[XSTR-155] Circular reference seems not to work.

Details

Type: Bug
Status: Closed
Resolution: Won't Fix
Affects Version/s: None
Fix Version/s: None
Component/s: None
Labels:
None

Description

Testcase:
public void testConverter()

{ XStream xstream=new XStream(); xstream.setMode(XStream.ID_REFERENCES); InputStream is=ReferentieObjectConverterTest.class.getClassLoader().getResourceAsStream("Gebruikers.xml"); ReferentieObjectConverter converter=new ReferentieObjectConverter(); converter.setPersister(persister); xstream.registerConverter(converter); String xml = FileUtil.readStream(is); Object obj=xstream.fromXML(xml); System.out.println(obj); }

Gebruikers.xml

<java.util.ArrayList>

<nl.politie.isc.h2o.framework.service.mock.domein.Kind id="nl.politie.isc.h2o.framework.service.mock.domein.Kind_1">
<id>1</id>
<naam>kindnaam </naam>
<moeder reference="nl.politie.isc.h2o.framework.service.mock.domein.Moeder_1"/>
</nl.politie.isc.h2o.framework.service.mock.domein.Kind>

<nl.politie.isc.h2o.framework.service.mock.domein.Moeder id="nl.politie.isc.h2o.framework.service.mock.domein.Moeder_1">
<id>1</id>
<naam>moedernaam </naam>
<kind reference="nl.politie.isc.h2o.framework.service.mock.domein.Kind_1"/>
</nl.politie.isc.h2o.framework.service.mock.domein.Moeder>

</java.util.ArrayList>

In this case the 'Moeder' object has a reference to the 'Kind' object, but the other way arround the reference seems not to work only a null value can be found.

It seems like I can only up in the xml document tree, but not down.

What am I doing wrong. In the document circular reference is mentioned serveral times.

Activity

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Joe Walnes added a comment - 19/Dec/04 4:16 PM

XStream is stream based (rather than document based), meaning it handles deserializes each object as soon as it encounters it in the XML.

This means that whenever a 'reference' is encountered, XStream needs to have already deserialized the object that the reference is pointing to, otherwise it cannot continue.

The XML you posted can be restructured to allow this:

<java.util.ArrayList>

<nl.politie.isc.h2o.framework.service.mock.domein.Kind id="nl.politie.isc.h2o.framework.service.mock.domein.Kind_1">
<id>1</id>
<naam>kindnaam </naam>
<moeder id="nl.politie.isc.h2o.framework.service.mock.domein.Moeder_1">
<id>1</id>
<naam>moedernaam </naam>
<kind reference="nl.politie.isc.h2o.framework.service.mock.domein.Kind_1"/>
</moeder>
</nl.politie.isc.h2o.framework.service.mock.domein.Kind>

<nl.politie.isc.h2o.framework.service.mock.domein.Moeder reference="nl.politie.isc.h2o.framework.service.mock.domein.Moeder_1"/>

</java.util.ArrayList>

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Joe Walnes added a comment - 19/Dec/04 4:16 PM XStream is stream based (rather than document based), meaning it handles deserializes each object as soon as it encounters it in the XML. This means that whenever a 'reference' is encountered, XStream needs to have already deserialized the object that the reference is pointing to, otherwise it cannot continue. The XML you posted can be restructured to allow this: <java.util.ArrayList> <nl.politie.isc.h2o.framework.service.mock.domein.Kind id="nl.politie.isc.h2o.framework.service.mock.domein.Kind_1"> <id>1</id> <naam>kindnaam </naam> <moeder id="nl.politie.isc.h2o.framework.service.mock.domein.Moeder_1"> <id>1</id> <naam>moedernaam </naam> <kind reference="nl.politie.isc.h2o.framework.service.mock.domein.Kind_1"/> </moeder> </nl.politie.isc.h2o.framework.service.mock.domein.Kind> <nl.politie.isc.h2o.framework.service.mock.domein.Moeder reference="nl.politie.isc.h2o.framework.service.mock.domein.Moeder_1"/> </java.util.ArrayList>

People

Assignee:

Unassigned

Reporter:

Pi Chen Lin

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Watchers:

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Dates

Created:

10/Nov/04 4:21 AM

Updated:

19/Dec/04 4:16 PM

Resolved:

19/Dec/04 4:16 PM