llvm-gcc-4.2/libjava/classpath/gnu/javax/rmi/CORBA/DelegateFactory.java

/* DelegateFactory.java -- 
   Copyright (C) 2002, 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
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package gnu.javax.rmi.CORBA;

import gnu.CORBA.ObjectCreator;


/**
 * This class produces delegates, using the system properties. If not
 * corresponding property is specified, returns default implementations.
 * 
 * @author Wu Gansha (gansha.wu@intel.com)
 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
 */
public class DelegateFactory
{
  /**
   * The name to get a stub delegate.
   */
  public static final String STUB = "Stub";

  /**
   * The name to get the util delegate.
   */
  public static final String UTIL = "Util";

  /**
   * The name to get the ValueHandler delegate.
   */
  public static final String VALUEHANDLER = "ValueHandler";

  /**
   * The name to get the PortableRemoteObject delegate.
   */
  public static final String PORTABLE_REMOTE_OBJECT = "PortableRemoteObject";

  /**
   * Get an instance of the given delegate. As in all cases the singleton
   * instance is used, the caching here would be redundant.
   * 
   * @param type a delegate type.
   * 
   * @return the associated delegate.
   * 
   * @throws InternalError if the delegate class, indicated in the system
   * properties, cannot be instantiated.
   */
  public static Object getInstance(String type)
    throws InternalError
  {
    String propertyName = "javax.rmi.CORBA." + type + "Class";
    String dcname = System.getProperty(propertyName);
    if (dcname == null)
      {
        // // No javax.rmi.CORBA.XXXClass property sepcified.
        dcname = "gnu.javax.rmi.CORBA." + type + "DelegateImpl";
      }
    try
      {
        Class dclass = ObjectCreator.forName(dcname);
        return dclass.newInstance();
      }
    catch (Exception e)
      {
        InternalError ierr = new InternalError("Exception when trying to get "
          + type + "delegate instance:" + dcname);
        ierr.initCause(e);
        throw ierr;
      }
  }
}