Re: Using business objects instead of XML

Sat, 02 Apr 2005 08:39:30 -0800 

Leszek, and Others,

I have tried the following as well (flow script):

function DomainObject()
{
}
DomainObject.prototype.id;
DomainObject.prototype.name;

function something()
{
    ....

    // Get the request parameters.
    var domainObject = new DomainObject();
    domainObject.name = cocoon.request.getParameter("name");
    domainObject.id = 1000;
    cocoon.sendPage("page", { "DomainObject" : domainObject } );
}

The result of this is

org.apache.cocoon.ProcessingException: Exception during source resolving.: org.apache.excalibur.source.SourceException: The object type: class org.mozilla.javascript.NativeObject could not be serialized as a InputStream [object Object]

If I use one of my own domainObjects, that is, I have now

var domainObject = com.foo.SomeClass.doSomething()

the result is very similar:

org.apache.cocoon.ProcessingException: Exception during source resolving.: org.apache.excalibur.source.SourceException: The object type: class com.foo.DomainObject could not be serialized as a InputStream DomainObject - name: jfifiikss, id: 1000

(The last line is produced by the toString() method of the com.foo.DomainObject class.)

So, the key problem is that objects cannot be serialized as an InputStream for the pipeline, which occurs at

<map:generate src="module:flow-attr:DomainObject" />

in the sitemap.

Anybody any ideas about this? The basic question here is how exactly one can process objects instantiated in a flowscrip by the sitemap?

(Cocoon version 2.1.7)

Thanks,
Andre.

Leszek Gawron wrote: 
Andre Juffer wrote:

Dear List,

I am trying to insert a domain object into the pipiline with control flow following a suggestion given earlier on this list:

http://www.mail-archive.com/[email protected]/msg23293.html

Suppose, I return some object from a domain class instance, like

var domainObject = com.foo.myClass.doSomething();

The domainObject has all the getters available, e.g. getName(), etc, so it acts like a regular bean.

Now, I would like insert this object in the pipeline with

cocoon.sendPage ("page", domainObject);

try:
cocoon.sendPage( "page", { "domainObject" : domainObject } );
If you pass it as you previously did your domain object is the main context. flow-attr:domainObject looks for an object "domainObject" in main context so in fact in your case it queries for /domainObject/domainObject which is incorrect


In the sitemap, I have

<map:match pattern="page">
  <map:generate src="module:flow-attr:domainObject" />
  <map:serialize type="xml" />
</map:match>




(This is just to see how it looks like.)

The result of all this is an error of the form:

org.apache.cocoon.ProcessingException: Exception during source resolving.: org.apache.excalibur.source.SourceException: The attribute: domainObject is empty

This looks obvious to me, since it is probably not clear that the domainObject in facts represents some class, defined in com.foo.myClass. So, I tried to define the DomainObject class in JavaScripy, like

function DomainObject()
{
}
DomainObject.prototype.name;

and populate the object manually before calling cocoon.sendPage. The result is however the same.

I am using cocoon 2.1.7.

Could anyone point out in some detail how exactly I should do this.

Thanks,





--
Andre H. Juffer              | Phone: +358-8-553 1161
The Biocenter and            | Fax: +358-8-553-1141
    the Dep. of Biochemistry | Email: [EMAIL PROTECTED]
University of Oulu, Finland  | WWW: www.biochem.oulu.fi/Biocomputing/

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