Source for org.omg.IOP.ServiceContextHelper

   1: /* ServiceContextHelper.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 org.omg.IOP;
  40: 
  41: import gnu.CORBA.Minor;
  42: 
  43: import org.omg.CORBA.Any;
  44: import org.omg.CORBA.BAD_OPERATION;
  45: import org.omg.CORBA.ORB;
  46: import org.omg.CORBA.StructMember;
  47: import org.omg.CORBA.TCKind;
  48: import org.omg.CORBA.TypeCode;
  49: import org.omg.CORBA.portable.InputStream;
  50: import org.omg.CORBA.portable.OutputStream;
  51: 
  52: /**
  53: * A helper operations for the structure {@link ServiceContext}.
  54: *
  55: * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  56: */
  57: public abstract class ServiceContextHelper
  58: {
  59:   /**
  60:    * The cached typecode value, computed only once.
  61:    */
  62:   private static TypeCode typeCode;
  63: 
  64:   /**
  65:    * Create the ServiceContext typecode (structure,
  66:    * named "ServiceContext").
  67:    * The typecode states that the structure contains the
  68:    * following fields: context_id, context_data.
  69:    */
  70:   public static TypeCode type()
  71:   {
  72:     if (typeCode == null)
  73:       {
  74:         ORB orb = ORB.init();
  75:         StructMember[] members = new StructMember[ 2 ];
  76: 
  77:         TypeCode field;
  78: 
  79:         field =
  80:           orb.create_alias_tc("IDL:omg.org/IOP/ServiceId:1.0", "ServiceId",
  81:                               orb.get_primitive_tc(TCKind.tk_ulong)
  82:                              );
  83:         members [ 0 ] = new StructMember("context_id", field, null);
  84: 
  85:         field =
  86:           orb.create_sequence_tc(0, orb.get_primitive_tc(TCKind.tk_octet));
  87:         members [ 1 ] = new StructMember("context_data", field, null);
  88:         typeCode = orb.create_struct_tc(id(), "ServiceContext", members);
  89:       }
  90:     return typeCode;
  91:   }
  92: 
  93:   /**
  94:   * Insert the ServiceContext into the given Any.
  95:   * This method uses the ServiceContextHolder.
  96:   *
  97:   * @param any the Any to insert into.
  98:   * @param that the ServiceContext to insert.
  99:   */
 100:   public static void insert(Any any, ServiceContext that)
 101:   {
 102:     any.insert_Streamable(new ServiceContextHolder(that));
 103:   }
 104: 
 105:   /**
 106:    * Extract the ServiceContext from given Any.
 107:    * This method uses the ServiceContextHolder.
 108:    *
 109:    * @throws BAD_OPERATION if the passed Any does not contain ServiceContext.
 110:    */
 111:   public static ServiceContext extract(Any any)
 112:   {
 113:     try
 114:       {
 115:         return ((ServiceContextHolder) any.extract_Streamable()).value;
 116:       }
 117:     catch (ClassCastException cex)
 118:       {
 119:         BAD_OPERATION bad = new BAD_OPERATION("ServiceContext expected");
 120:         bad.minor = Minor.Any;        
 121:         bad.initCause(cex);
 122:         throw bad;
 123:       }
 124:   }
 125: 
 126:   /**
 127:    * Get the ServiceContext repository id.
 128:    *
 129:    * @return "IDL:omg.org/IOP/ServiceContext:1.0", always.
 130:    */
 131:   public static String id()
 132:   {
 133:     return "IDL:omg.org/IOP/ServiceContext:1.0";
 134:   }
 135: 
 136:   /**
 137:    * Read the context from the CDR intput stream (first id, then
 138:    * data as a flexible length byte sequence).
 139:    *
 140:    * @param input a org.omg.CORBA.portable stream to read from.
 141:    */
 142:   public static ServiceContext read(InputStream input)
 143:   {
 144:     ServiceContext value = new ServiceContext();
 145:     value.context_id = input.read_long();
 146:     value.context_data = new byte[ input.read_long() ];
 147:     for (int i0 = 0; i0 < value.context_data.length; i0++)
 148:       value.context_data [ i0 ] = input.read_octet();
 149:     return value;
 150:   }
 151: 
 152:   /**
 153:    * Write the context to the CDR output stream (first id, then
 154:    * data as a flexible length byte sequence).
 155:    *
 156:    * @param output a org.omg.CORBA.portable stream stream to write into.
 157:    * @param value a value to write.
 158:    */
 159:   public static void write(OutputStream output, ServiceContext value)
 160:   {
 161:     output.write_long(value.context_id);
 162:     output.write_long(value.context_data.length);
 163:     for (int i0 = 0; i0 < value.context_data.length; i0++)
 164:       output.write_octet(value.context_data [ i0 ]);
 165:   }