content: /*
   * Copyright (c) 2010, 2011, 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
   * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package java.nio.file;
  
  import java.util.ConcurrentModificationException;
  import java.util.Objects;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.InvalidObjectException;
  
  /**
   * Runtime exception thrown if an I/O error is encountered when iterating over
   * the entries in a directory. The I/O error is retrieved as an {@link
   * IOException} using the {@link #getCause() getCause()} method.
   *
   * @since 1.7
   * @see DirectoryStream
   */
  
  public final class DirectoryIteratorException
      extends ConcurrentModificationException
  {
      private static final long serialVersionUID = -6012699886086212874L;
  
      /**
       * Constructs an instance of this class.
       *
       * @param   cause
       *          the {@code IOException} that caused the directory iteration
       *          to fail
       *
       * @throws  NullPointerException
       *          if the cause is {@code null}
       */
      public DirectoryIteratorException(IOException cause) {
          super(Objects.requireNonNull(cause));
      }
  
      /**
       * Returns the cause of this exception.
       *
       * @return  the cause
       */
      @Override
      public IOException getCause() {
          return (IOException)super.getCause();
      }
  
      /**
       * Called to read the object from a stream.
       *
       * @throws  InvalidObjectException
       *          if the object is invalid or has a cause that is not
       *          an {@code IOException}
       */
      private void readObject(ObjectInputStream s)
          throws IOException, ClassNotFoundException
      {
          s.defaultReadObject();
          Throwable cause = super.getCause();
          if (!(cause instanceof IOException))
              throw new InvalidObjectException("Cause must be an IOException");
      }
  }
  