public RequestParameters(String queryString) 
{
        this.names = new HashMap(5);
        if (queryString != null) {
            StringTokenizer st = new StringTokenizer(queryString, "&");
            while (st.hasMoreTokens()) {
                String pair = st.nextToken();
                int pos = pair.indexOf('=");
                if (pos != -1) {
                    this.setParameter(this.parseName(pair.substring(0, pos)),
                                      this.parseName(pair.substring(pos+1, pair.length())));
                }
            }
        }
}

Construct a new object from a queryString

 public String getParameter(String name) 
{
        if (names.containsKey(name)) {
            return (String)((ArrayList)names.get(name)).get(0);
        }
        return null;
}

Get the value of a parameter.

 public String getParameter(String name,
    String defaultValue) 
{
        if (names.containsKey(name)) {
            return (String)((ArrayList)names.get(name)).get(0);
        }
        return defaultValue;
}

Get the value of a parameter.

 public Enumeration getParameterNames() 
{
        return new EnumerationFromIterator(names.keySet().iterator());
}

Get all parameter names.

 public String[] getParameterValues(String name) 
{
        if (names.containsKey(name)) {
            String values[] = null;
            ArrayList list = (ArrayList)names.get(name);
            Iterator iter = list.iterator();
            while (iter.hasNext()) {
                if (values == null) {
                    values = new String[1];
                } else {
                    String[] copy = new String[values.length+1];
                    System.arraycopy(values, 0, copy, 0, values.length);
                    values = copy;
                }
                values[values.length-1] = (String)iter.next();
            }
            return values;
        }
        return null;
}

Get all values of a parameter.