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<?php
/*
* This class infers on relation between tags by storing all the including tags or synonymous tag.
* For example, if the user creates: tag1>tag2>tag3, the system can infer that tag is included into tag1.
* Instead of computing this relation several times, it is saved into this current table.
* For synonymy, this table stores also the group of synonymous tags.
* The table must be updated for each modification of the relations between tags.
*/
class TagCacheService {
var $db;
var $tablename;
function &getInstance(&$db) {
static $instance;
if (!isset($instance))
$instance =& new TagCacheService($db);
return $instance;
}
function TagCacheService(&$db) {
$this->db =& $db;
$this->tablename = $GLOBALS['tableprefix'] .'tagscache';
}
function getChildren($tag1, $uId) {
$tagservice =& ServiceFactory::getServiceInstance('TagService');
$tag1 = $tagservice->normalize($tag1);
if($tag1 == '') return false;
$query = "SELECT DISTINCT tag2 as 'tag'";
$query.= " FROM `". $this->getTableName() ."`";
$query.= " WHERE relationType = '>'";
$query.= " AND tag1 = '".$tag1."'";
$query.= " AND uId = '".$uId."'";
//die($query);
if (! ($dbresult =& $this->db->sql_query($query)) ){
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) {
$output[] = $row['tag'];
}
return $output;
}
function addChild($tag1, $tag2, $uId) {
$tagservice =& ServiceFactory::getServiceInstance('TagService');
$tag1 = $tagservice->normalize($tag1);
$tag2 = $tagservice->normalize($tag2);
if($tag1 == $tag2 || strlen($tag1) == 0 || strlen($tag2) == 0
|| ($this->existsChild($tag1, $tag2, $uId))) {
return false;
}
$values = array('tag1' => $tag1, 'tag2' => $tag2, '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 add tag cache inference', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
$this->db->sql_transaction('commit');
}
function removeChild($tag1, $tag2, $uId) {
if(($tag1 != '' && $tag1 == $tag2) ||
($tag1 == '' && $tag2 == '' && $uId == '')) {
return false;
}
$query = 'DELETE FROM '. $this->getTableName();
$query.= ' WHERE 1=1';
$query.= strlen($tag1)>0 ? ' AND tag1 = "'. $tag1 .'"' : '';
$query.= strlen($tag2)>0 ? ' AND tag2 = "'. $tag2 .'"' : '';
$query.= ' AND relationType = ">"';
$query.= strlen($uId)>0 ? ' AND uId = "'. $uId .'"' : '';
if (!($dbresult =& $this->db->sql_query($query))) {
message_die(GENERAL_ERROR, 'Could not remove tag cache inference', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
}
function removeChildren($tag1, $uId) {
$this->removeChild($tag1, NULL, $uId);
}
function existsChild($tag1, $tag2, $uId) {
$tagservice =& ServiceFactory::getServiceInstance('TagService');
$tag1 = $tagservice->normalize($tag1);
$tag2 = $tagservice->normalize($tag2);
$query = "SELECT tag1, tag2, relationType, uId FROM `". $this->getTableName() ."`";
$query.= " WHERE tag1 = '" .$tag1 ."'";
$query.= " AND tag2 = '".$tag2."'";
$query.= " AND relationType = '>'";
$query.= " AND uId = '".$uId."'";
//echo($query."<br>\n");
return $this->db->sql_numrows($this->db->sql_query($query)) > 0;
}
/*
* Synonyms of a same concept are a group. A group has one main synonym called key
* and a list of synonyms called values.
*/
function addSynonym($tag1, $tag2, $uId) {
if($tag1 == $tag2 || strlen($tag1) == 0 || strlen($tag2) == 0
|| ($this->existsSynonym($tag1, $tag2, $uId))) {
return false;
}
$case1 = '0'; // not in DB
if($this->_isSynonymKey($tag1, $uId)) {
$case1 = 'key';
} elseif($this->_isSynonymValue($tag1, $uId)) {
$case1 = 'value';
}
$case2 = '0'; // not in DB
if($this->_isSynonymKey($tag2, $uId)) {
$case2 = 'key';
} elseif($this->_isSynonymValue($tag2, $uId)) {
$case2 = 'value';
}
$case = $case1.$case2;
// all the possible cases
switch ($case) {
case 'keykey':
$values = $this->_getSynonymValues($tag2, $uId);
$this->removeSynonymGroup($tag2, $uId);
foreach($values as $value) {
$this->addSynonym($tag1, $value['tag'], $uId);
}
$this->addSynonym($tag1, $tag2, $uId);
break;
case 'valuekey':
$key = $this->_getSynonymKey($tag1, $uId);
$this->addSynonym($key, $tag2, $uId);
break;
case 'keyvalue':
$this->addSynonym($tag2, $tag1, $uId);
break;
case 'valuevalue':
$key1 = $this->_getSynonymKey($tag1, $uId);
$key2 = $this->_getSynonymKey($tag2, $uId);
$this->addSynonym($key1, $key2, $uId);
break;
case '0value':
$key = $this->_getSynonymKey($tag2, $uId);
$this->addSynonym($key, $tag1, $uId);
break;
case 'value0':
$this->addSynonym($tag2, $tag1, $uId);
break;
case '0key':
$this->addSynonym($tag2, $tag1, $uId);
break;
default:
$values = array('tag1' => $tag1, 'tag2' => $tag2, '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 add tag cache synonymy', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
$this->db->sql_transaction('commit');
break;
}
}
function removeSynonymGroup($tag1, $uId) {
$query = 'DELETE FROM '. $this->getTableName();
$query.= ' WHERE 1=1';
$query.= ' AND tag1 = "'. $tag1 .'"';
$query.= ' AND relationType = "="';
$query.= ' AND uId = "'. $uId .'"';
if (!($dbresult =& $this->db->sql_query($query))) {
message_die(GENERAL_ERROR, 'Could not remove tag cache inference', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
}
function _isSynonymKey($tag1, $uId) {
$tagservice =& ServiceFactory::getServiceInstance('TagService');
$tag1 = $tagservice->normalize($tag1);
$query = "SELECT tag1 FROM `". $this->getTableName() ."`";
$query.= " WHERE tag1 = '" .$tag1 ."'";
$query.= " AND relationType = '='";
$query.= " AND uId = '".$uId."'";
return $this->db->sql_numrows($this->db->sql_query($query)) > 0;
}
function _isSynonymValue($tag2, $uId) {
$tagservice =& ServiceFactory::getServiceInstance('TagService');
$tag2 = $tagservice->normalize($tag2);
$query = "SELECT tag2 FROM `". $this->getTableName() ."`";
$query.= " WHERE tag2 = '" .$tag2 ."'";
$query.= " AND relationType = '='";
$query.= " AND uId = '".$uId."'";
return $this->db->sql_numrows($this->db->sql_query($query)) > 0;
}
function getSynonyms($tag1, $uId) {
$values = array();
if($this->_isSynonymKey($tag1, $uId)) {
$values = $this->_getSynonymValues($tag1, $uId);
} elseif($this->_isSynonymValue($tag1, $uId)) {
$key = $this->_getSynonymKey($tag1, $uId);
$values = $this->_getSynonymValues($key, $uId, $tag1);
$values[] = $key;
}
return $values;
}
function _getSynonymKey($tag2, $uId) {
$tagservice =& ServiceFactory::getServiceInstance('TagService');
$tag2 = $tagservice->normalize($tag2);
if($this->_isSynonymKey($tag2)) return $tag2;
if($tag2 == '') return false;
$query = "SELECT DISTINCT tag1 as 'tag'";
$query.= " FROM `". $this->getTableName() ."`";
$query.= " WHERE relationType = '='";
$query.= " AND tag2 = '".$tag2."'";
$query.= " AND uId = '".$uId."'";
//die($query);
if (! ($dbresult =& $this->db->sql_query($query)) ){
message_die(GENERAL_ERROR, 'Could not get related tags', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
$row = $this->db->sql_fetchrow($dbresult);
return $row['tag'];
}
/*
* Return values associated with a key.
* $tagExcepted allows to hide a value.
*/
function _getSynonymValues($tag1, $uId, $tagExcepted = NULL) {
$tagservice =& ServiceFactory::getServiceInstance('TagService');
$tag1 = $tagservice->normalize($tag1);
$tagExcepted = $tagservice->normalize($tagExcepted);
if($tag1 == '') return false;
$query = "SELECT DISTINCT tag2 as 'tag'";
$query.= " FROM `". $this->getTableName() ."`";
$query.= " WHERE relationType = '='";
$query.= " AND tag1 = '".$tag1."'";
$query.= " AND uId = '".$uId."'";
$query.= $tagExcepted!=''?" AND tag2!='".$tagExcepted."'":"";
if (! ($dbresult =& $this->db->sql_query($query)) ){
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) {
$output[] = $row['tag'];
}
return $output;
}
function existsSynonym($tag1, $tag2, $uId) {
if($this->_getSynonymKey($tag1, $uId) == $tag2 || $this->_getSynonymKey($tag2, $uId) == $tag1) {
return true;
} else {
return false;
}
}
function updateTag($tag1, $relationType, $otherTags, $uId) {
if($relationType == '=') {
if($this->getSynonyms($tag1, $uId)) { // remove previous data avoiding unconstistency
$this->removeSynonymGroup($tag1, $uId);
}
foreach($otherTags as $tag2) {
$this->addSynonym($tag1, $tag2, $uId);
}
} elseif($relationType == '>') {
if(count($this->getChildren($tag1, $uId))>0) { // remove previous data avoiding unconstistency
$this->removeChildren($tag1);
}
foreach($otherTags as $tag2) {
$this->addChild($tag1, $tag2, $uId);
}
}
}
function deleteByUser($uId) {
$query = 'DELETE FROM '. $this->getTableName() .' WHERE uId = '. intval($uId);
if (!($dbresult = & $this->db->sql_query($query))) {
message_die(GENERAL_ERROR, 'Could not delete user tags cache', '', __LINE__, __FILE__, $query, $this->db);
return false;
}
return true;
}
function deleteAll() {
$query = 'TRUNCATE TABLE `'. $this->getTableName() .'`';
$this->db->sql_query($query);
}
// Properties
function getTableName() { return $this->tablename; }
function setTableName($value) { $this->tablename = $value; }
}
?>
|
