question: public String replaceTokensWithValues ( String queryString , Map < String , Object > params ) throws BadRequestException { java . util . regex . Matcher matcher = tokenPattern . matcher ( queryString ) ; StringBuffer buffer = new StringBuffer ( ) ; while ( matcher . find ( ) ) { String tokenKey = matcher . group ( 1 ) ; if ( ! params . containsKey ( tokenKey ) ) { throw new BadRequestException ( "Missing entry in params passed to query for token " + tokenKey ) ; } else { Object replacement = params . get ( tokenKey ) ; if ( replacement instanceof List ) { StringBuffer commaSeparated = new StringBuffer ( ) ; boolean first = true ; for ( Object entry : ( ( List ) replacement ) ) { if ( ! first ) { commaSeparated . append ( "," ) ; } else { first = false ; } commaSeparated . append ( entry . toString ( ) ) ; } replacement = commaSeparated . toString ( ) ; } if ( replacement == null ) { replacement = "" ; } matcher . appendReplacement ( buffer , "" ) ; buffer . append ( replacement ) ; } } matcher . appendTail ( buffer ) ; return buffer . toString ( ) ; }
target:  Replaces a query string with tokens of format ${token-name} with the values from the passed in map, where the token-name must be the key in the map