001/* ServiceContextHelper.java --
002   Copyright (C) 2005 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package org.omg.IOP;
040
041import gnu.CORBA.Minor;
042import gnu.CORBA.OrbRestricted;
043
044import org.omg.CORBA.Any;
045import org.omg.CORBA.BAD_OPERATION;
046import org.omg.CORBA.ORB;
047import org.omg.CORBA.StructMember;
048import org.omg.CORBA.TCKind;
049import org.omg.CORBA.TypeCode;
050import org.omg.CORBA.portable.InputStream;
051import org.omg.CORBA.portable.OutputStream;
052
053/**
054* A helper operations for the structure {@link ServiceContext}.
055*
056* @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
057*/
058public abstract class ServiceContextHelper
059{
060  /**
061   * Create the ServiceContext typecode (structure, named "ServiceContext"). The
062   * typecode states that the structure contains the following fields:
063   * context_id, context_data.
064   */
065  public static TypeCode type()
066  {
067    ORB orb = OrbRestricted.Singleton;
068    StructMember[] members = new StructMember[2];
069
070    TypeCode field;
071
072    field = orb.create_alias_tc("IDL:omg.org/IOP/ServiceId:1.0", "ServiceId",
073                                orb.get_primitive_tc(TCKind.tk_ulong));
074    members[0] = new StructMember("context_id", field, null);
075
076    field = orb.create_sequence_tc(0, orb.get_primitive_tc(TCKind.tk_octet));
077    members[1] = new StructMember("context_data", field, null);
078    return orb.create_struct_tc(id(), "ServiceContext", members);
079  }
080
081  /**
082   * Insert the ServiceContext into the given Any. This method uses the
083   * ServiceContextHolder.
084   *
085   * @param any the Any to insert into.
086   * @param that the ServiceContext to insert.
087   */
088  public static void insert(Any any, ServiceContext that)
089  {
090    any.insert_Streamable(new ServiceContextHolder(that));
091  }
092
093  /**
094   * Extract the ServiceContext from given Any.
095   * This method uses the ServiceContextHolder.
096   *
097   * @throws BAD_OPERATION if the passed Any does not contain ServiceContext.
098   */
099  public static ServiceContext extract(Any any)
100  {
101    try
102      {
103        return ((ServiceContextHolder) any.extract_Streamable()).value;
104      }
105    catch (ClassCastException cex)
106      {
107        BAD_OPERATION bad = new BAD_OPERATION("ServiceContext expected");
108        bad.minor = Minor.Any;
109        bad.initCause(cex);
110        throw bad;
111      }
112  }
113
114  /**
115   * Get the ServiceContext repository id.
116   *
117   * @return "IDL:omg.org/IOP/ServiceContext:1.0", always.
118   */
119  public static String id()
120  {
121    return "IDL:omg.org/IOP/ServiceContext:1.0";
122  }
123
124  /**
125   * Read the context from the CDR intput stream (first id, then
126   * data as a flexible length byte sequence).
127   *
128   * @param input a org.omg.CORBA.portable stream to read from.
129   */
130  public static ServiceContext read(InputStream input)
131  {
132    ServiceContext value = new ServiceContext();
133    value.context_id = input.read_long();
134    value.context_data = new byte[ input.read_long() ];
135    for (int i0 = 0; i0 < value.context_data.length; i0++)
136      value.context_data [ i0 ] = input.read_octet();
137    return value;
138  }
139
140  /**
141   * Write the context to the CDR output stream (first id, then
142   * data as a flexible length byte sequence).
143   *
144   * @param output a org.omg.CORBA.portable stream stream to write into.
145   * @param value a value to write.
146   */
147  public static void write(OutputStream output, ServiceContext value)
148  {
149    output.write_long(value.context_id);
150    output.write_long(value.context_data.length);
151    for (int i0 = 0; i0 < value.context_data.length; i0++)
152      output.write_octet(value.context_data [ i0 ]);
153  }
154}