Hi,
On 21.02.2010 15:18, Lukas Lang wrote:
Hey,
it is great to also learn from Castor users, because I didn't know
about that feature until now ;-)
Spring 3 O/X provides a rough code abstraction to keep O/X tools
interchangeable. Of course at the cost of distinctive features, such
as the list-at-root-feature.
From my point of view, I'd either suggest to abandon Spring's
CastorMarshaller and write your own factory bean, or if you depend on
Spring's Marshaller/Unmarshaller interfaces, you could extend
CastorMarshaller and modify it to use your list-at-root Unmarshaller,
which I think could get really messy because Spring uses XmlContext
internally to bootstrap Castor and the only way to use the
list-at-root-feature is to call the Castor Unmarshaller constructor
yourself.
Actually, I'd prefer to have feature requests raised with OXM's
CastorMarshaller class to support more (all) of Castor's features.
Hope that helps.
Regards, Lukas
Am 18.02.2010 um 16:24 schrieb Zachariah Young:
Lukas,
Thanks for your quick reply. I understand what you are say. At
this point I'm trying to avoid creating the parent class.
So I went back and created following example
http://www.castor.org/how-to-map-a-list-at-root.html. This work
prefectly.
But I'm now trying to wire all this up in Spring 3.
Working sample
Mapping mapping1 = new Mapping();
mapping1.loadMapping("mapping1.xml"); FileReader reader1 = new
FileReader("order.xml");
Unmarshaller unmarshaller = new Unmarshaller(ArrayList.class);>--
I think this is the piece I'm missing.
unmarshaller.setMapping(mapping1); ArrayList<OrderItem> orders =
(ArrayList<OrderItem>) unmarshaller.unmarshal(reader1);
Spring sample castorMarshaller is what I'm injecting from my IOC
ArrayList<OrderItem> doc = (ArrayList<OrderItem>)
this.castorMarshaller.unmarshal(new StreamSource(is));
<bean id="castorMarshaller"
class="org.springframework.oxm.castor.CastorMarshaller"> <property
name="mappingLocation" value="classpath:mapping.xml" /> </bean>
Question is how do I set ArrayList for the unmarshal to work?
Thanks for the help
On Thu, Feb 18, 2010 at 12:04 AM, Lukas Lang<[email protected]>
wrote: Hey Zachariah,
there is nothing wrong with the way you are using Castor. The
problem in your case is that the XML specification states the
following:
"There is exactly one element, called the root, or document
element, no part of which appears in the content of any other
element." [1]
This contract is violated by your (generated) XML instance.
The reason why Castor can deal with your Collection and produce
valid XML output is simply because Castor uses a lot of
introspection. It is more complicated the other way round, because
the Unmarshaller on the one hand has no idea how to handle a non
well formed XML instance and on the other hand does not know what
type the client code is expecting as there don't exist any generic
methods in the Castor XML API.
So, back to your problem:
Introduce a parent element and embed your Collection.
<mapping> <class name="Farm" type="com.zandroid.model.Farm"> <field
name="pets" type=""com.zandroid.model.Pet" collection="arraylist">
<bind-xml name="pet"/> </field> ...
Your Farm domain object simply holds a List of Pet elements.
Remember to add accessors (getX/setX)!
If you need further information, please consider the reference
guide[2].
Regards, Lukas
[1] http://www.w3.org/TR/xml/#dt-root [2]
http://castor.codehaus.org/reference/html-single/index.html
Am 18.02.2010 um 05:09 schrieb Zachariah Young:
I'm trying to work through a simple use case for Castor and I'm
getting the following error. What I'm trying to do is read in an
XML file with a list of objects.
Exception in thread "main"
org.exolab.castor.xml.MarshalException: The class for the root
element 'array-list' could not be found.{File: [not available];
line: 2; column: 13}
My simple entity looks like the following.
public class Pet implements Serializable {
private String Name; private String Type;
public void setName(String name) { Name = name; }
public String getName() { return Name; }
public void setType(String type) { this.Type = type; }
public String getType() { return Type; } } My mapping file looks
like this.
<mapping> <class name="com.zandroid.model.Pet"
auto-complete="true"> <map-to xml="pet"/> <field name="name"
type="string"> <bind-xml name="name" node="element"/> </field>
<field name="type" type="string"> <bind-xml name="type"
node="element"/> </field> </class> </mapping>
In my main class I have the follow code.
public static void main(String[] args) throws IOException,
MappingException, MarshalException, ValidationException {
List<Pet> arrayList = new ArrayList<Pet>(); Pet pet = new
Pet(); pet.setName("Zoe"); pet.setType("Dog");
arrayList.add(pet);
Pet pet1 = new Pet(); pet1.setName("Gary"); pet1.setType("Cat");
arrayList.add(pet1);
Writer fileWriter = new FileWriter("text.xml");
Mapping mapping = new Mapping();
mapping.loadMapping("mapping.xml");
XMLContext context = new XMLContext();
context.addMapping(mapping);
Marshaller marshaller = context.createMarshaller();
marshaller.setWriter(fileWriter);
marshaller.marshal(arrayList);
context.createUnmarshaller().setClass(ArrayList.class);
FileReader reader = new FileReader("text.xml");
ArrayList<Pet> pets =
(ArrayList<Pet>)context.createUnmarshaller().unmarshal(reader);
for (Pet pet2 : pets) { System.out.println(pet2.getName()); } }
This code creates the following xml file. <array-list>
<pet><name>Zoe</name><type>Dog</type></pet>
<pet><name>Gary</name><type>Cat</type></pet> </array-list>
So when I go Unmarshaller the XML file I get the The class for
the root element 'array-list'.
1. Should I be doing something different in my mapping file? 2.
Should I create another class that has a property of List<Pet>?
3. Is this the correct use case for Castor?
Note: I'm also trying to get this to work in Spring 3. Also I
have review this article
http://www.castor.org/how-to-map-a-list-at-root.html
Thanks for the help. -- Zachariah Young
http://zachariahyoung.com
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-- Zachariah Young President of NW Arkansas .Net User Group
Co-Founder of Virtual ALT.NET INETA VUG Mentor
http://zachariahyoung.com [email protected] (479) 966-9169
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