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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
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   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
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   *
   * 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
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   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  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);
  }
  