question: switches this mapper to read-only mode . subsequent invocations of #addmapping addmapping will trigger an exception . the implementation here should be called only once . it replaces the internal maps with unmodifiable ones . concode_field_sep Map<String,String> mapFullToCompact concode_elem_sep Map<String,String> mapCompactToFull concode_elem_sep CompactHeaderMapper DEFAULT concode_field_sep String getAlternateName concode_elem_sep String getCompactName concode_elem_sep void addMapping concode_elem_sep void createMaps concode_elem_sep String getFullName
target: void function ( ) { mapCompactToFull = Collections . unmodifiableMap ( mapCompactToFull ) ; mapFullToCompact = Collections . unmodifiableMap ( mapFullToCompact ) ; }