Re: [Simple-support] Asymmetry in Persister behaviour

[Niall G. <gal...@ya...>]

Hi,

I have written a demonstration here.

https://simple.svn.sourceforge.net/svnroot/simple/trunk/download/stream/src/test/java/org/simpleframework/xml/convert/HideEnclosingConverterTest.java

It shows how to do it.

Niall

--- On Wed, 12/1/11, Pete Calvert <pr...@ca...> wrote:

> From: Pete Calvert <pr...@ca...>
> Subject: Re: [Simple-support] Asymmetry in Persister behaviour
> To: "Niall Gallagher" <gal...@ya...>, sim...@li...
> Received: Wednesday, 12 January, 2011, 2:23 AM
> Hi,
> 
> Yep ok. I should have thought of that, thank you. And
> there's no way to make them consistent without the child
> node? As is, "@Element Key<Foo> foo" is going to end
> up looking like:
> 
> <foo><foo>...</foo></foo>
> 
> If the only way is by making some changes, then I'm happy
> to make them if you think this is worthwhile. I don't really
> know my way around the code, but I think the following would
> do it:
> 
> - Stop Traverser.write(OutputNode, Object, Class) from
> adding the child node itself (i.e. rather than working out a
> name for a child, don't add a child).
> - Add an argument "boolean createChild" to
> Persister.write(Object, OutputNode, ...) methods. Then in
> Persister.write(Object, OutputNode, Context, boolean) add
> the child as before if it is set.
> - Add a new method Persister.write(Object, OutputNode) that
> defaults createChild to true to make this backwards
> compatible (although I would argue that the default should
> actually be false and that write(Object, Writer) should set
> it to true).
> 
> The potential problem is that I don't know whether
> Traverser.write(OutputNode, Object, Class) is used
> elsewhere, or just Traverser.write(OutputNode, Object,
> Class, String).
> 
> Thanks
> Pete
> 
> Niall Gallagher wrote:
> > Hi,
> > 
> > Take a look at the following, it works fine.
> > 
> > https://simple.svn.sourceforge.net/svnroot/simple/trunk/download/stream/src/test/java/org/simpleframework/xml/convert/WrapperTest.java
> > 
> > Niall
> > 
> > --- On Tue, 11/1/11, Pete Calvert <pr...@ca...>
> wrote:
> > 
> >> From: Pete Calvert <pr...@ca...>
> >> Subject: [Simple-support] Asymmetry in Persister
> behaviour
> >> To: sim...@li...
> >> Received: Tuesday, 11 January, 2011, 4:25 PM
> >> Hi,
> >> 
> >> I've noticed that the behaviour of write(Object,
> >> OutputNode) and read(Class, InputNode) is not
> entirely consistent. read
> >> loads directly from the node whereas write first
> creates a new child
> >> (using the name of the object's class) and then
> writes to this.
> >> 
> >> Is there a way of working around this? i.e. write
> writing
> >> directly to the node given?
> >> 
> >> The reason I need this is that I'm trying to
> import/export
> >> Objectify entities. References to other entities
> are stored as
> >> "Key<T>", so I've got a Converter for "Key"
> that 'skips' over the reference
> >> to export the entity in its place. I've included
> some code at the end of
> >> the email that exhibits the behaviour I'm talking
> about.
> >> 
> >> Thanks
> >> Pete
> >> 
> >> ---
> >> 
> >> import org.simpleframework.xml.*;
> >> import org.simpleframework.xml.strategy.*;
> >> import org.simpleframework.xml.convert.*;
> >> import org.simpleframework.xml.core.*;
> >> import org.simpleframework.xml.stream.*;
> >> import java.io.*;
> >> 
> >> public class Test {
> >>    @Root
> >>    public static class Example {
> >>      @Element Foo x;
> >>    }
> >> 
> >>    public static class Foo {
> >>      String val;
> >> 
> >>      public Foo(String x) { val =
> x; }
> >>    }
> >> 
> >>    public static class FooConverter
> >> implements Converter<Foo> {
> >>      public Foo read(InputNode
> node)
> >> throws Exception {
> >>        return new Foo(new
> >> Persister().read(String.class, node));
> >>      }
> >> 
> >>      public void write(OutputNode
> node,
> >> Foo f) throws Exception {
> >>        new
> >> Persister().write(f.val, node);
> >>      }
> >>    }
> >> 
> >>    public static void main(String[]
> args)
> >> throws Exception {
> >>      Registry registry = new
> >> Registry();
> >>      Strategy strategy = new
> >> RegistryStrategy(registry);
> >>      Serializer serializer = new
> >> Persister(strategy);
> >> 
> >>      registry.bind(Foo.class,
> >> FooConverter.class);
> >> 
> >>      Example bla = new Example();
> >>      bla.x = new Foo("test");
> >> 
> >>      serializer.write(bla, new
> >> File("example.xml"));
> >>      serializer.read(Example.class,
> new
> >> File("example.xml"));
> >>    }
> >> }
> >> 
> >>
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