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-rw-r--r--services/tagcacheservice.php345
1 files changed, 345 insertions, 0 deletions
diff --git a/services/tagcacheservice.php b/services/tagcacheservice.php
new file mode 100644
index 0000000..bb82864
--- /dev/null
+++ b/services/tagcacheservice.php
@@ -0,0 +1,345 @@
+<?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; }
+}
+?>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 04:20:29 +0000