question: public QueryStringDecoder ( URI uri , Charset charset , int maxParams ) { if ( uri == null ) { throw new NullPointerException ( "getUri" ) ; } if ( charset == null ) { throw new NullPointerException ( "charset" ) ; } if ( maxParams <= 0 ) { throw new IllegalArgumentException ( "maxParams: " + maxParams + " (expected: a positive integer)" ) ; } String rawPath = uri . getRawPath ( ) ; if ( rawPath != null ) { hasPath = true ; } else { rawPath = "" ; hasPath = false ; } this . uri = rawPath + ( uri . getRawQuery ( ) == null ? "" : '?' + uri . getRawQuery ( ) ) ; this . charset = charset ; this . maxParams = maxParams ; }
target:  Creates a new decoder that decodes the specified URI encoded in the specified charset.