content: /*
   * Copyright (c) 2012, Oracle and/or its affiliates. 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.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle 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
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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;
  
  /**
   * <p>Performs one or more checks on each {@code Certificate} of a
   * {@code CertPath}.
   *
   * <p>A {@code CertPathChecker} implementation is typically created to extend
   * a certification path validation algorithm. For example, an implementation
   * may check for and process a critical private extension of each certificate
   * in a certification path.
   *
   * @since 1.8
   */
  public interface CertPathChecker {
  
      /**
       * Initializes the internal state of this {@code CertPathChecker}.
       *
       * <p>The {@code forward} flag specifies the order that certificates will
       * be passed to the {@link #check check} method (forward or reverse).
       *
       * @param forward the order that certificates are presented to the
       *        {@code check} method. If {@code true}, certificates are
       *        presented from target to trust anchor (forward); if
       *        {@code false}, from trust anchor to target (reverse).
       * @throws CertPathValidatorException if this {@code CertPathChecker} is
       *         unable to check certificates in the specified order
       */
      void init(boolean forward) throws CertPathValidatorException;
  
      /**
       * Indicates if forward checking is supported. Forward checking refers
       * to the ability of the {@code CertPathChecker} to perform its checks
       * when certificates are presented to the {@code check} method in the
       * forward direction (from target to trust anchor).
       *
       * @return {@code true} if forward checking is supported, {@code false}
       *         otherwise
       */
      boolean isForwardCheckingSupported();
  
      /**
       * Performs the check(s) on the specified certificate using its internal
       * state. The certificates are presented in the order specified by the
       * {@code init} method.
       *
       * @param cert the {@code Certificate} to be checked
       * @throws CertPathValidatorException if the specified certificate does
       *         not pass the check
       */
      void check(Certificate cert) throws CertPathValidatorException;
  }
  