Hi!
Of course my code is related to XML:
ObjectMapper om = new XmlMapper();
om.enable(SerializationFeature.INDENT_OUTPUT);
om.registerModule(new JacksonXmlModule() {
@Override
public void setupModule(SetupContext context) {
super.setupModule(context);
context.addBeanSerializerModifier(new
UIElementSerializerModifier());
}
});
public class UIElementSerializerModifier extends XmlBeanSerializerModifier {
@Override
public JsonSerializer<?> modifySerializer(SerializationConfig config,
BeanDescription beanDesc, JsonSerializer<?> serializer) {
if (UIElement.class.isAssignableFrom(beanDesc.getBeanClass())) {
System.out.println(serializer.getClass().getName());
return new BSerializer((BeanSerializerBase) serializer);
}
return serializer;
}
}
public class BSerializer extends XmlBeanSerializer {
public BSerializer(BeanSerializerBase src) {
super(src);
}
@Override
public void serialize(Object bean, JsonGenerator jgen,
SerializerProvider provider) throws IOException {
// The breakpoint on next line is never hit!!!
super.serialize(bean, jgen, provider);
}
}
I create an object that extends UIElement, the appropriate BSerializer is
created, but never called.
Is this a bug in jackson-dataformat-xml, or I'm doing wrong something?
BR, Zsolt
2017. március 22., szerda 23:21:03 UTC+1 időpontban Tatu Saloranta a
következőt írta:
>
> On Wed, Mar 22, 2017 at 1:31 AM, Zsolt Balanyi <zsolt....@gmail.com
> <javascript:>> wrote:
> > Hi!
> >
> > The tag name can be easily renamed, by
> >
> > if (gen instanceof ToXmlGenerator) {
> > ((ToXmlGenerator)gen).setNextName(new
> > QName(bean.getClass().getSimpleName()));
> > }
> > doNormalSerialization();
>
> Yes, but that does not mean much when it's `jackson-databind` and its
> type handling code which can not call such method
> (it is XML specific and not needed for other formats).
>
> > The only problem is, that I need to serialize all other fields, which I
> dont
> > know how... That is why I would need to get the method to perform the
> > serialization, as the default serializer would.
> > Also, the BeanSerializerModifier approach did not work.
> > The new serializer is only created, but not called during the
> serialization.
> > Maybe it has to something with the fact that I register it for an
> abstract
> > class, and the concrete implementors still use their defaults?
>
> BeanSerializerModifier is a callback, but yes, result would be bound
> for whatever type it was called for.
>
> -+ Tatu +-
>
> >
> > BR Zsolt
> >
> >
> >
> > 2017. március 22., szerda 5:38:56 UTC+1 időpontban Tatu Saloranta a
> > következőt írta:
> >>
> >> On Tue, Mar 21, 2017 at 12:16 AM, Zsolt Balanyi <zsolt....@gmail.com>
> >> wrote:
> >> > Hi!
> >> >
> >> > That was one of my first attempts :)
> >> >
> >> > <Page>
> >> > <uiElement>
> >> > <StackLayout>
> >> > <uiElements>
> >> > <Label text="some text"/>
> >> > </uiElements>
> >> > <uiElements>
> >> > <Image url="mypageUrl"/>
> >> > </uiElements>
> >> > </StackLayout>
> >> > </uiElement>
> >> > </Page>
> >> >
> >> > The question is how could I ommit the uiElement nodes?
> >>
> >> <uiElement> itself matches property `uiElement` so that can not be
> >> removed.
> >> Or, if expectation was that property name would be replaced by type id
> >> that is not something Jackson supports or will be able to support --
> >> it may make sense from XML viewpoint, but would not work with JSON or
> >> any other supported dataformat. XML is bit of an outlier as its
> >> structural model is the most difficult one to support, of formats
> >> supported.
> >>
> >> -+ Tatu +-
> >>
> >> >
> >> > BR, Zsolt
> >> >
> >> > 2017. március 20., hétfő 20:16:38 UTC+1 időpontban Tatu Saloranta a
> >> > következőt írta:
> >> >>
> >> >> Have you tried choice of `JsonTypeInfo.As.WRAPPER_OBJECT`?
> >> >> That does add type id as property-name "wrapper" in JSON, and should
> >> >> work quite similarly with XML.
> >> >> The main problem with XML is often, however, that the root value
> >> >> requires additional extra XML element.
> >> >>
> >> >> -+ Tatu +-
> >> >>
> >> >> On Mon, Mar 20, 2017 at 11:42 AM, Zsolt Balanyi <zsolt....@gmail.com>
>
> >> >> wrote:
> >> >> > Hi!
> >> >> >
> >> >> > public class Page {
> >> >> > public UIElement uiElement;
> >> >> > }
> >> >> >
> >> >> > @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include =
> >> >> > JsonTypeInfo.As.PROPERTY, property = "type")
> >> >> > public abstract class UIElement {
> >> >> > }
> >> >> >
> >> >> > public class StackLayout extends UIElement {
> >> >> > public List<UIElement> uiElements = new ArrayList<>();
> >> >> > }
> >> >> >
> >> >> > public class Label extends UIElement {
> >> >> > @JacksonXmlProperty(isAttribute=true)
> >> >> > public String text;
> >> >> > }
> >> >> >
> >> >> > So basically I have a Page, that contains a StackLayout that
> >> >> > contains
> >> >> > a
> >> >> > Label and an Image.
> >> >> > It would solve the problem, if the JsonTypeInfo could put the type
> >> >> > name
> >> >> > to
> >> >> > the element name...
> >> >> >
> >> >> > BR, Zsolt
> >> >> >
> >> >> > 2017. március 20., hétfő 19:22:10 UTC+1 időpontban Tatu Saloranta
> a
> >> >> > következőt írta:
> >> >> >>
> >> >> >> What is the POJO you are serializing?
> >> >> >>
> >> >> >> -+ Tatu +-
> >> >> >>
> >> >> >>
> >> >> >> On Mon, Mar 20, 2017 at 5:11 AM, Zsolt Balanyi <
> zsolt....@gmail.com>
> >> >> >> wrote:
> >> >> >> > Hi!
> >> >> >> >
> >> >> >> > I have a structure that outputs this:
> >> >> >> >
> >> >> >> > <Page>
> >> >> >> > <uiElement type="StackLayout">
> >> >> >> > <uiElements type="Label" text="some text"/>
> >> >> >> > <uiElements type="Image" url="mypageUrl"/>
> >> >> >> > </uiElement>
> >> >> >> > </Page>
> >> >> >> >
> >> >> >> > I use @JsonTypeInfo(use=JsonTypeInfo.Id.NAME,
> include=As.PROPERTY,
> >> >> >> > property="type") on the common base class.
> >> >> >> > How could I get the following output:
> >> >> >> >
> >> >> >> > <Page>
> >> >> >> > <StackLayout>
> >> >> >> > <Label text="some text"/>
> >> >> >> > <Image url="mypageUrl"/>
> >> >> >> > </StackLayout>
> >> >> >> > </Page>
> >> >> >> >
> >> >> >> > It does not matter, if it can not be deserialized by Jackson,
> it
> >> >> >> > is
> >> >> >> > read
> >> >> >> > by
> >> >> >> > another system, that requires this structure.
> >> >> >> >
> >> >> >> > BR, Zsolt
> >> >> >> >
> >> >> >> > --
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