/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package javax.xml.soap;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;

/** A container for MimeHeader objects, which represent the MIME headers present
 * in a MIME part of a message. 
 * 
 * This class is used primarily when an application wants to retrieve specific
 * attachments based on certain MIME headers and values. This class will most
 * likely be used by implementations of AttachmentPart and other MIME dependent
 * parts of the SAAJ API. 

 * @author Scott.Stark@jboss.org
 * @version $Revision$
 */
public class MimeHeaders
{
   private LinkedList headers = new LinkedList();

   public MimeHeaders()
   {      
   }

   /**
    * 
    * @param name
    * @param value
    * @throws IllegalArgumentException - if name is null or empty.
    */ 
   public void addHeader(String name, String value)
      throws IllegalArgumentException
   {
      if( name == null || name.length() == 0 )
         throw new IllegalArgumentException("Invalid null or empty header name");
      MimeHeader header = new MimeHeader(name, value);
      headers.add(header);
   }

   public Iterator getAllHeaders()
   {
      return headers.iterator();
   }

   /**
    * 
    * @param name
    * @return All matching header values if found, null otherwise
    */ 
   public String[] getHeader(String name)
   {
      ArrayList tmp = new ArrayList();
      for(int n = 0; n < headers.size(); n ++)
      {
         MimeHeader mh = (MimeHeader) headers.get(n);
         if( mh.getName().equalsIgnoreCase(name) )
            tmp.add(mh.getValue());
      }
      String[] values = null;
      if( tmp.size() > 0 )
      {
         values = new String[tmp.size()];
         tmp.toArray(values);
      }
      return values;
   }

   public Iterator getMatchingHeaders(String[] names)
   {
      MatchingIter iter = new MatchingIter(headers, names, true);
      return iter;     
   }

   public Iterator getNonMatchingHeaders(String[] names)
   {
      MatchingIter iter = new MatchingIter(headers, names, false);
      return iter;      
   }

   public void removeAllHeaders()
   {
      headers.clear();
   }

   public void removeHeader(String name)
   {
      Iterator iter = headers.iterator();
      while( iter.hasNext() )
      {
         MimeHeader mh = (MimeHeader) iter.next();
         if( mh.getName().equalsIgnoreCase(name) )
            iter.remove();
      }
   }

   /** Replaces the current value of the first header entry whose name matches
    * the given name with the given value, adding a new header if no existing
    * header name matches. This method also removes all matching headers after
    * the first one.
    * 
    */  
   public void setHeader(String name, String value)
   {
      boolean didSet = false;
      for(int n = 0; n < headers.size(); n ++)
      {
         MimeHeader mh = (MimeHeader) headers.get(n);
         if( mh.getName().equalsIgnoreCase(name) )
         {
            if( didSet == true )
            {
               headers.remove(n);
               n --;
            }
            else
            {
               mh = new MimeHeader(name, value);
               headers.set(n, mh);
               didSet = true;
            }
         }
      }

      if( didSet == false )
      {
         this.addHeader(name, value);
      }
   }

   private static class MatchingIter implements Iterator
   {
      private LinkedList headers;
      private HashSet names;
      private boolean match;
      private int index;
      private MimeHeader mh;

      MatchingIter(LinkedList headers, String[] names, boolean match)
      {
         this.headers = headers;
         this.index = 0;
         this.names = new HashSet();
         for(int n = 0; n < names.length; n ++)
            this.names.add(names[n].toLowerCase());
         this.match = match;
      }

      public boolean hasNext()
      {
         boolean hasNext = index < headers.size();
         while( hasNext == true )
         {
            mh = (MimeHeader) headers.get(index);
            index ++;
            String name = mh.getName().toLowerCase();
            if( names.contains(name) == match )
               break;
            hasNext = index < headers.size();
         }
         return hasNext;
      }

      public Object next()
      {
         return mh;
      }

      public void remove()
      {
         headers.remove(index-1);
      }
   }
}
