On Thursday, Dec 5, 2002, at 08:06 US/Pacific, Christopher Oliver wrote:
I don't have much experience developing with Velocity, however by quickly glancing at the documentation it appears the Velocity class has a setProperty() method which we can make use of to set the individual key-value pairs of the business object dictionary and the continuation object:Ovidiu Predescu wrote:OK. Then we need some way of populating the Velocity context with the argument from sendPage() and the WebContinuation object. What's the best way of doing this? Also the Velocity introspector I wrote for JavaScript requires Velocity 1.4 dev. Is that going to be a problem?Instead of putting in "convenience" features like this I think it would be more valuable to make other view layers (Velocity, JSP's) accessible to the flow layer. If someone familiar with the internals of Cocoon wants to help me out I'd be interested in contributing to this.
I could help you here. You've already done work for Velocity, it's just a matter of integrating them in the current system.
http://jakarta.apache.org/velocity/api/org/apache/velocity/app/ Velocity.html#setProperty(java.lang.String,%20java.lang.Object)
In a pure servlet environment we could use HTTPServletRequest.setAttribute to set named properties, which could then be accessed using normal JSTL expressions.OK. Then I guess I'd have basically the same question here. What's the best way to make the sendPage() argument and continuation object accessible to JSTL?
With respect to JSP, I think we can directly use JSTL which has strikingly similar features as the JPath logicsheet. The only difference is that instead of an XPath notation to access objects, it uses a dotted notation. Other than that the features are very >> similar.
Cocoon however doesn't forward the request to a VelocityServlet or JSP page for initial page processing. Instead it has a Generator wrapper around them, so the mechanisms are a bit different. The control flow itself passes the object dictionary and the continuation object in an Environment object, under the 'bean-dict' and 'kont' keys.
For Velocity, we could modify org.apache.cocoon.generation.VelocityGenerator such that the generate() method looks up in the environment for the objects registered under the above mentioned keys, and merges them in the context passed to the template.
Strangely I couldn't find the JSP support in org.apache.cocoon.generation, although I do remember seeing something like JSPReader. Perhaps somebody else can enlighten us in this area.
Best regards,
Ovidiu
--
Ovidiu Predescu <[EMAIL PROTECTED]>
http://webweavertech.com/ovidiu/weblog/
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