/*

 * Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.security.x509;

import java.io.IOException;

import java.io.OutputStream;

import java.math.BigInteger;

import java.util.Enumeration;

import sun.security.util.*;

/**

 * Represents the Delta CRL Indicator Extension.

 *

 * <p>

 * The extension identifies a CRL as being a delta CRL.

 * Delta CRLs contain updates to revocation information previously distributed,

 * rather than all the information that would appear in a complete CRL.

 * The extension contains a CRL number that identifies the CRL, complete for a

 * given scope, that was used as the starting point in the generation of

 * this delta CRL.

 *

 * <p>

 * The extension is defined in Section 5.2.4 of

 * <a href="http://www.ietf.org/rfc/rfc3280.txt">Internet X.509 PKI Certific

ate and Certificate Revocation List (CRL) Profile</a>.

 *

 * <p>

 * Its ASN.1 definition is as follows:

 * <pre>

 *     id-ce-deltaCRLIndicator OBJECT IDENTIFIER ::= { id-ce 27 }

 *

 *     BaseCRLNumber ::= CRLNumber

 *     CRLNumber ::= INTEGER (0..MAX)

 * </pre>

 *

 * @since 1.6

 */

public class DeltaCRLIndicatorExtension extends CRLNumberExtension {

    /**

     * Attribute name.

     */

    public static final String NAME = "DeltaCRLIndicator";

    private static final String LABEL = "Base CRL Number";

    /**

     * Creates a delta CRL indicator extension with the integer value .

     * The criticality is set to true.

     *

     * @param crlNum the value to be set for the extension.

     */

    public DeltaCRLIndicatorExtension(int crlNum) throws IOException {

        super(PKIXExtensions.DeltaCRLIndicator_Id, true,

            BigInteger.valueOf(crlNum), NAME, LABEL);

    }

    /**

     * Creates a delta CRL indictor extension with the BigInteger value .

     * The criticality is set to true.

     *

     * @param crlNum the value to be set for the extension.

     */

    public DeltaCRLIndicatorExtension(BigInteger crlNum) throws IOException {

        super(PKIXExtensions.DeltaCRLIndicator_Id, true, crlNum, NAME, LABEL);

    }

    /**

     * Creates the extension from the passed DER encoded value of the same.

     *

     * @param critical true if the extension is to be treated as critical.

     * @param value an array of DER encoded bytes of the actual value.

     * @exception ClassCastException if value is not an array of bytes

     * @exception IOException on decoding error.

     */

    public DeltaCRLIndicatorExtension(Boolean critical, Object value)

    throws IOException {

        super(PKIXExtensions.DeltaCRLIndicator_Id, critical.booleanValue(),

            value, NAME, LABEL);

    }

    /**

     * Writes the extension to the DerOutputStream.

     *

     * @param out the DerOutputStream to write the extension to.

     * @exception IOException on encoding errors.

     */

    public void encode(OutputStream out) throws IOException {

       DerOutputStream  tmp = new DerOutputStream();

        super.encode(out, PKIXExtensions.DeltaCRLIndicator_Id, true);

    }

}