commonj.sdo.impl
Class ExternalizableDelegator

java.lang.Object
  commonj.sdo.impl.ExternalizableDelegator

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable

public class ExternalizableDelegator
extends java.lang.Object
implements java.io.Externalizable

Delegates DataObject serialization while ensuring implementation independent java.io.Serialization. An implementation of DataObject returns an ExternalizableDelegator from its writeReplace() method. The root DataObject is the object returned from do.getRootObject() where do is the DataObject being serialized in a java.io.ObjectOutputStream. When do.getContainer() == null then do is a root object. The byte format for each DataObject in the stream is: [0] [path] [root] // when do is not a root object [1] [rootXML] // when do is a root object where: [0] is the byte 0, serialized using writeByte(0). [1] is the byte 1, serialized using writeByte(1). [path] is an SDO path expression from the root DataObject to the serialized DataObject such that root.getDataObject(path) == do. Serialized using writeUTF(path). [root] is the root object serialized using writeObject(root). [rootXML] is the GZip of the XML serialization of the root DataObject. The XML serialization is the same as XMLHelper.INSTANCE.save(root, "commonj.sdo", "dataObject", stream); where stream is a GZIPOutputStream, length is the number of bytes in the stream, and bytes are the contents of the stream. Serialized using writeInt(length), write(bytes).

See Also:

Serialized Form

Nested Class Summary

static interface

ExternalizableDelegator.Resolvable

Constructor Summary

ExternalizableDelegator()

ExternalizableDelegator(java.lang.Object target)

Method Summary

void	readExternal(java.io.ObjectInput in)
java.lang.Object	readResolve()
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExternalizableDelegator

public ExternalizableDelegator()

ExternalizableDelegator

public ExternalizableDelegator(java.lang.Object target)

Method Detail

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Throws:

java.io.IOException

java.lang.ClassNotFoundException

readResolve

public java.lang.Object readResolve()
                             throws java.io.ObjectStreamException

Throws:

java.io.ObjectStreamException