Source for file IteratorFindQuadsDb.php

Documentation is available at IteratorFindQuadsDb.php

  1. <?php 
  2. //----------------------------------------------------------------------------------
  3. // Class: IteratorFindQuadsDb
  4. // ----------------------------------------------------------------------------------
  5.  
  6.  
  7. /**
  8. * Implementation of a quad iterator.
  9. *
  10. * This Iterator should be used like:
  11. * for($iterator = $dataset->findInNamedGraphs(null,null,null,null); $iterator->valid(); $iterator->next())
  12. * {
  13. *    $currentQuad=$iterator->current();
  14. * };
  15. *
  16. *
  17. * @version  $Id: fsource_dataset__datasetIteratorFindQuadsDb.php.html 442 2007-06-01 16:19:26Z cax $
  18. * @author Daniel Westphal (http://www.d-westphal.de)
  19. *
  20. *
  21. * @package     dataset
  22. * @access    public
  23. ***/
  24. class IteratorFindQuadsDb
  25. {
  26.     /**
  27.     * Holds a reference to the associated DB resultSet.
  28.     *
  29.     * @var        $dbResultSets ADODB result
  30.     * @access    private
  31.     */
  32.     var $dbResultSet;
  33.     
  34.     /**
  35.     * Holds a reference to the associated datasetDb.
  36.     *
  37.     * @var        $datasetDb datasetDb
  38.     * @access    private
  39.     */
  40.     var $datasetDb;
  41.  
  42.     /**
  43.     * boolean value, if the results should be returned as triples.
  44.     *
  45.     * @var        boolean 
  46.     * @access    private
  47.     */
  48.     var $returnAsTriples;
  49.     
  50.     /**
  51.     * Constructor.
  52.     *
  53.     * @param dataset 
  54.     * @access    public
  55.     */
  56.     function IteratorFindQuadsDb(&$dbResultSet,&$datasetDb,$returnAsTriples=false)
  57.     {
  58.         $this->dbResultSet=& $dbResultSet;
  59.         $this->datasetDb=& $datasetDb;
  60.         $this->returnAsTriples=$returnAsTriples;
  61.     }
  62.     
  63.     /**
  64.     * Resets iterator list to start.
  65.     *
  66.     * @access public
  67.     */
  68.     function rewind()
  69.     {
  70.         //not supported
  71.     }
  72.     
  73.     /**
  74.     * Says if there are additional items left in the list.
  75.     *
  76.     * @return    boolean 
  77.     * @access    public
  78.     */
  79.     function valid()
  80.     {
  81.         if (($this->dbResultSet ===false) OR ($this->dbResultSet->EOF) )
  82.             return false;
  83.         
  84.         return true;
  85.     }
  86.     
  87.     /**
  88.     * Moves Iterator to the next item in the list.
  89.     *
  90.     * @access    public
  91.     */
  92.     function next()
  93.     {
  94.         if ($this->dbResultSet!==false)
  95.             $this->dbResultSet->moveNext();
  96.     }
  97.     
  98.     /**
  99.     * Returns the current item.
  100.     *
  101.     * @return    mixed 
  102.     * @access    public
  103.     */
  104.     function &current()
  105.     {
  106.         if ($this->dbResultSet===false)
  107.             return null;
  108.         // subject
  109.         if ($this->dbResultSet->fields[5] == 'r')
  110.         $sub = new Resource($this->dbResultSet->fields[0]);
  111.         else
  112.         $sub = new BlankNode($this->dbResultSet->fields[0]);
  113.  
  114.         // predicate
  115.         $pred = new Resource($this->dbResultSet->fields[1]);
  116.  
  117.         // object
  118.         if ($this->dbResultSet->fields[6] == 'r')
  119.         $obj = new Resource($this->dbResultSet->fields[2]);
  120.         elseif ($this->dbResultSet->fields[6] == 'b')
  121.         $obj = new BlankNode($this->dbResultSet->fields[2]);
  122.         else {
  123.             $obj = new Literal($this->dbResultSet->fields[2], $this->dbResultSet->fields[3]);
  124.             if ($this->dbResultSet->fields[4])
  125.             $obj->setDatatype($this->dbResultSet->fields[4]);
  126.         }
  127.  
  128.         if($this->returnAsTriples)
  129.             return (new Statement($sub, $pred, $obj));
  130.  
  131.         return (new Quad(new Resource($this->dbResultSet->fields[7]),$sub,$pred,$obj));
  132.     }
  133.     
  134.     /**
  135.     * Returns the key of the current item.
  136.     *
  137.     * @return    integer 
  138.     * @access    public
  139.     */
  140.     function key()
  141.     {
  142.         return $this->dbResultSet->_currentRow;
  143.     }
  144. }
  145. ?>

Documentation generated on Fri, 1 Jun 2007 16:49:35 +0200 by phpDocumentor 1.3.2