original_string: public function renameFile($from, $to)
      {
          global $php_errormsg;
  
          if (isset($this->_fileHandlers[$from])) {
              $this->_fileHandlers[$from]->close();
          }
          unset($this->_fileHandlers[$from]);
  
          if (isset($this->_fileHandlers[$to])) {
              $this->_fileHandlers[$to]->close();
          }
          unset($this->_fileHandlers[$to]);
  
          if (file_exists($this->_dirPath . '/' . $to)) {
              if (!unlink($this->_dirPath . '/' . $to)) {
                  include_once 'Zend/Search/Lucene/Exception.php';
                  throw new Zend_Search_Lucene_Exception('Delete operation failed');
              }
          }
  
          $trackErrors = ini_get('track_errors');
          ini_set('track_errors', '1');
  
          $success = @rename($this->_dirPath . '/' . $from, $this->_dirPath . '/' . $to);
          if (!$success) {
              ini_set('track_errors', $trackErrors);
              include_once 'Zend/Search/Lucene/Exception.php';
              throw new Zend_Search_Lucene_Exception($php_errormsg);
          }
  
          ini_set('track_errors', $trackErrors);
  
          return $success;
      }
code: public function renameFile($from, $to)
      {
          global $php_errormsg;
  
          if (isset($this->_fileHandlers[$from])) {
              $this->_fileHandlers[$from]->close();
          }
          unset($this->_fileHandlers[$from]);
  
          if (isset($this->_fileHandlers[$to])) {
              $this->_fileHandlers[$to]->close();
          }
          unset($this->_fileHandlers[$to]);
  
          if (file_exists($this->_dirPath . '/' . $to)) {
              if (!unlink($this->_dirPath . '/' . $to)) {
                  include_once 'Zend/Search/Lucene/Exception.php';
                  throw new Zend_Search_Lucene_Exception('Delete operation failed');
              }
          }
  
          $trackErrors = ini_get('track_errors');
          ini_set('track_errors', '1');
  
          $success = @rename($this->_dirPath . '/' . $from, $this->_dirPath . '/' . $to);
          if (!$success) {
              ini_set('track_errors', $trackErrors);
              include_once 'Zend/Search/Lucene/Exception.php';
              throw new Zend_Search_Lucene_Exception($php_errormsg);
          }
  
          ini_set('track_errors', $trackErrors);
  
          return $success;
      }
code_tokens: public function renameFile ( $ from , $ to ) { global $ php_errormsg ; if ( isset ( $ this -> _fileHandlers [ $ from ] ) ) { $ this -> _fileHandlers [ $ from ] -> close ( ) ; } unset ( $ this -> _fileHandlers [ $ from ] ) ; if ( isset ( $ this -> _fileHandlers [ $ to ] ) ) { $ this -> _fileHandlers [ $ to ] -> close ( ) ; } unset ( $ this -> _fileHandlers [ $ to ] ) ; if ( file_exists ( $ this -> _dirPath . '/' . $ to ) ) { if ( ! unlink ( $ this -> _dirPath . '/' . $ to ) ) { include_once 'Zend/Search/Lucene/Exception.php' ; throw new Zend_Search_Lucene_Exception ( 'Delete operation failed' ) ; } } $ trackErrors = ini_get ( 'track_errors' ) ; ini_set ( 'track_errors' , '1' ) ; $ success = @ rename ( $ this -> _dirPath . '/' . $ from , $ this -> _dirPath . '/' . $ to ) ; if ( ! $ success ) { ini_set ( 'track_errors' , $ trackErrors ) ; include_once 'Zend/Search/Lucene/Exception.php' ; throw new Zend_Search_Lucene_Exception ( $ php_errormsg ) ; } ini_set ( 'track_errors' , $ trackErrors ) ; return $ success ; }
docstring: Renames an existing file in the directory.
  
  @param  string $from
  @param  string $to
  @return void
  @throws Zend_Search_Lucene_Exception
docstring_tokens: Renames an existing file in the directory .