001    /* ServerCloneException.java -- a UnicastRemoteObject could not be cloned
002       Copyright (c) 1996, 1997, 1998, 1999, 2002 Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    package 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     */
049    public 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    }