Re: [Simple-support] Deserialisation of XML document with multiple namespaces

[Dave M. <dav...@gm...>]

Hmm,

I have been trying this, and have used the Visitor implementation 
elsewhere, but the exception being thrown regarding the 'sub_element' 
element being declared twice happens before the visitor, (and a default 
VisitorStrategy) has an opportunity to intercept the processing.

The stack trace is thus...

org.simpleframework.xml.core.PersistenceException: Element 'thing' 
declared twice at line 10
     at 
org.simpleframework.xml.core.Variable$Adapter.read(Variable.java:444)
     at 
org.simpleframework.xml.core.Variable$Adapter.read(Variable.java:422)
     at 
org.simpleframework.xml.core.Composite.readVariable(Composite.java:679)
     at 
org.simpleframework.xml.core.Composite.readInstance(Composite.java:627)
     at org.simpleframework.xml.core.Composite.readUnion(Composite.java:602)
     at 
org.simpleframework.xml.core.Composite.readElement(Composite.java:585)
     at 
org.simpleframework.xml.core.Composite.readElements(Composite.java:502)
     at 
org.simpleframework.xml.core.Composite.readSection(Composite.java:388)
     at org.simpleframework.xml.core.Composite.read(Composite.java:368)
     at 
org.simpleframework.xml.core.Composite.readDefault(Composite.java:262)
     at org.simpleframework.xml.core.Composite.read(Composite.java:232)
     at org.simpleframework.xml.core.Composite.read(Composite.java:202)
     at org.simpleframework.xml.core.Composite.read(Composite.java:150)
     at 
org.simpleframework.xml.core.Composite.readVariable(Composite.java:679)
     at 
org.simpleframework.xml.core.Composite.readInstance(Composite.java:627)
     at org.simpleframework.xml.core.Composite.readUnion(Composite.java:602)
     at 
org.simpleframework.xml.core.Composite.readElement(Composite.java:585)
     at 
org.simpleframework.xml.core.Composite.readElements(Composite.java:502)
     at 
org.simpleframework.xml.core.Composite.readSection(Composite.java:388)
     at org.simpleframework.xml.core.Composite.read(Composite.java:368)
     at 
org.simpleframework.xml.core.Composite.readDefault(Composite.java:262)
     at org.simpleframework.xml.core.Composite.read(Composite.java:232)
     at org.simpleframework.xml.core.Composite.read(Composite.java:202)
     at org.simpleframework.xml.core.Composite.read(Composite.java:150)
     at org.simpleframework.xml.core.Traverser.read(Traverser.java:92)
     at org.simpleframework.xml.core.Persister.read(Persister.java:632)
     at org.simpleframework.xml.core.Persister.read(Persister.java:613)
     at org.simpleframework.xml.core.Persister.read(Persister.java:591)
     at org.simpleframework.xml.core.Persister.read(Persister.java:550)
     at 
test.SimpleXmlDeserialisationTest.loadXml(SimpleXmlDeserialisationTest.java:40)
    ...

The problem appears to be that the stack of registered elements does not 
take into account the namespace, and I cannot see how you can deal with 
this.  Should this really be an enhancement/bug, as the XML is perfectly 
valid.

For the moment I have managed to find a potential work around, by 
declaring just one java class as a list of inline elements, and then 
resolving what I need to do at validate/commit time as necessary.

Regards

Dave Mellors

> Subject:
> Re: [Simple-support] Deserialisation of XML document with multiple 
> namespaces
> From:
> Niall Gallagher <gal...@ya...>
> Date:
> Mon, 9 May 2011 19:38:08 -0700 (PDT)
>
> To:
> sim...@li..., Dave Mellors 
> <dav...@gm...>
>
>
> You will have to use a Visitor for this. This will allow you to apply namespaces without the use of annotations. There are examples of Visitors in the test cases and in the tutorial.
>
> --- On Mon, 9/5/11, Dave Mellors<dav...@gm...>  wrote:
>
> >  From: Dave Mellors<dav...@gm...>
> >  Subject: [Simple-support] Deserialisation of XML document with multiple namespaces
> >  To:sim...@li...
> >  Received: Monday, 9 May, 2011, 9:43 AM
> >  Hi,
> >  
> >  I am attempting to read an xml document which has common
> >  element names
> >  across namespaces.
> >  
> >  <content>
> >  <element>
> >  <name/>
> >  <xy1:sub_element xmlns:xy1="http://www.xxx.com">
> >  <xy1:detail_1/>
> >  <xy1:detail_2/>
> >  </xy1:sub_element>
> >  <xy2:sub_element xmlns:xy2="http://www.yyy.com">
> >  <xy2:something_else/>
> >  <xy2:something_different/>
> >  </xy2:sub_element>
> >  </element>
> >  </content>
> >  
> >  I have tried many ways to resolve this, but come up with
> >  errors which
> >  ever way I go, e.g. duplicate annotation in the java class
> >  
> >  public class XmlElement {
> >  
> >            private String
> >  name;
> >  
> >  
> >      @Element(name="sub_element")
> >  
> >      @Namespace(prefix="xy1", reference="http://www.xxz.com)")
> >            private ThingOne
> >  thingOne;
> >  
> >  
> >      @Element(name="sub_element")
> >  
> >      @Namespace(prefix="xy2", reference="http://www.xxz.com)")
> >            private ThingTwo
> >  thingTwo;
> >  }
> >  
> >  Any ideas as to how this should be done?  If I comment
> >  out the
> >  'thingTwo' sub_element, it fails with an exception
> >  indicating that the
> >  element 'sub_element' has been declared twice, which seems
> >  to indicate
> >  it is ignoring the namespace?
> >  
> >  Thanks in anticipation of a solution.
> >  
> >  Dave Mellors
> >  
> >