1 /*
2 Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
3
4 This file is part of GNU Classpath.
5
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)
9 any later version.
10
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.
15
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
19 02111-1307 USA.
20
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
24 combination.
25
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. */
37
38 package java.rmi.server;
39
40 import java.io.Serializable;
41 import java.rmi.Remote;
42 import java.rmi.NoSuchObjectException;
43 import java.rmi.UnmarshalException;
44 import java.rmi.server.RemoteRef;
45 import java.io.ObjectInputStream;
46 import java.io.ObjectOutputStream;
47 import java.io.IOException;
48 import java.lang.ClassNotFoundException;
49 import java.lang.InstantiationException;
50 import java.lang.IllegalAccessException;
51 import java.lang.reflect.Constructor;
52
53 public abstract class RemoteObject
54 implements Remote, Serializable {
55
56 public static final long serialVersionUID = -3215090123894869218l;
57
58 protected transient RemoteRef ref;
59
RemoteObject()60 protected RemoteObject() {
61 this(null);
62 }
63
RemoteObject(RemoteRef newref)64 protected RemoteObject(RemoteRef newref) {
65 ref = newref;
66 }
67
getRef()68 public RemoteRef getRef() {
69 return (ref);
70 }
71
toStub(Remote obj)72 public static Remote toStub(Remote obj) throws NoSuchObjectException
73 {
74 Class cls = obj.getClass();
75 String classname = cls.getName();
76 ClassLoader cl = cls.getClassLoader();
77 try
78 {
79 Class scls = cl.loadClass(classname + "_Stub");
80 // JDK 1.2 stubs
81 Class[] stubprototype = new Class[] { RemoteRef.class };
82 Constructor con = scls.getConstructor(stubprototype);
83 return (Remote)(con.newInstance(new Object[]{obj}));
84 }
85 catch (Exception e) {}
86 throw new NoSuchObjectException(obj.getClass().getName());
87 }
88
hashCode()89 public int hashCode() {
90 if (ref == null) {
91 return (0);
92 }
93 else {
94 return (ref.hashCode());
95 }
96 }
97
equals(Object obj)98 public boolean equals(Object obj) {
99 // We only compare references.
100 return (this == obj);
101 }
102
toString()103 public String toString()
104 {
105 if (ref == null)
106 return getClass ().toString ();
107 return (ref.toString ());
108 }
109
readObject(ObjectInputStream in)110 private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
111 {
112 String cname = in.readUTF();
113 if (!cname.equals(""))
114 {
115 if (cname.equals ("UnicastRef2"))
116 {
117 // hack for interoperating with JDK
118 cname = "UnicastRef";
119 in.read (); //some unknown UnicastRef2 field
120 }
121
122 cname = RemoteRef.packagePrefix + '.' + cname;
123 try
124 {
125 Class cls = Class.forName(cname);
126 ref = (RemoteRef)cls.newInstance();
127 }
128 catch (InstantiationException e1)
129 {
130 throw new UnmarshalException("failed to create ref", e1);
131 }
132 catch (IllegalAccessException e2)
133 {
134 throw new UnmarshalException("failed to create ref", e2);
135 }
136 ref.readExternal(in);
137 }
138 else
139 {
140 ref = (RemoteRef)in.readObject();
141 }
142 }
143
writeObject(ObjectOutputStream out)144 private void writeObject(ObjectOutputStream out) throws IOException, ClassNotFoundException {
145 if (ref == null) {
146 throw new UnmarshalException("no ref to serialize");
147 }
148 String cname = ref.getRefClass(out);
149 if (cname != null && cname.length() > 0) {
150 out.writeUTF(cname);
151 ref.writeExternal(out);
152 }
153 else {
154 out.writeUTF("");
155 out.writeObject(ref);
156 }
157 }
158
159 }
160