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Version 1 by hannes on 18. June 2006, 01:12

Goals:

* Generalize the way request paths are mapped to Objects/Actions.
* Provide a more powerful method of partial/dynamic mapping than getChildElement() in Helma 1.

Non-Goals:

* Break Helma 1 mapping. The new mapping must provide everything needed to implement Helma 1-like request path to HopObject mapping (including getChildElement()).

=== Implementation ===

At the lowest level, Helma 2 will employ pluggable RequestMappers to map incoming requests to objects and actions. For example, a HopObjectRequestMapper will start at the HopObject root element, sequentially get the child element for each path element and try to resolve the last element to an action.

Alternatively, there might be something like a PlainScriptFileRequestMapper that tries to resolve the request path to a JS script file in the server's document root, create a JS object from the script file and invoke an action on it. In fact, this is exactly what the current Helma 2 Subversion snapshot does.

Additionally, RequestMappers may have features to process remaining request path elements in a way *similar to what Ruby on Rails does|http://grazia.helma.at/pipermail/helma-user/2005-November/006145.html*. We probably want a more powerful method than getChildElement() for that purpose.

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