001    /* ServantLocatorPOA.java --
002       Copyright (C) 2005, 2006 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.PortableServer;
040    
041    import gnu.CORBA.Poa.gnuServantObject;
042    
043    import org.omg.CORBA.NO_IMPLEMENT;
044    import org.omg.CORBA.ORB;
045    import org.omg.CORBA.SystemException;
046    import org.omg.CORBA.portable.InputStream;
047    import org.omg.CORBA.portable.InvokeHandler;
048    import org.omg.CORBA.portable.OutputStream;
049    import org.omg.CORBA.portable.ResponseHandler;
050    import org.omg.PortableServer.ServantLocatorPackage.CookieHolder;
051    
052    /**
053     * <p>The ServantLocator stub is an optional base for the
054     * servant locators. It cannot serve remote invocations, as
055     * methods in {@link ServantLocatorOperations} take POA as one of parameters.
056     * Both JDK 1.5 API and OMG specifies that POA is a local object that must not
057     * be transferred to the remote invocation target.
058     * </p><p>
059     * You do not need to derive your servant locator from this stub,
060     * it is enough to implement the {@link ServantLocator} interface.
061     * But you may choose to do this if you need its functional
062     * {@link org.omg.PortableServer.ServantActivatorPOA.delegator#_ids()} 
063     * method or want to keep default behaviour during pre- or post- invokcations.
064     * </p>
065     * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
066     */
067    public abstract class ServantLocatorPOA
068      extends Servant
069      implements ServantLocatorOperations, InvokeHandler
070    {
071      /**
072       * Used to access the outer class in the nested classes.
073       */
074      final ServantLocatorPOA THIS = this;
075    
076      /**
077       * Our implementation will not call this method. After setting your
078       * manager to POA, it will call incarnate and etherialize directly.
079       */
080      public OutputStream _invoke(String method, InputStream input,
081                                  ResponseHandler handler
082                                 )
083                           throws SystemException
084      {
085        throw new NO_IMPLEMENT();
086      }
087    
088      /**
089       * Returns an array of interfaces, supported by the servant locator.
090       */
091      public String[] _all_interfaces(POA poa, byte[] Object_Id)
092      {
093        return new _ServantLocatorStub()._ids();
094      }
095    
096      /**
097       * Return the complete instance of the servant activator, based on
098       * the current class (ServantActivatorPOA or derived).
099       */
100      public ServantLocator _this()
101      {
102        return new delegator(this);
103      }
104    
105      /**
106       * Return the complete instance of the servant activator, based on
107       * the current class (ServantActivatorPOA or derived).
108       */
109      public ServantLocator _this(ORB orb)
110      {
111        return new delegator(this);
112      }
113    
114      /**
115       * This class is used to support _this.
116       */
117      class delegator
118        extends gnuServantObject
119        implements ServantLocator
120      {
121        delegator(Servant s)
122        {
123          super(s, new byte[ 0 ], null, null);
124        }
125    
126        public Servant preinvoke(byte[] Object_Id, POA poa, String method,
127                                 CookieHolder cookie_holder
128                                )
129                          throws org.omg.PortableServer.ForwardRequest
130        {
131          return THIS.preinvoke(Object_Id, poa, method, cookie_holder);
132        }
133    
134        public void postinvoke(byte[] Object_Id, POA poa, String method,
135                               java.lang.Object cookie, Servant servant
136                              )
137        {
138          THIS.postinvoke(Object_Id, poa, method, cookie, servant);
139        }
140    
141        public String[] _ids()
142        {
143          return THIS._all_interfaces(null, null);
144        }
145      }
146    }