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The Util.java Java example source code
/*
* 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* Licensed Materials - Property of IBM
* RMI-IIOP v1.0
* Copyright IBM Corp. 1998 1999 All Rights Reserved
*
*/
package javax.rmi.CORBA;
import java.rmi.RemoteException;
import org.omg.CORBA.ORB;
import org.omg.CORBA.INITIALIZE;
import org.omg.CORBA.SystemException;
import org.omg.CORBA.Any;
import org.omg.CORBA.portable.InputStream;
import org.omg.CORBA.portable.OutputStream;
import org.omg.CORBA.portable.ObjectImpl;
import javax.rmi.CORBA.Tie;
import java.rmi.Remote;
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;
/**
* Provides utility methods that can be used by stubs and ties to
* perform common operations.
*/
public class Util {
// This can only be set at static initialization time (no sync necessary).
private static final javax.rmi.CORBA.UtilDelegate utilDelegate;
private static final String UtilClassKey = "javax.rmi.CORBA.UtilClass";
static {
utilDelegate = (javax.rmi.CORBA.UtilDelegate)createDelegate(UtilClassKey);
}
private Util(){}
/**
* Maps a SystemException to a RemoteException.
* @param ex the SystemException to map.
* @return the mapped exception.
*/
public static RemoteException mapSystemException(SystemException ex) {
if (utilDelegate != null) {
return utilDelegate.mapSystemException(ex);
}
return null;
}
/**
* Writes any java.lang.Object as a CORBA any.
* @param out the stream in which to write the any.
* @param obj the object to write as an any.
*/
public static void writeAny(OutputStream out, Object obj) {
if (utilDelegate != null) {
utilDelegate.writeAny(out, obj);
}
}
/**
* Reads a java.lang.Object as a CORBA any.
* @param in the stream from which to read the any.
* @return the object read from the stream.
*/
public static Object readAny(InputStream in) {
if (utilDelegate != null) {
return utilDelegate.readAny(in);
}
return null;
}
/**
* Writes a java.lang.Object as a CORBA Object. If <code>obj is
* an exported RMI-IIOP server object, the tie is found
* and wired to <code>obj, then written to
<code>out.write_Object(org.omg.CORBA.Object).
* If <code>obj is a CORBA Object, it is written to
* <code>out.write_Object(org.omg.CORBA.Object).
* @param out the stream in which to write the object.
* @param obj the object to write.
*/
public static void writeRemoteObject(OutputStream out,
java.lang.Object obj) {
if (utilDelegate != null) {
utilDelegate.writeRemoteObject(out, obj);
}
}
/**
* Writes a java.lang.Object as either a value or a CORBA Object.
* If <code>obj is a value object or a stub object, it is written to
* <code>out.write_abstract_interface(java.lang.Object). If obj
is
an exported
* RMI-IIOP server object, the tie is found and wired to <code>obj,
* then written to <code>out.write_abstract_interface(java.lang.Object).
* @param out the stream in which to write the object.
* @param obj the object to write.
*/
public static void writeAbstractObject(OutputStream out,
java.lang.Object obj) {
if (utilDelegate != null) {
utilDelegate.writeAbstractObject(out, obj);
}
}
/**
* Registers a target for a tie. Adds the tie to an internal table and calls
* {@link Tie#setTarget} on the tie object.
* @param tie the tie to register.
* @param target the target for the tie.
*/
public static void registerTarget(javax.rmi.CORBA.Tie tie,
java.rmi.Remote target) {
if (utilDelegate != null) {
utilDelegate.registerTarget(tie, target);
}
}
/**
* Removes the associated tie from an internal table and calls {@link
Tie#deactivate}
* to deactivate the object.
* @param target the object to unexport.
*/
public static void unexportObject(java.rmi.Remote target)
throws java.rmi.NoSuchObjectException
{
if (utilDelegate != null) {
utilDelegate.unexportObject(target);
}
}
/**
* Returns the tie (if any) for a given target object.
* @return the tie or null if no tie is registered for the given target.
*/
public static Tie getTie (Remote target) {
if (utilDelegate != null) {
return utilDelegate.getTie(target);
}
return null;
}
/**
* Returns a singleton instance of a class that implements the
* {@link ValueHandler} interface.
* @return a class which implements the ValueHandler interface.
*/
public static ValueHandler createValueHandler() {
if (utilDelegate != null) {
return utilDelegate.createValueHandler();
}
return null;
}
/**
* Returns the codebase, if any, for the given class.
* @param clz the class to get a codebase for.
* @return a space-separated list of URLs, or null.
*/
public static String getCodebase(java.lang.Class clz) {
if (utilDelegate != null) {
return utilDelegate.getCodebase(clz);
}
return null;
}
/**
* Returns a class instance for the specified class.
* <P>The spec for this method is the "Java to IDL language
* mapping", ptc/00-01-06.
* <P>In Java SE Platform, this method works as follows:
* <UL>Find the first non-null ClassLoader on the
* call stack and attempt to load the class using this
* <tt>ClassLoader.
* <LI>If the first step fails, and if remoteCodebase
* is non-null and
* <tt>useCodebaseOnly is false, then call
* <tt>java.rmi.server.RMIClassLoader.loadClass(remoteCodebase, className).
* <LI>If remoteCodebase is null or useCodebaseOnly
* is true, then call <tt>java.rmi.server.RMIClassLoader.loadClass(className).
* <LI>If a class was not successfully loaded by step 1, 2, or 3,
* and <tt>loader is non-null, then call loader.loadClass(className).
* <LI>If a class was successfully loaded by step 1, 2, 3, or 4, then
* return the loaded class, else throw <tt>ClassNotFoundException.
* @param className the name of the class.
* @param remoteCodebase a space-separated list of URLs at which
* the class might be found. May be null.
* @param loader a <tt>ClassLoader that may be used to
* load the class if all other methods fail.
* @return the <code>Class object representing the loaded class.
* @exception ClassNotFoundException if class cannot be loaded.
*/
public static Class loadClass(String className,
String remoteCodebase,
ClassLoader loader)
throws ClassNotFoundException {
if (utilDelegate != null) {
return utilDelegate.loadClass(className,remoteCodebase,loader);
}
return null ;
}
/**
* The <tt>isLocal method has the same semantics as the
* <tt>ObjectImpl._is_local
* method, except that it can throw a <tt>RemoteException.
*
* The <tt>_is_local() method is provided so that stubs may determine if a
* particular object is implemented by a local servant and hence local
* invocation APIs may be used.
*
* @param stub the stub to test.
*
* @return The <tt>_is_local() method returns true if
* the servant incarnating the object is located in the same process as
* the stub and they both share the same ORB instance. The <tt>_is_local()
* method returns false otherwise. The default behavior of <tt>_is_local() is
* to return false.
*
* @throws RemoteException The Java to IDL specification does not
* specify the conditions that cause a <tt>RemoteException to be thrown.
*/
public static boolean isLocal(Stub stub) throws RemoteException {
if (utilDelegate != null) {
return utilDelegate.isLocal(stub);
}
return false;
}
/**
* Wraps an exception thrown by an implementation
* method. It returns the corresponding client-side exception.
* @param orig the exception to wrap.
* @return the wrapped exception.
*/
public static RemoteException wrapException(Throwable orig) {
if (utilDelegate != null) {
return utilDelegate.wrapException(orig);
}
return null;
}
/**
* Copies or connects an array of objects. Used by local stubs
* to copy any number of actual parameters, preserving sharing
* across parameters as necessary to support RMI semantics.
* @param obj the objects to copy or connect.
* @param orb the ORB.
* @return the copied or connected objects.
* @exception RemoteException if any object could not be copied or connected.
*/
public static Object[] copyObjects (Object[] obj, ORB orb)
throws RemoteException {
if (utilDelegate != null) {
return utilDelegate.copyObjects(obj, orb);
}
return null;
}
/**
* Copies or connects an object. Used by local stubs to copy
* an actual parameter, result object, or exception.
* @param obj the object to copy.
* @param orb the ORB.
* @return the copy or connected object.
* @exception RemoteException if the object could not be copied or connected.
*/
public static Object copyObject (Object obj, ORB orb)
throws RemoteException {
if (utilDelegate != null) {
return utilDelegate.copyObject(obj, orb);
}
return null;
}
// 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 Stub.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.Util();
}
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());
}
}
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