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  package org.richfaces.json;
   Copyright (c) 2002
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  The Software shall be used for Good, not Evil.

Convert a web browser cookie specification to a JSONObject and back. JSON and Cookies are both notations for name/value pairs.

 public final class Cookie {
     private Cookie() {

Produce a copy of a string in which the characters '+', '%', '=', ';' and control characters are replaced with "%hh". This is a gentle form of URL encoding, attempting to cause as little distortion to the string as possible. The characters '=' and ';' are meta characters in cookies. By convention, they are escaped using the URL-encoding. This is only a convention, not a standard. Often, cookies are expected to have encoded values. We encode '=' and ';' because we must. We encode '%' and '+' because they are meta characters in URL encoding.

string The source string.
The escaped result.
     public static String escape(String string) {
         char c;
         String s = string.trim();
         StringBuffer sb = new StringBuffer();
         int len = s.length();
         for (int i = 0; i < leni += 1) {
             c = s.charAt(i);
             if ((c < ' ') || (c == '+') || (c == '%') || (c == '=') || (c == ';')) {
                 sb.append(Character.forDigit((char) ((c >>> 4) & 0x0f), 16));
                 sb.append(Character.forDigit((char) (c & 0x0f), 16));
             } else {
         return sb.toString();

Convert a cookie specification string into a JSONObject. The string will contain a name value pair separated by '='. The name and the value will be unescaped, possibly converting '+' and '%' sequences. The cookie properties may follow, separated by ';', also represented as name=value (except the secure property, which does not have a value). The name will be stored under the key "name", and the value will be stored under the key "value". This method does not do checking or validation of the parameters. It only converts the cookie string into a JSONObject.

string The cookie specification string.
A JSONObject containing "name", "value", and possibly other members.
     public static JSONObject toJSONObject(String stringthrows JSONException {
         String n;
         JSONObject o = new JSONObject();
         Object v;
         JSONTokener x = new JSONTokener(string);
         while (x.more()) {
             n = unescape(x.nextTo("=;"));
             if ( != '=') {
                 if (n.equals("secure")) {
                     v = .;
                 } else {
                     throw x.syntaxError("Missing '=' in cookie parameter.");
            } else {
                v = unescape(x.nextTo(';'));
        return o;

Convert a JSONObject into a cookie specification string. The JSONObject must contain "name" and "value" members. If the JSONObject contains "expires", "domain", "path", or "secure" members, they will be appended to the cookie specification string. All other members are ignored.

o A JSONObject
A cookie specification string
    public static String toString(JSONObject othrows JSONException {
        StringBuffer sb = new StringBuffer();
        if (o.has("expires")) {
        if (o.has("domain")) {
        if (o.has("path")) {
        if (o.optBoolean("secure")) {
        return sb.toString();

Convert %hh sequences to single characters, and convert plus to space.

s A string that may contain + (plus) and %hh sequences.
The unescaped string.
    public static String unescape(String s) {
        int len = s.length();
        StringBuffer b = new StringBuffer();
        for (int i = 0; i < len; ++i) {
            char c = s.charAt(i);
            if (c == '+') {
                c = ' ';
            } else if ((c == '%') && (i + 2 < len)) {
                int d = JSONTokener.dehexchar(s.charAt(i + 1));
                int e = JSONTokener.dehexchar(s.charAt(i + 2));
                if ((d >= 0) && (e >= 0)) {
                    c = (char) (d * 16 + e);
                    i += 2;
        return b.toString();
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