old-autovect-branch/libjava/classpath/gnu/javax/rmi/CORBA/DelegateFactory.java

   1 /* DelegateFactory.java --
   2    Copyright (C) 2002, 2004, 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.javax.rmi.CORBA;
  40
  41 import gnu.CORBA.ObjectCreator;
  42
  43
  44 /**
  45  * This class produces delegates, using the system properties. If not
  46  * corresponding property is specified, returns default implementations.
  47  *
  48  * @author Wu Gansha (gansha.wu@intel.com)
  49  * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
  50  */
  51 public class DelegateFactory
  52 {
  53   /**
  54    * The name to get a stub delegate.
  55    */
  56   public static final String STUB = "Stub";
  57
  58   /**
  59    * The name to get the util delegate.
  60    */
  61   public static final String UTIL = "Util";
  62
  63   /**
  64    * The name to get the ValueHandler delegate.
  65    */
  66   public static final String VALUEHANDLER = "ValueHandler";
  67
  68   /**
  69    * The name to get the PortableRemoteObject delegate.
  70    */
  71   public static final String PORTABLE_REMOTE_OBJECT = "PortableRemoteObject";
  72
  73   /**
  74    * Get an instance of the given delegate. As in all cases the singleton
  75    * instance is used, the caching here would be redundant.
  76    *
  77    * @param type a delegate type.
  78    *
  79    * @return the associated delegate.
  80    *
  81    * @throws InternalError if the delegate class, indicated in the system
  82    * properties, cannot be instantiated.
  83    */
  84   public static Object getInstance(String type)
  85     throws InternalError
  86   {
  87     String propertyName = "javax.rmi.CORBA." + type + "Class";
  88     String dcname = System.getProperty(propertyName);
  89     if (dcname == null)
  90       {
  91         // // No javax.rmi.CORBA.XXXClass property sepcified.
  92         dcname = "gnu.javax.rmi.CORBA." + type + "DelegateImpl";
  93       }
  94     try
  95       {
  96         Class dclass = ObjectCreator.forName(dcname);
  97         return dclass.newInstance();
  98       }
  99     catch (Exception e)
 100       {
 101         InternalError ierr = new InternalError("Exception when trying to get "
 102           + type + "delegate instance:" + dcname);
 103         ierr.initCause(e);
 104         throw ierr;
 105       }
 106   }
 107 }