/*
 * 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 java.util.List;

import sun.security.util.*;

/**
 * Represents the Freshest CRL Extension.
 *
 * <p>
 * The extension identifies how delta CRL information for a
 * complete CRL is obtained.
 *
 * <p>
 * The extension is defined in Section 5.2.6 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-freshestCRL OBJECT IDENTIFIER ::=  { id-ce 46 }
 *
 *     FreshestCRL ::= CRLDistributionPoints
 * </pre>
 *
 * @since 1.6
 */
public class FreshestCRLExtension extends CRLDistributionPointsExtension {

    /**
     * Attribute name.
     */
    public static final String NAME = "FreshestCRL";

    /**
     * Creates a freshest CRL extension.
     * The criticality is set to false.
     *
     * @param distributionPoints the list of delta CRL distribution points.
     */
    public FreshestCRLExtension(List<DistributionPoint> distributionPoints)
        throws IOException {

        super(PKIXExtensions.FreshestCRL_Id, false, distributionPoints, NAME);
    }

    /**
     * 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 IOException on decoding error.
     */
    public FreshestCRLExtension(Boolean critical, Object value)
    throws IOException {
        super(PKIXExtensions.FreshestCRL_Id, critical.booleanValue(), value,
            NAME);
    }

    /**
     * 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 {
        super.encode(out, PKIXExtensions.FreshestCRL_Id, false);
    }
}