/*
 * Copyright (C) 2006-2008 Alfresco Software Limited.
 *
 * This program 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.

 * 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */

package org.alfresco.jlan.server.auth.kerberos;

import org.alfresco.jlan.server.auth.asn.DERGeneralString;
import org.alfresco.jlan.server.auth.asn.DERInteger;
import org.alfresco.jlan.server.auth.asn.DERObject;
import org.alfresco.jlan.server.auth.asn.DERSequence;
import org.alfresco.jlan.util.StringList;

/**
 * Kerberos Principal Name Class
 * 
 * @author gkspencer
 */
public class PrincipalName {

	// Name type and naem string(s)
	
	private int m_type;
	private StringList m_names;
	
	/**
	 * Default constructor
	 */
	public PrincipalName()
	{
		m_names = new StringList();
	}
	
	/**
	 * Class constructor
	 * 
	 * @param typ int
	 * @param names StringList
	 */
	public PrincipalName(int typ, StringList names)
	{
		m_type  = typ;
		m_names = names;
	}
	
	/**
	 * Return the name type
	 * 
	 * @return int
	 */
	public final int getType()
	{
		return m_type;
	}
	
	/**
	 * Return the name list
	 * 
	 * @return StringList
	 */
	public final StringList getNames()
	{
		return m_names;
	}
	
	/**
	 * Parse an ASN.1 principal name
	 * 
	 * @param derSeq DERSequence
	 */
	public final void parsePrincipalName( DERSequence derSeq)
	{
		// Allocate the name list
		
		m_names = new StringList();
		
		// Enumerate the sequence
	
		for ( int idx = 0; idx < derSeq.numberOfObjects(); idx++)
		{
			// Read an object
		
			DERObject derObj = (DERObject) derSeq.getObjectAt(idx);
			
			if ( derObj != null && derObj.isTagged())
			{
				switch ( derObj.getTagNo())
				{
					// Type
					
					case 0:
						if ( derObj instanceof DERInteger)
						{
							DERInteger derInt = (DERInteger) derObj;
							m_type = (int) derInt.getValue();
						}
						break;
						
					// Principal name components
						
					case 1:
						if ( derObj instanceof DERSequence)
						{
							DERSequence derNames = (DERSequence) derObj;
							
							for( int namIdx = 0; namIdx < derNames.numberOfObjects(); namIdx++)
							{
								DERGeneralString derStr = (DERGeneralString) derNames.getObjectAt(namIdx);
								m_names.addString( derStr.getValue());
							}
						}
				}
			}
		}
	}
	
	/**
	 * Return the principal name as a string
	 * 
	 * @return String
	 */
	public String toString()
	{
		StringBuilder str = new StringBuilder();
		
		str.append("[Typ=");
		str.append(getType());
		str.append(",Names=");
		
		if ( m_names != null)
			str.append(m_names);
		else
			str.append("null");
		str.append("]");
		
		return str.toString();
	}
}