kumar manish wrote:
Hi All,
I am trying to use castor in my project for XML data
binding. I have generated the source code using
Castor's SourceGeneration utility. First I tried with Descriptor classes and all seemed
to work fine. But I am more inclined towards using
mapping file instead and have less classes compared to what castor generates.
The SourceGenerator takes advantage of the ability to generate it's descriptor classes, some of what castor generates in those descriptor classes cannot easily be expressed in the mapping files.
The mapping files were intended to take existing object models and map them into xml, but they are not yet expressive enough to express XML schema constraints. So by not using the descriptors you're basically throwing away a lot of what is done in them.
So, I generated the mapping file using Castor's
Mapping File generation utility. But this doesn't seem
to work. Mapping file works with very simple
XML messages. But it does not work if you have nested
Choice, Sequence etc in your XSD.
I have searched internet many times but don't see any
example explaining how to deal with nested Choices,
Sequence or other Model groups. There is some blurb on
castor site but there is no example posted.
That's because the mapping file doesn't have the ability to express a choice. Basically with a mapping file you only get "all", support.
I recommend using the descriptors that were generated by Castor instead of trying to do the mapping.
If you really want to reduce the number of classes you can try to use a mix of descriptors and a mapping file. Use the descriptors for the complex cases and use the mapping file to remove the need for the simple descriptors.
--Keith
Does anyone have any working example which involves
Mapping file to deal with Choice, Sequence, or any
other nested Model groups ?
Following is one xsd file where I never got mapping
file to Work.
<xs:element name="EndPoint"> <xs:complexType> <xs:sequence> <xs:element name="ApplicationID" type="xs:string"/> <xs:choice> <xs:element name="EndPointID" type="xs:string"/> <xs:element name="EndPointRef" type="xs:int"/> </xs:choice> </xs:sequence> </xs:complexType> </xs:element>
The Mapping file I am using is :
<class
cst:name="com.blah.blah.cat5.castor.endpoint.EndPoint">
<description>Default mapping for class
com.blah.blah.cat5.castor.endpoint.EndPoint</description>
<map-to cst:xml="EndPoint"
cst:ns-uri="http://blahblah.com/namespace/admin/QueryEndPoint"/>
<field cst:name="applicationID"
cst:type="java.lang.String" cst:required="true">
<bind-xml name="ApplicationID"
node="element"/>
</field>
<field cst:name="endPointSequenceChoice"
cst:type="com.blah.blah.cat5.castor.endpoint.EndPointSequenceChoice"
cst:required="true">
<bind-xml name="-error-if-this-is-used-"
node="element"/>
</field>
</class>
<class
cst:name="com.blah.blah.cat5.castor.endpoint.EndPointSequenceChoice">
<description>Default mapping for class
com.blah.blah.cat5.castor.endpoint.EndPointSequenceChoice</description>
<map-to
cst:ns-uri="http://blahblah.com/namespace/admin/QueryEndPoint"/>
<field cst:name="endPointID"
cst:type="java.lang.String" cst:required="true">
<bind-xml name="EndPointID"
node="element"/>
</field>
<field cst:name="endPointRef" cst:type="int"
cst:required="true">
<bind-xml name="EndPointRef"
node="element"/>
</field>
</class>
Your help in this matter is greatly appreciated. I just hope Castor had better documentation.
Thanks, Manish
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