protected boolean toNextKey ( ) throws FetchException { byte [ ] initialKey = getCurrentKey ( ) ; if ( initialKey == null ) { return false ; } disableValue ( ) ; try { while ( true ) { if ( toNext ( ) ) { byte [ ] currentKey = getCurrentKey ( ) ; if ( currentKey == null ) { return false ; } if ( compareKeysPartially ( currentKey , initialKey ) > 0 ) { break ; } } else { return false ; } } } finally { enableKeyAndValue ( ) ; } return true ; }
Move the cursor to the next unique key returning false if none . If false is returned the cursor must be positioned after the last available entry . Subclasses may wish to override this method with a faster implementation .