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<?php
/**
* @package com_zoo
* @author YOOtheme http://www.yootheme.com
* @copyright Copyright (C) YOOtheme GmbH
* @license http://www.gnu.org/licenses/gpl.html GNU/GPL
*/
/**
* The category helper class.
*
* @package Component.Helpers
* @since 2.0
*/
class CategoryHelper extends AppHelper {
protected $_cache;
/**
* Class constructor
*
* @param string $app App instance.
* @since 2.0
*/
public function __construct($app) {
parent::__construct($app);
// get item id -> category ids cache
// refreshes after one hour automatically
$this->_cache = $app->cache->create($app->path->path('cache:') . '/item_category', true, 3600, 'apc');
if ($this->_cache && !$this->_cache->check()) {
$this->_cache = null;
}
}
/**
* Method to retrieve item's related category ids.
*
* @param int $item_id The items id
* @param boolean $published Include published categories only
*
* @return array category ids
*
* @since 2.0
*/
public function getItemsRelatedCategoryIds($item_id, $published = false) {
$key = $item_id.'_'.$published;
if ($this->_cache && $result = $this->_cache->get($key)) {
return $result;
}
// select item to category relations
$query = 'SELECT b.id'
.' FROM '.ZOO_TABLE_CATEGORY_ITEM.' AS a'
.' JOIN '.ZOO_TABLE_CATEGORY.' AS b ON a.category_id = b.id'
.' WHERE a.item_id='.(int) $item_id
.($published == true ? ' AND b.published = 1' : '')
.' UNION SELECT 0'
.' FROM '.ZOO_TABLE_CATEGORY_ITEM.' AS a'
.' WHERE a.item_id='.(int) $item_id.' AND a.category_id = 0';
$result = $this->app->database->queryResultArray($query);
if ($this->_cache) {
$this->_cache->set($key, $result);
$this->_cache->save();
}
return $result;
}
/**
* Method to add category related items.
*
* @param Item $item The item
* @param array $categories The category ids
*
* @return boolean true on success
*
* @since 2.0
*/
public function saveCategoryItemRelations($item, $categories) {
//init vars
$db = $this->app->database;
if (!is_array($categories)) {
$categories = array($categories);
}
// trigger an event to let 3rd party extend the category list
$this->app->event->dispatcher->notify($this->app->event->create($item, 'item:beforeSaveCategoryRelations', array('categories' => &$categories)));
$categories = array_unique($categories);
// delete category to item relations
$query = "DELETE FROM ".ZOO_TABLE_CATEGORY_ITEM
." WHERE item_id=".(int) $item->id;
// execute database query
$db->query($query);
// Generate the sql query for the categories
$query_string = '(%s,'.(int) $item->id.')';
$category_strings = array();
foreach ($categories as $category) {
if (is_numeric($category)) {
$category_strings[] = sprintf($query_string, $category);
}
}
// add category to item relations
// insert relation to database
if (!empty($category_strings)) {
$query = "INSERT INTO ".ZOO_TABLE_CATEGORY_ITEM
." (category_id, item_id) VALUES ".implode(',', $category_strings);
// execute database query
$db->query($query);
}
$this->clearItemCategoryCache();
return true;
}
/**
* Method to delete category related items.
*
* @param int $category_id The category id
*
* @return int number of affected rows
*
* @since 2.0
*/
public function deleteCategoryItemRelations($category_id) {
// delete category to item relations
$query = "DELETE FROM ".ZOO_TABLE_CATEGORY_ITEM
." WHERE category_id = ".(int) $category_id;
// execute database query
$result = $this->app->database->query($query);
$this->clearItemCategoryCache();
return $result;
}
/**
* Method to clear the item category cache
*
* @since 2.6.5
*/
public function clearItemCategoryCache() {
if ($this->_cache) {
$this->_cache->clear()->save();
}
}
}