/*************************************************************************
 *                                                                       *
 *  CERT-CVC: EAC 1.11 Card Verifiable Certificate Library               * 
 *                                                                       *
 *  This software 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 any later version.                    *
 *                                                                       *
 *  See terms of license at gnu.org.                                     *
 *                                                                       *
 *************************************************************************/
package org.ejbca.cvc;

import java.io.IOException;

/**
 * Factory for creating instances of AbstractDataField from a tag.
 * 
 * @author Keijo Kurkinen, Swedish National Police Board
 * @version $Id: FieldFactory.java 6007 2008-08-13 08:37:38Z keijox $
 *
 */
public class FieldFactory {

    /**
     * Constructs a new instance and populates it with data from the supplied
     * DER-encoded byte array.
     * 
     * @param tag
     * @param data
     * @return
     * @throws IOException
     * @throws IllegalArgumentException
     *             if the tag represents a sequence
     */
    public static AbstractDataField decodeField(CVCTagEnum tag, byte[] data) throws IOException {
	if (tag.isSequence()) {
	    throw new IllegalArgumentException("Tag " + tag + " is a sequence");
	}

	AbstractDataField fieldObject = null;
	switch (tag) {
	case EFFECTIVE_DATE:
	    fieldObject = new DateField(tag, data);
	    break;
	case EXPIRATION_DATE:
	    fieldObject = new DateField(tag, data);
	    break;
	case CA_REFERENCE:
	    fieldObject = new CAReferenceField(data);
	    break;
	case HOLDER_REFERENCE:
	    fieldObject = new HolderReferenceField(data);
	    break;
	case OID:
	    fieldObject = new OIDField(data);
	    break;
	case ROLE_AND_ACCESS_RIGHTS:
	    fieldObject = new AuthorizationField(data);
	    break;
	case PROFILE_IDENTIFIER:
	    fieldObject = new IntegerField(tag, data);
	    break;
	case COFACTOR_F:
	    fieldObject = new IntegerField(tag, data);
	    break;
	default:
	    fieldObject = new ByteField(tag, data);
	}
	return fieldObject;
    }

}