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/* InvalidClassException.java -- deserializing a class failed

   Copyright (C) 1998, 2002 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.io;

/**

 * This exception is thrown when there is some sort of problem with a

 * class during a serialization operation.  This could be:<br><ul>

 * <li>the serial version of the class doesn't match</li>

 * <li>the class contains unknown datatypes</li>

 * <li>the class does not have an accessible no-arg constructor</li>

 * </ul>.

 *

 * <p>The field <code>classname</code> will contain the name of the

 * class that caused the problem if known.  The getMessage() method

 * for this exception will always include the name of that class

 * if known.

 *

 * @author Aaron M. Renn (arenn@urbanophile.com)

 * @since 1.1

 * @status updated to 1.4

 */

public class InvalidClassException extends ObjectStreamException

{

  /**

   * Compatible with JDK 1.1+.

   */

  private static final long serialVersionUID = -4333316296251054416L;

  /**

   * The name of the class which encountered the error.

   *

   * @serial the classname causing the error

   */

  public String classname;

  /**

   * Create an exception with a descriptive error message, but a null

   * classname.

   *

   * @param message the descriptive error message

   */

  public InvalidClassException(String message)

  {

    super(message);

  }

  /**

   * Create an exception with a descriptive error message, and the name of

   * the class that caused the problem.

   *

   * @param classname the name of the faulty class

   * @param message the descriptive error message

   */

  public InvalidClassException(String classname, String message)

  {

    super(message);

    this.classname = classname;

  }

  /**

   * Returns the descriptive error message for this exception. It will

   * include the class name that caused the problem if known, in the format:

   * <code>[classname][; ][super.getMessage()]</code>.

   *

   * @return A descriptive error message, may be null

   */

  public String getMessage()

  {

    String msg = super.getMessage();

    if (msg == null)

      return classname;

    return (classname == null ? "" : classname + "; ") + msg;

  }

}