egroupware_official/infolog/inc/class.solink.inc.php

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2002-09-01 20:59:01 +02:00
<?php
/**************************************************************************\
* phpGroupWare - InfoLog Links *
* http://www.phpgroupware.org *
* Written by Ralf Becker <RalfBecker@outdoor-training.de> *
* -------------------------------------------- *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License, or (at your *
* option) any later version. *
\**************************************************************************/
/* $Id$ */
/*!
@class solink
@abstract generalized linking between entries of phpGroupware apps - DB layer
@discussion This class is to access the links in the DB
@note Links have to ends each pointing to an entry, an entry is a double:
@note app app-name or directory-name of an phpgw application, eg. 'infolog'
@note id this is the id, eg. an integer or a tupple like '0:INBOX:1234'
*/
class solink // DB-Layer
{
var $public_functions = array
(
'link' => True,
'get_links' => True,
'unlink' => True,
'chown' => True
);
var $db,$db2;
var $user;
var $db_name = 'phpgw_links';
var $debug = 0;
/*!
@function solink( )
@abstract constructor
*/
function solink( )
{
$this->db = $GLOBALS['phpgw']->db;
$this->user = $GLOBALS['phpgw_info']['user']['account_id'];
}
/*!
@function link( $app1,$name1,$id1,$app2,$name2,$id2,$remark='',$user=0 )
@abstract creats a link between $app1,$name1,$id1 and $app2,$name2,$id2
@param $remark Remark to be saved with the link (defaults to '')
@param $owner Owner of the link (defaults to user)
@note Does NOT check if link already exists
@returns db-errno or -1 (for param-error) or 0 for success
*/
function link( $app1,$id1,$app2,$id2,$remark='',$owner=0 )
{
if ($this->debug)
echo "<p>solink.link($app1,$id1,$app2,$id2,'$remark',$owner)</p>\n";
if ($app1 == $app2 && $id1 == $id2 ||
$id1 == '' || $id2 == '' || $app1 == '' || $app2 == '')
{
return -1; // dont link to self or other nosense
}
if (!$owner)
{
$owner = $this->user;
}
$remark = $this->db->db_addslashes($remark);
$lastmod = time();
$sql = "INSERT INTO $this->db_name (link_app1,link_id1,link_app2,link_id2,link_remark,link_lastmod,link_owner) ".
" VALUES ('$app1','$id1','$app2','$id2','$remark',$lastmod,$owner)";
if ($this->debug)
{
echo "<p>solink.link($app1,$id1,$app2,$id2,'$remark',$owner) sql='$sql'</p>\n";
}
$this->db->query($sql);
return $this->db->errno;
}
/*!
@function get_links( $app,$name,$id,$only_app='',$only_name='',$order='link_lastmod DESC' )
@abstract returns array of links to $app,$name,$id
@param $only_app if set return only links from $only_app (eg. only addressbook-entries)
@param $order defaults to newest links first
@returns array of links or empty array if no matching links found
*/
function get_links( $app,$id,$only_app='',$order='link_lastmod DESC' )
{
$links = array();
$sql = "SELECT * FROM $this->db_name".
" WHERE (link_app1 = '$app' AND link_id1 = '$id')".
" OR (link_app2 = '$app' AND link_id2 = '$id')".
($order != '' ? " ORDER BY $order" : '');
if ($this->debug)
{
echo "<p>solink.get_links($app,$id,$only_app,$order) sql='$sql'</p>\n";
}
$this->db->query($sql);
while ($this->db->next_record())
{
$row = $this->db->Record;
if ($row['link_app1'] == $app AND $row['link_id1'] == $id)
{
$link = array(
'app' => $row['link_app2'],
'id' => stripslashes($row['link_id2'])
);
}
else
{
$link = array(
'app' => $row['link_app1'],
'id' => stripslashes($row['link_id1'])
);
}
if ($only_app != '' && $link['app'] != $only_app)
{
continue;
}
$link['remark'] = stripslashes($row['link_remark']);
$link['owner'] = $row['link_owner'];
$link['lastmod'] = $row['link_lastmod'];
$link['link_id'] = $row['link_id'];
$links[] = $link;
}
return $links;
}
/*!
@function unlink($link_id,$app='',$id='',$owner='')
@abstract Remove link with $link_id or all links matching given params
@param $link_id link-id to remove if > 0
@param $app,$id,$owner if $link_id <= 0: removes all links matching the non-empty params
@returns the number of links deleted
*/
function unlink($link_id,$app='',$id='',$owner='')
{
$sql = "DELETE FROM $this->db_name WHERE ";
if ($link_id > 0)
{
$sql .= "link_id=$link_id";
}
elseif ($app == '' AND $owner == '')
{
return 0;
}
else
{
if ($app != '')
{
$sql .= "((link_app1='$app'";
$sql2 = '';
if ($id != '')
{
$sql .= " AND link_id1='$id'";
$sql2 .= " AND link_id2='$id'";
}
$sql .= ") OR (link_app2='$app'$sql2))";
}
if ($owner != '')
{
$sql .= ($app != '' ? ' AND ' : '') . "link_owner='$owner'";
}
}
if ($this->debug)
{
echo "<p>solink.unlink($link_id,$app,$id,$owner) sql='$sql'</p>\n";
}
$this->db->query($sql);
return $this->db->affected_rows();
}
/*!
@function chown($owner,$new_owner)
@abstract Changes ownership of all links from $owner to $new_owner
@discussion This is needed when a user/account gets deleted
@note Does NOT change the modification-time
@returns the number of links changed
*/
function chown($owner,$new_owner)
{
if ($owner <= 0 || $new_owner <= 0)
{
return 0;
}
$this->db->query("UPDATE $this->db_name SET owner=$new_owner WHERE owner=$owner");
return $this->db->affected_rows();
}
}