1 /* RemoteObject.java --
2 Copyright (c) 1996, 1997, 1998, 1999, 2004 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
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)
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.
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., 59 Temple Place, Suite 330, Boston, MA
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
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. */
38 package java.rmi.server;
40 import java.io.IOException;
41 import java.io.ObjectInputStream;
42 import java.io.ObjectOutputStream;
43 import java.io.Serializable;
44 import java.rmi.NoSuchObjectException;
45 import java.rmi.Remote;
46 import java.rmi.UnmarshalException;
47 import java.util.WeakHashMap;
49 public abstract class RemoteObject
50 implements Remote, Serializable {
52 private static final long serialVersionUID = -3215090123894869218l;
54 protected transient RemoteRef ref;
56 private static final WeakHashMap stubs = new WeakHashMap();
58 protected RemoteObject() {
62 protected RemoteObject(RemoteRef newref) {
66 public RemoteRef getRef() {
70 synchronized static void addStub(Remote obj, Remote stub)
75 synchronized static void deleteStub(Remote obj)
80 public static Remote toStub(Remote obj) throws NoSuchObjectException
82 Remote stub = (Remote)stubs.get(obj);
85 throw new NoSuchObjectException(obj.getClass().getName());
90 public int hashCode() {
95 return (ref.hashCode());
99 public boolean equals(Object obj) {
100 // We only compare references.
101 return (this == obj);
104 public String toString()
107 return getClass ().toString ();
108 return (ref.toString ());
111 private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
113 String cname = in.readUTF();
114 if (!cname.equals(""))
116 if (cname.equals ("UnicastRef2"))
118 // hack for interoperating with JDK
119 cname = "UnicastRef";
120 in.read (); //some unknown UnicastRef2 field
123 cname = RemoteRef.packagePrefix + '.' + cname;
126 Class cls = Class.forName(cname);
127 ref = (RemoteRef)cls.newInstance();
129 catch (InstantiationException e1)
131 throw new UnmarshalException("failed to create ref", e1);
133 catch (IllegalAccessException e2)
135 throw new UnmarshalException("failed to create ref", e2);
137 ref.readExternal(in);
141 ref = (RemoteRef)in.readObject();
145 private void writeObject(ObjectOutputStream out) throws IOException, ClassNotFoundException {
147 throw new UnmarshalException("no ref to serialize");
149 String cname = ref.getRefClass(out);
150 if (cname != null && cname.length() > 0) {
152 ref.writeExternal(out);
156 out.writeObject(ref);