/*
 * Copyright 1998-2006 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 java.security.cert;

/**
 * This class is an abstraction of certificate revocation lists (CRLs) that
 * have different formats but important common uses. For example, all CRLs
 * share the functionality of listing revoked certificates, and can be queried
 * on whether or not they list a given certificate.
 * <p>
 * Specialized CRL types can be defined by subclassing off of this abstract
 * class.
 *
 * @author Hemma Prafullchandra
 *
 *
 * @see X509CRL
 * @see CertificateFactory
 *
 * @since 1.2
 */

public abstract class CRL {

    // the CRL type
    private String type;

    /**
     * Creates a CRL of the specified type.
     *
     * @param type the standard name of the CRL type.
     * See Appendix A in the <a href=
     * "../../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
     * Java Cryptography Architecture API Specification &amp; Reference </a>
     * for information about standard CRL types.
     */
    protected CRL(String type) {
        this.type = type;
    }

    /**
     * Returns the type of this CRL.
     *
     * @return the type of this CRL.
     */
    public final String getType() {
        return this.type;
    }

    /**
     * Returns a string representation of this CRL.
     *
     * @return a string representation of this CRL.
     */
    public abstract String toString();

    /**
     * Checks whether the given certificate is on this CRL.
     *
     * @param cert the certificate to check for.
     * @return true if the given certificate is on this CRL,
     * false otherwise.
     */
    public abstract boolean isRevoked(Certificate cert);
}