gomp-20050608-branch/libjava/classpath/gnu/CORBA/CDR/EncapsulationStream.java

   1 /* EncapsulationOutput.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.CDR;
  40
  41 import java.io.IOException;
  42
  43 /**
  44  * The encapsulated data, as they are defined by CORBA specification.
  45  * This includes the extra 0 byte (Big endian) in the beginning.
  46  * When written to the parent steam, the encapsulated data are preceeded
  47  * by the data length in bytes.
  48  *
  49  * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
  50  */
  51 public class EncapsulationStream
  52   extends AbstractCdrOutput
  53 {
  54   /**
  55    * The Big Endian (most siginificant byte first flag).
  56    */
  57   public static final byte BIG_ENDIAN = 0;
  58
  59   /**
  60    * The Little Endian (least siginificant byte first flag).
  61    */
  62   public static final byte LITTLE_ENDIAN = 1;
  63
  64   /**
  65    * The byte buffer.
  66    */
  67   public final AligningOutput buffer;
  68
  69   /**
  70    * The stream, where the data are being encapsulated.
  71    */
  72   public final org.omg.CORBA.portable.OutputStream parent;
  73
  74   /**
  75    * Create the EncapsulationOutput with the given parent stream
  76    * and the specified encoding.
  77    */
  78   public EncapsulationStream(org.omg.CORBA.portable.OutputStream _parent,
  79                             boolean use_big_endian)
  80   {
  81     super();
  82     buffer = new AligningOutput();
  83     setOutputStream(buffer);
  84     parent = _parent;
  85     write(use_big_endian?BIG_ENDIAN:LITTLE_ENDIAN);
  86   }
  87
  88   /**
  89    * Set the alignment offset, if the index of the first byte in the
  90    * stream is different from 0.
  91    */
  92   public void setOffset(int an_offset)
  93   {
  94     buffer.setOffset(an_offset);
  95   }
  96
  97   /**
  98    * Align the curretn position at the given natural boundary.
  99    */
 100   public void align(int boundary)
 101   {
 102     buffer.align(boundary);
 103   }
 104
 105   /**
 106    * Writes the content of the encapsulated output into the parent
 107    * buffer.
 108    */
 109   public void close()
 110   {
 111     try
 112       {
 113         parent.write_long(buffer.size());
 114         buffer.writeTo(parent);
 115       }
 116     catch (IOException ex)
 117       {
 118         InternalError err = new InternalError();
 119         err.initCause(ex);
 120         throw err;
 121       }
 122   }
 123
 124   /**
 125    * Return the input stream that reads the previously written values.
 126    */
 127   public org.omg.CORBA.portable.InputStream create_input_stream()
 128   {
 129     BufferredCdrInput in = new BufferredCdrInput(buffer.toByteArray());
 130     in.setOrb(orb);
 131
 132     in.setVersion(giop);
 133     in.setCodeSet(getCodeSet());
 134
 135     return in;
 136   }
 137
 138   /**
 139    * Resets (clears) the buffer.
 140    */
 141   public void reset()
 142   {
 143     buffer.reset();
 144     setOutputStream(buffer);
 145   }
 146 }