question: public boolean implies ( Permission < ? > that ) { if ( category == null ) return true ; if ( ! category . isAssignableFrom ( that . category ) ) return false ; if ( action == null ) return true ; if ( ! action . equals ( that . action ) ) return false ; if ( instance == null ) return true ; if ( ! instance . equals ( that . instance ) ) return false ; return true ; }
target:  Checks if the specified permission is automatically granted/revoked  by 'this' permission being granted/revoked.