/**
* <code>writeObject</code> for custom serialization.
*
* <p>This method writes this object's serialized form for this class as follows:
*
* <p>The <code>writeObject</code> method is invoked on <code>out</code> passing this object's
* unique identifier (a {@link java.rmi.server.UID UID} instance) as the argument.
*
* <p>Next, the {@link java.rmi.server.RemoteRef#getRefClass(java.io.ObjectOutput) getRefClass}
* method is invoked on the activator's <code>RemoteRef</code> instance to obtain its external ref
* type name. Next, the <code>writeUTF</code> method is invoked on <code>out</code> with the value
* returned by <code>getRefClass</code>, and then the <code>writeExternal</code> method is invoked
* on the <code>RemoteRef</code> instance passing <code>out</code> as the argument.
*
* @serialData The serialized data for this class comprises a <code>java.rmi.server.UID</code>
* (written with <code>ObjectOutput.writeObject</code>) followed by the external ref type name
* of the activator's <code>RemoteRef</code> instance (a string written with <code>
* ObjectOutput.writeUTF</code>), followed by the external form of the <code>RemoteRef</code>
* instance as written by its <code>writeExternal</code> method.
* <p>The external ref type name of the <code>RemoteRef</Code> instance is determined using
* the definitions of external ref type names specified in the {@link
* java.rmi.server.RemoteObject RemoteObject} <code>writeObject</code> method
* <b>serialData</b> specification. Similarly, the data written by the <code>writeExternal
* </code> method and read by the <code>readExternal</code> method of <code>RemoteRef</code>
* implementation classes corresponding to each of the defined external ref type names is
* specified in the {@link java.rmi.server.RemoteObject RemoteObject} <code>writeObject</code>
* method <b>serialData</b> specification.
*/
private void writeObject(ObjectOutputStream out) throws IOException, ClassNotFoundException {
out.writeObject(uid);
RemoteRef ref;
if (activator instanceof RemoteObject) {
ref = ((RemoteObject) activator).getRef();
} else if (Proxy.isProxyClass(activator.getClass())) {
InvocationHandler handler = Proxy.getInvocationHandler(activator);
if (!(handler instanceof RemoteObjectInvocationHandler)) {
throw new InvalidObjectException("unexpected invocation handler");
}
ref = ((RemoteObjectInvocationHandler) handler).getRef();
} else {
throw new InvalidObjectException("unexpected activator type");
}
out.writeUTF(ref.getRefClass(out));
ref.writeExternal(out);
}
