Hello,
I just started to use betwixt for reading XML into JavaBeans (is that
called de-serialization?).
I'm using version 0.6 which appears to be a bit outdated. Nevertheless I
would like to give
some comments:
Simply mapping XML elements into JavaBeans works impressivley well. In
fact I really had
trouble to understand the code I need to analyze because everthing appears
to happen
"automagically".
My problem starts when doing something "not straightforward". It's
probably quite simple
for the experts I guess. All I want to have is a mapping between
<project>
<dependency alias="LOG4j">
<version>1.2.8<version>
<dependency />
</project>
and this Bean:
class Dependency {
..
void setAlias(String s) { .. }
void setVersion(String s) { .. }
};
In other words, the attribute 'alias' shall be mapped to 'setter'
setAlias().
I assume that I need to create a file "Dependency.betwixt" - the
documentation does not
really explain this very well. For example, the tutorial in [1] just
mentions a ".betwixt"
file but will it be a "Channel.betwixt" or a "RSS.betwixt"?? Note
also that there's no
".betwixt" file (whatsoever) in the tutorial's source code directory [2]
(!).
Let's assume now that "Dependency.betwixt" is ok. What should be in this
file??
=> A plain empty file creates an Exception. Why? Wouldn't it be better to
apply to have
a standard mapping this case? There's not a big difference between
an empty file
and a non-existing file (at least not for me).
=> I'm getting similar exceptions in this cases:
a. only <xml> header
b. <info/>
=> I would have expected a kind of warning in this case:
<?xml version="1.0" encoding="UTF-8" ?>
<info>
<element name="non-existing-element">
<addDefaults/>
</element>
</info>
Another thing which is not entirly clear is what should be the 'root'
element for Dependency.betwixt?
Should it be:
<?xml version="1.0" encoding="UTF-8" ?>
<info>
<element name="project">
[..]
</element>
</info>
or should it be
<?xml version="1.0" encoding="UTF-8" ?>
<info>
<element name="dependency">
[..]
</element>
</info>
When looking at the tutorial [1] the latter seems to be the case (and this
appears to be "logical") but
it's not well explained.
Cheers,
Wolfgang.
[1] http://jakarta.apache.org/commons/betwixt/guide/tutorial.html
[2]
http://jakarta.apache.org/commons/betwixt/xref-test/org/apache/commons/betwixt/examples/rss/
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