[xstream-user] Re: Is there a way to set the order of Xstream serialization

[Ihar Tsimoshka]

I've created this annotation:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface XMLSequence {
    String[] value();
}

This is example of use (write before class definition):
@XMLSequence({
        "accountIds",
        "addresses",
        "birthDate",
        "contact",
        "name",
        "status",
})

Then I've overrided FieldKeySorter :

public class SequenceFieldKeySorter implements FieldKeySorter {
    @Override
    public Map sort(final Class type, final Map keyedByFieldKey) {
        Annotation sequence = type.getAnnotation(XMLSequence.class);
        if (sequence != null) {
            final String[] fieldsOrder = ((XMLSequence) sequence).value();
            Map result = new OrderRetainingMap();
            Set<Map.Entry<FieldKey, Field>> fields = keyedByFieldKey.entrySet();
            for (String fieldName : fieldsOrder) {
                if (fieldName != null) {
                    for (Map.Entry<FieldKey, Field> fieldEntry : fields) {
                        if
(fieldName.equals(fieldEntry.getKey().getFieldName())) {
                            result.put(fieldEntry.getKey(),
fieldEntry.getValue());
                        }
                    }
                }
            }
            return result;
        } else {
            return keyedByFieldKey;
        }

    }
}

And this is how I've instanced XStream:
XStream x = new XStream(new PureJavaReflectionProvider(new
FieldDictionary(new SequenceFieldKeySorter())));


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