libjava/java/rmi/server/RemoteObject.java

   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 As a special exception, if you link this library with other files to
  22 produce an executable, this library does not by itself cause the
  23 resulting executable to be covered by the GNU General Public License.
  24 This exception does not however invalidate any other reasons why the
  25 executable file might be covered by the GNU General Public License.
  26  */
  27
  28 package java.rmi.server;
  29
  30 import java.io.Serializable;
  31 import java.rmi.Remote;
  32 import java.rmi.NoSuchObjectException;
  33 import java.rmi.UnmarshalException;
  34 import java.rmi.server.RemoteRef;
  35 import java.io.ObjectInputStream;
  36 import java.io.ObjectOutputStream;
  37 import java.io.IOException;
  38 import java.lang.ClassNotFoundException;
  39 import java.lang.InstantiationException;
  40 import java.lang.IllegalAccessException;
  41
  42 public abstract class RemoteObject
  43         implements Remote, Serializable {
  44
  45 public static final long serialVersionUID = -3215090123894869218l;
  46
  47 protected transient RemoteRef ref;
  48
  49 protected RemoteObject() {
  50         this(null);
  51 }
  52
  53 protected RemoteObject(RemoteRef newref) {
  54         ref = newref;
  55 }
  56
  57 public RemoteRef getRef() {
  58         return (ref);
  59 }
  60
  61 public static Remote toStub(Remote obj) throws NoSuchObjectException {
  62         throw new Error("Not implemented");
  63 }
  64
  65 public int hashCode() {
  66         if (ref == null) {
  67                 return (0);
  68         }
  69         else {
  70                 return (ref.hashCode());
  71         }
  72 }
  73
  74 public boolean equals(Object obj) {
  75         // We only compare references.
  76         return (this == obj);
  77 }
  78
  79 public String toString() {
  80         return (ref.toString());
  81 }
  82
  83 private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
  84         String cname = in.readUTF();
  85         if (!cname.equals("")) {
  86                 cname = RemoteRef.packagePrefix + '.' + cname;
  87                 try {
  88                         Class cls = Class.forName(cname);
  89                         ref = (RemoteRef)cls.newInstance();
  90                 }
  91                 catch (InstantiationException e1) {
  92                         throw new UnmarshalException("failed to create ref");
  93                 }
  94                 catch (IllegalAccessException e2) {
  95                         throw new UnmarshalException("failed to create ref");
  96                 }
  97                 ref.readExternal(in);
  98         }
  99         else {
 100                 ref = (RemoteRef)in.readObject();
 101         }
 102 }
 103
 104 private void writeObject(ObjectOutputStream out) throws IOException, ClassNotFoundException {
 105         if (ref == null) {
 106                 throw new UnmarshalException("no ref to serialize");
 107         }
 108         String cname = ref.getRefClass(out);
 109         if (cname != null && cname.length() > 0) {
 110                 out.writeUTF(cname);
 111                 ref.writeExternal(out);
 112         }
 113         else {
 114                 out.writeUTF("");
 115                 out.writeObject(ref);
 116         }
 117 }
 118
 119 }