gcc/libjava/java/rmi/server/RemoteObject.java

/*
  Copyright (c) 1996, 1997, 1998, 1999 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
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any later version.
 
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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.

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permission to link this library with independent modules to produce an
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exception statement from your version. */

package java.rmi.server;

import java.io.Serializable;
import java.rmi.Remote;
import java.rmi.NoSuchObjectException;
import java.rmi.UnmarshalException;
import java.rmi.server.RemoteRef;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.lang.ClassNotFoundException;
import java.lang.InstantiationException;
import java.lang.IllegalAccessException;
import java.lang.reflect.Constructor;

public abstract class RemoteObject
	implements Remote, Serializable {

public static final long serialVersionUID = -3215090123894869218l;

protected transient RemoteRef ref;

protected RemoteObject() {
	this(null);
}

protected RemoteObject(RemoteRef newref) {
	ref = newref;
}

public RemoteRef getRef() {
	return (ref);
}

  public static Remote toStub(Remote obj) throws NoSuchObjectException 
  {
    Class cls = obj.getClass();
    String classname = cls.getName();
    ClassLoader cl = cls.getClassLoader();
    try 
      {
	Class scls = cl.loadClass(classname + "_Stub");
	// JDK 1.2 stubs
	Class[] stubprototype = new Class[] { RemoteRef.class };
	Constructor con = scls.getConstructor(stubprototype);
	return (Remote)(con.newInstance(new Object[]{obj}));
      }
    catch (Exception e) {}
    throw new NoSuchObjectException(obj.getClass().getName());
  }

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);
	}
}

}