mirror of
https://github.com/EGroupware/egroupware.git
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371 lines
10 KiB
PHP
371 lines
10 KiB
PHP
<?php
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/**
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* API - eGW wide index over all applications (super-index)
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*
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* @link http://www.egroupware.org
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage link
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* @version $Id$
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*/
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/**
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* eGW wide index over all applications (superindex)
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*
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* This index allows a fulltext search over all applications (or of cause also a single app).
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* Whenever an applications stores an entry it calls:
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*
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* boolean egw_index::save($app,$id,$owner,array $fields,array $cat_id=null),
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*
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* which calls, as the application do when is deletes an entry (!),
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*
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* boolean egw_index::delete($app,$id)
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*
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* and then splits all fields into keywords and add these to the index by
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*
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* boolean private egw_index::add($app,$id,$keyword).
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*
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* Applications can then use the index to search for a given keyword (and optional application):
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*
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* array egw_index::search($keyword,$app=null) or
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*
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* foreach(new egw_index($keyword,$app=null) as $app_id => $title)
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*
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* To also allow to search by a category or keyword part of it, the index also tracks the categories
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* of the entries. Applications can choose to only use it for category storage, or cat do it redundant in
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* there own table too. To retrieve the categories of one or multiple entries:
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*
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* array egw_index::cats($app,$ids)
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*
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* Applications can use a sql (sub-)query to get the id's of there app matching a certain keyword and
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* include that in there own queries:
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*
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* string egw_index::sql_ids_by_keyword($app,$keyword)
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*
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* Please note: the index knows nothing about ACL, so it's the task of the application to ensure ACL rights.
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*/
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class egw_index implements IteratorAggregate
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{
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const INDEX_TABLE = 'egw_index';
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const INDEX_CAT_TABLE = 'egw_cat2entry';
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const CAT_TABLE = 'egw_categories';
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const SEPERATORS = "[ ,;.:\"'!/?=()+*><|\n\r-]";
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const MIN_KEYWORD_LEN = 4;
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/**
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* Private reference to the global db object
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*
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* @var egw_db
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*/
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private static $db;
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/**
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* Search parameters of the constructor
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*
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* @var array
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*/
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private $search_params;
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/**
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* Constructor for the search iterator
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*
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* @param string $keyword
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* @param string $app=null
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* @param string $order='app' ordered by column: 'owner', 'id', 'app' (default)
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* @param string $sort='ASC' sorting 'ASC' (default) or 'DESC'
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* @param int $start=null if not null return limited resultset starting with row $start
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* @param int $num_rows=0 number of rows for a limited resultset, defaul maxmatches from the user prefs
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*/
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function __construct($keyword,$app=null,$order='title',$sort='ASC',$start=null,$num_rows=0)
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{
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$this->search_params = func_get_args();
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}
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/**
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* Return the result of egw_index::search() as ArrayIterator
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*
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* @return ArrayIterator
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*/
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function getIterator()
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{
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return new ArrayIterator(call_user_func_array(array(__CLASS__,'search'),$this->search_params));
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}
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/**
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* Search for keywords
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*
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* @param string $keyword
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* @param string $app=null
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* @param string $order='app' ordered by column: 'keyword', 'id', 'app' (default)
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* @param string $sort='ASC' sorting 'ASC' (default) or 'DESC'
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* @param int $start=null if not null return limited resultset starting with row $start
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* @param int $num_rows=null number of rows for a limited resultset, defaul maxmatches from the user prefs
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* @return array with "$app:$id" or $id => $title pairs
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*/
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static function &search($keyword,$app=null,$order='title',$sort='ASC',$start=null,$num_rows=null)
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{
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if (!in_array(strtoupper($sort),array('ASC','DESC'))) $sort = 'ASC';
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if (substr($order,0,3) != 'si_') $order = 'si_'.$order;
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if (!in_array($order,array('si_app','si_id','si_owner'))) $order = 'si_app';
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$rs = self::$db->union(array(
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array(
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'table' => self::INDEX_TABLE,
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'cols' => 'si_app,si_app_id,si_owner',
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'where' => array('keyword' => $keyword)+
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($app ? array('ce_app' => $app) : array()),
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),
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array(
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'table' => self::INDEX_CAT_TABLE,
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'cols' => 'ce_app,ce_app_id,ce_owner',
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'where' => array('cat_id IN (SELECT cat_id FROM '.self::CAT_TABLE.' WHERE cat_title '.
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self::$db->capabilities['case_insensitive_like'].' '.self::$db->quote('%'.$keyword.'%').')')+
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($app ? array('ce_app' => $app) : array()),
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),
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),__LINE__,__FILE__,$order.' '.$sort,$start,$num_rows);
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// agregate the ids by app
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$app_ids = $titles = $rows = array();
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foreach($rs as $row)
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{
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$app_ids[$row['si_app']] = $row['si_app_id'];
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$rows[] = $row;
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}
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unset($rs);
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// query the titles app-wise
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foreach($app_ids as $id_app => $ids)
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{
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$titles[$id_app] = bolink::titles($id_app,$ids);
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}
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$matches = array();
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foreach($rows as $row)
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{
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$key = $app ? $row['si_app_id'] : $row['si_app'].':'.$row['si_app_id'];
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$title = $titles[$row['si_app']][$row['si_app_id']];
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if (is_null($title)) // entry does not exist
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{
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self::delete($row['si_app'],$row['si_app_id']);
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error_log(__METHOD__.": not existing entry (is_null(title($row[si_app],$row[si_app_id])) deleted from index!");
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continue;
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}
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elseif($title === false)
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{
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$title = lang('Not readable %1 entry of user %2',lang($row['si_app']),$GLOBALS['egw']->common->grab_owner_name($row['si_owner']));
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}
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$matches[$key] = $title;
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}
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return $matches;
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//return iterator_to_array(new egw_index($keyword,$app,$order,$sort,$start,$num_rows),true);
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}
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/**
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* Stores the keywords for an entry in the index
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*
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* @param string $app
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* @param string/int $id
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* @param string $owner eGW account_id of the owner of the entry, used to create a "private entry of ..." title
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* @param array $fields
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* @param array/int/string $cat_ids=null optional cat_id(s) either comma-separated or as array
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* @return int/boolean false on error, othwerwise number off added keywords
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*/
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static function save($app,$id,$owner,array $fields,$cat_ids=null)
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{
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if (!$app || !$id)
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{
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return false;
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}
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// collect the keywords of all fields
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$keywords = array();
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foreach($fields as $field)
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{
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$tmpArray = @preg_split(self::SEPERATORS,$field);
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if (is_array($tmpArray)) {
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foreach($tmpArray as $keyword)
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{
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if (!in_array($keyword,$keywords) && strlen($keyword) >= self::MIN_KEYWORD_LEN && !is_numeric($keyword))
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{
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$keywords[] = $keyword;
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}
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}
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}
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}
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// delete evtl. existing current keywords
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self::delete($app,$id);
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// add the keywords
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foreach($keywords as $key => &$keyword)
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{
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if (!self::add($app,$id,$keyword,$owner)) // add can reject keywords
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{
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unset($keywords[$key]);
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}
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}
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// delete the existing cats
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self::delete_cats($app,$id);
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// add the cats
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if ($cat_ids)
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{
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self::add_cats($app,$id,$cat_ids,$owner);
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}
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return count($keywords);
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}
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/**
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* Delete the keywords for an entry or an entire application
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*
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* @param string $app
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* @param string/int $id=null
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*/
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static function delete($app,$id=null)
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{
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if (!$app)
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{
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return false;
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}
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$where = array('si_app' => $app);
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if ($id)
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{
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$where['si_app_id'] = $id;
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}
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return !!self::$db->delete(self::INDEX_TABLE,$where,__LINE__,__FILE__);
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}
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/**
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* Returns the cats of an entry or multiple entries
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*
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* @param string $app
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* @param string/int/array $ids
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* @return array with cats or single id or id => array with cats pairs
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*/
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static function cats($app,$ids)
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{
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if (!$app || !$ids)
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{
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return array();
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}
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$cats = array();
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foreach(self::$db->select(self::INDEX_CAT_TABLE,'cat_id,ce_app_id',array(
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'ce_app' => $app,
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'ce_app_id' => $ids,
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),__LINE__,__FILE__) as $row)
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{
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$cats[$row['ce_app_id']][] = $row['cat_id'];
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}
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return is_array($ids) ? $cats : $cats[(int)$ids];
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}
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/**
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* Get the SQL to fetch (eg. as subquery) the id's of a given app matching a keyword
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*
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* @param string $keyword
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* @param string $app
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* @return string
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*/
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static function sql_ids_by_keyword($keyword,$app)
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{
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return '(SELECT si_id FROM '.self::INDEX_TABLE.' WHERE si_app='.self::$db->quote($app).
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' AND si_keyword = '.self::$db->quote($keyword).') UNION '.
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'(SELECT ce_id FROM '.self::INDEX_CAT_TABLE.' WHERE si_app='.self::$db->quote($app).
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' AND cat_id IN (SELECT cat_id FROM '.self::CAT_TABLE.' WHERE cat_title '.self::$db->capabilities['case_insensitive_like'].' '.
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self::$db->quote('%'.$keyword.'%').'))';
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}
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/**
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* Stores one keyword for an entry in the index
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*
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* @todo reject keywords which are common words ...
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* @param string $app
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* @param string/int $id
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* @param string $keyword
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* @param int $owner=null
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* @return boolean true if keyword added, false if it was rejected in future
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*/
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static private function add($app,$id,$keyword,$owner=null)
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{
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// todo: reject keywords which are common words, not sure how to do that for all languages
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// maybey we can come up with some own little statistic analysis:
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// all keywords more common then N % of the entries get deleted and moved to a separate table ...
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self::$db->insert(self::INDEX_TABLE,array(
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'si_keyword' => $keyword,
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'si_app' => $app,
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'si_app_id' => $id,
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'si_owner' => $owner,
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),false,__LINE__,__FILE__);
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return true;
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}
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/**
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* Stores the cat_id(s) for an entry
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*
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* @param string $app
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* @param string/int $id
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* @param array/int/string $cat_ids=null optional cat_id(s) either comma-separated or as array
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* @param int $owner=null
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* @return boolean true on success, false on error
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*/
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static private function add_cats($app,$id,$cat_ids,$owner=null)
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{
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if (!$app)
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{
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return false;
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}
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if (!$cat_ids)
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{
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return true; // nothing to do
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}
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foreach(is_array($cat_ids) ? $cat_ids : explode(',',$cat_ids) as $cat_id)
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{
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self::$db->insert(self::INDEX_CAT_TABLE,array(
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'cat_id' => $cat_id,
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'ce_app' => $app,
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'ce_app_id' => $id,
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'ce_owner' => $owner,
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),false,__LINE__,__FILE__);
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}
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return true;
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}
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/**
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* Delete the cat for an entry or an entire application
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*
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* @param string $app
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* @param string/int $id=null
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*/
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static private function delete_cats($app,$id=null)
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{
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if (!$app)
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{
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return false;
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}
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$where = array('ce_app' => $app);
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if ($id)
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{
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$where['ce_app_id'] = $id;
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}
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return !!self::$db->delete(self::INDEX_CAT_TABLE,$where,__LINE__,__FILE__);
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}
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/**
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* Init our static vars
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*/
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static function _init_static()
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{
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if (!is_object($GLOBALS['egw_setup']))
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{
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self::$db = $GLOBALS['egw']->db;
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}
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else
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{
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self::$db = $GLOBALS['egw_setup']->db;
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}
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}
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}
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egw_index::_init_static();
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