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/* * @(#)Stub.java 1.33 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ /* * Licensed Materials - Property of IBM * RMI-IIOP v1.0 * Copyright IBM Corp. 1998 1999 All Rights Reserved * * US Government Users Restricted Rights - Use, duplication or * disclosure restricted by GSA ADP Schedule Contract with IBM Corp. */ 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"; private static final String defaultStubImplName = "com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl"; static { Object stubDelegateInstance = (Object) createDelegateIfSpecified(StubClassKey, defaultStubImplName); 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 createDelegateIfSpecified(String classKey, String defaultClassName) { String className = (String) AccessController.doPrivileged(new GetPropertyAction(classKey)); if (className == null) { Properties props = getORBPropertiesFile(); if (props != null) { className = props.getProperty(classKey); } } if (className == null) { className = defaultClassName; } 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()); } }