Raymond Feng wrote:
Please see comments inline.
Raymond
----- Original Message ----- From: "Jean-Sebastien Delfino"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, November 17, 2007 9:59 AM
Subject: Re: Data transformation from/to POJO
Raymond Feng wrote:
Hi,
With the recent development of the online store tutorial, we
encounter quite a few issues around the transformation between POJO
and other databindings (such as XML, JSON).
Yeah :)
Let's take the POJO <--> XML as an example. Here is a set of
questions to be answered.
1) Do we require the POJO to be a strict JavaBean or free-form class?
2) How to read properties from a java object?
The data in a java object can be accessed by the field or by
JavaBean style getter methods. There are different strategies:
a) Always use JavaBean-style getter method
b) Always use field access
c) A combination of a & b
The other factor is the modifier of a field/method defintion. What
modifiers are allowed? public, protected, default and private?
If a property only have getter method, should we dump the property
into the XML? How about transient fields?
3) How to write properties to populate the target POJO instance?
a) Use JavaBean setter?
b) Use field
c) Combination of a & b
Can't we just follow the SDO or JaxB spec?
I don't think that's the case. Both SDO and JAXB have addtional
metadata to help make the decision but POJOs don't. SDO has the
Type/Property while JAXB uses annotations.
Not sure I understand sorry... Yes, I know that SDO and JaxB have
additional metadata, but can't we just follow the SDO or JaxB spec with
respect to deciding between:
a) Use JavaBean setter?
b) Use field
c) Combination of a & b
--
Jean-Sebastien
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