question: void refreshUI ( String xml , DOMTree m_tree ) { if ( ( xml == null ) || xml . equals ( "" ) ) { setErrorMessage ( "Error" , "No input XML  specified \n" ) ; return ; } final Document newRoot = getRoot ( xml ) ; if ( newRoot == null ) { setErrorMessage ( "Error" , "Unable to get new DOM Tree \n" ) ; return ; } m_tree . setDocument ( newRoot ) ; }
target:  refreshUI is called when we have a new filename to parse.