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  package java.security.cert;
  
  /**
   * A selector that defines a set of criteria for selecting {@code CRL}s.
   * Classes that implement this interface are often used to specify
   * which {@code CRL}s should be retrieved from a {@code CertStore}.
   * <p>
   * <b>Concurrent Access</b>
   * <p>
   * Unless otherwise specified, the methods defined in this interface are not
   * thread-safe. Multiple threads that need to access a single
   * object concurrently should synchronize amongst themselves and
   * provide the necessary locking. Multiple threads each manipulating
   * separate objects need not synchronize.
   *
   * @see CRL
   * @see CertStore
   * @see CertStore#getCRLs
   *
   * @author      Steve Hanna
   * @since       1.4
   */
  public interface CRLSelector extends Cloneable {
  
      /**
       * Decides whether a {@code CRL} should be selected.
       *
       * @param   crl     the {@code CRL} to be checked
       * @return  {@code true} if the {@code CRL} should be selected,
       * {@code false} otherwise
       */
      boolean match(CRL crl);
  
      /**
       * Makes a copy of this {@code CRLSelector}. Changes to the
       * copy will not affect the original and vice versa.
       *
       * @return a copy of this {@code CRLSelector}
       */
      Object clone();
  }
  