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From-SVN: r104578
2005-09-23 19:36:46 +00:00
parent acff2da93c
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+/* ServantLocatorPOA.java --
+   Copyright (C) 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
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+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
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package org.omg.PortableServer;
+
+import gnu.CORBA.Poa.gnuServantObject;
+
+import org.omg.CORBA.NO_IMPLEMENT;
+import org.omg.CORBA.ORB;
+import org.omg.CORBA.SystemException;
+import org.omg.CORBA.portable.InputStream;
+import org.omg.CORBA.portable.InvokeHandler;
+import org.omg.CORBA.portable.OutputStream;
+import org.omg.CORBA.portable.ResponseHandler;
+import org.omg.PortableServer.ServantLocatorPackage.CookieHolder;
+
+/**
+ * <p>The ServantLocator stub is an optional base for the
+ * servant locators. It cannot serve remote invocations, as
+ * methods in {@link ServantLocatorOperations} take POA as one of parameters.
+ * Both JDK 1.5 API and OMG specifies that POA is a local object that must not
+ * be transferred to the remote invocation target.
+ * </p><p>
+ * You do not need to derive your servant locator from this stub,
+ * it is enough to implement the {@link ServantLocator} interface.
+ * But you may choose to do this if you need its functional
+ * {@link #_ids()} method or want to keep default behavior during per-
+ * or post- invokcations.
+ * </p>
+ * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
+ */
+public class ServantLocatorPOA
+  extends Servant
+  implements ServantLocatorOperations, InvokeHandler
+{
+  /**
+   * Used to access the outer class in the nested classes.
+   */
+  final ServantLocatorPOA THIS = this;
+
+  /**
+   * It is your responsibility to take the preinvoke actions, if any,
+   * and also supply an appropriate servant for the current invocation.
+   *
+   * The default method instructs POA that the servant cannot be
+   * provided by locator. The OBJ_ADAPTER exception will be
+   * thrown by POA, unless it uses the available default servant for all
+   * invocations.
+   *
+   * @specnote in GNU Classpath, returning null means that the
+   * locator does not supply the servant.
+   *
+   * @see ServantLocatorOperations#preinvoke
+   */
+  public Servant preinvoke(byte[] Object_Id, POA poa, String method,
+                           CookieHolder cookie_holder
+                          )
+                    throws org.omg.PortableServer.ForwardRequest
+  {
+    return null;
+  }
+
+  /**
+   * It is your responsibility to take the postinvoke actions, if any,
+   * by overriding this method. The default method does nothing.
+   *
+   * @see ServantLocatorOperations#postinvoke
+   */
+  public void postinvoke(byte[] Object_Id, POA poa, String method,
+                         java.lang.Object cookie, Servant servant
+                        )
+  {
+  }
+
+  /**
+   * Our implementation will not call this method. After setting your
+   * manager to POA, it will call incarnate and etherialize directly.
+   */
+  public OutputStream _invoke(String method, InputStream input,
+                              ResponseHandler handler
+                             )
+                       throws SystemException
+  {
+    throw new NO_IMPLEMENT();
+  }
+
+  /**
+   * Returns an array of interfaces, supported by the servant locator.
+   */
+  public String[] _all_interfaces(POA poa, byte[] Object_Id)
+  {
+    return new _ServantLocatorStub()._ids();
+  }
+
+  /**
+   * Return the complete instance of the servant activator, based on
+   * the current class (ServantActivatorPOA or derived).
+   */
+  public ServantLocator _this()
+  {
+    return new delegator(this);
+  }
+
+  /**
+   * Return the complete instance of the servant activator, based on
+   * the current class (ServantActivatorPOA or derived).
+   */
+  public ServantLocator _this(ORB orb)
+  {
+    return new delegator(this);
+  }
+
+  /**
+   * This class is used to support _this.
+   */
+  class delegator
+    extends gnuServantObject
+    implements ServantLocator
+  {
+    delegator(Servant s)
+    {
+      super(s, new byte[ 0 ], null, null);
+    }
+
+    public Servant preinvoke(byte[] Object_Id, POA poa, String method,
+                             CookieHolder cookie_holder
+                            )
+                      throws org.omg.PortableServer.ForwardRequest
+    {
+      return THIS.preinvoke(Object_Id, poa, method, cookie_holder);
+    }
+
+    public void postinvoke(byte[] Object_Id, POA poa, String method,
+                           java.lang.Object cookie, Servant servant
+                          )
+    {
+      THIS.postinvoke(Object_Id, poa, method, cookie, servant);
+    }
+
+    public String[] _ids()
+    {
+      return THIS._all_interfaces(null, null);
+    }
+  }
+}