/*
    * Copyright (C) 2013 4th Line GmbH, Switzerland
    *
    * The contents of this file are subject to the terms of either the GNU
    * Lesser General Public License Version 2 or later ("LGPL") or the
    * Common Development and Distribution License Version 1 or later
    * ("CDDL") (collectively, the "License"). You may not use this file
    * except in compliance with the License. See LICENSE.txt for more
    * information.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   */
  
  package org.fourthline.cling.model.message.header;
  
  import org.fourthline.cling.model.Constants;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  import java.util.Locale;
  
  /**
   * @author Christian Bauer
   */
  public class MaxAgeHeader extends UpnpHeader<Integer> {
  
      // UDA 1.1 expands on the rules in UDA 1.0 and clearly says that anything but max-age has to be ignored
      public static final Pattern MAX_AGE_REGEX = Pattern.compile(".*max-age\\s*=\\s*([0-9]+).*");
  
      public MaxAgeHeader(Integer maxAge) {
          setValue(maxAge);
      }
  
      public MaxAgeHeader() {
          setValue(Constants.MIN_ADVERTISEMENT_AGE_SECONDS);
      }
  
      public void setString(String s) throws InvalidHeaderException {
  
          Matcher matcher = MAX_AGE_REGEX.matcher(s.toLowerCase(Locale.ROOT));
          if (!matcher.matches()){
              throw new InvalidHeaderException("Invalid cache-control value, can't parse max-age seconds: " + s);
          }
  
          Integer maxAge = Integer.parseInt(matcher.group(1));
          setValue(maxAge);
      }
  
      public String getString() {
          return "max-age="+getValue().toString();
      }
  }