Re: Can I override the MimePartSerializer?? - Need Help Soon

[Vamsi Krishna]

hi Scott,

Thank you very much for your reply. I have tried this approach but I can't convert the Image type into a byte array. When i directly pass the image object to the Base64Serializer, i get a class cast exception. So i tried to first convert the image into a byte array and then call the base64serializer's marshall method - and i am stuck here. I couldn't find a way to do that. I tried .toString().getBytes() but it doesn't work. Any clues please?

thanks,
Vamsi.

Scott Nichol wrote:

Unfortunately, DataHandlers are serialized as attachments, and
attachments are always deserialized as DataHandlers.  Therefore, your
deserializer cannot work with the existing Apache SOAP code.

A fairly simple alternative would be to have an Image [de-]serializer
that delegates to the Base64Serializer.  The jpeg gets managed as a byte
array, but you specify the javaType as Image so that the xsi:type
attribute reflects its origins and the byte array can be deserialized to
an Image.  This is not as efficient as the DataHandler (Base64 takes 33%
more space than straight bytes), but it will function with minimal work.

Scott Nichol

----- Original Message -----
From: "Vamsi Krishna" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, January 09, 2003 
10:06 PM
Subject: Can I override the MimePartSerializer?? - Need Help Soon

hi All,

My service has a method -  saveJPEG(String name, java.awt.Image img)
 taking a name and a jpeg image and saving that jpeg with that name in

a

specified directory.
I am using SOAP RPC. Since there is no Serializer/Deserializer for

Image

type, i created my ImageSerializerDeserializer. The DD specifies this
info. The client also does the mapTypes with this info. What I do in
this class is - in the marshall method, i take the Image source,

convert

it into a DataHandler object and call the MimePartSerializer with the
DataHandler object (i simply pass all the other parameters onto
MimePartSerializer - only the src is changed to dhsrc).
In the unmarshall method - i first call the
MimePartSerializer.unmarshall method and get the Bean. Since i know it
is Image, i convert the DataHandler value in this bean to an Image
object and create and return that Image bean.

So the client works fine now - my ImageSerializer's marshall method

gets

called and the call goes through to the Server. The problem is in the
Deserialization. My ImageSerializer class's  unmarshall method is

never

called at the server end. Always the MimePartSerializer.unmarshall is
called and I get a fault saying there is no such method that accepts a
DataHandler - saveJPEG(java.lang.String,javax.activation.DataHandler).

What is the problem here? Is there a way to override the deserializer
for javax.activation.DataHandler? Is my approach correct?
(I know i can have an overloaded method with this signature taking the
data handler and in this method convert the dh to image and call my
original method. But this is not what i am looking for.)


I appreciate any help in this.

thanks a lot in advance,
Vamsi.


The DD entry is -
<isd:map encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
            xmlns:x="urn:xml-soap-j2eeca-soapattach-serverSaveJPEG"
            qname="x:Image"
            javaType="ja
va.awt.Image"

java2XMLClassName="soapattach.soap.serializers.ImageSerializer"

xml2JavaClassName="soapattach.soap.serializers.ImageSerializer" />


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