question: public String toIdString ( ) { StringBuilder result = new StringBuilder ( ) ; if ( mIds != null ) { boolean mustAddDelimiter = false ; for ( Long item : mIds ) { if ( mustAddDelimiter ) { result . append ( DELIMITER ) ; } mustAddDelimiter = true ; result . append ( item ) ; } } return result . toString ( ) ; }
target:  converts this into komma seperated list of names 