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Posted to user@commons.apache.org by do...@usbank.com on 2004/12/28 00:17:49 UTC
[betwixt] Re: specifying .betwixt file to use

Robert,

I'm unclear on how to map bean complex attributes.  There is an example on 
the betwixt guide 
(http://jakarta.apache.org/commons/betwixt/guide/reading.html) under the 
topic "Specifying An Implementation Class In The Betwixt File" which is essentially what I need (a Bean containing a List of Beans), 
however it doesn't address how to specify the custom mapping of the nested 
bean -- ExampleImpl in this case.  I'm assuming that a multi-mapping would be the way to do 
this?

The primary piece that is not clear to me is, at the point that the 
Digester gets to the first element that should be a member of the list, 
what is the path-mapping to the root element for the corresponding class 
-- does this need to be specified somewhere?

I've read your post referring to betwixt multi-mappings, but it's not 
clear a) if this has been implemented in the 0.6.1-dev.jar that I'm using, 
and b) exactly what needs to be done to make this work.

I noticed that on the BeanReader's XMLIntrospector property, there is a 
multimappingdigester property.  Does this need to be explicitly set 
somehow?

Here is a code snippet of what I'm implementing.  When I run the code 
below, I'm getting NullPointerException at beanReader.registerMultiMapping().  Please let me know if I'm on the right track here or not.  Thanks in 
advance.

Don

Example XML:

<Envelope>
   <Body>
     <Response>
         <Contract pk="500-0847281-000">
            <ContCustomerCreditAcct>33230373</ContCustomerCreditAcct>
            <Asset pk="153384">
               <AsEquipDesc>COPIER</AsEquipDesc>
            </Asset>
            <Asset pk="153385">
               <AsEquipDesc>COPIER</AsEquipDesc>
            </Asset>
         </Contract>
      </Response>
   </Body>
</Envelope>


.betwixt file:

<?xml version="1.0" encoding="UTF-8"?>
  <betwixt-config>
  <!--name of the class to map -->
   <class name="com.usbank.cw.leasing.valueobjects.buyout.AgmtDetailVO">
                 <element name='Contract' >
                                         <attribute name='pk' 
property='agmtNum'/>
                                        <element name='ContCustomerName' 
property='custName'/>
                                         <element name='ContNumPymtsMade' 
property='pymtsMade'/>
                                         <element 
name='ContCalcPymtSchedule' property='pymtFreq'/>
                                         <element name='ContOriginalTerm' 
property='contractTerm'/>
                                         <element name='Asset' 
property='assets' 
class='com.usbank.cw.leasing.valueobjects.buyout.AssetVO'/>
                                  <addDefaults/>
                 </element>
        </class>
   <class name="com.usbank.cw.leasing.valueobjects.buyout.AssetVO">

                 <element name='Asset' >
                                         <attribute name='pk' 
property='assetNumber'/>
                                        <element name='AsEquipDesc' 
property='equipDesc'/>
                                         <element name='AsModel' 
property='modelNum'/>
                                         <element name='AsSerialNumber' 
property='serialNum'/>
                                         <element name='LocEquipZip' 
property='equipZip'/>
                                  <addDefaults/>
                 </element>
        </class>
  </betwixt-config>


// AgmtDetailVO bean (at element Contract) contains a list of AssetVO beans (at element 
Asset).


                        java.io.File file = new File("test_contract.xml");
                        java.io.FileReader filereader = new java.io.FileReader(file);
                        java.io.FileInputStream fis = new java.io.FileInputStream(file); 

 
                        // Now convert this to a bean using betwixt
                        // Create BeanReader
                        BeanReader beanReader  = new BeanReader();
 
                        // Configure the reader
                        // If you're round-tripping, make sure that the configurations are 
compatible!
 beanReader.getXMLIntrospector().setAttributesForPrimitives(true);
                        beanReader.setMatchIDs(false);
                        //beanReader.getXMLIntrospector();
                        beanReader.addObjectCreate("Envelope/Body/Response/Contract", AgmtDetailVO.class);
                        beanReader.addObjectCreate("Envelope/Body/Response/Contract/Asset", AssetVO.class);
 
                        // Register beans so that betwixt knows what the xml is to be converted to
                        // Since the element mapped to a PersonBean isn't called the same, 
                        // need to register the path as well
                        beanReader.registerMultiMapping(new InputSource(fis));
 
                        // Now we parse the xml
                        AgmtDetailVO agmt = (AgmtDetailVO) 
beanReader.parse(filereader);
 
                        // send bean to system out
                        System.out.println(agmt);

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