Hi,
Here is a reply from Keith few days ago that might interest you:
Thanks,
Arnaud
> Arvind Gudipati wrote:
>
> Im sorry if someone has already asked this question earlier!
>
> I was trying to map the XML of the form below (xml not complete)
> .....
> <Item id="001">
> <name> abc-001 </name>
> </Item>
>
> <Item id="002">
> <name> abc-002 </name>
> </Item>
>
> to a java collection object java.util.Hashtable with
> "item id" as key and Item object as value.
>
> I read through the documentation for Castor mapping of XML to java
> objects. It said and i quote:
> "For hashtable and map, Castor will add an object with put(object,
> object): the object is both the key and the value. This will be
> improved in the future."
>
> Is there any work around for this problem? Is it already fixed? If not
> any ideas when it will be fixed?
Hi Arvind, the behavior is still the same. There are a few workarounds,
However.
1. Abstract your collection by creating an add method for it:
public void addItem(Item item) {
items.put(item.getId(), item);
}
2. If you can't change your object model then, if you use the CVS
version of Castor,
you can write you own FieldHandler as a work around:
Assuming your class which holds the items is called Foo:
import org.exolab.castor.mapping.FieldHandler;
import org.exolab.castor.mapping.ValidityException;
/**
* The FieldHandler for the "item" field of the Foo class
**/
public class ItemFieldHandler
implements org.exolab.castor.mapping.FieldHandler
{
/**
* Creates a new ItemFieldHandler
**/
public ItemFieldHandler() {
super();
}
/**
* Returns the value of the field from the object.
*
* @param object The object
* @return The value of the field
* @throws IllegalStateException The Java object has changed and
* is no longer supported by this handler, or the handler is not
* compatiable with the Java object
*/
public Object getValue( Object object )
throws IllegalStateException
{
return ((Foo)object).getItems();
}
/**
* Sets the value of the field on the object.
*
* @param object The object
* @param value The new value
* @throws IllegalStateException The Java object has changed and
* is no longer supported by this handler, or the handler is not
* compatiable with the Java object
* @thorws IllegalArgumentException The value passed is not of
* a supported type
*/
public void setValue( Object object, Object value )
throws IllegalStateException, IllegalArgumentException
{
Hashtable items = ((Foo)object).getItems();
items.put( ((Item)value).getId(), value);
}
/**
* Sets the value of the field to a default value.
* <p>
* Reference fields are set to null, primitive fields are set to
* their default value, collection fields are emptied of all
* elements.
*
* @param object The object
* @throws IllegalStateException The Java object has changed and
* is no longer supported by this handler, or the handler is not
* compatiable with the Java object
*/
public void resetValue( Object object )
throws IllegalStateException, IllegalArgumentException
{
((Foo)object).getItems().clear();
}
/**
* @deprecated No longer supported
*/
public void checkValidity( Object object )
throws ValidityException, IllegalStateException
{
//-- add validation check if desired
}
/**
* Creates a new instance of the object described by this field.
*
* @param parent The object for which the field is created
* @return A new instance of the field's value
* @throws IllegalStateException This field is a simple type and
* cannot be instantiated
*/
public Object newInstance( Object parent )
throws IllegalStateException
{
return new Hashtable();
}
}
>
> Any help is sincerely appreciated!
Hopefully one of those work arounds will work for you.
Thanks,
--Keith
-> -----Original Message-----
-> From: Isabelle Sieuv [mailto:[EMAIL PROTECTED]]
-> Sent: Tuesday, December 11, 2001 10:30 AM
-> To: [EMAIL PROTECTED]
-> Subject: [castor-dev] XML Data Binding
->
->
-> Hi All,
->
-> Could you tell me if it is possible to do a data binding from an
-> hashtable
-> instead of java bean ?
->
-> Any help will be greatly appreciated.
-> Best regards,
->
-> Isabelle S.
-> Email: [EMAIL PROTECTED]
->
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