Module java.corba

Package javax.rmi.CORBA

Class Util

java.lang.Object

javax.rmi.CORBA.Util

public class Util
extends Object

Provides utility methods that can be used by stubs and ties to perform common operations.

Method Summary

Modifier and Type	Method	Description
static Object	copyObject(Object obj, ORB orb)	Copies or connects an object.
static Object[]	copyObjects(Object[] obj, ORB orb)	Copies or connects an array of objects.
static ValueHandler	createValueHandler()	Returns a singleton instance of a class that implements the ValueHandler interface.
static String	getCodebase(Class clz)	Returns the codebase, if any, for the given class.
static Tie	getTie(Remote target)	Returns the tie (if any) for a given target object.
static boolean	isLocal(Stub stub)	The isLocal method has the same semantics as the ObjectImpl._is_local method, except that it can throw a RemoteException.
static Class	loadClass(String className, String remoteCodebase, ClassLoader loader)	Returns a class instance for the specified class.
static RemoteException	mapSystemException(SystemException ex)	Maps a SystemException to a RemoteException.
static Object	readAny(InputStream in)	Reads a java.lang.Object as a CORBA any.
static void	registerTarget(Tie tie, Remote target)	Registers a target for a tie.
static void	unexportObject(Remote target)	Removes the associated tie from an internal table and calls Tie.deactivate() to deactivate the object.
static RemoteException	wrapException(Throwable orig)	Wraps an exception thrown by an implementation method.
static void	writeAbstractObject(OutputStream out, Object obj)	Writes a java.lang.Object as either a value or a CORBA Object.
static void	writeAny(OutputStream out, Object obj)	Writes any java.lang.Object as a CORBA any.
static void	writeRemoteObject(OutputStream out, Object obj)	Writes a java.lang.Object as a CORBA Object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

mapSystemException

public static RemoteException mapSystemException(SystemException ex)

Maps a SystemException to a RemoteException.

Parameters:

ex - the SystemException to map.

Returns:

the mapped exception.

writeAny

public static void writeAny(OutputStream out,
                            Object obj)

Writes any java.lang.Object as a CORBA any.

Parameters:

out - the stream in which to write the any.

obj - the object to write as an any.

readAny

public static Object readAny(InputStream in)

Reads a java.lang.Object as a CORBA any.

Parameters:

in - the stream from which to read the any.

Returns:

the object read from the stream.

writeRemoteObject

public static void writeRemoteObject(OutputStream out,
                                     Object obj)

Writes a java.lang.Object as a CORBA Object. If obj is an exported RMI-IIOP server object, the tie is found and wired to obj, then written to out.write_Object(org.omg.CORBA.Object). If obj is a CORBA Object, it is written to out.write_Object(org.omg.CORBA.Object).

Parameters:

out - the stream in which to write the object.

obj - the object to write.

writeAbstractObject

public static void writeAbstractObject(OutputStream out,
                                       Object obj)

Writes a java.lang.Object as either a value or a CORBA Object. If obj is a value object or a stub object, it is written to out.write_abstract_interface(java.lang.Object). If obj is an exported RMI-IIOP server object, the tie is found and wired to obj, then written to out.write_abstract_interface(java.lang.Object).

Parameters:

out - the stream in which to write the object.

obj - the object to write.

registerTarget

public static void registerTarget(Tie tie,
                                  Remote target)

Registers a target for a tie. Adds the tie to an internal table and calls Tie.setTarget(java.rmi.Remote) on the tie object.

Parameters:

tie - the tie to register.

target - the target for the tie.

unexportObject

public static void unexportObject(Remote target)
                           throws NoSuchObjectException

Removes the associated tie from an internal table and calls Tie.deactivate() to deactivate the object.

Parameters:

target - the object to unexport.

Throws:

NoSuchObjectException

getTie

public static Tie getTie(Remote target)

Returns the tie (if any) for a given target object.

Returns:

the tie or null if no tie is registered for the given target.

createValueHandler

public static ValueHandler createValueHandler()

Returns a singleton instance of a class that implements the ValueHandler interface.

Returns:

a class which implements the ValueHandler interface.

getCodebase

public static String getCodebase(Class clz)

Returns the codebase, if any, for the given class.

Parameters:

clz - the class to get a codebase for.

Returns:

a space-separated list of URLs, or null.

loadClass

public static Class loadClass(String className,
                              String remoteCodebase,
                              ClassLoader loader)
                       throws ClassNotFoundException

Returns a class instance for the specified class.

The spec for this method is the "Java to IDL language mapping", ptc/00-01-06.

In Java SE Platform, this method works as follows:

• Find the first non-null ClassLoader on the call stack and attempt to load the class using this ClassLoader.
• If the first step fails, and if remoteCodebase is non-null and useCodebaseOnly is false, then call java.rmi.server.RMIClassLoader.loadClass(remoteCodebase, className).
• If remoteCodebase is null or useCodebaseOnly is true, then call java.rmi.server.RMIClassLoader.loadClass(className).
• If a class was not successfully loaded by step 1, 2, or 3, and loader is non-null, then call loader.loadClass(className).
• If a class was successfully loaded by step 1, 2, 3, or 4, then return the loaded class, else throw ClassNotFoundException.

Parameters:

className - the name of the class.

remoteCodebase - a space-separated list of URLs at which the class might be found. May be null.

loader - a ClassLoader that may be used to load the class if all other methods fail.

Returns:

the Class object representing the loaded class.

Throws:

ClassNotFoundException - if class cannot be loaded.

isLocal

public static boolean isLocal(Stub stub)
                       throws RemoteException

The isLocal method has the same semantics as the ObjectImpl._is_local method, except that it can throw a RemoteException. The _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.

Parameters:

stub - the stub to test.

Returns:

The _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 _is_local() method returns false otherwise. The default behavior of _is_local() is to return false.

Throws:

RemoteException - The Java to IDL specification does not specify the conditions that cause a RemoteException to be thrown.

wrapException

public static RemoteException wrapException(Throwable orig)

Wraps an exception thrown by an implementation method. It returns the corresponding client-side exception.

Parameters:

orig - the exception to wrap.

Returns:

the wrapped exception.

copyObjects

public static Object[] copyObjects(Object[] obj,
                                   ORB orb)
                            throws RemoteException

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.

Parameters:

obj - the objects to copy or connect.

orb - the ORB.

Returns:

the copied or connected objects.

Throws:

RemoteException - if any object could not be copied or connected.

copyObject

public static Object copyObject(Object obj,
                                ORB orb)
                         throws RemoteException

Copies or connects an object. Used by local stubs to copy an actual parameter, result object, or exception.

Parameters:

obj - the object to copy.

orb - the ORB.

Returns:

the copy or connected object.

Throws:

RemoteException - if the object could not be copied or connected.