Check the last paragraph of
http://jibx.sourceforge.net/tutorial/binding-collects.html#ids and the
linked http://jibx.sourceforge.net/extras.html#ididref I think that
gives you what you need.
- Dennis
Ross Bagley wrote:
I'm trying to map an object model to XML that happens to have multiple
collection references to a particular class. However, there does not appear to
be support for using the 'ident' capability on a 'collection of references'
property.
Here's a simplified description of the actual case. I'm managing SQL metadata
(simplified: just tables, varchar columns, and indices). Relationship
semantics are: 1) tables have columns and indices 2) indices refer to columns.
public class Table {
public String name;
public List columns;
public Set indices;
}
public class Column {
public String name;
public int size;
}
public class Index {
public String name;
public boolean unique;
public List columns;
}
Here is the JiBX binding XML for the table and column:
<binding>
<mapping name="table" value-style="attribute" class="Table">
<value name="name" field="name"/>
<collection field="columns" item-type="Column"
factory="ListFactory.create"/>
<collection field="indices" item-type="Index" factory="SetFactory.create"/>
</mapping>
<mapping name="column" value-style="attribute" class="Column">
<value name="name" field="name" ident="def"/>
<value name="size" field="size"/>
</mapping>
Pretty simple stuff. But how to bind the index's collection of columns? Since
it's a collection property, I can't use a "value" element to bind it, and
"collection" and "structure" elements don't offer an "ident" attribute (yet).
But maybe it's just undocumented...
Here was attempt #1 (ident attribute on collection):
<mapping name="index" value-style="attribute" class="Index">
<value name="name" field="name"/>
<value name="unique" field="unique"/>
<collection field="columns" item-type="Column" ident="ref"
factory="ListFactory.create"/>
</mapping>
Which resulted in a warning during binding (the 'line' and 'col' values in the
actual warning are '0'):
"Warning: Undefined attribute ident for collection element at (line 0, col 0)"
And, given the failure during the binding, a predictable exception is thrown
during unmarshalling:
org.jibx.runtime.JiBXException: Duplicate ID definition (line 11, col 89, in
UTF-8)
Here's attempt #2 (ident attribute on structure):
<mapping name="index" value-style="attribute" class="Index">
<value name="name" field="name"/>
<value name="unique" field="unique"/>
<collection field="columns" factory="ListFactory.create">
<structure name="column" type="Column" ident="ref"/>
</collection>
</mapping>
Which resulted in a similar warning:
"Warning: Undefined attribute ident for structure element at (line 0, col 0)"
And the exact same exception is thrown during unmarshalling.
In desperation, I did try one other thing. Attempt #3:
<mapping name="index" value-style="attribute" class="Index">
<value name="name" field="name"/>
<value name="unique" field="unique"/>
<collection field="columns" factory="ListFactory.create">
<structure name="column" type="Column">
<value name="name" field="name" ident="ref"/>
</structure>
</collection>
</mapping>
Which failed because Column.name is a String and not a reference to a Column
object...
So I'm stuck for the moment, unless there's some approach that I missed in
reading the documentation (which I've now read through a few times).
Regards,
Ross
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