Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* bufferedResponseHandler.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 gnu.CORBA.CDR.cdrBufOutput;
+import gnu.CORBA.GIOP.MessageHeader;
+import gnu.CORBA.GIOP.ReplyHeader;
+import gnu.CORBA.GIOP.cxCodeSet;
+
+import org.omg.CORBA.ORB;
+import org.omg.CORBA.portable.OutputStream;
+import org.omg.CORBA.portable.ResponseHandler;
+
+/**
+ * Provides the CDR output streams for writing the response to the given
+ * buffer.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+class bufferedResponseHandler
+  implements ResponseHandler
+{
+  /**
+   * The message header.
+   * This field is used to compute the size and alignments.
+   * It is, however, never directly written to the buffer stream.
+   */
+  final MessageHeader message_header;
+
+  /**
+   * The associated orb.
+   */
+  final ORB orb;
+
+  /**
+   * The reply header. This field is used to compute the size and alignments.
+   * It is, however, never directly written to the buffer stream.
+   */
+  final ReplyHeader reply_header;
+
+  /**
+   * True if the stream was obtained by invoking {@link #createExceptionReply()},
+   * false otherwise.
+   */
+  private boolean exceptionReply;
+
+  /**
+   * The buffer to write into.
+   */
+  private cdrBufOutput buffer;
+
+  /**
+   * Create a new buffered response handler that uses the given message
+   * headers. The headers are used to compute sizes and check the versions.
+   * They are not written into a stream inside this class.
+   *
+   * @param m_header a message header.
+   * @param r_header a reply header.
+   */
+  bufferedResponseHandler(ORB an_orb, MessageHeader m_header,
+                          ReplyHeader r_header
+                         )
+  {
+    message_header = m_header;
+    reply_header = r_header;
+    orb = an_orb;
+    prepareStream();
+  }
+
+  /**
+   * Get an output stream for providing details about the exception.
+   * Before returning the stream, the handler automatically writes
+   * the message header and the reply about exception header,
+   * but not the message header.
+   *
+   * @return the stream to write exception details into.
+   */
+  public OutputStream createExceptionReply()
+  {
+    exceptionReply = true;
+    prepareStream();
+    return buffer;
+  }
+
+  /**
+   * Get an output stream for writing a regular reply (not an exception).
+   *
+   * Before returning the stream, the handler automatically writes
+   * the regular reply header, but not the message header.
+   *
+   * @return the output stream for writing a regular reply.
+   */
+  public OutputStream createReply()
+  {
+    exceptionReply = false;
+    prepareStream();
+    reply_header.reply_status = ReplyHeader.NO_EXCEPTION;
+    return buffer;
+  }
+
+  /**
+   * Get the buffer, normally containing the written reply.
+   * The reply includes the reply header (or the exception header)
+   * but does not include the message header.
+   *
+   * The stream buffer can also be empty if no data have been written
+   * into streams, returned by {@link #createReply()} or
+   * {@link #createExceptionReply()}.
+   *
+   * @return the CDR output stream, containing the written output.
+   */
+  cdrBufOutput getBuffer()
+  {
+    return buffer;
+  }
+
+  /**
+   * True if the stream was obtained by invoking
+   * {@link #createExceptionReply()}, false otherwise
+   * (usually no-exception reply).
+   */
+  boolean isExceptionReply()
+  {
+    return exceptionReply;
+  }
+
+  /**
+   * Compute the header offset, set the correct version number and codeset.
+   */
+  private void prepareStream()
+  {
+    buffer = new cdrBufOutput();
+    buffer.setOrb(orb);
+    buffer.setOffset(message_header.getHeaderSize());
+
+    // Get the position after the reply header would be written.
+    reply_header.write(buffer);
+
+    int new_offset = message_header.getHeaderSize() + buffer.buffer.size();
+
+    buffer.buffer.reset();
+    buffer.setOffset(new_offset);
+
+    if (message_header.version.since_inclusive(1, 2))
+      buffer.align(8);
+
+    buffer.setVersion(message_header.version);
+
+    buffer.setCodeSet(cxCodeSet.find(reply_header.service_context));
+  }
+}