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+/* EmptyStructHolder.java --
+ Copyright (C) 2005 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 gnu.CORBA;
+
+import org.omg.CORBA.BAD_OPERATION;
+import org.omg.CORBA.TypeCode;
+import org.omg.CORBA.UNKNOWN;
+import org.omg.CORBA.portable.InputStream;
+import org.omg.CORBA.portable.OutputStream;
+import org.omg.CORBA.portable.Streamable;
+
+/**
+ * This holder can store any CORBA exception that has no user defined fields.
+ * Only the repository ID is written when the method {@link #_write} is called.
+ * The _read method is not supported for this holder.
+ *
+ * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
+ */
+public class EmptyExceptionHolder
+ implements Streamable
+{
+ /**
+ * The wrapped exception.
+ */
+ public Throwable value;
+
+ /**
+ * The typecode of the wrapped exception.
+ */
+ public TypeCode typecode;
+
+ /**
+ * Create the exception holder, initialised to the given values.
+ *
+ * @param an_exception the wrapped exception.
+ * @param an_id the exception repository id.
+ */
+ public EmptyExceptionHolder(Throwable an_exception, TypeCode a_typecode)
+ {
+ value = an_exception;
+ typecode = a_typecode;
+ }
+
+ /**
+ * Reads the exception from the input stream.
+ *
+ * The value field obtains the value of either the read exception or
+ * the UNKNOWN if the repository ID does not match
+ * the exception from the reachable code.
+ */
+ public void _read(InputStream input)
+ {
+ String id = input.read_string();
+ Object ex = ObjectCreator.Idl2Object(id);
+ if (ex == null)
+ value = new UNKNOWN(id);
+ else
+ value = (Throwable) ex;
+ }
+
+ /**
+ * Return the typecode of the stored exception.
+ *
+ * @return the value, passed as a_typecode in constructor.
+ */
+ public TypeCode _type()
+ {
+ return typecode;
+ }
+
+ /**
+ * Write the exception into the give output stream. Writes the
+ * repository id that is taken from the typecode. This method also
+ * works when no helper class is available.
+ *
+ * @param output a stream to write into.
+ *
+ * @throws BAD_OPERATION if the value for the holder is not set or
+ * the typecode cannot provide repository id.
+ */
+ public void _write(OutputStream output)
+ {
+ try
+ {
+ output.write_string(typecode.id());
+ }
+ catch (Exception ex)
+ {
+ BAD_OPERATION bad = new BAD_OPERATION();
+ bad.minor = Minor.CDR;
+ bad.initCause(ex);
+ throw bad;
+ }
+ }
+}