Initial revision

From-SVN: r102074

libjava/classpath/java/rmi/server/RemoteObject.java

@@ -0,0 +1,160 @@
+/* RemoteObject.java --
+   Copyright (c) 1996, 1997, 1998, 1999, 2004  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 java.rmi.server;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.rmi.NoSuchObjectException;
+import java.rmi.Remote;
+import java.rmi.UnmarshalException;
+import java.util.WeakHashMap;
+
+public abstract class RemoteObject
+	implements Remote, Serializable {
+
+private static final long serialVersionUID = -3215090123894869218l;
+
+protected transient RemoteRef ref;
+
+private static final WeakHashMap stubs = new WeakHashMap();
+
+protected RemoteObject() {
+	this(null);
+}
+
+protected RemoteObject(RemoteRef newref) {
+	ref = newref;
+}
+
+public RemoteRef getRef() {
+	return (ref);
+}
+
+synchronized static void addStub(Remote obj, Remote stub)
+{
+  stubs.put(obj, stub);
+}
+
+synchronized static void deleteStub(Remote obj)
+{
+  stubs.remove(obj);
+}
+
+  public static Remote toStub(Remote obj) throws NoSuchObjectException 
+  {
+    Remote stub = (Remote)stubs.get(obj);
+
+    if (stub == null)
+      throw new NoSuchObjectException(obj.getClass().getName());
+
+    return stub;
+  }
+
+public int hashCode() {
+	if (ref == null) {
+		return (0);
+	}
+	else {
+		return (ref.hashCode());
+	}
+}
+
+public boolean equals(Object obj) {
+	// We only compare references.
+	return (this == obj);
+}
+
+  public String toString() 
+  {
+    if (ref == null)
+      return getClass ().toString ();
+    return (ref.toString ());
+  }
+  
+  private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException 
+  {
+    String cname = in.readUTF();
+    if (!cname.equals("")) 
+      {
+	if (cname.equals ("UnicastRef2"))
+	  { 
+	    // hack for interoperating with JDK
+	    cname = "UnicastRef";
+	    in.read (); //some unknown UnicastRef2 field
+	  }
+
+	cname = RemoteRef.packagePrefix + '.' + cname;
+	try 
+	  {
+	    Class cls = Class.forName(cname);
+	    ref = (RemoteRef)cls.newInstance();
+	  }
+	catch (InstantiationException e1) 
+	  {
+	    throw new UnmarshalException("failed to create ref", e1);
+	  }
+	catch (IllegalAccessException e2) 
+	  {
+	    throw new UnmarshalException("failed to create ref", e2);
+	  }
+	ref.readExternal(in);
+      }
+    else 
+      {
+	ref = (RemoteRef)in.readObject();
+      }
+  }
+
+private void writeObject(ObjectOutputStream out) throws IOException, ClassNotFoundException {
+	if (ref == null) {
+		throw new UnmarshalException("no ref to serialize");
+	}
+	String cname = ref.getRefClass(out);
+	if (cname != null && cname.length() > 0) {
+		out.writeUTF(cname);
+		ref.writeExternal(out);
+	}
+	else {
+		out.writeUTF("");
+		out.writeObject(ref);
+	}
+}
+
+}