[castor-dev] Question about using non-default concrete class constructor

[M Singh]

Hi All:

I am new to Castor and I am using it in one of my projects.  I am stuck with
a problem of using a non default constructor for a field specified as
interface (see below).  I know we can use xsi:type in the xml to specify the
concrete implementation of the interface.  But I have not been able to
specify the value to intialize the concrete instance ?  If I use the value
in the element text (as shown below) - I get an exception:

org.xml.sax.SAXException: Illegal Text data found as child of processor


The text indicated in the exception is actually the value with which I'd
like to initialize the object ?

Here is a sample scenario from Castor's documentation:

Java class:

           public interface IProcessor
            {
              public void process();
            }
            ..
            public class Engine
            {
              private IProcessor processor;
              public IProcessor getProcessor()
              {
                return processor;
              }
              public void setProcessor(IProcessor processor)
              {
                this.processor = processor;
              }
            }

A typical mapping file for such a design may be:

            <mapping>
              <class name="Engine">

                <map-to xml="engine" />

                <field name="processor" type="IProcessor" required="true">
                 <bind-xml name="processor" node="element" />
                </field>

              </class>
            </mapping>

XML file:
...
            <engine>
              <processor xsi:type="java:com.abc.MyProcessor" />
            </engine>
...

In my case com.abc.MyProcessor has no default constructors.  I tried:

            <engine>
              <processor xsi:type="java:com.abc.MyProcessor">abc</processor>
            </engine>

to initialize MyProcessor with the data "abc"

But this results in the above mentioned exception.

Any suggestions would be greatly appreciated.

Thanks.

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