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List:       jibx-users
Subject:    Re: [jibx-users] Collection of object references?
From:       Dennis Sosnoski <dms () sosnoski ! com>
Date:       2005-06-01 22:17:12
Message-ID: 429E33E8.8080204 () sosnoski ! com
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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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