private void iterateGroupNodes ( long groupdId , NodeReader nodeReader ) { // while the index can be a long, the value is always an int int currentPointer = ( int ) headPointers . get ( groupdId ) ; checkArgument ( currentPointer != NULL , "valid group must have non-null head pointer" ) ; while ( currentPointer != NULL ) { checkState ( currentPointer < nextNodePointer , "error, corrupt pointer; max valid %s, found %s" , nextNodePointer , currentPointer ) ; nodeReader . read ( currentPointer ) ; currentPointer = nextPointers . get ( currentPointer ) ; } }
used to iterate over all non - null nodes in the data structure