Sumanta-
This type of behavior is actually quite easy with Castor. I used your
Container class and created two dummy classes, ClassA and ClassB (one
contains a string, the other a double). I then wrote up a mapping file
(see below), and a driver that creates two containers, puts them in an
ArrayList, marshalls them out and unmarshalls them back in.
Here's the mapping file:
<mapping>
<class name="Container">
<map-to xml="container"/>
<field name="containerId" type="string">
<bind-xml name="id" node="attribute" />
</field>
<field name="holderObj">
<bind-xml name="child" />
</field>
</class>
<class name="ClassA">
<field name="str1" type="string" direct="true">
<bind-xml name="string" node="attribute" />
</field>
</class>
<class name="ClassB">
<field name="dbl1" type="double" direct="true">
<bind-xml name="pi" node="attribute" />
</field>
</class>
</mapping>
Just a note, the class names need to be fully qualified (I cheated in
this case). And here's the output xml:
<?xml version="1.0" encoding="UTF-8"?>
<array-list xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<container id="Container1">
<child string="Class A String" xsi:type="class-a"/>
</container>
<container id="Container2">
<child pi="3.141592653589793" xsi:type="class-b"/>
</container>
</array-list>
Castor correctly unmarshalled the XML into objects with no problem. If
you want the xml to change based on the "contained" classes, you can
look into the auto-naming attribute (bind-xml element) in the mapping
documentation:
http://castor.codehaus.org/xml-mapping.html
HTH,
Stephen
Sumanta Ranjan Das wrote:
Hi,
I have my object hierarchy that represents a container which in turn can
hold any type of other uder-defined objects. e.g. the following
Container object looks like
public class Container {
private String containerId ;
private Object holderObj ;
public String getContainerId()
{
return containerId ;
}
public void setContainerId(String id)
{
containerId = id ;
}
public Object getHolderObj()
{
return holderObj ;
}
public void setHolderObj(Object obj)
{
holderObj = obj;
}
}
I have 2 holder objects (A and B) which are altogether different in
terms of relationship.
In one case when i create Container object, i could do
container.setHolderObj (A aObject)
whereas in other case, i would be doing
container.setHolderObj (B bObject)
In such a case how do i define the mapping file for Container class as
there is no explicit reference to either of A or B object in the
Container class. All i know is that Container can contain either of A or
B during the runtime.
Does castor XML support such object structures? Can anyone share an
example for the mapping file in case it's already supported?
Thanks and regards,
Sumanta
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