original_string: public function merge()
      {
          if ($this->_mergeDone) {
              include_once 'Zend/Search/Lucene/Exception.php';
              throw new Zend_Search_Lucene_Exception('Merge is already done.');
          }
  
          if (count($this->_segmentInfos) < 1) {
              include_once 'Zend/Search/Lucene/Exception.php';
              throw new Zend_Search_Lucene_Exception(
                  'Wrong number of segments to be merged ('
                                                   . count($this->_segmentInfos)
                  . ').'
              );
          }
  
          $this->_mergeFields();
          $this->_mergeNorms();
          $this->_mergeStoredFields();
          $this->_mergeTerms();
  
          $this->_mergeDone = true;
  
          return $this->_writer->close();
      }
code: public function merge()
      {
          if ($this->_mergeDone) {
              include_once 'Zend/Search/Lucene/Exception.php';
              throw new Zend_Search_Lucene_Exception('Merge is already done.');
          }
  
          if (count($this->_segmentInfos) < 1) {
              include_once 'Zend/Search/Lucene/Exception.php';
              throw new Zend_Search_Lucene_Exception(
                  'Wrong number of segments to be merged ('
                                                   . count($this->_segmentInfos)
                  . ').'
              );
          }
  
          $this->_mergeFields();
          $this->_mergeNorms();
          $this->_mergeStoredFields();
          $this->_mergeTerms();
  
          $this->_mergeDone = true;
  
          return $this->_writer->close();
      }
code_tokens: public function merge ( ) { if ( $ this -> _mergeDone ) { include_once 'Zend/Search/Lucene/Exception.php' ; throw new Zend_Search_Lucene_Exception ( 'Merge is already done.' ) ; } if ( count ( $ this -> _segmentInfos ) < 1 ) { include_once 'Zend/Search/Lucene/Exception.php' ; throw new Zend_Search_Lucene_Exception ( 'Wrong number of segments to be merged (' . count ( $ this -> _segmentInfos ) . ').' ) ; } $ this -> _mergeFields ( ) ; $ this -> _mergeNorms ( ) ; $ this -> _mergeStoredFields ( ) ; $ this -> _mergeTerms ( ) ; $ this -> _mergeDone = true ; return $ this -> _writer -> close ( ) ; }
docstring: Do merge.
  
  Returns number of documents in newly created segment
  
  @return Zend_Search_Lucene_Index_SegmentInfo
  @throws Zend_Search_Lucene_Exception
docstring_tokens: Do merge .