RE: Zeus: Data binding and Enhydra Enterprise services

["Christophe Ney" <cney@xxxxxxxxxx>]

Yes it make sense. Comments:

- We might want the marshaler to use another concrete
class implementing Foo instead of FooImpl
- One marshaler is perfect, but will require intensive use of 
the reflection API.
- Are we reading/writing to a stream or a reader/writter?

Christophe

>-----Original Message-----
>From: owner-Zeus@xxxxxxxxxxx [mailto:owner-Zeus@xxxxxxxxxxx]On 
>Behalf Of
>Brett McLaughlin
>Sent: Tuesday, January 16, 2001 2:26 PM
>To: Zeus@xxxxxxxxxxx
>Subject: RE: Zeus: Data binding and Enhydra Enterprise services
>
>
>
>
>> -----Original Message-----
>> From: owner-Zeus@xxxxxxxxxxx 
>[mailto:owner-Zeus@xxxxxxxxxxx]On Behalf Of
>> Christophe Ney
>> Sent: Tuesday, January 16, 2001 4:14 PM
>> To: Zeus@xxxxxxxxxxx
>> Subject: Zeus: Data binding and Enhydra Enterprise services
>>
>>
>> Brett,
>>
>> Do you plan to write a marshaler class that will marshal/unmarshal
>> the Data Object using setter and getter methods?
>
>I had not... one Marshaller class and one Unmarshaller class 
>would be able
>to do all marshalling and unmarshalling, I would think. I'm 
>not sure why you
>would need specific "flavors" like MyDtdMarshaller or 
>MyFooMarshaller. But
>maybe I'm missing something?
>
>However, as for the DTD, I assume you meant:
>
><!ELEMENT foo (description)>
><!ELEMENT description (#PCDATA)>
>
>In that case, you would get:
>
>public interface Foo {
>  public String getDescription();
>  public void setDescription(String description);
>}
>
>public class FooImpl implements Foo {
>  private String description;
>
>  public String getDescription() {
>    return description;
>  }
>
>  public void setDescription(String description) {
>    this.description = description;
>  }
>}
>
>Then, if you had an XML document:
>
><?xml version="1.0"?>
>
><foo>Hello World</foo>
>
>called, say, /usr/local/foo.xml, you could do:
>
>Marshaller marshaller = Marshaller.getInstance();
>Object o = marshaller.marshal(new StreamSource("/usr/local/foo.xml"));
>
>if (o != null) {
>  Foo foo = (Foo)o;
>  String theDescription = foo.getDescription();
>
>  foo.setDescription("See you later");
>  Unmarshaller unmarshaller = Unmarshaller.getInstance();
>  unmarshaller.unmarshal(foo, new StreamResult("/usr/local/foo.xml"));
>}
>
>You would have then written back out:
>
><?xml version="1.0"?>
><foo>See you later</foo>
>
>Make sense? Comments?
>
>-Brett
>
>>
>> This would be very usefull for configuration of EE services.
>> In EE the configuration object must extends TargetAccessPoint which
>> implies that it cannot be generated by the Zeus framework.
>> However, the Zeus framework could generate a Data Object interface
>> and provide a marshaler for it.
>>
>> let say that myDTD contains
>>
>> <!ELEMENT foo (description)>
>> <!ELEMENT a (#PCDATA)>
>>
>> Zeus would generate
>>
>> public interface Foo {
>>   public void setA(String a);
>>   public String getA();
>> }
>>
>> public MyDTDMarshaler {
>>   public void marshal(Reader r, Foo f){...}
>>   public void unmarshal(Writer w, Foo f){...}
>> }
>>
>>
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