant

     *

     * Where an atom:entry is taken from another feed then the aggregator

     * is supposed to include an atom:source element which replicates at least

     * the atom:id, atom:title, and atom:updated metadata from the original

     * feed. Atom:source therefore has a very similar structure to atom:feed

     * and if we find it we will return it as an XML_Feed_Parser_Atom object.

     *

     * @return  XML_Feed_Parser_Atom|false

     */

    function getSource()

    {

        $test = $this->model->getElementsByTagName('source');

        if ($test->length == 0) {

            return false;

        }

        $source = new XML_Feed_Parser_Atom($test->item(0));

    }

    /**

     * Get the entry as an XML string

     *

     * Return an XML serialization of the feed, should it be required. Most

     * users however, will already have a serialization that they used when

     * instantiating the object.

     *

     * @return    string    XML serialization of element

     */

    function __toString()

    {

        $simple = simplexml_import_dom($this->model);

        return $simple->asXML();

    }

}

?>