similar to #getattribute , but asserts that there 's only one value for the provided key . uses guava 's iterables #getonlyelement , which may throw exceptions if there is n't exactly one element . concode_field_sep Multimap<String,String> attributes concode_elem_sep AspectParameters EMPTY concode_elem_sep ImmutableMultimap<String,String> attributes concode_field_sep ImmutableCollection<String> getAttribute concode_elem_sep Builder addAttribute concode_elem_sep AspectParameters build concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep boolean isEmpty concode_elem_sep String toString
String function ( String arg0 ) { return getOnlyElement ( getAttribute ( arg0 ) ) ; }