/*
 * Copyright (C) 2010 Teleal GmbH, Switzerland
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * 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.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.teleal.cling.model.message.header;

import org.teleal.cling.model.Constants;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @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());
        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();
    }
}
