Code Snips

Some times it is necessary to flatten a map into a string. For example when trying to log a servlet request onto a single log line without loosing too much info. In this case each value is an array of strings. So here it is, short and effective. Enjoy!

  private String mapToString(Map map) {

    StringBuffer buffer = new StringBuffer();
    Iterator it = map.keySet().iterator();

    while (it.hasNext()) {

      String key = (String) it.next();
      String[] value = (String[]) map.get(key);
      buffer.append(key + "=");

      for (int c = 0; c < value.length; c++) {

        buffer.append("[" + value[c] + "]");
      }

      if (it.hasNext()) {

        buffer.append(":");
      }

    }

    return buffer.toString();
  }