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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
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 * accompanied this code).
 *
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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 IOException using the getCause() method. 
See Also:
DirectoryStream
Since:
1.7/**
 * 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.
Params:
cause –  the IOException that caused the directory iteration to fail
Throws:
NullPointerException –  if the cause is null/**
     * 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.
Returns:
 the 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 IOException/**
     * 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");
    }
}