java.rmi

Class MarshalledObject<T>

Implemented Interfaces:
Serializable

public final class MarshalledObject<T>
extends Object
implements Serializable

A MarshalledObject consists of a serialized object which is marshalled according to the RMI specification.

An object passed to the constructor is serialized and tagged with the needed URL to retrieve its class definition for remote usage. If the object is a remote reference its stub is serialized instead. The instance of this marshalled object can be later retrieved by its get() method.

See Also:
Serialized Form

Constructor Summary

MarshalledObject(T obj)
Constructs a MarshalledObject from the given object.

Method Summary

boolean
equals(Object obj)
Checks if the given object is equal to this marshalled object.
T
get()
Constructs and returns a copy of the internal serialized object.
int
hashCode()
Get a value that represents this Object, as uniquely as possible within the confines of an int.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MarshalledObject

public MarshalledObject(T obj)
            throws IOException
Constructs a MarshalledObject from the given object.
Parameters:
obj - the object to marshal
Throws:
IOException - if an I/O error during serialization occurs.

Method Details

equals

public boolean equals(Object obj)
Checks if the given object is equal to this marshalled object.

Marshalled objects are considered equal if they contain the same serialized object. Codebase annotations where the class definition can be downloaded are ignored in the equals test.

Overrides:
equals in interface Object
Parameters:
obj - the object to compare.
Returns:
true if equal, false otherwise.

get

public T get()
            throws IOException,
                   ClassNotFoundException
Constructs and returns a copy of the internal serialized object.
Returns:
The deserialized object.
Throws:
IOException - if an I/O exception occurs during deserialization.
ClassNotFoundException - if the class of the deserialized object cannot be found.

hashCode

public int hashCode()
Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

  • Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
  • It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

Overrides:
hashCode in interface Object
Returns:
the hash code for this Object

MarshalledObject.java -- Copyright (c) 1996, 1997, 1998, 1999, 2004, 2006 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath 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 for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.