11 Feb
2010
11 Feb
'10
9:25 p.m.
Hi,
thanks for uploading. I had some time to take a look. Do you know SIXX?
http://www.mars.dti.ne.jp/~umejava/smalltalk/sixx/index.html
This is also about complete object graph serialization/deserialization and has been ported
to most of the smalltalk dialects. I does not depend on magritte. I used this to transfer
my objects from my squeak deployment into the new gemstone deployment. I can imagine that
you can offer another level of control of the serialization/deserialization process. But
I'm looking for something much more simple.
thanks very much,
Norbert
On 09.02.2010, at 20:00, Jan van de Sandt wrote:
Hello,
I have uploaded the package Magritte-XMLSupport to
http://source.lukas-renggli.ch/magritteaddons. The package has a dependency on XMLParser
from http://www.squeaksource.com/XMLSupport.
I have developed this package using "Magritte for Seaside 3.0". But is also
works with "Magritte for Seaside 2.8", in this case you need to add the the
Grease package from the Seaside 3.0 as an extra dependency.
Have a look at the unit tests to see how to use the package. Note that the API is not yet
stable. I use it to export and import my Magritte domain objects in a readable format.
I'm now working on export & import functionality for Pier using this library, this
could lead to changes/improvements in the package API.
Jan.
On Tue, Feb 9, 2010 at 1:15 PM, Jan van de Sandt <jvdsandt(a)gmail.com> wrote:
Hello,
On Tue, Feb 9, 2010 at 12:23 PM, Norbert Hartl <norbert(a)hartl.name> wrote:
Hi Jan,
that looks great. I really would like to have a look at the code. May I have a few
questions upfront:
Ok, I will upload the code this evening.
- I assume MAXMLTestPerson is the class name of the instance you are serializing. I would
avoid exposing an implementation detail to the outside world. Do you use that information
on parse time? I would expect that you know how to parse the top level object (by service
context etc.). Regarding references the detail about what to parse is in
MAReferenceDescription you are using for e.g. the address. If this is all right you could
go with <Person> and <Address>. This would make it possible to parse the XML
with a subclass of e.g. MAXMLTestPerson
Yes MAXMLTestPerson is the class name. This was the easiest way to serialize instances of
classes that have the same Magritte description. This behaviour is implemented in
MAXMLWriter, a subclass of MAWriter. It can be easily customized by creating your own
subclass of this visitor.
- You inlined the address instance into the person. Is this exchangable? I'm not sure
I'll go for REST but if yes then I would like to do it by reference. Let's say
<adress id="http://my.service.srv/address/12345"> ...
The current implementation inlines the first occurrence of an object and adds an id
attribute. If an object occurs multiple times than a reference to the id is inlined. For
example:
Smalltalk:
personWithFriendsCycle
| bill john carl |
bill := MAXMLTestPerson new
name: 'Bill';
yourself.
john := MAXMLTestPerson new
name: 'John';
yourself.
carl := MAXMLTestPerson new
name: 'Carl';
friends: (OrderedCollection with: bill with: john);
yourself.
bill friends: (OrderedCollection with: john with: carl).
john friends: (OrderedCollection with: bill with: carl).
^carl
XML:
<MAXMLTestPerson id="1">
<name>Carl</name>
<friends>
<OrderedCollection>
<MAXMLTestPerson id="2">
<name>Bill</name>
<friends>
<OrderedCollection>
<MAXMLTestPerson id="3">
<name>John</name>
<friends>
<OrderedCollection>
<MAXMLTestPerson ref="2"/>
<MAXMLTestPerson ref="1"/>
</OrderedCollection>
</friends>
</MAXMLTestPerson>
<MAXMLTestPerson ref="1"/>
</OrderedCollection>
</friends>
</MAXMLTestPerson>
<MAXMLTestPerson ref="3"/>
</OrderedCollection>
</friends>
</MAXMLTestPerson>
- What do you do with the date field in birthday? Is this a fixed format or do you
specify this over magritte?
This is also implemented using the MAXMLWriter visitor and can be easily customized per
description class.
Jan.
On 09.02.2010, at 11:59, Jan van de Sandt wrote:
Hello Norbert,
I have developed some code to serialize object to XML and visa versa using their Magritte
descriptions. It is not completely finished yet but for standard scenario's it works
fine.
Here an example where an instance of MAXMLTestPerson is serialized to XML.
<MAXMLTestPerson>
<name>Bill Gates</name>
<address>
<MAXMLTestAddress>
<city>Amsterdam</city>
<street>Mainstreet</street>
</MAXMLTestAddress>
</address>
<birthDate>1966-10-20</birthDate>
</MAXMLTestPerson>
It can be de-serialized using MAXMLParser:
MAXMLParser parse: self personWithAddressXML readStream.
The serialization process can be customized. I still have to add proper error handling.
My intention was to add it to the Magritte add-ons repository when the error handling was
fully working. If you want I can add it sooner so you can have a look.
Jan.
On Tue, Feb 9, 2010 at 11:22 AM, Norbert Hartl <norbert(a)hartl.name> wrote:
Hi,
at the moment I'm thinking about a new project. The project will need a Web API to
communicate with an iphone. To me it is quite obvious to implement the API part as a
request handler. But when it comes to generation of e.g. XML I'm not sure what is the
best way to do.
Sure, the seaside way to do it is to create my own canvas and every object needs to draw
itself onto the canvas. But then I have magritte and a lot could be done automatically.
Using xpath in the descriptions I could use Pastell to deserialize objects. To produce the
output there could be a similar way. This would be some kind of XML binding then.
I wanted to ask if there is anything already available that could help me on my way or if
there dedicated ideas how to solve this in seaside.
thanks in advance,
Norbert
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--
Jan van de Sandt
gsm: +31 (0)6 3039 5998
_______________________________________________
Magritte, Pier and Related Tools ...
https://www.iam.unibe.ch/mailman/listinfo/smallwiki
_______________________________________________
Magritte, Pier and Related Tools ...
https://www.iam.unibe.ch/mailman/listinfo/smallwiki
--
Jan van de Sandt
gsm: +31 (0)6 3039 5998
--
Jan van de Sandt
gsm: +31 (0)6 3039 5998
_______________________________________________
Magritte, Pier and Related Tools ...
https://www.iam.unibe.ch/mailman/listinfo/smallwiki