To add to my last posting:
The Castor mapping is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<mapping>
<!--
=================================================================== -->
<!-- Mapping for class com.adminserver.dcl.ClientDcl -->
<!--
=================================================================== -->
<class name="com.adminserver.dcl.ClientDcl" identity="clientGuid"
access="shared"
auto-complete="false">
<map-to table="AsClient" xml="AsClient"/>
<field name="clientGuid" type="string"
get-method="getClientGuid"
set-method="setClientGuid"
handler="com.adminserver.utl.MyGuidHandler">
<bind-xml name="ClientGUID" node="element"/>
</field>
<field name="firstName" type="string" get-method="getFirstName"
set-method="setFirstName">
<bind-xml name="FirstName" node="element"/>
</field>
<field name="lastName" type="string" get-method="getLastName"
set-method="setLastName">
<bind-xml name="LastName" node="element"/>
</field>
<field name="fields" type="com.adminserver.dcl.ClientFieldDcl"
get-method="getFields"
set-method="setFields" collection="map">
<bind-xml name="AsClientField" node="element"
location="Fields">
<class name="org.exolab.castor.mapping.MapItem">
<field name="key" type="java.lang.String" >
<bind-xml name="key"/>
</field>
<field name="value"
type="com.adminserver.dcl.ClientFieldDcl">
<bind-xml name="value"/>
</field>
</class>
</bind-xml>
</field>
</class>
<!--
=================================================================== -->
<!-- Mapping for class com.adminserver.dcl.ClientFieldDcl -->
<!--
=================================================================== -->
<class name="com.adminserver.dcl.ClientFieldDcl"
identity="clientGuid fieldName"
access="shared" auto-complete="false">
<map-to table="AsClientField" xml="AsClientField"/>
<field name="clientGuid" type="string"
get-method="getClientGuid"
set-method="setClientGuid">
<bind-xml name="ClientGUID" node="element"
reference="true"/>
</field>
<field name="fieldName" type="string" get-method="getFieldName"
set-method="setFieldName">
<bind-xml name="FieldName" node="element"/>
</field>
<field name="textValue" type="string" get-method="getTextValue"
set-method="setTextValue">
<bind-xml name="TextValue" node="element"/>
</field>
</class>
</mapping>
The "Unable to resolve ID for instance of class 'java.lang.String' due
to the following error: Unable to resolve ClassDescriptor" Exception
occurs because of:
<field name="clientGuid" type="string" get-method="getClientGuid"
set-method="setClientGuid">
<bind-xml name="ClientGUID" node="element"
reference="true"/>
</field>
Do I need to change the type="string" to
type="com.adminserver.dcl.ClientDcl" ? But doing so gives the Exception
"org.exolab.castor.mapping.MappingException: The return type for method
public java.lang.String
com.adminserver.dcl.ClientFieldDcl.getClientGuid() does not match the
declared field type com.adminserver.dcl.ClientDcl"
So, How does one use the reference="true" attribute???
Any help appreciated.
Thanks in advance,
Sandeep Khanna
On Fri, 2006-01-06 at 12:16 -0500, Sandeep Khanna wrote:
> On Thu, 2006-01-05 at 22:29 -0600, Keith Visco wrote:
> > You can create a custom field handler to be your GUID generator.
> >
> > And then use the following mapping:
> >
> > <class name="...ClientDcl" identity="clientGUID">
> > <map-to xml="ClientDcl"/>
> > ...
> > <field name="clientGUID" handler="MyGUIDHandler"/>
> > <bind-xml name="ClientGUID"/>
> > </field>
> > ...
> > </class>
> >
> > Once you have your GUID generator working you can then add the following
> > to your mapping file:
> >
> > <class name="...AddressRoleDcl">
> > <map-to xml="AddressRoleDcl"/>
> > ...
> > <field name="clientGUID" reference="true">
> > <bind-xml name="ClientGUID" node="element"/>
> > </field>
> > ...
> > </class>
>
> After doing like the above suggested, I get the following exception:
>
> [DEBUG]: (TestXMLBindingFramework.testCastor:75) - Unmarshalling AsXML
> to ClientDcl...
> [DEBUG]: (MyGuidHandler.convertUponSet:38) - original setValue value =
> [DEBUG]: (MyGuidHandler.convertUponSet:40) - new setValue value =
> 48EBBAAC-F551-9937-D4C4-0D80407FA9B4
> [DEBUG]: (TestXMLBindingFramework.testCastor:79) - Unmarshalling
> successful in 202 milliseconds.
> [DEBUG]: (TestXMLBindingFramework.testCastor:84) - Marshalling ClientDcl
> to AsXML ...
> Unable to resolve ID for instance of class 'java.lang.String' due to the
> following error: Unable to resolve ClassDescriptor.
> at org.exolab.castor.xml.Marshaller.getObjectID(Marshaller.java:2009)
> at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:1649)
> at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:1852)
> at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:1852)
> at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:1835)
> at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:842)
> at TestXMLBindingFramework.testCastor(TestXMLBindingFramework.java:86)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:324)
> at junit.framework.TestCase.runTest(TestCase.java:154)
> at junit.framework.TestCase.runBare(TestCase.java:127)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:118)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
>
> As u can see, the GUID gets generated & also prints out while
> marshalling without the reference="true" attribute in the Castor
> mapping. But, as soon as u put in reference="true" on the bind-xml
> element, it all blows up!
>
>
> import org.apache.log4j.Logger;
> import org.exolab.castor.mapping.GeneralizedFieldHandler;
>
> public class MyGuidHandler extends GeneralizedFieldHandler {
>
> Logger logger = Logger.getRootLogger();
>
> /**
> * This method is used to convert the value when the
> * getValue method is called. The getValue method will
> * obtain the actual field value from given 'parent' object.
> * This convert method is then invoked with the field's
> * value. The value returned from this method will be
> * the actual value returned by getValue method.
> *
> * @param value the object value to convert after
> * performing a get operation
> * @return the converted value.
> */
> public Object convertUponGet(Object value) {
> return value;
> }
>
> /**
> * This method is used to convert the value when the
> * setValue method is called. The setValue method will
> * call this method to obtain the converted value.
> * The converted value will then be used as the value to
> * set for the field.
> *
> * @param value the object value to convert before
> * performing a set operation
> * @return the converted value.
> */
> public Object convertUponSet(Object value) {
> logger.debug( "original setValue value = " + value );
> value = new GuidGeneratorUtl().toString();
> logger.debug( "new setValue value = " + value );
> return value;
> }
>
> /**
> * Returns the class type for the field that this
> * GeneralizedFieldHandler converts to and from. This
> * should be the type that is used in the
> * object model.
> *
> * @return the class type of of the field
> */
> public Class getFieldType() {
> return String.class;
> }
>
> }
>
>
>
>
> >
> >
> > Keep in mind that your handler (your GUID generator) will need to keep
> > track of GUIDs during the marshalling for each object that it generates
> > a GUID for so that when the handler is called again for the same object
> > it will return the correct GUID for that object as your handler will get
> > called each time it needs to output the GUID. This will be once for the
> > object itself and then once for each reference to the object.
> >
> > For help on creating a custom FieldHandler please see the website.
> >
> > --Keith
> >
> >
> >
> >
> >
> > Sandeep Khanna wrote:
> > > Hi All,
> > >
> > > Given the following visual representation of Object relationships & the
> > > relevant Castor mapping:
> > >
> > > ClientDcl
> > > |-ClientGUID
> > > |-FirstName
> > > |-LastName
> > > |-...
> > > |-AddressRoleDcl
> > > |-AddressRoleGUID
> > > |-ClientGUID
> > > |-AddressGUID
> > > |-...
> > > |-AddressDcl
> > > |-AddressGUID
> > > |-...
> > >
> > > I would like to unmarshall the following XML:
> > >
> > > <?xml version="1.0" encoding="UTF-8"?>
> > > <AsClient>
> > > <ClientGUID/>
> > > <FirstName>Sandeep</FirstName>
> > > <LastName>Khanna</LastName>
> > > <Fields>
> > > <AsClientField>
> > > <ClientGUID/>
> > > <FieldName>ExtraFieldName</FieldName>
> > > <FieldTypeCode>02</FieldTypeCode>
> > > <TextValue>ExtraFieldValue</TextValue>
> > > </AsClientField>
> > > </Fields>
> > > <AddressRoles> <!-- Map -->
> > > <AsAddressRole> <!-- value -->
> > > <AddressRoleGUID/>
> > > <AddressGUID/>
> > > <ClientGUID/>
> > > <AddressRoleCode>2</AddressRoleCode> <!-- key -->
> > > <AsAddress>
> > > <AddressGUID/>
> > > <AddressLine1>81 ALEXANDRA DRIVE</AddressLine1>
> > > <AddressLine2/>
> > > <AddressLine3/>
> > > <addressLine4/>
> > > <City>NEW BRITIAN</City>
> > > <StateCode>07</StateCode>
> > > <CountryCode/>
> > > <PostalID>06789</PostalID>
> > > <Fields>
> > > <AsAddressField>
> > > <ClientGUID/>
> > > <FieldName/>
> > > <FieldTypeCode>02</FieldTypeCode>
> > > <TextValue/>
> > > </AsAddressField>
> > > </Fields>
> > > </AsAddress>
> > > </AsAddressRole>
> > > </AddressRoles>
> > > </AsClient>
> > >
> > > We have a GUIDGeneratorUtl class that creates unique GUIDs. We would
> > > like to use it from within the Castor framework to generate the GUID and
> > > set it in the above Object relationships.
> > >
> > > Questions:
> > > 1) How do I setup/use a GUID generator class from within the Castor
> > > mapping file.
> > > 2) As per the above visual Object relationship, we would require the
> > > ClientGUID that was generated and set on the ClientDcl object to be used
> > > while setting the ClientGUID attribute on the AddressRoleDcl object
> > > contained in the ClientDcl instance.
> > > 3) As per the above visual Object relationship,
> > > AddressRoleDcl.AddressGUID needs to be set from the
> > > AddressDcl.AddressGUID which would be generated only after we unmarshall
> > > or parse the AddressDcl element/node. One way would be to unmarshall the
> > > AddressDcl element/node first to have the AddressGUID ready before
> > > unmarshalling AddressRoleDcl element/node.
> > >
> > > Any comments, suggestions, pointers would be helpful.
> > >
> > > --Sandeep Khanna
> > >
> > >
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> >
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