Package java.rmi

Source Code of java.rmi.MarshalledObject

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package java.rmi;



* A <code>MarshalledObject</code> consists of a serialized object which is
* marshalled according to the RMI specification.
* <p>
* 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 <code>get()</code> method.
* </p>
* @author unknown
public final class MarshalledObject<T>
  implements Serializable
  // The following fields are from Java API Documentation "Serialized form"
  private static final long serialVersionUID = 8988374069173025854L;

  byte[] objBytes;
  byte[] locBytes;
  int hash;

   * Constructs a <code>MarshalledObject</code> from the given object.
   * @param obj the object to marshal
   * @throws IOException if an I/O error during serialization occurs.
  public MarshalledObject(T obj) throws IOException
    ByteArrayOutputStream objStream = new ByteArrayOutputStream();
    RMIMarshalledObjectOutputStream stream =
      new RMIMarshalledObjectOutputStream(objStream);
    objBytes = objStream.toByteArray();
    locBytes = stream.getLocBytes();

    // The following algorithm of calculating hashCode is similar to String
    hash = 0;
    for (int i = 0; i < objBytes.length; i++)
      hash = hash * 31 + objBytes[i];
    if (locBytes != null)
      for (int i = 0; i < locBytes.length; i++)
        hash = hash * 31 + locBytes[i];

   * Checks if the given object is equal to this marshalled object.
   * <p>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.</p>
   * @param obj the object to compare.  
   * @return <code>true</code> if equal, <code>false</code> otherwise.
  public boolean equals(Object obj)
    if (! (obj instanceof MarshalledObject))
      return false;

    // hashCode even differs, don't do the time-consuming comparisons
    if (obj.hashCode() != hash)
      return false;

    MarshalledObject aobj = (MarshalledObject) obj;
    if (objBytes == null || aobj.objBytes == null)
      return objBytes == aobj.objBytes;
    if (objBytes.length != aobj.objBytes.length)
      return false;
    for (int i = 0; i < objBytes.length; i++)
        if (objBytes[i] != aobj.objBytes[i])
          return false;
    // Ignore comparison of locBytes(annotation)
    return true;

   * Constructs and returns a copy of the internal serialized object.
   * @return The deserialized object.
   * @throws IOException if an I/O exception occurs during deserialization.
   * @throws ClassNotFoundException if the class of the deserialized object
   * cannot be found.
  public T get() throws IOException, ClassNotFoundException
    if (objBytes == null)
      return null;
    RMIMarshalledObjectInputStream stream =
      new RMIMarshalledObjectInputStream(objBytes, locBytes);
    return (T) stream.readObject();

  public int hashCode()
    return hash;


Related Classes of java.rmi.MarshalledObject

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