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<?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_Service
* @subpackage Technorati
* @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: ResultSet.php 16211 2009-06-21 19:23:55Z thomas $
*/
/**
* @see Zend_Service_Technorati_Result
*/
require_once 'Zend/Service/Technorati/Result.php';
/**
* This is the most essential result set.
* The scope of this class is to be extended by a query-specific child result set class,
* and it should never be used to initialize a standalone object.
*
* Each of the specific result sets represents a collection of query-specific
* Zend_Service_Technorati_Result objects.
*
* @category Zend
* @package Zend_Service
* @subpackage Technorati
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @abstract
*/
abstract class Zend_Service_Technorati_ResultSet implements SeekableIterator
{
/**
* The total number of results available
*
* @var int
* @access protected
*/
protected $_totalResultsAvailable;
/**
* The number of results in this result set
*
* @var int
* @access protected
*/
protected $_totalResultsReturned;
/**
* The offset in the total result set of this search set
*
* @var int
* @todo
*/
// public $firstResultPosition;
/**
* A DomNodeList of results
*
* @var DomNodeList
* @access protected
*/
protected $_results;
/**
* Technorati API response document
*
* @var DomDocument
* @access protected
*/
protected $_dom;
/**
* Object for $this->_dom
*
* @var DOMXpath
* @access protected
*/
protected $_xpath;
/**
* XML string representation for $this->_dom
*
* @var string
* @access protected
*/
protected $_xml;
/**
* Current Item
*
* @var int
* @access protected
*/
protected $_currentIndex = 0;
/**
* Parses the search response and retrieves the results for iteration.
*
* @param DomDocument $dom the ReST fragment for this object
* @param array $options query options as associative array
*/
public function __construct(DomDocument $dom, $options = array())
{
$this->_init($dom, $options);
// Technorati loves to make developer's life really hard
// I must read query options in order to normalize a single way
// to display start and limit.
// The value is printed out in XML using many different tag names,
// too hard to get it from XML
// Additionally, the following tags should be always available
// according to API documentation but... this is not the truth!
// - querytime
// - limit
// - start (sometimes rankingstart)
// query tag is only available for some requests, the same for url.
// For now ignore them.
//$start = isset($options['start']) ? $options['start'] : 1;
//$limit = isset($options['limit']) ? $options['limit'] : 20;
//$this->_firstResultPosition = $start;
}
/**
* Initializes this object from a DomDocument response.
*
* Because __construct and __wakeup shares some common executions,
* it's useful to group them in a single initialization method.
* This method is called once each time a new instance is created
* or a serialized object is unserialized.
*
* @param DomDocument $dom the ReST fragment for this object
* @param array $options query options as associative array
* * @return void
*/
protected function _init(DomDocument $dom, $options = array())
{
$this->_dom = $dom;
$this->_xpath = new DOMXPath($dom);
$this->_results = $this->_xpath->query("//item");
}
/**
* Number of results returned.
*
* @return int total number of results returned
*/
public function totalResults()
{
return (int) $this->_totalResultsReturned;
}
/**
* Number of available results.
*
* @return int total number of available results
*/
public function totalResultsAvailable()
{
return (int) $this->_totalResultsAvailable;
}
/**
* Implements SeekableIterator::current().
*
* @return void
* @throws Zend_Service_Exception
* @abstract
*/
// abstract public function current();
/**
* Implements SeekableIterator::key().
*
* @return int
*/
public function key()
{
return $this->_currentIndex;
}
/**
* Implements SeekableIterator::next().
*
* @return void
*/
public function next()
{
$this->_currentIndex += 1;
}
/**
* Implements SeekableIterator::rewind().
*
* @return bool
*/
public function rewind()
{
$this->_currentIndex = 0;
return true;
}
/**
* Implement SeekableIterator::seek().
*
* @param int $index
* @return void
* @throws OutOfBoundsException
*/
public function seek($index)
{
$indexInt = (int) $index;
if ($indexInt >= 0 && $indexInt < $this->_results->length) {
$this->_currentIndex = $indexInt;
} else {
throw new OutOfBoundsException("Illegal index '$index'");
}
}
/**
* Implement SeekableIterator::valid().
*
* @return boolean
*/
public function valid()
{
return null !== $this->_results && $this->_currentIndex < $this->_results->length;
}
/**
* Returns the response document as XML string.
*
* @return string the response document converted into XML format
*/
public function getXml()
{
return $this->_dom->saveXML();
}
/**
* Overwrites standard __sleep method to make this object serializable.
*
* DomDocument and DOMXpath objects cannot be serialized.
* This method converts them back to an XML string.
*
* @return void
*/
public function __sleep() {
$this->_xml = $this->getXml();
$vars = array_keys(get_object_vars($this));
return array_diff($vars, array('_dom', '_xpath'));
}
/**
* Overwrites standard __wakeup method to make this object unserializable.
*
* Restores object status before serialization.
* Converts XML string into a DomDocument object and creates a valid
* DOMXpath instance for given DocDocument.
*
* @return void
*/
public function __wakeup() {
$dom = new DOMDocument();
$dom->loadXml($this->_xml);
$this->_init($dom);
$this->_xml = null; // reset XML content
}
}
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