"Wu, Gansha" <[EMAIL PROTECTED]> writes:
> About the serialization of Throwable:
>
> Consider the snippet from Throwable.java:
>
> private void writeObject(java.io.ObjectOutputStream s)
> throws IOException
> {
> ObjectOutputStream.PutField oFields;
> oFields = s.putFields();
> oFields.put("detailMessage", message);
> s.writeFields();
> }
>
> private void readObject(java.io.ObjectInputStream s)
> throws IOException, ClassNotFoundException
> {
> ObjectInputStream.GetField oFields;
> oFields = s.readFields();
> message = (String)oFields.get("detailMessage", (String)null);
> }
>
> here a "detailMessage" field is going to be added to serialized field list
> in ObjectOutputStream.PutField. I understand here we want to keep binary
> compatible with Sun JDK. But what's a pity here is our Throwable has no private
> field named "detailMessage" here, only "message" field. So when come to
> ObjectOutputStream.PutField.put("detailMessage", message):
>
> public PutField putFields () throws IOException
> { ... ...
> currentPutField = new PutField ()
> { ... ...
> public void put (String name, Object value)
> throws IOException, IllegalArgumentException
> {
> ObjectStreamField field
> = currentObjectStreamClass.getField (name);
>
> <- Here return null to "field", and all the following steps will fail
>
> if (value != null &&
> ! field.getType ().isAssignableFrom (value.getClass ()))
> throw new IllegalArgumentException ();
> objs[field.getOffset ()] = value;
> }
> ... ...
> }
> So I wonder if here we could add some mapping mechanisms to map real field
>names
> to serialized strings, e.g: add a member function like:
>
> public void put (String field_name, String serialized_name, Object value)
> throws IOException, IllegalArgumentException
> Let Throwable be wise about the mapping when doing stuff in
>readObject/writeObject.
> I wonder if it will bring more issues in ObjectInputStream.
Is this all to say that ObjectStreamClass.getField (String) can return
null, such that the line
objs[field.getOffset ()] = value;
throws an exception?
I don't understand the mapping problem you're talking about.
Brian
--
Brian Jones <[EMAIL PROTECTED]>
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