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<?php
class Tag2TagService {
var $db;
var $tablename;
function &getInstance(&$db) {
static $instance;
if (!isset($instance))
$instance =& new Tag2TagService($db);
return $instance;
}
function Tag2TagService(&$db) {
$this->db =& $db;
$this->tablename = $GLOBALS['tableprefix'] .'tags2tags';
}
function addLinkedTags($tag1, $tag2, $relationType, $uId) {
if($tag1 == $tag2) {
return false;
}
$values = array('tag1' => $tag1, 'tag2' => $tag2, 'relationType'=> $relationType, 'uId'=> $uId);
$query = 'INSERT INTO '. $this->getTableName() .' '. $this->db->sql_build_array('INSERT', $values);
//die($query);
if (!($dbresult =& $this->db->sql_query($query))) {
$this->db->sql_transaction('rollback');
message_die(GENERAL_ERROR, 'Could not attach tag to tag', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
$this->db->sql_transaction('commit');
// Update stats
$tsts =& ServiceFactory::getServiceInstance('TagStatService');
$tsts->updateStat($tag1, $relationType, $uId);
return true;
}
// Return the target linked tags. If inverseRelation is true, return the source linked tags.
function getLinkedTags($tag, $relationType, $uId = null, $inverseRelation = false, $stopList = array()) {
// Set up the SQL query.
if($inverseRelation) {
$queriedTag = "tag1";
$givenTag = "tag2";
} else {
$queriedTag = "tag2";
$givenTag = "tag1";
}
$query = "SELECT DISTINCT ". $queriedTag ." as 'tag'";
$query.= " FROM `". $this->getTableName() ."`";
$query.= " WHERE 1=1";
if($tag !=null) {
$query.= " AND ". $givenTag ." = '". $tag ."'";
}
if($relationType) {
$query.= " AND relationType = '". $relationType ."'";
}
if($uId != null) {
$query.= " AND uId = '".$uId."'";
}
//die($query);
if (! ($dbresult =& $this->db->sql_query_limit($query, $limit)) ){
message_die(GENERAL_ERROR, 'Could not get related tags', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
$rowset = $this->db->sql_fetchrowset($dbresult);
$output = array();
foreach($rowset as $row) {
if(!in_array($row['tag'], $stopList)) {
$output[] = $row['tag'];
}
}
//bijective case for '='
if($relationType == '=' && $inverseRelation == false) {
//$stopList[] = $tag;
$bijectiveOutput = $this->getLinkedTags($tag, $relationType, $uId, true, $stopList);
$output = array_merge($output, $bijectiveOutput);
//$output = array_unique($output); // remove duplication
}
return $output;
}
/* TODO: clean the outputs to obtain homogenous ones*/
function getAllLinkedTags($tag1, $relationType, $uId, $asFlatList=true, $stopList=array()) {
$asFlatList = true; //we disable the tree list parameter for the moment
if(in_array($tag1, $stopList)) {
return array();
}
$stopList[] = $tag1;
$linkedTags = $this->getLinkedTags($tag1, $relationType, $uId, false, $stopList);
if($relationType != '=') {
$linkedTags = array_merge($linkedTags, $this->getLinkedTags($tag1, '=', $uId, false, $stopList));
}
if(count($linkedTags) == 0) {
return array();
} else {
$output = array();
if($asFlatList == true) {
//$output[$tag1] = $tag1;
} else {
$output = array('node'=>$tag1);
}
foreach($linkedTags as $linkedTag) {
$allLinkedTags = $this->getAllLinkedTags($linkedTag, $relationType, $uId, $asFlatList, $stopList);
if($asFlatList == true) {
$output[] = $linkedTag;
if(is_array($allLinkedTags)) {
$output = array_merge($output, $allLinkedTags);
} else {
$output[] = $allLinkedTags;
}
} else {
$output[] = $allLinkedTags;
}
}
}
//$output = array_unique($output); // remove duplication
return $output;
}
function getOrphewTags($relationType, $uId = 0, $limit = null, $orderBy = null) {
$query = "SELECT DISTINCT tts.tag1 as tag";
$query.= " FROM `". $this->getTableName() ."` tts";
if($orderBy != null) {
$tsts =& ServiceFactory::getServiceInstance('TagStatService');
$query.= ", ".$tsts->getTableName() ." tsts";
}
$query.= " WHERE tts.tag1 <> ALL";
$query.= " (SELECT DISTINCT tag2 FROM `". $this->getTableName() ."`";
$query.= " WHERE relationType = '".$relationType."'";
if($uId > 0) {
$query.= " AND uId = '".$uId."'";
}
$query.= ")";
if($uId > 0) {
$query.= " AND tts.uId = '".$uId."'";
}
switch($orderBy) {
case "nb":
$query.= " AND tts.tag1 = tsts.tag1";
$query.= " AND tsts.relationType = '".$relationType."'";
if($uId > 0) {
$query.= " AND tsts.uId = ".$uId;
}
$query.= " ORDER BY tsts.nb DESC";
break;
case "depth": // by nb of descendants
$query.= " AND tts.tag1 = tsts.tag1";
$query.= " AND tsts.relationType = '".$relationType."'";
if($uId > 0) {
$query.= " AND tsts.uId = ".$uId;
}
$query.= " ORDER BY tsts.depth DESC";
break;
case "nbupdate":
$query.= " AND tts.tag1 = tsts.tag1";
$query.= " AND tsts.relationType = '".$relationType."'";
if($uId > 0) {
$query.= " AND tsts.uId = ".$uId;
}
$query.= " ORDER BY tsts.nbupdate DESC";
break;
}
if($limit != null) {
$query.= " LIMIT 0,".$limit;
}
if (! ($dbresult =& $this->db->sql_query($query)) ){
message_die(GENERAL_ERROR, 'Could not get linked tags', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
return $this->db->sql_fetchrowset($dbresult);
}
function existsLinkedTags($tag1, $tag2, $relationType, $uId) {
$query = "SELECT tag1, tag2, relationType, uId FROM `". $this->getTableName() ."`";
$query.= " WHERE tag1 = '" .$tag1 ."'";
$query.= " AND tag2 = '".$tag2."'";
$query.= " AND relationType = '". $relationType ."'";
$query.= " AND uId = '".$uId."'";
return $this->db->sql_numrows($this->db->sql_query($query)) > 0;
}
function removeLinkedTags($tag1, $tag2, $relationType, $uId) {
$query = 'DELETE FROM '. $this->getTableName();
$query.= ' WHERE tag1 = "'. $tag1 .'"';
$query.= ' AND tag2 = "'. $tag2 .'"';
$query.= ' AND relationType = "'. $relationType .'"';
$query.= ' AND uId = "'. $uId .'"';
if (!($dbresult =& $this->db->sql_query($query))) {
message_die(GENERAL_ERROR, 'Could not remove tag relation', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
// Update stats
$tsts =& ServiceFactory::getServiceInstance('TagStatService');
$tsts->updateStat($tag1, $relationType, $uId);
return true;
}
function deleteAll() {
$query = 'TRUNCATE TABLE `'. $this->getTableName() .'`';
$this->db->sql_query($query);
$tsts =& ServiceFactory::getServiceInstance('TagStatService');
$tsts->deleteAll();
}
// Properties
function getTableName() { return $this->tablename; }
function setTableName($value) { $this->tablename = $value; }
}
?>
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