lib/WikiDB/backend/dumb/WantedPagesIter.php

   1 <?php // -*-php-*-
   2 // rcs_id('$Id$');
   3
   4 //require_once('lib/WikiDB/backend.php');
   5
   6 /**
   7  * This iterator will work with any WikiDB_backend
   8  * which has a working get_links(,'links_from') method.
   9  *
  10  * This is mostly here for testing, 'cause it's slow,slow,slow.
  11  */
  12 class WikiDB_backend_dumb_WantedPagesIter
  13 extends WikiDB_backend_iterator
  14 {
  15     function WikiDB_backend_dumb_WantedPagesIter(&$backend, &$all_pages, $exclude='', $sortby='', $limit='') {
  16         $this->_allpages   = $all_pages;
  17         $this->_allpages_array   = $all_pages->asArray();
  18         $this->_backend = &$backend;
  19         if (!is_array($exclude))
  20             $this->exclude = $exclude ? PageList::explodePageList($exclude) : array();
  21         else
  22             $this->exclude = $exclude;
  23         $this->sortby = $sortby; // ignored
  24         if ($limit) { // extract from,count from limit
  25             list($this->from, $this->limit) = $backend->limit($limit);
  26         } else {
  27             $this->limit = 0;
  28             $this->from = 0;
  29         }
  30         $this->pos = 0;
  31         $this->pagelinks = array();
  32     }
  33
  34     function next() {
  35         while ($page = $this->_allpages->next()) {
  36             while ($this->pagelinks) { // deferred return
  37                 return array_pop($this->pagelinks);
  38             }
  39             $this->pagelinks = array();
  40             if ($this->limit and $this->pos > $this->limit) break;
  41             $pagename = $page['pagename'];
  42             $links = $this->_backend->get_links($pagename, false);
  43             while ($link = $links->next()) {
  44                 if ($this->limit and $this->pos > $this->limit) break;
  45                 if ($this->exclude and in_array($link['pagename'], $this->exclude)) continue;
  46                 // better membership for a pageiterator?
  47                 if (! in_array($link['pagename'], $this->_allpages_array)) {
  48                     if ($this->from and $this->pos < $this->from) continue;
  49                     // collect all links per page and return them deferred
  50                     $link['wantedfrom'] = $pagename;
  51                     $this->pagelinks[] = $link;
  52                     $this->pos++;
  53                 }
  54             }
  55             $links->free();
  56             unset($links);
  57             if ($this->pagelinks) return array_pop($this->pagelinks);
  58         }
  59         return false;
  60     }
  61
  62     function free() {
  63         unset($this->_allpages_array);
  64         $this->_allpages->free();
  65         unset($this->_allpages);
  66         unset($this->_backend);
  67     }
  68 }
  69
  70 // Local Variables:
  71 // mode: php
  72 // tab-width: 8
  73 // c-basic-offset: 4
  74 // c-hanging-comment-ender-p: nil
  75 // indent-tabs-mode: nil
  76 // End:
  77 ?>