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Diffstat (limited to 'libjava/classpath/gnu/CORBA/bufferedResponseHandler.java')
-rw-r--r-- | libjava/classpath/gnu/CORBA/bufferedResponseHandler.java | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/CORBA/bufferedResponseHandler.java b/libjava/classpath/gnu/CORBA/bufferedResponseHandler.java new file mode 100644 index 00000000000..e7f00baebe2 --- /dev/null +++ b/libjava/classpath/gnu/CORBA/bufferedResponseHandler.java @@ -0,0 +1,187 @@ +/* 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)); + } +} |