/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * 
 * This file is part of MjSip (http://www.mjsip.org)
 * 
 * MjSip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * MjSip 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 * Nitin Khanna, Hughes Systique Corp. (Reason: Android specific change, optmization, bug fix) 
 */

package org.zoolu.sip.header;

import org.zoolu.tools.Parser;
import java.util.Vector;

/** Generic SIP Header containing a list of tokens (Strings). */
public abstract class ListHeader extends Header {
	public ListHeader(String hname, String hvalue) {
		super(hname, hvalue);
	}

	public ListHeader(Header hd) {
		super(hd);
	}

	/** Gets list of tokens (as Vector of Strings). */
	public Vector<String> getElements() {
		Vector<String> elements = new Vector<String>();
		Parser par = new Parser(value);
		char[] delim = { ',' };
		while (par.hasMore()) {
			String elem = par.getWord(delim).trim();
			if (elem != null && elem.length() > 0)
				elements.addElement(elem);
			par.skipChar();
		}
		return elements;
	}

	/** Sets the list of tokens. */
	public void setElements(Vector<String> elements) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < elements.size(); i++) {
			if (i > 0)
				sb.append(", ");
			sb.append((String) elements.elementAt(i));
		}
		value = sb.toString();
	}

	/** Adds a new token to the elements list. */
	public void addElement(String elem) {
		if (value == null || value.length() == 0)
			value = elem;
		else
			value += ", " + elem;
	}
}
