gomp-20050608-branch/libjava/classpath/gnu/CORBA/EmptyExceptionHolder.java

   1 /* EmptyStructHolder.java --
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.CORBA;
  40
  41 import org.omg.CORBA.BAD_OPERATION;
  42 import org.omg.CORBA.NO_IMPLEMENT;
  43 import org.omg.CORBA.TypeCode;
  44 import org.omg.CORBA.UNKNOWN;
  45 import org.omg.CORBA.UnknownUserException;
  46 import org.omg.CORBA.portable.InputStream;
  47 import org.omg.CORBA.portable.OutputStream;
  48 import org.omg.CORBA.portable.Streamable;
  49
  50 /**
  51  * This holder can store any CORBA exception that has no user defined fields.
  52  * Only the repository ID is written when the method {@link #_write} is called.
  53  * The _read method is not supported for this holder.
  54  *
  55  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  56  */
  57 public class EmptyExceptionHolder
  58   implements Streamable
  59 {
  60   /**
  61    * The wrapped exception.
  62    */
  63   public Throwable value;
  64
  65   /**
  66    * The typecode of the wrapped exception.
  67    */
  68   public TypeCode typecode;
  69
  70   /**
  71    * Create the exception holder, initialised to the given values.
  72    *
  73    * @param an_exception the wrapped exception.
  74    * @param an_id the exception repository id.
  75    */
  76   public EmptyExceptionHolder(Throwable an_exception, TypeCode a_typecode)
  77   {
  78     value = an_exception;
  79     typecode = a_typecode;
  80   }
  81
  82   /**
  83    * Reads the exception from the input stream.
  84    *
  85    * The value field obtains the value of either the read exception or
  86    * the UNKNOWN if the repository ID does not match
  87    * the exception from the reachable code.
  88    */
  89   public void _read(InputStream input)
  90   {
  91     String id = input.read_string();
  92     Object ex = ObjectCreator.Idl2Object(id);
  93     if (ex == null)
  94       value = new UNKNOWN(id);
  95     else
  96       value = (Throwable) ex;
  97   }
  98
  99   /**
 100    * Return the typecode of the stored exception.
 101    *
 102    * @return the value, passed as a_typecode in constructor.
 103    */
 104   public TypeCode _type()
 105   {
 106     return typecode;
 107   }
 108
 109   /**
 110    * Write the exception into the give output stream. Writes the
 111    * repository id that is taken from the typecode. This method also
 112    * works when no helper class is available.
 113    *
 114    * @param output a stream to write into.
 115    *
 116    * @throws BAD_OPERATION if the value for the holder is not set or
 117    * the typecode cannot provide repository id.
 118    */
 119   public void _write(OutputStream output)
 120   {
 121     try
 122       {
 123         output.write_string(typecode.id());
 124       }
 125     catch (Exception ex)
 126       {
 127         BAD_OPERATION bad = new BAD_OPERATION();
 128         bad.minor = Minor.CDR;
 129         bad.initCause(ex);
 130         throw bad;
 131       }
 132   }
 133 }