001    /* IDLTypeHelper.java --
002       Copyright (C) 2005 Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package org.omg.CORBA;
040    
041    import gnu.CORBA.OrbRestricted;
042    
043    import org.omg.CORBA.portable.Delegate;
044    import org.omg.CORBA.portable.InputStream;
045    import org.omg.CORBA.portable.ObjectImpl;
046    import org.omg.CORBA.portable.OutputStream;
047    
048    /**
049     * A helper operations for the IDL type.
050     *
051     * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
052     */
053    public abstract class IDLTypeHelper
054    {
055      /**
056       * Insert the IDL type into the given Any.
057       */
058      public static void insert(Any a, IDLType that)
059      {
060        OutputStream out = a.create_output_stream();
061        a.type(type());
062        write(out, that);
063        a.read_value(out.create_input_stream(), type());
064      }
065    
066      /**
067       * Extract the IDL type from the given Any.
068       */
069      public static IDLType extract(Any a)
070      {
071        return read(a.create_input_stream());
072      }
073    
074      /**
075       * Get the typecode of the IDL type (the interface typecode, name "IDLType").
076       */
077      public static TypeCode type()
078      {
079        return OrbRestricted.Singleton.create_interface_tc(IDLTypeHelper.id(),
080                                                           "IDLType");
081      }
082    
083      /**
084       * Return the IDLType repository id.
085       *
086       * @return "IDL:omg.org/CORBA/IDLType:1.0", always.
087       */
088      public static String id()
089      {
090        return "IDL:omg.org/CORBA/IDLType:1.0";
091      }
092    
093      /**
094       * Read the IDL type from the given input stream.
095       * The method reads an object and narrows into IDL type using this
096       * helper.
097       */
098      public static IDLType read(InputStream istream)
099      {
100        return narrow(istream.read_Object());
101      }
102    
103      /**
104       * Write the IDL type to the output stream (as CORBA object).
105       */
106      public static void write(OutputStream ostream, IDLType value)
107      {
108        ostream.write_Object((org.omg.CORBA.Object) value);
109      }
110    
111      /**
112       * Narrows the CORBA object into the IDL type.
113       */
114      public static IDLType narrow(org.omg.CORBA.Object obj)
115      {
116        if (obj == null)
117          return null;
118        else if (obj instanceof IDLType)
119          return (IDLType) obj;
120        else if (!obj._is_a(id()))
121          throw new org.omg.CORBA.BAD_PARAM();
122        else
123          {
124            Delegate delegate = ((ObjectImpl) obj)._get_delegate();
125            return new _IDLTypeStub(delegate);
126          }
127      }
128    }