/**
* Computes rules for attribute of id <code>$attributeId</code>
*
* @param int $attributeId Attribute
* @return void
* @throws SQLException
*/
public static function computeRules($attributeId)
{
global $wgFreqPatternTagCloudMinSupport, $wgFreqPatternTagCloudMinConfidence;
// Configuration
if (isset($wgFreqPatternTagCloudMinSupport)) {
FrequentPattern::$min_support = $wgFreqPatternTagCloudMinSupport;
}
if (isset($wgFreqPatternTagCloudMinConfidence)) {
FrequentPattern::$min_confidence = $wgFreqPatternTagCloudMinConfidence;
}
$dbr =& wfGetDB(DB_SLAVE);
$dbw =& wfGetDB(DB_MASTER);
// Compile items = all possible o_ids
if (!$attributeId) {
$res = $dbr->query("SELECT GROUP_CONCAT(smw_id)\n\t\t\t\t\t\tFROM " . $dbr->tableName("smw_ids") . "\n\t\t\t\t\t\tWHERE smw_namespace = 14\n\t\t\t\t\t\tAND LENGTH(smw_iw) = 0\n\t\t\t\t\t\tGROUP BY smw_namespace");
} else {
$res = $dbr->query("SELECT GROUP_CONCAT(DISTINCT o_id)\n\t\t\t\t\t\tFROM " . $dbr->tableName("smw_rels2") . "\n\t\t\t\t\t\tWHERE p_id = " . mysql_real_escape_string($attributeId) . "\n\t\t\t\t\t\tGROUP BY p_id");
}
$row = $res->fetchRow();
$items = explode(",", $row[0]);
$res->free();
// Compile transactions = all corelated o_ids (by s_id)
if (!$attributeId) {
$res = $dbr->query("SELECT GROUP_CONCAT(smw_id)\n\t\t\t\t\t\tFROM " . $dbr->tableName("smw_ids") . " ids, " . $dbr->tableName("categorylinks") . " catlinks\n\t\t\t\t\t\tWHERE ids.smw_title = catlinks.cl_to\n\t\t\t\t\t\tAND ids.smw_namespace = 14\n\t\t\t\t\t\tGROUP BY catlinks.cl_from");
} else {
$res = $dbr->query("SELECT GROUP_CONCAT(o_id)\n\t\t\t\t\t\tFROM " . $dbr->tableName("smw_rels2") . "\n\t\t\t\t\t\tWHERE p_id = " . mysql_real_escape_string($attributeId) . "\n\t\t\t\t\t\tGROUP BY s_id");
}
$transactions = array();
while ($row = $res->fetchRow()) {
$transactions[] = explode(",", $row[0]);
}
$res->free();
// Run algorithm
$algorithm = new FrequentPatternApriori();
$rules = $algorithm->computeRules($items, $transactions, self::$min_support, self::$min_confidence);
foreach ($rules as $rule) {
// Push rules to db
$dbw->query("INSERT INTO " . $dbw->tableName("fptc_associationrules") . " (p_id, rule_support, rule_confidence)\n\t\t\t\t\t\tVALUES (" . mysql_real_escape_string($attributeId) . ", " . mysql_real_escape_string($rule->getSupport()) . ", " . mysql_real_escape_string($rule->getConfidence()) . ")");
$ruleId = $dbw->insertId();
foreach ($rule->getAssumption() as $item) {
$dbw->query("INSERT INTO " . $dbw->tableName("fptc_items") . " (o_id, rule_id, item_order)\n\t\t\t\t\t\t\tVALUES (" . mysql_real_escape_string($item) . ", " . mysql_real_escape_string($ruleId) . ", 0)");
}
foreach ($rule->getConclusion() as $item) {
$dbw->query("INSERT INTO " . $dbw->tableName("fptc_items") . " (o_id, rule_id, item_order)\n\t\t\t\t\t\t\tVALUES (" . mysql_real_escape_string($item) . ", " . mysql_real_escape_string($ruleId) . ", 1)");
}
}
$dbw->commit();
}
/**
* Executes special page (will be called when accessing special page)
*
* @param $par Mixed: parameter passed to the special page or null
*/
public function execute($par)
{
global $wgOut, $wgUser;
$this->setHeaders();
if (!$wgUser->isAllowed('protect')) {
// No admin
$wgOut->addWikiMsg('fptc-insufficient-rights-for-maintenance');
} else {
// Refresh frequent pattern rules
include_once "includes/FrequentPattern.php";
FrequentPattern::deleteAllRules();
FrequentPattern::computeAllRules();
// Notify user
$wgOut->addWikiMsg('fptc-refreshed-frequent-patterns');
}
}
/**
* Gets suggestions
*
* @param $attribute String: attribute
* @param $value String: chosen value
* @return string
*/
public static function getSuggestions($attribute, $value)
{
// Get similar tags, sorted by priority
$tags = FrequentPattern::getConclusions($attribute, $value);
if (!count($tags)) {
return '<li class="no_entries">-</li>';
} else {
$suggestions = array();
foreach ($tags as $number => $tag) {
$suggestions[] = sprintf('<li class="similar_tag"><a href="#browse_similar_tag" title="%2$s">%1$d. %2$s</a></li>', $number + 1, $tag);
}
return implode("\n", $suggestions);
}
}