/*
* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
/*
* Licensed Materials - Property of IBM
* RMI-IIOP v1.0
* Copyright IBM Corp. 1998 1999 All Rights Reserved
*
*/
package javax.rmi.CORBA;
import org.omg.CORBA.ORB;
import org.omg.CORBA.INITIALIZE;
import org.omg.CORBA_2_3.portable.ObjectImpl;
import java.io.IOException;
import java.rmi.RemoteException;
import java.io.File;
import java.io.FileInputStream;
import java.net.MalformedURLException ;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Properties;
import java.rmi.server.RMIClassLoader;
import com.sun.corba.se.impl.orbutil.GetPropertyAction;
/**
* Base class from which all RMI-IIOP stubs must inherit.
*/
public abstract class Stub extends ObjectImpl
implements java.io.Serializable {
private static final long serialVersionUID = 1087775603798577179L;
// This can only be set at object construction time (no sync necessary).
private transient StubDelegate stubDelegate = null;
private static Class stubDelegateClass = null;
private static final String StubClassKey = "javax.rmi.CORBA.StubClass";
static {
Object stubDelegateInstance = createDelegate(StubClassKey);
if (stubDelegateInstance != null)
stubDelegateClass = stubDelegateInstance.getClass();
}
/**
* Returns a hash code value for the object which is the same for all stubs
* that represent the same remote object.
* @return the hash code value.
*/
public int hashCode() {
if (stubDelegate == null) {
setDefaultDelegate();
}
if (stubDelegate != null) {
return stubDelegate.hashCode(this);
}
return 0;
}
/**
* Compares two stubs for equality. Returns <code>true</code> when used to compare stubs
* that represent the same remote object, and <code>false</code> otherwise.
* @param obj the reference object with which to compare.
* @return <code>true</code> if this object is the same as the <code>obj</code>
* argument; <code>false</code> otherwise.
*/
public boolean equals(java.lang.Object obj) {
if (stubDelegate == null) {
setDefaultDelegate();
}
if (stubDelegate != null) {
return stubDelegate.equals(this, obj);
}
return false;
}
/**
* Returns a string representation of this stub. Returns the same string
* for all stubs that represent the same remote object.
* @return a string representation of this stub.
*/
public String toString() {
if (stubDelegate == null) {
setDefaultDelegate();
}
String ior;
if (stubDelegate != null) {
ior = stubDelegate.toString(this);
if (ior == null) {
return super.toString();
} else {
return ior;
}
}
return super.toString();
}
/**
* Connects this stub to an ORB. Required after the stub is deserialized
* but not after it is demarshalled by an ORB stream. If an unconnected
* stub is passed to an ORB stream for marshalling, it is implicitly
* connected to that ORB. Application code should not call this method
* directly, but should call the portable wrapper method
* {@link javax.rmi.PortableRemoteObject#connect}.
* @param orb the ORB to connect to.
* @exception RemoteException if the stub is already connected to a different
* ORB, or if the stub does not represent an exported remote or local object.
*/
public void connect(ORB orb) throws RemoteException {
if (stubDelegate == null) {
setDefaultDelegate();
}
if (stubDelegate != null) {
stubDelegate.connect(this, orb);
}
}
/**
* Serialization method to restore the IOR state.
*/
private void readObject(java.io.ObjectInputStream stream)
throws IOException, ClassNotFoundException {
if (stubDelegate == null) {
setDefaultDelegate();
}
if (stubDelegate != null) {
stubDelegate.readObject(this, stream);
}
}
/**
* Serialization method to save the IOR state.
* @serialData The length of the IOR type ID (int), followed by the IOR type ID
* (byte array encoded using ISO8859-1), followed by the number of IOR profiles
* (int), followed by the IOR profiles. Each IOR profile is written as a
* profile tag (int), followed by the length of the profile data (int), followed
* by the profile data (byte array).
*/
private void writeObject(java.io.ObjectOutputStream stream) throws IOException {
if (stubDelegate == null) {
setDefaultDelegate();
}
if (stubDelegate != null) {
stubDelegate.writeObject(this, stream);
}
}
private void setDefaultDelegate() {
if (stubDelegateClass != null) {
try {
stubDelegate = (javax.rmi.CORBA.StubDelegate) stubDelegateClass.newInstance();
} catch (Exception ex) {
// what kind of exception to throw
// delegate not set therefore it is null and will return default
// values
}
}
}
// Same code as in PortableRemoteObject. Can not be shared because they
// are in different packages and the visibility needs to be package for
// security reasons. If you know a better solution how to share this code
// then remove it from PortableRemoteObject. Also in Util.java
private static Object createDelegate(String classKey) {
String className = (String)
AccessController.doPrivileged(new GetPropertyAction(classKey));
if (className == null) {
Properties props = getORBPropertiesFile();
if (props != null) {
className = props.getProperty(classKey);
}
}
if (className == null) {
return new com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl();
}
try {
return loadDelegateClass(className).newInstance();
} catch (ClassNotFoundException ex) {
INITIALIZE exc = new INITIALIZE( "Cannot instantiate " + className);
exc.initCause( ex ) ;
throw exc ;
} catch (Exception ex) {
INITIALIZE exc = new INITIALIZE( "Error while instantiating" + className);
exc.initCause( ex ) ;
throw exc ;
}
}
private static Class loadDelegateClass( String className ) throws ClassNotFoundException
{
try {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
return Class.forName(className, false, loader);
} catch (ClassNotFoundException e) {
// ignore, then try RMIClassLoader
}
try {
return RMIClassLoader.loadClass(className);
} catch (MalformedURLException e) {
String msg = "Could not load " + className + ": " + e.toString();
ClassNotFoundException exc = new ClassNotFoundException( msg ) ;
throw exc ;
}
}
/**
* Load the orb.properties file.
*/
private static Properties getORBPropertiesFile () {
return (Properties) AccessController.doPrivileged(new GetORBPropertiesFileAction());
}
}