001/* ServerCloneException.java -- a UnicastRemoteObject could not be cloned
002   Copyright (c) 1996, 1997, 1998, 1999, 2002 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038package java.rmi.server;
039
040/**
041 * Thrown if a remote exception occurs during the cloning process of a
042 * <code>UnicastRemoteObject</code>.
043 *
044 * @author unknown
045 * @see UnicastRemoteObject#clone()
046 * @since 1.1
047 * @status updated to 1.4
048 */
049public class ServerCloneException extends CloneNotSupportedException
050{
051  /**
052   * Compatible with JDK 1.1+.
053   */
054  private static final long serialVersionUID = 6617456357664815945L;
055
056  /**
057   * The cause of this exception. This pre-dates the exception chaining
058   * of Throwable; and although you can change this field, you are wiser
059   * to leave it alone.
060   *
061   * @serial the exception cause
062   */
063  public Exception detail;
064
065  /**
066   * Create an exception with a message.
067   *
068   * @param s the message
069   */
070  public ServerCloneException(String s)
071  {
072    this(s, null);
073  }
074
075  /**
076   * Create an exception with a message and a cause.
077   *
078   * @param s the message
079   * @param e the cause
080   */
081  public ServerCloneException(String s, Exception e)
082  {
083    super(s);
084    initCause(e);
085    detail = e;
086  }
087
088  /**
089   * This method returns a message indicating what went wrong, in this
090   * format:
091   * <code>super.getMessage() + (detail == null ? ""
092   *    : "; nested exception is:\n\t" + detail)</code>.
093   *
094   * @return the chained message
095   */
096  public String getMessage()
097  {
098    if (detail == this || detail == null)
099      return super.getMessage();
100    return super.getMessage() + "; nested exception is:\n\t" + detail;
101  }
102
103  /**
104   * Returns the cause of this exception. Note that this may not be the
105   * original cause, thanks to the <code>detail</code> field being public
106   * and non-final (yuck). However, to avoid violating the contract of
107   * Throwable.getCause(), this returns null if <code>detail == this</code>,
108   * as no exception can be its own cause.
109   *
110   * @return the cause
111   * @since 1.4
112   */
113  public Throwable getCause()
114  {
115    return detail == this ? null : detail;
116  }
117}