/**
* Queries the NateGoSearch index with a set of keywords
*
* Querying does not directly return a set of results. This is due to the
* way NateGoSearch is designed. The document ids from this search are
* stored in a results table and accessed through a unique identifier.
*
* @param string $keywords the search string to query.
*
* @return NateGoSearchResult an object containing result information.
*
* @see NateGoSearchResult::getUniqueId()
*/
public function query($keywords)
{
static $unique_counter = 0;
$id = sha1(uniqid($unique_counter, true));
$keywords = $this->normalizeKeywordsForSpelling($keywords);
if ($this->spell_checker === null) {
$misspellings = array();
} else {
$misspellings = $this->spell_checker->getMisspellingsInPhrase($keywords);
}
$misspellings = $this->getPopularReplacements($keywords, $misspellings);
$keywords = $this->normalizeKeywordsForSearching($keywords);
$keywords_hash = sha1($keywords);
$results = new NateGoSearchResult($this->db, $id, $keywords, $this->document_types);
$results->addMisspellings($misspellings);
$searched_keywords = array();
$keyword = strtok($keywords, ' ');
while ($keyword) {
if (in_array($keyword, $this->blocked_words)) {
$results->addBlockedWords($keyword);
} else {
$searched_keywords[] = NateGoSearchIndexer::stemKeyword($keyword);
$results->addSearchedWords($keyword);
}
$keyword = strtok(' ');
}
$keywords = implode(' ', $searched_keywords);
if (count($this->document_types) > 0) {
$this->db->loadModule('Function');
$params = array($this->db->quote($keywords, 'text'), $this->db->quote($keywords_hash, 'text'), $this->quoteArray($this->document_types), $this->db->quote($id, 'text'));
$types = array('text');
$rs = $this->db->function->executeStoredProc('nateGoSearch', $params, $types);
if (MDB2::isError($rs)) {
throw new NateGoSearchDBException($rs);
}
$unique_id = $rs->fetchOne();
if (MDB2::isError($unique_id)) {
throw new NateGoSearchDBException($unique_id);
}
$unique_counter++;
$results->setUniqueId($unique_id);
$sql = sprintf('select count(document_id) from %s
where unique_id = %s', $results->getResultTable(), $this->db->quote($unique_id, 'text'));
$document_count = $this->db->queryOne($sql);
if (MDB2::isError($document_count)) {
throw new NateGoSearchDBException($document_count);
}
$results->setDocumentCount($document_count);
}
return $results;
}
