old-autovect-branch/libjava/classpath/gnu/CORBA/Poa/ServantDelegateImpl.java

   1 /* ServantDelegateImpl.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.Poa;
  40
  41 import gnu.CORBA.Unexpected;
  42
  43 import org.omg.CORBA.NO_IMPLEMENT;
  44 import org.omg.CORBA.ORB;
  45 import org.omg.CORBA.ORBPackage.InvalidName;
  46 import org.omg.CORBA.Object;
  47 import org.omg.PortableServer.CurrentPackage.NoContext;
  48 import org.omg.PortableServer.POA;
  49 import org.omg.PortableServer.POAHelper;
  50 import org.omg.PortableServer.Servant;
  51 import org.omg.PortableServer.portable.Delegate;
  52
  53 /**
  54  * The implementation of the servant delegate for the locally existing
  55  * servant.The associated servant that must also implement the
  56  * {@link InvokeHandler} interface. Each servant requires a separate
  57  * instance of this delegate and can serve a single object only.
  58  * Hence the fields are final, but the delegate is typically reused
  59  * unless the same servant is connected to different objects.
  60  *
  61  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  62  */
  63 public class ServantDelegateImpl
  64   implements Delegate
  65 {
  66   /**
  67    * The servant, associated with this object.
  68    */
  69   final Servant servant;
  70
  71   /**
  72    * The servant (not object) id.
  73    */
  74   final byte[] servant_id;
  75
  76   /**
  77    * The POA, where the servant is connected.
  78    */
  79   final gnuPOA poa;
  80
  81   /**
  82    * The object, exposed as an object, served by this servant.
  83    */
  84   final gnuServantObject object;
  85
  86   /**
  87    * Create the delegat for the servant that will be connected to the
  88    * given poa. The method is normally called from inside of gnuPOA.
  89    * The constructor sets the newly created delegate as the delegate to this
  90    * servant by calling Servant._set_delegate.
  91    *
  92    * @param a_poa the poa.
  93    * @param a_servant the servant.
  94    * @param a_servant_id the servant id.
  95    */
  96   public ServantDelegateImpl(Servant a_servant, gnuPOA a_poa, byte[] a_servant_id)
  97   {
  98     poa = a_poa;
  99     servant = a_servant;
 100     servant_id = a_servant_id;
 101     servant._set_delegate(this);
 102     object =
 103       new gnuServantObject(servant, servant_id, (ORB_1_4) servant._orb(), a_poa);
 104     object._set_delegate(new LocalDelegate(object, poa, a_servant_id));
 105   }
 106
 107   /**
 108    * Check if this object could be named by the given repository id.
 109    * @param idl_id the repository id to check.
 110    *
 111    * @return true if it is one of the possible repository ids of this
 112    * object.
 113    */
 114   public boolean is_a(Servant a_servant, String idl_id)
 115   {
 116     same(a_servant);
 117
 118     String[] maybe = object.repository_ids;
 119     if (maybe == null)
 120       maybe = servant._all_interfaces(poa, object.Id);
 121     for (int i = 0; i < maybe.length; i++)
 122       {
 123         if (maybe [ i ].equals(idl_id))
 124           return true;
 125       }
 126     return false;
 127   }
 128
 129   /**
 130    * Return the ORB's default POA.
 131    */
 132   public POA default_POA(Servant a_servant)
 133   {
 134     same(a_servant);
 135     try
 136       {
 137         return POAHelper.narrow(orb(a_servant).resolve_initial_references("RootPOA"));
 138       }
 139     catch (InvalidName ex)
 140       {
 141         throw new Unexpected(ex);
 142       }
 143   }
 144
 145   /**
 146    * Get ORB.
 147    */
 148   public ORB orb(Servant a_servant)
 149   {
 150     same(a_servant);
 151     return poa.orb();
 152   }
 153
 154   /**
 155    * Get the object, exposing the servant.
 156    */
 157   public Object this_object(Servant a_servant)
 158   {
 159     same(a_servant);
 160     try
 161       {
 162         return poa.aom.get(poa.m_orb.currents.get_object_id()).object;
 163       }
 164     catch (NoContext ex)
 165       {
 166         return object;
 167       }
 168   }
 169
 170   /**
 171    * Not supported.
 172    *
 173    * @specnote Same as for Sun up till 1.5 inclusive.
 174    */
 175   public Object get_interface_def(Servant a_servant)
 176   {
 177     same(a_servant);
 178     throw new NO_IMPLEMENT();
 179   }
 180
 181   /**
 182    * Get the Id of the object being currently served.
 183    */
 184   public byte[] object_id(Servant a_servant)
 185   {
 186     same(a_servant);
 187     try
 188       {
 189         byte[] id = poa.m_orb.currents.get_object_id();
 190         return id;
 191       }
 192     catch (NoContext ex)
 193       {
 194         return object.Id;
 195       }
 196   }
 197
 198   /**
 199    * Always returns false;
 200    */
 201   public boolean non_existent(Servant a_servant)
 202   {
 203     same(a_servant);
 204     return false;
 205   }
 206
 207   /**
 208    * Return the associated POA.
 209    */
 210   public POA poa(Servant a_servant)
 211   {
 212     same(a_servant);
 213     try
 214       {
 215         return poa.m_orb.currents.get_POA();
 216       }
 217     catch (NoContext ex)
 218       {
 219         return poa;
 220       }
 221   }
 222
 223   /**
 224    * Checks if the passed servant is the same as the servant, associated with
 225    * this delegate. This class requires a single servant per delegate.
 226    */
 227   void same(Servant some_servant)
 228   {
 229     if (servant != some_servant)
 230       throw new InternalError("Only one servant per delegate is supported.");
 231   }
 232 }