UPMT-master/java/upmt/src/org/zoolu/sip/header/ListHeader.java
/*
 * 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)
 */

package org.zoolu.sip.header;


import java.util.Vector;

import org.zoolu.tools.Parser;


/** 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 getElements()
   {  Vector elements=new Vector();
      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 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;
   }
}
