public RequestLine(String method,
    String uri,
    HttpVersion httpversion) 
{
        super();
        if (method == null) {
            throw new IllegalArgumentException("Method may not be null");
        }
        if (uri == null) {
            throw new IllegalArgumentException("URI may not be null");
        }
        if (httpversion == null) {
            throw new IllegalArgumentException("HTTP version may not be null");
        }
        this.method = method;
        this.uri = uri;
        this.httpversion = httpversion;
}

 public RequestLine(String method,
    String uri,
    String httpversion) throws ProtocolException 
{
        this(method, uri, HttpVersion.parse(httpversion));
}

 public HttpVersion getHttpVersion() 
{
        return this.httpversion;
}

 public String getMethod() 
{
        return this.method;
}

 public String getUri() 
{
        return this.uri;
}

 public static RequestLine parseLine(String l) throws HttpException 
{
          
        String method = null;
        String uri = null;
        String protocol = null;
        try {
            StringTokenizer st = new StringTokenizer(l, " ");
            method = st.nextToken();
            uri = st.nextToken();
            protocol = st.nextToken();
        } catch (NoSuchElementException e) {
            throw new ProtocolException("Invalid request line: " + l);
        }
        return new RequestLine(method, uri, protocol);
}

 public String toString() 
{
        StringBuffer sb = new StringBuffer();
        sb.append(this.method);
        sb.append(" ");
        sb.append(this.uri);
        sb.append(" ");
        sb.append(this.httpversion);
        return sb.toString();
}