egroupware/phpgwapi/inc/class.categories.inc.php

<?php
	/**************************************************************************\
	* phpGroupWare API - Categories                                            *
	* Written by Joseph Engo <jengo@phpgroupware.org>                          *
	*                  and Bettina Gille [ceb@phpgroupware.org]                *
	* Category manager                                                         *
	* Copyright (C) 2000, 2001 Joseph Engo, Bettina Gille                      *
	* Copyright (C) 2002, 2003 Bettina Gille                                   *
	* ------------------------------------------------------------------------ *
	* This library is part of the phpGroupWare API                             *
	* http://www.phpgroupware.org                                              * 
	* ------------------------------------------------------------------------ *
	* This library is free software; you can redistribute it and/or modify it  *
	* under the terms of the GNU Lesser General Public License as published by *
	* the Free Software Foundation; either version 2.1 of the License,         *
	* or any later version.                                                    *
	* This library is distributed in the hope that it will be useful, but      *
	* WITHOUT ANY WARRANTY; without even the implied warranty of               *
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     *
	* See the GNU Lesser General Public License for more details.              *
	* You should have received a copy of the GNU Lesser General Public License *
	* along with this library; if not, write to the Free Software Foundation,  *
	* Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA            *
	\**************************************************************************/
	/* $Id$ */

	/*!
	@class categories
	@abstract class adds ability for applications to make use of categories
	@discussion examples can be found in notes app
	*/
	class categories
	{
		var $account_id;
		var $app_name;
		var $cats;
		var $db;
		var $total_records;
		var $grants;

		/*!
		@function categories
		@abstract constructor for categories class
		@param $accountid account id
		@param $app_name app name defaults to current app
		*/
		function categories($accountid = '',$app_name = '')
		{
			$account_id = get_account_id($accountid);

			if (! $app_name)
			{
				$app_name = $GLOBALS['phpgw_info']['flags']['currentapp'];
			}

			$this->account_id	= $account_id;
			$this->app_name		= $app_name;
			$this->db			= $GLOBALS['phpgw']->db;
			$this->db2			= $this->db;
			$this->grants		= $GLOBALS['phpgw']->acl->get_grants($app_name);
		}

		/*!
		@function filter
		@abstract ?
		@param $type string
		@result string either subs or mains
		*/
		function filter($type)
		{
			switch ($type)
			{
				case 'subs':		$s = ' AND cat_parent != 0'; break;
				case 'mains':		$s = ' AND cat_parent = 0'; break;
				case 'appandmains':	$s = " AND cat_appname='" . $this->app_name . "' AND cat_parent =0"; break;
				case 'appandsubs':	$s = " AND cat_appname='" . $this->app_name . "' AND cat_parent !=0"; break;
				case 'noglobal':	$s = " AND cat_appname != '" . $this->app_name . "'"; break;
				case 'noglobalapp':	$s = " AND cat_appname = '" . $this->app_name . "' AND cat_owner != " . $this->account_id; break;
				default:			return False;
			}
			return $s;
		}

		/*!
		@function total
		@abstract returns the total number of categories for app, subs or mains
		@param $for one of either 'app' 'subs' or 'mains'
		@result integer count of categories
		*/
		function total($for = 'app')
		{
			switch($for)
			{
				case 'app':			$w = " WHERE cat_appname='" . $this->app_name . "'"; break;
				case 'appandmains':	$w = " WHERE cat_appname='" . $this->app_name . "' AND cat_parent =0"; break;
				case 'appandsubs':	$w = " WHERE cat_appname='" . $this->app_name . "' AND cat_parent !=0"; break;
				case 'subs':		$w = " WHERE cat_parent != 0"; break;
				case 'mains':		$w = " WHERE cat_parent = 0"; break;
				default:			return False;
			}

			$this->db->query("SELECT COUNT(cat_id) FROM phpgw_categories $w",__LINE__,__FILE__);
			$this->db->next_record();

			return $this->db->f(0);
		}

		function db2cats()
		{
			while ($this->db->next_record())
			{
				$cats[] = array
				(
					'cat_id'	=> $this->db->f('cat_id'),
					'owner'		=> $this->db->f('cat_owner'),
					'access'	=> $this->db->f('cat_access'),
					'app_name'	=> $this->db->f('cat_appname'),
					'main'		=> $this->db->f('cat_main'),
					'level'		=> $this->db->f('cat_level'),
					'parent'	=> $this->db->f('cat_parent'),
					'name'		=> $this->db->f('cat_name'),
					'descr'		=> $this->db->f('cat_description'),
					'data'		=> $this->db->f('cat_data'),
					'last_mod'	=> $this->db->f('last_mod')
				);
			}
			return $cats;
		}

		/*!
		@function return_array
		@abstract return an array populated with categories
		@param $type string defaults to 'all'
		@param $start ?
		@param $limit ?
		@param $query string defaults to ''
		@param $sort string sort order, either defaults to 'ASC'
		@param $order order by
		@param $globals True or False, includes the global phpgroupware categories or not
		@result $cats array
		*/
		function return_array($type,$start,$limit = True,$query = '',$sort = '',$order = '',$globals = False, $parent_id = '',$lastmod = -1)
		{
			$start = intval($start);
			$query = $this->db->db_addslashes($query);

			if ($globals)
			{
				$global_cats = " OR cat_appname='phpgw'";
			}

			$filter = $this->filter($type);
			
			if (!$sort)
			{
				$sort = 'ASC';
			}

			if ($order)
			{
				$ordermethod = " ORDER BY $order $sort";
			}
			else
			{
				$ordermethod = ' ORDER BY cat_main, cat_level, cat_name ASC';
			}

			if ($this->account_id == '-1')
			{
				$grant_cats = " cat_owner='-1' ";
			}
			else
			{
				if (is_array($this->grants))
				{
					$grants = $this->grants;
					while(list($user) = each($grants))
					{
						$public_user_list[] = $user;
					}
					reset($public_user_list);
					$grant_cats = " (cat_owner='" . $this->account_id . "' OR cat_owner='-1' OR cat_access='public' AND cat_owner in(" . implode(',',$public_user_list) . ")) ";
				}
				else
				{
					$grant_cats = " cat_owner='" . $this->account_id . "' OR cat_owner='-1' ";
				}
			}

			if (intval($parent_id) > 0)
			{
				$parent_id		= intval($parent_id);
				$parent_filter	= ' AND cat_parent=' . $parent_id;
			}

			if ($query)
			{
				$querymethod = " AND (cat_name LIKE '%$query%' OR cat_description LIKE '%$query%')";
			}

			if($lastmod >= 0)
			{
				$querymethod .= ' AND lastmod > ' . $lastmod;
			}

			$sql = "SELECT * from phpgw_categories WHERE (cat_appname='" . $this->app_name . "' AND" . $grant_cats . $global_cats . ")"
				. $parent_filter . $querymethod . $filter;
			
			$this->db2->query($sql,__LINE__,__FILE__);
			$this->total_records = $this->db2->num_rows();

			if ($limit)
			{
				$this->db->limit_query($sql . $ordermethod,$start,__LINE__,__FILE__);
			}
			else
			{
				$this->db->query($sql . $ordermethod,__LINE__,__FILE__);
			}

			return $this->db2cats();
		}

		function return_sorted_array($start,$limit = True,$query = '',$sort = '',$order = '',$globals = False, $parent_id = '')
		{
			$start		= intval($start);
			$parent_id	= intval($parent_id);
			$query		= $this->db->db_addslashes($query);

			if ($globals)
			{
				$global_cats = " OR cat_appname='phpgw'";
			}

			if (!$sort)
			{
				$sort = 'ASC';
			}

			if ($order)
			{
				$ordermethod = " ORDER BY $order $sort";
			}
			else
			{
				$ordermethod = ' ORDER BY cat_name ASC';
			}

			if ($this->account_id == '-1')
			{
				$grant_cats = ' cat_owner=-1 ';
			}
			else
			{
				if (is_array($this->grants))
				{
					$grants = $this->grants;
					while(list($user) = each($grants))
					{
						$public_user_list[] = $user;
					}
					reset($public_user_list);
					$grant_cats = " (cat_owner='" . $this->account_id . "' OR cat_owner='-1' OR cat_access='public' AND cat_owner in(" . implode(',',$public_user_list) . ")) ";
				}
				else
				{
					$grant_cats = " cat_owner='" . $this->account_id . "' or cat_owner='-1' ";
				}
			}

			$parent_select = ' AND cat_parent=' . $parent_id;

			if ($query)
			{
				$querymethod = " AND (cat_name LIKE '%$query%' OR cat_description LIKE '%$query%') ";
			}

			$sql = "SELECT * from phpgw_categories WHERE (cat_appname='" . $this->app_name . "' AND" . $grant_cats . $global_cats . ")"
					. $querymethod;

			$this->db2->query($sql . $parent_select,__LINE__,__FILE__);
			//$total_mains = $this->db2->num_rows();
			$this->total_records = $this->db2->num_rows();

			if ($limit)
			{
				$this->db->limit_query($sql . $parent_select . $ordermethod,$start,__LINE__,__FILE__);
			}
			else
			{
				$this->db->query($sql . $parent_select . $ordermethod,__LINE__,__FILE__);
			}

			$cats = $this->db2cats();

			$num_cats = count($cats);
			for ($i=0;$i < $num_cats;$i++)
			{
				$sub_select = ' AND cat_parent=' . $cats[$i]['cat_id'] . ' AND cat_level=' . ($cats[$i]['level']+1);

				/*$this->db2->query($sql . $sub_select,__LINE__,__FILE__);
				$total_subs += $this->db2->num_rows();

				if ($limit)
				{
					$this->db->limit_query($sql . $sub_select . $ordermethod,$start,__LINE__,__FILE__);
				}
				else
				{*/
					$this->db->query($sql . $sub_select . $ordermethod,__LINE__,__FILE__);
				//}

				$subcats = $this->db2cats();

				$num_subcats = count($subcats);
				if ($num_subcats != 0)
				{
					$newcats = array();
					for ($k = 0; $k <= $i; $k++)
					{
						$newcats[$k] = $cats[$k];
					}
					for ($k = 0; $k < $num_subcats; $k++)
					{
						$newcats[$k+$i+1] = $subcats[$k];
					}
					for ($k = $i+1; $k < $num_cats; $k++)
					{
						$newcats[$k+$num_subcats] = $cats[$k];
					}
					$cats = $newcats;
					$num_cats = count($cats);
				}
			}
			//$this->total_records = count($cats);
			//$this->total_records = $total_mains + $total_subs;
			return $cats;
		}

		/*!
		@function return_single
		@abstract return single
		@param $id integer id of category
		@result $cats  array populated with
		*/
		function return_single($cat_id = '')
		{
			$this->db->query('SELECT * FROM phpgw_categories WHERE cat_id=' . intval($cat_id),__LINE__,__FILE__);

			list($cat) = $this->db2cats();

			return $cat;
		}

		/*!
		@function formatted_list
		@abstract return into a select box, list or other formats
		@param $format currently only supports select (select box)
		@param $type string - subs or mains
		@param $selected - cat_id or array with cat_id values 
		@param $globals True or False, includes the global phpgroupware categories or not
		@result $s array - populated with categories
		*/

		function formatted_list($format,$type = 'all',$selected = '',$globals = False,$site_link = 'site')
		{
			if(is_array($format))
			{
				$temp_format	= $format['format'];
				$type			= (isset($format['type'])?$format['type']:'all');
				$selected		= (isset($format['selected'])?$format['selected']:'');
				$globals		= (isset($format['globals'])?$format['globals']:False);
				$site_link		= (isset($format['site_link'])?$format['site_link']:'site');
				settype($format,'string');
				$format			= $temp_format;
				unset($temp_format);
			}

			if (!is_array($selected))
			{
				$selected = explode(',',$selected);
			}

			if ($type != 'all')
			{
				$cats = $this->return_array($type,$start,False,$query,$sort,$order,$globals);
			}
			else
			{
				$cats = $this->return_sorted_array($start,False,$query,$sort,$order,$globals);
			}

			if ($format == 'select')
			{
				for ($i=0;$i<count($cats);$i++)
				{
					$s .= '<option value="' . $cats[$i]['cat_id'] . '"';
					if (in_array($cats[$i]['cat_id'],$selected))
					{
						$s .= ' selected';
					}
					$s .= '>';
					for ($j=0;$j<$cats[$i]['level'];$j++)
					{
						$s .= '&nbsp;.&nbsp;';
					}
					$s .= $GLOBALS['phpgw']->strip_html($cats[$i]['name']);
					if ($cats[$i]['app_name'] == 'phpgw')
					{
						$s .= '&nbsp;&lt;' . lang('Global') . '&gt;';
					}
					if ($cats[$i]['owner'] == '-1')
					{
						$s .= '&nbsp;&lt;' . lang('Global') . '&nbsp;' . lang($this->app_name) . '&gt;';
					}

					$s .= '</option>' . "\n";
				}
				return $s;
			}

			if ($format == 'list')
			{
				$space = '&nbsp;&nbsp;';

				$s  = '<table border="0" cellpadding="2" cellspacing="2">' . "\n";

				if ($this->total_records > 0)
				{
					for ($i=0;$i<count($cats);$i++)
					{
						$image_set = '&nbsp;';

						if (in_array($cats[$i]['cat_id'],$selected))
						{
							$image_set = '<img src="' . $GLOBALS['phpgw']->common->image('phpgwapi','roter_pfeil') . '">';
						}

						if (($cats[$i]['level'] == 0) && !in_array($cats[$i]['cat_id'],$selected))
						{
							$image_set = '<img src="' . $GLOBALS['phpgw']->common->image('phpgwapi','grauer_pfeil') . '">';
						}

						$space_set = str_repeat($space,$cats[$i]['level']);

						$s .= '<tr>' . "\n";
						$s .= '<td width="8">' . $image_set . '</td>' . "\n";
						$s .= '<td>' . $space_set . '<a href="' . $GLOBALS['phpgw']->link($site_link,'cat_id=' . $cats[$i]['cat_id']) . '">'
							. $GLOBALS['phpgw']->strip_html($cats[$i]['name'])
							. '</a></td>' . "\n"
							. '</tr>' . "\n";
					}
				}
				$s .= '</table>' . "\n";
				return $s;
			}
		}

		function formatted_xslt_list($data)
		{
			if(is_array($data))
			{
				$format			= (isset($data['format'])?$data['format']:'filter');
				$type			= (isset($data['type'])?$data['type']:'all');
				$selected		= (isset($data['selected'])?$data['selected']:'');
				$globals		= (isset($data['globals'])?$data['globals']:False);
			}

			if (!is_array($selected))
			{
				$selected = explode(',',$selected);
			}

			if ($type != 'all')
			{
				$cats = $this->return_array($type,$start,False,$query,$sort,$order,$globals);
			}
			else
			{
				$cats = $this->return_sorted_array($start,False,$query,$sort,$order,$globals);
			}

			switch($format)
			{
				case 'select':
					$GLOBALS['phpgw']->xslttpl->add_file($GLOBALS['phpgw']->common->get_tpl_dir('phpgwapi','default') . SEP . 'cat_select');
					break;
				case 'filter':
					$GLOBALS['phpgw']->xslttpl->add_file($GLOBALS['phpgw']->common->get_tpl_dir('phpgwapi','default') . SEP . 'cat_filter');
					break;
			}

			while (is_array($cats) && list(,$cat) = each($cats))
			{
				$sel_cat = '';
				if (in_array($cat['cat_id'],$selected))
				{
					$sel_cat = 'selected';
				}

				$name = '';
				for ($i=0;$i<$cat['level'];$i++)
				{
					$name .= '&nbsp;.&nbsp;';
				}
				$name .= $GLOBALS['phpgw']->strip_html($cat['name']);

				if ($cat['app_name'] == 'phpgw')
				{
					$name .= ' <' . lang('Global') . '>';
				}
				if ($cat['owner'] == '-1')
				{
					$name .= ' <' . lang('Global') . ' ' . lang($this->app_name) . '>';
				}

				$cat_list[] = array
				(
					'cat_id'	=> $cat['cat_id'],
					'name'		=> $name,
					'selected'	=> $sel_cat
				);
			}
			return $cat_list;
		}

		/*!
		@function add
		@abstract add categories
		@param $cat_name category name
		@param $cat_parent category parent
		@param $cat_description category description defaults to ''
		@param $cat_data category data defaults to ''
		*/
		function add($values)
		{
			$values['cat_id']	= intval($values['cat_id']);
			$values['parent']	= intval($values['parent']);

			if ($values['parent'] > 0)
			{
				$values['main']		= $this->id2item(array('cat_id' => $values['parent'],'item' => 'main'));
				$values['level']	= $this->id2item(array('cat_id' => $values['parent'],'item' => 'level'))+1;
			}

			$values['descr']	= $this->db->db_addslashes($values['descr']);
			$values['name']		= $this->db->db_addslashes($values['name']);

			if ($values['cat_id'] > 0)
			{
				$id_col = 'cat_id,';
				$id_val = $values['cat_id'].',';
			}
			$this->db->query("INSERT INTO phpgw_categories (${id_col}cat_parent,cat_owner,cat_access,cat_appname,cat_name,cat_description,cat_data,"
				. 'cat_main,cat_level,last_mod) VALUES (' . $id_val . $values['parent'] . ',' . $this->account_id . ",'" . $values['access']
				. "','" . $this->app_name . "','" . $values['name'] . "','" . $values['descr'] . "','" . $values['data']
				. "'," . intval($values['main']) . ',' . intval($values['level']) . ',' . time() . ')',__LINE__,__FILE__);

			$max = $this->db->get_last_insert_id('phpgw_categories','cat_id');
			$max = intval($max);
			if ($values['parent'] == 0)
			{
				$this->db->query('UPDATE phpgw_categories SET cat_main=' . $max . ' WHERE cat_id=' . $max,__LINE__,__FILE__);
			}
			return $max;
		}

		/*!
		@function delete
		@abstract delete category
		@param $cat_id int - category id
		*/
		function delete($data)
		{
			if(is_array($data))
			{
				$cat_id			= $data['cat_id'];
				$drop_subs		= (isset($data['drop_subs'])?$data['drop_subs']:False);
				$modify_subs	= (isset($data['modify_subs'])?$data['modify_subs']:False);
			}

			if ($cat_id > 0)
			{
				if ($drop_subs)
				{
					$subdelete = ' OR cat_parent=' . $cat_id . ' OR cat_main=' . $cat_id; 
				}

				if ($modify_subs)
				{
					$cats = $this->return_sorted_array('',False,'','','',False, $cat_id);

					$new_parent = $this->id2item(array('cat_id' => $cat_id,'item' => 'parent'));

					for ($i=0;$i<count($cats);$i++)
					{
						if ($cats[$i]['level'] == 1)
						{
							$this->db->query('UPDATE phpgw_categories set cat_level=0, cat_parent=0, cat_main=' . intval($cats[$i]['cat_id'])
										. ' WHERE cat_id=' . intval($cats[$i]['cat_id']) . "' AND cat_appname='" . $this->app_name . "'",__LINE__,__FILE__);
							$new_main = $cats[$i]['cat_id'];
						}
						else
						{
							if ($new_main)
							{
								$update_main = ',cat_main=' . $new_main;
							}

							if ($cats[$i]['parent'] == $cat_id)
							{
								$update_parent = ',cat_parent=' . $new_parent;
							}

							$this->db->query('UPDATE phpgw_categories set cat_level=' . ($cats[$i]['level']-1) . $update_main . $update_parent 
											. ' WHERE cat_id=' . intval($cats[$i]['cat_id']) . "' AND cat_appname='" . $this->app_name . "'",__LINE__,__FILE__);
						}
					}
				}

				$this->db->query('DELETE FROM phpgw_categories WHERE cat_id=' . $cat_id . $subdelete . "' AND cat_appname='"
								. $this->app_name . "'",__LINE__,__FILE__);
			}
		}

		function subs($parent,&$subs,&$main)
		{
			if (!is_array($main))
			{
				$this->db->query('SELECT * from phpgw_categories WHERE cat_main=' . $main,__LINE__,__FILE__);
				$main = $this->db2cats();
				//echo "main: "; _debug_array($main);
			}
			reset($main);
			for ($n = 0; $n < count($main); $n++)
			{
				$cat = $main[$n];
				if ($cat['parent'] == $parent)
				{
					//echo "Adding($cat[cat_id])<br>";
					$subs[$cat['cat_id']] = $cat;
					$this->subs($cat['cat_id'],$subs,$main);
				}
			}
		}

		function reparent($values)
		{
			$id = $values['cat_id'];
			$parent = $values['parent'];
			$old_parent = $values['old_parent'];
			$main = $old_parent ? intval($this->id2name($old_parent,'main')) : $id;
			//echo "<p>reparent: $id/$main: $old_parent --> $parent</p>\n";

			$subs = array();
			$this->subs($id,$subs,$main);
         //echo "<p>subs($id) = "; _debug_array($subs);

			if (isset($subs[$parent]))
			{
				//echo "<p>new parent $parent is sub of $id</p>\n";
				$parent = $subs[$parent];
				$parent['old_parent'] = $parent['parent'];
				$parent['parent'] = intval($values['old_parent']);
				$this->reparent($parent);

				unset($parent['old_parent']);
				unset($parent['main']);

				$this->edit($parent);
				$this->reparent($values);
				return;
			}

			$new_main = $parent ? $this->id2name($parent,'main') : $id;
			$new_parent_level = $parent ? $this->id2name($parent,'level') : -1;
			$old_parent_level = $old_parent ? $this->id2name($old_parent,'level') : -1;
			$level_adj = $old_parent_level - $new_parent_level;
			reset($subs);
         //echo "new_main=$new_main,level_adj = $level_adj<br>";
			while (list($n) = each($subs))
			{
				$subs[$n]['main'] = $new_main;
				$subs[$n]['level'] -= $level_adj;
				//echo "<p>$n: id=".$subs[$n]['cat_id']." set main to $new_main, subs[$n] = \n"; _debug_array($subs[$n]);
				$this->edit($subs[$n]);
			}
		}

		/*!
		@function edit
		@abstract edit a category
		@param $cat_id int - category id
		@param $cat_parent category parent
		@param $cat_description category description defaults to ''
		@param $cat_data category data defaults to ''
		*/
		function edit($values)
		{
			$values['cat_id']	= intval($values['id']);
			$values['parent']	= intval($values['parent']);

			if (isset($values['old_parent']) && $values['old_parent'] != $values['parent'])
			{
				//$this->delete(array('cat_id' => $values['cat_id'],'drop_subs' => False,'modify_subs' => True));
				//return $this->add($values);

				$this->reparent($values);
			}
			if (!isset($values['main']) || !isset($values['level']))
			{
				if ($values['parent'] > 0)
				{
					$values['main']		= intval($this->id2item(array('cat_id' => $values['parent'],'item' => 'main')));
					$values['level']	= intval($this->id2item(array('cat_id' => $values['parent'],'item' => 'level'))+1);
				}
				else
				{
					$values['main']		= $values['cat_id'];
					$values['level']	= 0;
				}
			}

			$values['descr']	= $this->db->db_addslashes($values['descr']);
			$values['name']		= $this->db->db_addslashes($values['name']);

			$sql = "UPDATE phpgw_categories SET cat_name='" . $values['name'] . "', cat_description='" . $values['descr']
					. "', cat_data='" . $values['data'] . "', cat_parent=" . $values['parent'] . ", cat_access='"
					. $values['access'] . "', cat_main=" . $values['main'] . ', cat_level=' . $values['level'] . ', last_mod=' . time()
					. " WHERE cat_appname='" . $this->app_name . "' AND cat_id=" . $values['cat_id'];
			$this->db->query($sql,__LINE__,__FILE__);
			return $values['cat_id'];
		}

		function name2id($cat_name)
		{
			$this->db->query("SELECT cat_id FROM phpgw_categories WHERE cat_name='" . $this->db->db_addslashes($cat_name) . "' "
							."AND cat_appname='" . $this->app_name . "' AND (cat_owner=" . $this->account_id ." OR cat_owner=-1)",__LINE__,__FILE__);

			if(!$this->db->num_rows())
			{
				return 0;
			}

			$this->db->next_record();

			return $this->db->f('cat_id');
		}

		function id2name($cat_id = '', $item = 'name')
		{
			return $this->id2item(array('cat_id' => $cat_id,'item' => $item));
		}

		function id2item($data)
		{
			if(is_array($data))
			{
				$cat_id	= $data['cat_id'];
				$item	= (isset($data['item'])?$data['item']:'name');
			}

			if ($cat_id == '')
			{
				return '--';
			}

			switch($item)
			{
				case 'name':	$value = 'cat_name'; break;
				case 'owner':	$value = 'cat_owner'; break;
				case 'main':	$value = 'cat_main'; break;
				case 'level':	$value = 'cat_level'; break;
				case 'data':	$value = 'cat_data'; break;
				case 'parent':	$value = 'cat_parent'; break;
			}

			$this->db->query("SELECT $value FROM phpgw_categories WHERE cat_id=" . $cat_id,__LINE__,__FILE__);
			$this->db->next_record();

			if ($this->db->f($value))
			{
				return $this->db->f($value);
			}
			else
			{
				if ($item == 'name')
				{
					return '--';
				}
			}
		}

		/*!
		@function exists
		@abstract used for checking if a category name exists
		@param $type subs or mains
		@param $cat_name category name
		@result boolean true or false
		*/
		function exists($type,$cat_name = '',$cat_id = '')
		{
			if(is_array($type))
			{
				$temp_type = $type['type'];
				$cat_name = $type['cat_name'] ? $type['cat_name'] : '';
				$cat_id = $type['cat_id'] ? $type['cat_id'] : '';
				settype($type,'string');
				$type = $temp_type;
				unset($temp_type);
			}

			$filter = $this->filter($type);

			if ($cat_name)
			{
				$cat_exists = " cat_name='" . $this->db->db_addslashes($cat_name) . "' "; 
			}

			if ($cat_id)
			{
				$cat_exists = ' cat_parent=' . $cat_id;
			}

			if ($cat_name && $cat_id)
			{
				$cat_exists = " cat_name='" . $this->db->db_addslashes($cat_name) . "' AND cat_id != " . $cat_id;
			}

			$this->db->query("SELECT COUNT(cat_id) FROM phpgw_categories WHERE $cat_exists $filter",__LINE__,__FILE__);

			$this->db->next_record();

			if ($this->db->f(0))
			{
				return True;
			}
			else
			{
				return False;
			}
		}
	}
?>