Source for gnu.javax.rmi.CORBA.DelegateFactory

   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: }